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Gevorkyan E, Cepova L, Rucki M, Nerubatskyi V, Morozow D, Zurowski W, Barsamyan V, Kouril K. Activated Sintering of Cr 2O 3-Based Composites by Hot Pressing. MATERIALS (BASEL, SWITZERLAND) 2022; 15:5960. [PMID: 36079341 PMCID: PMC9456671 DOI: 10.3390/ma15175960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 08/03/2022] [Accepted: 08/26/2022] [Indexed: 06/15/2023]
Abstract
The paper presents and discusses questions on structure formation during the sintering process of Cr2O3-based composites using the hot pressing method, when a chemical reaction between the components takes place. The task was difficult because Cr2O3 decomposes when sintered at temperatures above 1300 °C. The proposed novel method allowed for interaction between aluminum and chromia, thus avoiding the decomposition of the latter. Here, ultrafine aluminum powder played the role of the active agent forming a liquid phase and reacting with Cr2O3. The appearance of the solid solutions of (Cr,Al)2O3 with different stoichiometry of Cr and Al depended on the aluminum content in the initial mixture. The solid solution significantly strengthened boundaries between composite phases, resulting in the composite material of high fracture toughness between 5 and 7 MPa m½ and bending strength of ca. 500 MPa. The best mechanical properties exhibited the cermet with 22 wt.% of the restored chromium.
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Affiliation(s)
- Edwin Gevorkyan
- Faculty of Mechanics and Energy, Ukrainian State University of Railway Transport, 7 Feuerbach Sq., 61050 Kharkiv, Ukraine
- Institute of Mechanical Science, Vilnius Gediminas Technical University, J. Basanaviciaus Str. 28, LT-03224 Vilnius, Lithuania
| | - Lenka Cepova
- Faculty of Mechanical Engineering, VSB-Technical University of Ostrava, 17. listopadu 2172/15, 70800 Ostrava Poruba, Czech Republic
| | - Mirosław Rucki
- Institute of Mechanical Science, Vilnius Gediminas Technical University, J. Basanaviciaus Str. 28, LT-03224 Vilnius, Lithuania
| | - Volodymyr Nerubatskyi
- Faculty of Mechanics and Energy, Ukrainian State University of Railway Transport, 7 Feuerbach Sq., 61050 Kharkiv, Ukraine
| | - Dmitrij Morozow
- Faculty of Mechanical Engineering, Kazimierz Pulaski University of Technology and Humanities in Radom, Stasieckiego 54, 26-600 Radom, Poland
| | - Wojciech Zurowski
- Faculty of Mechanical Engineering, Kazimierz Pulaski University of Technology and Humanities in Radom, Stasieckiego 54, 26-600 Radom, Poland
| | - Voskan Barsamyan
- National Polytechnic University of Armenia, Vanadzor 2011, Armenia
| | - Karel Kouril
- Faculty of Mechanical Engineering, Brno University of Technology, Technicka 2896/2, 61669 Brno, Czech Republic
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