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Roman AM, Cimpoeșu R, Pricop B, Cazacu MM, Zegan G, Istrate B, Cocean A, Chelariu R, Moscu M, Bădărău G, Cimpoeșu N, Ivănescu MC. Investigations on the Degradation Behavior of Processed FeMnSi-xCu Shape Memory Alloys. Nanomaterials (Basel) 2024; 14:330. [PMID: 38392703 PMCID: PMC10893035 DOI: 10.3390/nano14040330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2023] [Revised: 01/31/2024] [Accepted: 02/06/2024] [Indexed: 02/24/2024]
Abstract
A new functional Fe-30Mn-5Si-xCu (x = 1.5 and 2 wt%) biomaterial was obtained from the levitation induction melting process and evaluated as a biodegradable material. The degradation characteristics were assessed in vitro using immersion tests in simulated body fluid (SBF) at 37 ± 1 °C, evaluating mass loss, pH variation that occurred in the solution, open circuit potential (OCP), linear and cyclic potentiometry (LP and CP), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and nano-FTIR. To obtain plates as samples, the cast materials were thermo-mechanically processed by hot rolling. Dynamic mechanical analysis (DMA) was employed to evaluate the thermal properties of the smart material. Atomic force microscopy (AFM) was used to show the nanometric and microstructural changes during the hot rolling process and DMA solicitations. The type of corrosion identified was generalized corrosion, and over the first 3-5 days, an increase in mass was observed, caused by the compounds formed at the metal-solution interface. The formed compounds were identified mainly as oxides that passed into the immersion liquid. The degradation rate (DR) was obtained as a function of mass loss, sample surface area and immersion duration. The dynamic mechanical behavior and dimensions of the sample were evaluated after 14 days of immersion. The nanocompounds found on the surface after atmospheric corrosion and immersion in SBF were investigated with the Neaspec system using the nano-FTIR technique.
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Affiliation(s)
- Ana-Maria Roman
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iasi, 41 Dimitrie Mangeron Blvd, 700050 Iasi, Romania; (A.-M.R.); (R.C.); (B.P.); (R.C.); (G.B.)
| | - Ramona Cimpoeșu
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iasi, 41 Dimitrie Mangeron Blvd, 700050 Iasi, Romania; (A.-M.R.); (R.C.); (B.P.); (R.C.); (G.B.)
| | - Bogdan Pricop
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iasi, 41 Dimitrie Mangeron Blvd, 700050 Iasi, Romania; (A.-M.R.); (R.C.); (B.P.); (R.C.); (G.B.)
| | - Marius Mihai Cazacu
- Physics Department, “Gheorghe Asachi” Technical University of Iasi, 59A Dimitrie Mangeron Blvd, 700050 Iasi, Romania;
| | - Georgeta Zegan
- Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 16 University Street, 700115 Iasi, Romania; (M.M.); (M.C.I.)
| | - Bogdan Istrate
- Faculty of Mechanical Engineering, “Gheorghe Asachi” Technical University of Iasi, 43 Dimitrie Mangeron Blvd, 700050 Iasi, Romania;
| | - Alexandru Cocean
- Atmosphere Optics, Spectroscopy and Laser Laboratory (LOASL), Faculty of Physics, Alexandru Ioan Cuza University, 11 Carol I Blvd, 700506 Iasi, Romania;
- Laboratory of Applied Meteorology and Climatology, A Building, Physics, Research Center with Integrated Techniques for Atmospheric Aerosol Investigation in Romania (RECENT AIR), Alexandru Ioan Cuza University of Iasi, 11 Carol I, 700506 Iasi, Romania
| | - Romeu Chelariu
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iasi, 41 Dimitrie Mangeron Blvd, 700050 Iasi, Romania; (A.-M.R.); (R.C.); (B.P.); (R.C.); (G.B.)
| | - Mihaela Moscu
- Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 16 University Street, 700115 Iasi, Romania; (M.M.); (M.C.I.)
| | - Gheorghe Bădărău
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iasi, 41 Dimitrie Mangeron Blvd, 700050 Iasi, Romania; (A.-M.R.); (R.C.); (B.P.); (R.C.); (G.B.)
| | - Nicanor Cimpoeșu
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iasi, 41 Dimitrie Mangeron Blvd, 700050 Iasi, Romania; (A.-M.R.); (R.C.); (B.P.); (R.C.); (G.B.)
| | - Mircea Cătălin Ivănescu
- Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 16 University Street, 700115 Iasi, Romania; (M.M.); (M.C.I.)
