A Novel Superhard, Wear-Resistant, and Highly Conductive Cu-MoSi<sub>2</sub> Coating Fabricated by High-Speed Laser Cladding Technique
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 incre...
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| Format: | Article |
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MDPI AG
2023-12-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/17/1/20 |
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| author | Yanmiao Li Xiaojun Zhao Pengyuan Zhai Pengyu Fan Jiahui Xu Yuefan Xu Zengkai Yu Muyang Li Yongtong Zhang Dawei Gao Sainan Liu Zhenyang Cai Lairong Xiao |
| author_facet | Yanmiao Li Xiaojun Zhao Pengyuan Zhai Pengyu Fan Jiahui Xu Yuefan Xu Zengkai Yu Muyang Li Yongtong Zhang Dawei Gao Sainan Liu Zhenyang Cai Lairong Xiao |
| author_sort | Yanmiao Li |
| collection | DOAJ |
| description | 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-MoSi<sub>2</sub> 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% MoSi<sub>2</sub> particles. The coating significantly enhances the hardness and wear resistance of the copper substrate while maintaining favorable electrical conductivity. As the quantity of MoSi<sub>2</sub> particles increases, the coating’s hardness and wear resistance gradually improve, with minimal variance in conductivity. Among the coatings, the Cu-30%MoSi<sub>2</sub> coating stands out with the highest hardness (974.5 HV<sub>0.5</sub>) and the lowest wear amount (0.062 mg/km), approximately 15 times the hardness of the copper base material (65 HV<sub>0.5</sub>) and only 0.45% of the wear amount (13.71 mg/km). Additionally, the coating exhibits a resistivity of 0.173 × 10<sup>−6</sup> Ω·m. The extraordinary hardness and wear resistance of these coatings can be attributed to the dispersion strengthening effect of Mo<sub>x</sub>Si<sub>y</sub> particles, while the high electrical conductivity is due to the low silicon content dissolved into the copper from the released MoSi<sub>2</sub> particles, as well as the rapid cooling rates associated with the high-speed laser cladding process. |
| first_indexed | 2024-03-08T15:03:52Z |
| format | Article |
| id | doaj.art-ee362e49ae584084846449d17bec17cd |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-08T15:03:52Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-ee362e49ae584084846449d17bec17cd2024-01-10T15:02:09ZengMDPI AGMaterials1996-19442023-12-011712010.3390/ma17010020A Novel Superhard, Wear-Resistant, and Highly Conductive Cu-MoSi<sub>2</sub> Coating Fabricated by High-Speed Laser Cladding TechniqueYanmiao Li0Xiaojun Zhao1Pengyuan Zhai2Pengyu Fan3Jiahui Xu4Yuefan Xu5Zengkai Yu6Muyang Li7Yongtong Zhang8Dawei Gao9Sainan Liu10Zhenyang Cai11Lairong Xiao12School of Materials Science and Engineering, Central South University, Changsha 410083, ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, ChinaNew Technology Promotion Institute of China Ordnance Industries, Beijing 100089, ChinaNew Technology Promotion Institute of China Ordnance Industries, Beijing 100089, ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, ChinaHenan Jianghe Machinery Co., Ltd., Pingdingshan 467337, ChinaHenan Jianghe Machinery Co., Ltd., Pingdingshan 467337, ChinaCenter for Mineral Materials, School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, ChinaThe 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-MoSi<sub>2</sub> 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% MoSi<sub>2</sub> particles. The coating significantly enhances the hardness and wear resistance of the copper substrate while maintaining favorable electrical conductivity. As the quantity of MoSi<sub>2</sub> particles increases, the coating’s hardness and wear resistance gradually improve, with minimal variance in conductivity. Among the coatings, the Cu-30%MoSi<sub>2</sub> coating stands out with the highest hardness (974.5 HV<sub>0.5</sub>) and the lowest wear amount (0.062 mg/km), approximately 15 times the hardness of the copper base material (65 HV<sub>0.5</sub>) and only 0.45% of the wear amount (13.71 mg/km). Additionally, the coating exhibits a resistivity of 0.173 × 10<sup>−6</sup> Ω·m. The extraordinary hardness and wear resistance of these coatings can be attributed to the dispersion strengthening effect of Mo<sub>x</sub>Si<sub>y</sub> particles, while the high electrical conductivity is due to the low silicon content dissolved into the copper from the released MoSi<sub>2</sub> particles, as well as the rapid cooling rates associated with the high-speed laser cladding process.https://www.mdpi.com/1996-1944/17/1/20copper-based coatinglaser claddingwear resistanceconductivefirst principles |
| spellingShingle | Yanmiao Li Xiaojun Zhao Pengyuan Zhai Pengyu Fan Jiahui Xu Yuefan Xu Zengkai Yu Muyang Li Yongtong Zhang Dawei Gao Sainan Liu Zhenyang Cai Lairong Xiao A Novel Superhard, Wear-Resistant, and Highly Conductive Cu-MoSi<sub>2</sub> Coating Fabricated by High-Speed Laser Cladding Technique Materials copper-based coating laser cladding wear resistance conductive first principles |
| title | A Novel Superhard, Wear-Resistant, and Highly Conductive Cu-MoSi<sub>2</sub> Coating Fabricated by High-Speed Laser Cladding Technique |
| title_full | A Novel Superhard, Wear-Resistant, and Highly Conductive Cu-MoSi<sub>2</sub> Coating Fabricated by High-Speed Laser Cladding Technique |
| title_fullStr | A Novel Superhard, Wear-Resistant, and Highly Conductive Cu-MoSi<sub>2</sub> Coating Fabricated by High-Speed Laser Cladding Technique |
| title_full_unstemmed | A Novel Superhard, Wear-Resistant, and Highly Conductive Cu-MoSi<sub>2</sub> Coating Fabricated by High-Speed Laser Cladding Technique |
| title_short | A Novel Superhard, Wear-Resistant, and Highly Conductive Cu-MoSi<sub>2</sub> Coating Fabricated by High-Speed Laser Cladding Technique |
| title_sort | novel superhard wear resistant and highly conductive cu mosi sub 2 sub coating fabricated by high speed laser cladding technique |
| topic | copper-based coating laser cladding wear resistance conductive first principles |
| url | https://www.mdpi.com/1996-1944/17/1/20 |
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