|
1
|
Li Y, Zhao X, Zhai P, Fan P, Xu J, Xu Y, Yu Z, Li M, Zhang Y, Gao D, Liu S, Cai Z, Xiao L. A Novel Superhard, Wear-Resistant, and Highly Conductive Cu-MoSi 2 Coating Fabricated by High-Speed Laser Cladding Technique. MATERIALS (BASEL, SWITZERLAND) 2023; 17:20. [PMID: 38203873 PMCID: PMC10779941 DOI: 10.3390/ma17010020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Revised: 12/01/2023] [Accepted: 12/18/2023] [Indexed: 01/12/2024]
Abstract
The pursuit of an advanced functional coating that simultaneously combines high hardness, wear resistance, and superior electrical conductivity has remained an elusive goal in the field of copper alloy surface enhancement. Traditional solid solution alloying methods often lead to a significant increase in electron scattering, resulting in a notable reduction in electrical conductivity, making it challenging to achieve a balance between high hardness, wear resistance, and high conductivity. The key lies in identifying a suitable microstructure where dislocation motion is effectively hindered while minimizing the scattering of conductive electrons. In this study, a novel Cu-MoSi2 coating was successfully fabricated on a CuCrZr alloy surface using the coaxial powder feeding high-speed laser cladding technique, with the addition of 10-30% MoSi2 particles. The coating significantly enhances the hardness and wear resistance of the copper substrate while maintaining favorable electrical conductivity. As the quantity of MoSi2 particles increases, the coating's hardness and wear resistance gradually improve, with minimal variance in conductivity. Among the coatings, the Cu-30%MoSi2 coating stands out with the highest hardness (974.5 HV0.5) and the lowest wear amount (0.062 mg/km), approximately 15 times the hardness of the copper base material (65 HV0.5) and only 0.45% of the wear amount (13.71 mg/km). Additionally, the coating exhibits a resistivity of 0.173 × 10-6 Ω·m. The extraordinary hardness and wear resistance of these coatings can be attributed to the dispersion strengthening effect of MoxSiy particles, while the high electrical conductivity is due to the low silicon content dissolved into the copper from the released MoSi2 particles, as well as the rapid cooling rates associated with the high-speed laser cladding process.
Collapse
Affiliation(s)
- Yanmiao Li
- School of Materials Science and Engineering, Central South University, Changsha 410083, China; (Y.L.); (X.Z.); (J.X.); (Y.X.); (Z.Y.); (M.L.)
| | - Xiaojun Zhao
- School of Materials Science and Engineering, Central South University, Changsha 410083, China; (Y.L.); (X.Z.); (J.X.); (Y.X.); (Z.Y.); (M.L.)
| | - Pengyuan Zhai
- New Technology Promotion Institute of China Ordnance Industries, Beijing 100089, China; (P.Z.); (P.F.)
| | - Pengyu Fan
- New Technology Promotion Institute of China Ordnance Industries, Beijing 100089, China; (P.Z.); (P.F.)
| | - Jiahui Xu
- School of Materials Science and Engineering, Central South University, Changsha 410083, China; (Y.L.); (X.Z.); (J.X.); (Y.X.); (Z.Y.); (M.L.)
| | - Yuefan Xu
- School of Materials Science and Engineering, Central South University, Changsha 410083, China; (Y.L.); (X.Z.); (J.X.); (Y.X.); (Z.Y.); (M.L.)
| | - Zengkai Yu
- School of Materials Science and Engineering, Central South University, Changsha 410083, China; (Y.L.); (X.Z.); (J.X.); (Y.X.); (Z.Y.); (M.L.)
| | - Muyang Li
- School of Materials Science and Engineering, Central South University, Changsha 410083, China; (Y.L.); (X.Z.); (J.X.); (Y.X.); (Z.Y.); (M.L.)
| | - Yongtong Zhang
- Henan Jianghe Machinery Co., Ltd., Pingdingshan 467337, China; (Y.Z.); (D.G.)
| | - Dawei Gao
- Henan Jianghe Machinery Co., Ltd., Pingdingshan 467337, China; (Y.Z.); (D.G.)
| | - Sainan Liu
- Center for Mineral Materials, School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
| | - Zhenyang Cai
- School of Materials Science and Engineering, Central South University, Changsha 410083, China; (Y.L.); (X.Z.); (J.X.); (Y.X.); (Z.Y.); (M.L.)
| | - Lairong Xiao
- School of Materials Science and Engineering, Central South University, Changsha 410083, China; (Y.L.); (X.Z.); (J.X.); (Y.X.); (Z.Y.); (M.L.)
| |
Collapse
|
|
2
|
The Effect of Reinforcement Preheating Temperatures on Tribological Behavior of Advanced Quranic Metal-Matrix Composites (QMMC). MATERIALS 2022; 15:ma15020659. [PMID: 35057376 PMCID: PMC8778457 DOI: 10.3390/ma15020659] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 01/13/2022] [Accepted: 01/14/2022] [Indexed: 02/05/2023]
Abstract
The growing applications of iron/copper bimetallic composites in various industries are increasing. The relationship between the properties of these materials and manufacturing parameters should be well understood. This paper represents an experimental study to evaluate the effect of reinforcement (steel rod) preheating temperature on the mechanical properties (bond strength, microhardness, and wear resistance) of copper matrix composites (QMMC). In preparing the QMMC samples, the melted copper was poured on a steel rod that had been preheated to various temperatures, namely, room temperature, 600 °C, 800 °C, and 1200 °C. Properties of the QMMC (interface microstructure, interfacial bonding strength, microhardness, and wear) were investigated. The experimental results revealed that the best bond between the copper matrix and steel rod formed only in the composites prepared by preheating the steel rods with temperatures lower than the recrystallization temperature of steel (723 °C). This is because the oxide layer and shrinkage voids (due to the difference in shrinkage between the two metals) at the interface hinder atom diffusion and bond formation at higher temperatures. The microhardness test showed that preheating steel rod to 600 °C gives the highest value among all the samples. Furthermore, the QMMC’s wear behavior confirmed that the optimization of preheating temperature is 600 °C.
Collapse
|