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Antohe ME, Dascălu CG, Forna DA, Hitruc EG, Cimpoeșu N, Forna NC. Research on the Quality of Partially Removable Skeletal Prostheses Made Using Classical Versus Modern Sintering Techniques. Biomedicines 2023; 11:2397. [PMID: 37760838 PMCID: PMC10525243 DOI: 10.3390/biomedicines11092397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 08/22/2023] [Accepted: 08/24/2023] [Indexed: 09/29/2023] Open
Abstract
Conventional partially removable skeletal dentures are one of the most common therapeutic solutions offered to edentulous patients worldwide. The present study aims to compare the skeleton of removable dentures realized via classical techniques to that realized via modern techniques, represented by the laser sintering technique, with the comparative aspects being realized through the evaluation of atomic force microscopy (AFM). A total of 20 metal frameworks made of Co-Cr were sectioned, representing the infrastructure of partially removable skeletal dentures, developed using the classical technique versus the laser sintering technique. The infrastructures of partially removable skeletal dentures were designed for both the maxilla and the mandible, with the design of each type of denture being identical, and were developed using both techniques. The roughness values are different depending on the technological method used; for the conventional casting technique, we have higher roughness for the component elements of the partially removable skeletal denture that have more stretch, e.g., the major connector, and for the 3D laser sintering technique, lower roughness is obtained for the component elements that have a lower stretch, e.g., the clasp arms, the minor connector, or the junction between the saddles and the major connector. The clinical implications of the presence of roughness at the level of the active arms or at the level of the connector saddle junction are represented by the risk of fracture, which confers real discomfort to the patient.
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Affiliation(s)
- Magda-Ecaterina Antohe
- 3rd Dental Medicine Department, Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 700115 Iasi, Romania; (M.-E.A.); (N.C.F.)
| | - Cristina Gena Dascălu
- Department of Medical Informatics, “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universității Street, 700115 Iasi, Romania
| | - Doriana Agop Forna
- 1st Dental Medicine Department, Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universității Street, 700115 Iasi, Romania
| | - Elena Gabriela Hitruc
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica-Vodă, 41A, 700487 Iasi, Romania;
| | - Nicanor Cimpoeșu
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University, Bulevardul Profesor Dimitrie Mangeron 67, 700050 Iasi, Romania;
| | - Norina Consuela Forna
- 3rd Dental Medicine Department, Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 700115 Iasi, Romania; (M.-E.A.); (N.C.F.)
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Vâlcea AE, Mariș I, Negrea AD, Cimpoeșu N, Gârbea G, Grecu D, Moga SG, Istrate B, Finta FN, Rizea AD, Anghel DC, Munteanu C, Petrescu MI, Abrudeanu M. Interdisciplinary Research on Medieval Fresco Subjected to Degradation Processes in the Corbii de Piatră Cave Church. Materials (Basel) 2023; 16:5257. [PMID: 37569960 PMCID: PMC10420289 DOI: 10.3390/ma16155257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 07/12/2023] [Accepted: 07/20/2023] [Indexed: 08/13/2023]
Abstract
This paper presents research on the degradation processes of the fresco painting in the cave church of Corbii de Piatră Hermitage under the influence of meteoric infiltration water and environmental factors. The medieval fresco dates from the end of the 13th century and the beginning of the 14th century, being painted on a sandstone wall. The infiltration of meteoric water through this wall, the temperature variations, the environment and the repeated wetting/drying processes determined the degradation of the fresco, resulting in its detachment from large surfaces. This research established correlations between the processes that take place, the structural transformations, the changes in composition and the adhesion of the fresco to the sandstone wall. The results have been made available to conservation and restoration specialists, in order to choose appropriate materials and technologies. This paper presents findings regarding the pictorial material and introduces new analysis techniques in research on the degradation processes of the fresco painting in the cave church of Corbii de Piatră Hermitage under the influence of meteoric infiltration water and environmental factors.
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Affiliation(s)
- Adriana Elena Vâlcea
- Interdisciplinary Doctoral School, University of Pitesti, Str. Targu din Vale Nr. 1, 110040 Pitesti, Romania; (A.E.V.); (F.N.F.)
| | - Izabela Mariș
- Department of Mineralogy, Faculty of Geology and Geophysics, University of Bucharest, 1 N. Bălcescu Ave., 011401 Bucharest, Romania;
| | - Aurelian Denis Negrea
- Regional Center of Research & Development for Materials, Processes and Innovative Products Dedicated to the Automotive Industry (CRC&D-AUTO), University of Pitesti, Str. Targu din Vale Nr. 1, 110040 Pitesti, Romania; (A.D.N.); (S.G.M.)
| | - Nicanor Cimpoeșu
- Department of Materials Science, Gheorghe Asachi Technical University of Iași, Bd. Dimitrie Mangeron, nr. 67, 700050 Iaşi, Romania;
| | - Gheorghe Gârbea
- Faculty of Theology, Letters, History and Arts, University of Pitesti, Str. Targu din Vale Nr. 1, 110040 Pitesti, Romania; (G.G.); (D.G.)
| | - Dorin Grecu
- Faculty of Theology, Letters, History and Arts, University of Pitesti, Str. Targu din Vale Nr. 1, 110040 Pitesti, Romania; (G.G.); (D.G.)
| | - Sorin Georgian Moga
- Regional Center of Research & Development for Materials, Processes and Innovative Products Dedicated to the Automotive Industry (CRC&D-AUTO), University of Pitesti, Str. Targu din Vale Nr. 1, 110040 Pitesti, Romania; (A.D.N.); (S.G.M.)
| | - Bogdan Istrate
- Mecatronics and Robotics Department, Faculty of Mechanical Engineering—Mechanical Engineering, Gheorghe Asachi Technical University of Iași, Bd. Dimitrie Mangeron, nr. 67, 700050 Iaşi, Romania;
| | - Flavio Nicolae Finta
- Interdisciplinary Doctoral School, University of Pitesti, Str. Targu din Vale Nr. 1, 110040 Pitesti, Romania; (A.E.V.); (F.N.F.)
| | - Alin Daniel Rizea
- Department of Manufacturing and Industrial Management, University of Pitesti, 1 Târgul din Vale Street, 110040 Pitesti, Romania; (A.D.R.); (D.-C.A.)
| | - Daniel-Constantin Anghel
- Department of Manufacturing and Industrial Management, University of Pitesti, 1 Târgul din Vale Street, 110040 Pitesti, Romania; (A.D.R.); (D.-C.A.)
| | - Corneliu Munteanu
- Mecatronics and Robotics Department, Faculty of Mechanical Engineering—Mechanical Engineering, Gheorghe Asachi Technical University of Iași, Bd. Dimitrie Mangeron, nr. 67, 700050 Iaşi, Romania;
- Technical Sciences Academy of Romania, Calea Victoriei, nr. 118, Sector 1, 010093 Bucuresti, Romania
| | - Mircea Ionuț Petrescu
- Department of Engineering and Management of Metallic Materials Casting, Politehnica University of Bucarest, Splaiul Independentei, 313, Sector 6, 060042 Bucureşti, Romania;
| | - Mărioara Abrudeanu
- Interdisciplinary Doctoral School, University of Pitesti, Str. Targu din Vale Nr. 1, 110040 Pitesti, Romania; (A.E.V.); (F.N.F.)
- Technical Sciences Academy of Romania, Calea Victoriei, nr. 118, Sector 1, 010093 Bucuresti, Romania
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Roman AM, Cimpoeșu R, Pricop B, Lohan NM, Cazacu MM, Bujoreanu LG, Panaghie C, Zegan G, Cimpoeșu N, Murariu AM. Influence of Dynamic Strain Sweep on the Degradation Behavior of FeMnSi-Ag Shape Memory Alloys. J Funct Biomater 2023; 14:377. [PMID: 37504873 PMCID: PMC10381450 DOI: 10.3390/jfb14070377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 07/09/2023] [Accepted: 07/14/2023] [Indexed: 07/29/2023] Open
Abstract
Iron-based SMAs can be used in the medical field for both their shape memory effect (SME) and biodegradability after a specific period, solving complicated chirurgical problems that are partially now addressed with shape-memory polymers or biodegradable polymers. Iron-based materials with (28-32 wt %) Mn and (4-6 wt %) Si with the addition of 1 and 2 wt % Ag were obtained using levitation induction melting equipment. Addition of silver to the FeMnSi alloy was proposed in order to enhance its antiseptic property. Structural and chemical composition analyses of the newly obtained alloys were performed by X-ray diffraction (confirming the presence of ε phase), scanning electron microscopy (SEM) and energy-dispersive spectroscopy. The corrosion resistance was evaluated through immersion tests and electrolyte pH solution variation. Dynamic mechanical solicitations were performed with amplitude sweep performed on the FeMnSi-1Ag and FeMnSi-2Ag samples, including five deformation cycles at 40 °C, with a frequency of 1 Hz, 5 Hz and 20 Hz. These experiments were meant to simulate the usual behavior of some metallic implants subjected to repetitive mechanical loading. Atomic force microscopy was used to analyze the surface roughness before and after the dynamic mechanical analysis test followed by the characterization of the surface profile change by varying dynamic mechanical stress. Differential scanning calorimetry was performed in order to analyze the thermal behavior of the material in the range of -50-+200 °C. X-ray diffraction and Fourier transform infrared spectroscopy (FTIR) along with Neaspec nano-FTIR experiments were performed to identify and confirm the corrosion compounds (oxides, hydroxides or carbonates) formed on the surface.
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Affiliation(s)
- Ana-Maria Roman
- Faculty of Materials Science and Engineering, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania
| | - Ramona Cimpoeșu
- Faculty of Materials Science and Engineering, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania
| | - Bogdan Pricop
- Faculty of Materials Science and Engineering, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania
| | - Nicoleta-Monica Lohan
- Faculty of Materials Science and Engineering, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania
| | - Marius Mihai Cazacu
- Physics Department, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania
| | - Leandru-Gheorghe Bujoreanu
- Faculty of Materials Science and Engineering, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania
| | - Cătălin Panaghie
- Faculty of Materials Science and Engineering, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania
| | - Georgeta Zegan
- Faculty of Dental Medicine, "Grigore T. Popa" University of Medicine and Pharmacy University, 16 University Street, 700115 Iasi, Romania
| | - Nicanor Cimpoeșu
- Faculty of Materials Science and Engineering, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania
| | - Alice Mirela Murariu
- Department of Surgicals, Faculty of Dental Medicine, "Grigore T. Popa" University of Medicine and Pharmacy, 16 University Street, 700115 Iasi, Romania
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Sava ȘD, Lohan NM, Pricop B, Popa M, Cimpoeșu N, Comăneci RI, Bujoreanu LG. On the Thermomechanical Behavior of 3D-Printed Specimens of Shape Memory R-PETG. Polymers (Basel) 2023; 15:polym15102378. [PMID: 37242954 DOI: 10.3390/polym15102378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 05/12/2023] [Accepted: 05/17/2023] [Indexed: 05/28/2023] Open
Abstract
From commercial pellets of recycled polyethylene terephthalate glycol (R-PETG), 1.75 mm diameter filaments for 3D printing were produced. By varying the filament's deposition direction between 10° and 40° to the transversal axis, parallelepiped specimens were fabricated by additive manufacturing. When bent at room temperature (RT), both the filaments and the 3D-printed specimens recovered their shape during heating, either without any constraint or while lifting a load over a certain distance. In this way, free-recovery and work-generating shape memory effects (SMEs) were developed. The former could be repeated without any visible fatigue marks for as much as 20 heating (to 90 °C)-RT cooling-bending cycles, while the latter enabled the lifting of loads over 50 times heavier than the active specimens. Tensile static failure tests revealed the superiority of the specimens printed at larger angles over those printed at 10°, since the specimens printed at 40° had tensile failure stresses and strains over 35 MPa and 8.5%, respectively. Scanning electron microscopy (SEM) fractographs displayed the structure of the successively deposited layers and a shredding tendency enhanced by the increase in the deposition angle. Differential scanning calorimetry (DSC) analysis enabled the identification of the glass transition between 67.5 and 77.3 °C, which might explain the occurrence of SMEs in both the filament and 3D-printed specimens. Dynamic mechanical analysis (DMA) emphasized a local increase in storage modulus of 0.87-1.66 GPa that occurred during heating, which might explain the development of work-generating SME in both filament and 3D-printed specimens. These properties recommend 3D-printed parts made of R-PETG as active elements in low-price lightweight actuators operating between RT and 63 °C.
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Affiliation(s)
- Ștefan-Dumitru Sava
- Faculty of Materials Science, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iasi, Romania
| | - Nicoleta-Monica Lohan
- Faculty of Materials Science, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iasi, Romania
| | - Bogdan Pricop
- Faculty of Materials Science, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iasi, Romania
| | - Mihai Popa
- Faculty of Materials Science, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iasi, Romania
| | - Nicanor Cimpoeșu
- Faculty of Materials Science, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iasi, Romania
| | - Radu-Ioachim Comăneci
- Faculty of Materials Science, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iasi, Romania
| | - Leandru-Gheorghe Bujoreanu
- Faculty of Materials Science, "Gheorghe Asachi" Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iasi, Romania
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Panaghie C, Zegan G, Sodor A, Cimpoeșu N, Lohan NM, Istrate B, Roman AM, Ioanid N. Analysis of Degradation Products of Biodegradable ZnMgY Alloy. Materials (Basel) 2023; 16:3092. [PMID: 37109928 PMCID: PMC10146815 DOI: 10.3390/ma16083092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Revised: 04/06/2023] [Accepted: 04/12/2023] [Indexed: 06/19/2023]
Abstract
Biodegradable metallic materials are increasingly gaining ground in medical applications. Zn-based alloys show a degradation rate between those recorded for Mg-based materials with the fastest degradation rate and Fe-based materials with the slowest degradation rate. From the perspective of medical complications, it is essential to understand the size and nature of the degradation products developed from biodegradable materials, as well as the stage at which these residues are eliminated from the body. This paper presents investigations conducted on the corrosion/degradation products of an experimental material (ZnMgY alloy in cast and homogenized state) after immersion tests in three physiological solutions (Dulbecco's, Ringer's and simulated body fluid (SBF)). Scanning electron microscopy (SEM) was used to highlight the macroscopic and microscopic aspects of corrosion products and their effects on the surface. An X-ray energy dispersive detector (EDS), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) provided general information about the compounds based on their non-metallic character. The pH of the electrolyte solution was recorded for 72 h during immersion. The pH variation of the solution confirmed the main reactions proposed for the corrosion of ZnMg. The agglomerations of corrosion products were on the micrometer scale, mainly oxides, hydroxides and carbonates or phosphates. The corrosion effects on the surface were homogeneously spread, with a tendency to connect and form cracks or larger corrosion zones, transforming the pitting corrosion pattern into a generalized one. It was noticed that the alloy's microstructure strongly influences the corrosion characteristics.
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Affiliation(s)
- Cătălin Panaghie
- Faculty of Materials Science and Engineering, “Gh. Asachi” Technical University from Iasi, 700050 Iasi, Romania
| | - Georgeta Zegan
- Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 700115 Iasi, Romania
| | - Alina Sodor
- Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 700115 Iasi, Romania
| | - Nicanor Cimpoeșu
- Faculty of Materials Science and Engineering, “Gh. Asachi” Technical University from Iasi, 700050 Iasi, Romania
| | - Nicoleta-Monica Lohan
- Faculty of Materials Science and Engineering, “Gh. Asachi” Technical University from Iasi, 700050 Iasi, Romania
| | - Bogdan Istrate
- Faculty of Mechanics, “Gh. Asachi” Technical University from Iasi, 700050 Iasi, Romania
| | - Ana-Maria Roman
- Faculty of Materials Science and Engineering, “Gh. Asachi” Technical University from Iasi, 700050 Iasi, Romania
| | - Nicoleta Ioanid
- Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 700115 Iasi, Romania
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Popa M, Popa F, Pricop B, Cimpoeșu N, Lohan NM, Kicsi G, Istrate B, Bujoreanu LG. Heat Treatment and Dynamic Mechanical Analysis Strain Sweep Effects on the Phase Structure and Morphology of an Fe-28Mn-6Si-5Cr Shape Memory Alloy. Nanomaterials (Basel) 2023; 13:1250. [PMID: 37049343 PMCID: PMC10096908 DOI: 10.3390/nano13071250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 03/28/2023] [Accepted: 03/30/2023] [Indexed: 06/19/2023]
Abstract
Fe-Mn-Si-based shape memory alloys (SMAs) have been extensively investigated since 1982 for various useful properties that enhance the development of different applications such as anti-seismic dampers for very tall buildings, pipe joints, or rail fasteners. In particular, the Fe-28Mn-6Si-5Cr (mass. %) alloy has been mainly used in vibration mitigation or self-adjustable axial displacement applications. Dynamic mechanical analysis (DMA), performed by strain sweeps (SS), enables the monitoring of the evolution of storage modulus and internal friction variations with increasing strain amplitudes at different constant frequencies and temperatures. Thus, applying dynamic bending with various frequencies and amplitudes that actually represents an isothermal mechanical treatment. In the present paper, an Fe-28Mn-6 Si-5Cr (mass. %) SMA was cast by ingot metallurgy, hot-rolled, and water quenched in order to obtain thermally induced martensite and avoid the occurrence of cooling cracks. The influence of the holding time, between 2 and 10 h, at 1050 °C and the effects of DMA-SS performed at three different frequencies were analyzed by a differential scanning calorimetry, an X-ray diffraction, and a scanning electron and atomic force microscopy. The effects of the holding time and mechanical treatment on the structure and morphology of martensite plates were corroborated with the results of the thermal analysis.
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Affiliation(s)
- Mihai Popa
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania (B.P.)
| | - Florin Popa
- Faculty of Materials and Environmental Engineering, Technical University from Cluj-Napoca, Blvd. Muncii, No. 103-105, 400641 Cluj-Napoca, Romania
| | - Bogdan Pricop
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania (B.P.)
| | - Nicanor Cimpoeșu
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania (B.P.)
| | - Nicoleta-Monica Lohan
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania (B.P.)
| | - Gabriel Kicsi
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania (B.P.)
| | - Bogdan Istrate
- Faculty of Mechanical Engineering, “Gheorghe Asachi” Technical University of Iasi-Romania, Blvd. Dimitrie Mangeron, No. 61-63, 700050 Iași, Romania
| | - Leandru-Gheorghe Bujoreanu
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania (B.P.)
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Iovan A, Benchea M, Stoleriu S, Tărăboanță I, Cimpoeșu N, Nica I, Andrian S. Effects of Acidic Challenge on Demineralized Root Surface Treated with Silver Diamine Fluoride and Potassium Iodide. Diagnostics (Basel) 2023; 13:diagnostics13030530. [PMID: 36766635 PMCID: PMC9914569 DOI: 10.3390/diagnostics13030530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Revised: 01/26/2023] [Accepted: 01/29/2023] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND The aim of the study was to assess the protective effect of applying potassium iodide (KI) over silver diamine fluoride (SDF) on demineralized root dentin in the case of a sustained acidogenic attack. METHODS Forty caries-free third molars were used in the study. A diamond disc was used to separate the roots and the tooth crowns from the roots. Each root fragment was randomly distributed in one of the four study groups: C-samples were not demineralized; DD-demineralized samples; RS1-demineralized samples covered with SDF+KI (RS-Riva Star product, SDI limited, Bayswater, Australia); RS2-demineralized samples covered with SDF+KI and submersed to another acidic challenge for 3 days. SEM and EDX were used for the morphological and elemental analysis. Vickers hardness assessment was performed using a tribometer CETR UMT-2 (Bruker Corporation, Berlin, Germany). One-way ANOVA and post hoc Bonferroni tests were used for the statistical analysis with a significance level of p < 0.05. RESULTS Morphological and elemental changes were observed on the surface of the study samples. Significant differences were observed between the recorded hardness values of groups C and DD (p = 0.005), C and RS2 (p = 0.002), DD and RS1 (p = 0.011); RS1 and RS2 (p = 0.004). CONCLUSIONS The application of SDF and KI (Riva Star product) on root dentin caries resulted in the formation of a heterogeneous outer layer that sealed the dentin and increased the microhardness of the treated surface. In the conditions of the present study, this layer did not provide enough protection for root dentin exposed to continuous attacks.
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Affiliation(s)
- Alexandru Iovan
- Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universitatii Str., 700115 Iași, Romania
| | - Marcelin Benchea
- Faculty of Mechanical Engineering, “Gh. Asachi” Technical University, 67 Dimitrie Mangeron Str., 700050 Iași, Romania
- Correspondence: (M.B.); (S.S.)
| | - Simona Stoleriu
- Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universitatii Str., 700115 Iași, Romania
- Correspondence: (M.B.); (S.S.)
| | - Ionuț Tărăboanță
- Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universitatii Str., 700115 Iași, Romania
| | - Nicanor Cimpoeșu
- Faculty of Materials Science and Engineering, “Gh. Asachi” Technical University, 67 Dimitrie Mangeron Str., 700050 Iași, Romania
| | - Irina Nica
- Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universitatii Str., 700115 Iași, Romania
| | - Sorin Andrian
- Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universitatii Str., 700115 Iași, Romania
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Bejinariu C, Paleu V, Stamate CV, Cimpoeșu R, Coteață M, Bădărău G, Axinte M, Istrate B, Vasilescu GD, Cimpoeșu N. Microstructural, Corrosion Resistance, and Tribological Properties of Al 2O 3 Coatings Prepared by Atmospheric Plasma Spraying. Materials (Basel) 2022; 15:9013. [PMID: 36556819 PMCID: PMC9853329 DOI: 10.3390/ma15249013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 12/13/2022] [Accepted: 12/14/2022] [Indexed: 06/17/2023]
Abstract
An usual material, EN-GJL-250 cast iron, used for automotive braking systems, was covered with a ceramic material (105NS-1 aluminium oxide) using an industrial deposition system (Sulzer Metco). The main reason was to improve the corrosion and wear (friction) resistance properties of the cast-iron. Samples were prepared by mechanical grinding and sandblasting before the deposition. We applied two and four passes (around 12-15 µm by layer) each at 90° obtaining ceramic coatings of 30 respectively 60 µm. The surface of the samples (with ceramic coatings) was investigated using scanning electron microscopy (SEM), dispersive energy spectroscopy (EDS) and X-ray diffraction (XRD). Scratch and micro-hardness tests were performed using CETR-UMT-2 micro-tribometer equipment. The better corrosion resistance of the base material was obtained by applying the ceramic coating. The results present a better corrosion resistance and a higher coefficient of friction of the coated samples.
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Affiliation(s)
- Costică Bejinariu
- Materials Science and Engineering Faculty, Gheorghe Asachi Technical University of Iasi, 700050 Iasi, Romania
| | - Viorel Paleu
- Mechanical Engineering, Mechatronics and Robotics Department, Mechanical Engineering Faculty, Gheorghe Asachi Technical University of Iasi, 700050 Iași, Romania
| | - Ciprian Vasile Stamate
- Mechanical Engineering, Mechatronics and Robotics Department, Mechanical Engineering Faculty, Gheorghe Asachi Technical University of Iasi, 700050 Iași, Romania
| | - Ramona Cimpoeșu
- Materials Science and Engineering Faculty, Gheorghe Asachi Technical University of Iasi, 700050 Iasi, Romania
| | - Margareta Coteață
- Faculty of Machine Manufacturing and Industrial Management, Gheorghe Asachi Technical University of Iasi, 700050 Iasi, Romania
| | - Gheorghe Bădărău
- Materials Science and Engineering Faculty, Gheorghe Asachi Technical University of Iasi, 700050 Iasi, Romania
| | - Mihai Axinte
- Materials Science and Engineering Faculty, Gheorghe Asachi Technical University of Iasi, 700050 Iasi, Romania
| | - Bogdan Istrate
- Mechanical Engineering, Mechatronics and Robotics Department, Mechanical Engineering Faculty, Gheorghe Asachi Technical University of Iasi, 700050 Iași, Romania
| | - Gabriel Dragos Vasilescu
- “INSEMEX” National Institute for Research and Development in Mine Safety and Protection to Explosion, 332029 Petrosani, Romania
| | - Nicanor Cimpoeșu
- Materials Science and Engineering Faculty, Gheorghe Asachi Technical University of Iasi, 700050 Iasi, Romania
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Popa M, Lohan NM, Pricop B, Cimpoeșu N, Porcescu M, Comăneci RI, Cazacu M, Borza F, Bujoreanu LG. Structural-Functional Changes in a Ti 50Ni 45Cu 5 Alloy Caused by Training Procedures Based on Free-Recovery and Work-Generating Shape Memory Effect. Nanomaterials (Basel) 2022; 12:nano12122088. [PMID: 35745427 PMCID: PMC9228680 DOI: 10.3390/nano12122088] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/10/2022] [Accepted: 06/14/2022] [Indexed: 12/10/2022]
Abstract
Active elements made of Ti50Ni45Cu5 shape memory alloy (SMA) were martensitic at room temperature (RT) after hot rolling with instant water quenching. These pristine specimens were subjected to two thermomechanical training procedures consisting of (i) free recovery shape memory effect (FR-SME) and (ii) work generating shape memory effect (WG-SME) under constant stress as well as dynamic bending and RT static tensile testing (TENS). The structural-functional changes, caused by the two training procedures as well as TENS were investigated by various experimental techniques, including differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), X-ray diffraction (XRD), and atomic force microscopy (AFM). Fragments cut from the active regions of trained specimens or from the elongated gauges of TENS specimens were analyzed by DSC, XRD, and AFM. The DSC thermograms revealed the shift in critical transformation temperatures and a diminution in specific absorbed enthalpy as an effect of training cycles. The DMA thermograms of pristine specimens emphasized a change of storage modulus variation during heating after the application of isothermal dynamical bending at RT. The XRD patterns and AMF micrographs disclosed the different evolution of martensite plate variants as an effect of FR-SME cycling and of being elongated upon convex surfaces or compressed upon concave surfaces of bent specimens. For illustrative reasons, the evolution of unit cell parameters of B19′ martensite, as a function of the number of cycles of FR-SME training, upon concave regions was discussed. AFM micrographs emphasized wider and shallower martensite plates on the convex region as compared to the concave one. With increasing the number of FR-SME training cycles, plates’ heights decreased by 84–87%. The results suggest that FR-SME training caused marked decreases in martensite plate dimensions, which engendered a decrease in specific absorbed enthalpy during martensite reversion.
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Affiliation(s)
- Mihai Popa
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania; (M.P.); (N.-M.L.); (B.P.); (N.C.); (R.I.C.)
| | - Nicoleta-Monica Lohan
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania; (M.P.); (N.-M.L.); (B.P.); (N.C.); (R.I.C.)
| | - Bogdan Pricop
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania; (M.P.); (N.-M.L.); (B.P.); (N.C.); (R.I.C.)
| | - Nicanor Cimpoeșu
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania; (M.P.); (N.-M.L.); (B.P.); (N.C.); (R.I.C.)
| | - Marieta Porcescu
- National Institute of Research and Development for Technical Physics, Blvd. Dimitrie Mangeron 47, 700050 Iași, Romania; (M.P.); (F.B.)
| | - Radu Ioachim Comăneci
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania; (M.P.); (N.-M.L.); (B.P.); (N.C.); (R.I.C.)
| | - Maria Cazacu
- Department of Inorganic Polymers, “Petru Poni” Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iași, Romania;
| | - Firuța Borza
- National Institute of Research and Development for Technical Physics, Blvd. Dimitrie Mangeron 47, 700050 Iași, Romania; (M.P.); (F.B.)
| | - Leandru-Gheorghe Bujoreanu
- Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iași, Blvd. Dimitrie Mangeron 71A, 700050 Iași, Romania; (M.P.); (N.-M.L.); (B.P.); (N.C.); (R.I.C.)
- Correspondence:
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Șerbănoiu AA, Grădinaru CM, Cimpoeșu N, Filipeanu D, Șerbănoiu BV, Cherecheș NC. Study of an Ecological Cement-Based Composite with a Sustainable Raw Material, Sunflower Stalk Ash. Materials (Basel) 2021; 14:ma14237177. [PMID: 34885330 PMCID: PMC8658183 DOI: 10.3390/ma14237177] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 11/21/2021] [Accepted: 11/23/2021] [Indexed: 11/16/2022]
Abstract
The use of plant ash as a sustainable cementitious material in concrete composition is a widely researched subject in the construction domain. A plant studied so far more for its thermal insulation properties, sunflower, was analyzed in this study with regard to its ash effects on the concrete composition. The present research aimed to analyze the effects of a 2.5%, 5%, 7.5%, 10%, 15%, 20%, or 30% volume replacement of cement by sunflower stalk ash (SA), a sustainable cementitious material, on the concrete compressive strength at 28 days and three months, the flexural and splitting tensile strengths, the resistance to repeated freeze-thaw cycles, and the resistance to chemical attack of hydrochloric acid. The elementary chemical composition of the SA and the composites was included also. According to the experimental results, SA decreased the values of the compressive and tensile strength of the concrete, but it improved the concrete behavior under repeated freeze-thaw cycles and under the action of hydrochloric acid. A percent of 10% of SA led to a much more pronounced development of compressive strength over time than conventional concrete (26.6% versus 12%).
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Affiliation(s)
- Adrian Alexandru Șerbănoiu
- Faculty of Civil Engineering and Building Services, “Gheorghe Asachi” Technical University of Iași, 700050 Iași, Romania; (A.A.Ș.); (D.F.); (N.C.C.)
| | - Cătălina Mihaela Grădinaru
- Faculty of Civil Engineering and Building Services, “Gheorghe Asachi” Technical University of Iași, 700050 Iași, Romania; (A.A.Ș.); (D.F.); (N.C.C.)
- Correspondence:
| | - Nicanor Cimpoeșu
- Faculty of Material Science and Engineering, “Gheorghe Asachi” Technical University of Iași, 700050 Iași, Romania;
| | - Dumitru Filipeanu
- Faculty of Civil Engineering and Building Services, “Gheorghe Asachi” Technical University of Iași, 700050 Iași, Romania; (A.A.Ș.); (D.F.); (N.C.C.)
| | - Bogdan Vasile Șerbănoiu
- Faculty of Architecture “G.M. Cantacuzino”, “Gheorghe Asachi” Technical University of Iași, 700050 Iași, Romania;
| | - Nelu Cristian Cherecheș
- Faculty of Civil Engineering and Building Services, “Gheorghe Asachi” Technical University of Iași, 700050 Iași, Romania; (A.A.Ș.); (D.F.); (N.C.C.)
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