Abstract
NiCr/Ag-Mo composite coating was fabricated by atmospheric plasma spray technology using clad powders as the feedstock. Its tribological properties at variable temperature were evaluated using a ball-on-disk high-temperature tribometer in air. The results showed that compared with NiCr, the NiCr/Ag-Mo composite coating exhibited better lubrication effect and higher wear resistance at all test temperatures, especially above 600 °C. At 800 °C, NiCr/Ag-Mo composite coating showed the lowest friction coefficient of about 0.2 and its corresponding wear rate reached 2.5 × 10−5 mm3/Nm. Characterizations of NiCr/Ag-Mo composite coating revealed that at temperatures below 400 °C, Ag was smeared and spread onto the wear surface, reducing the friction and wear. At temperature above 500 °C, the Ag2MoO4 lubrication film formed by tribo-oxidation significantly improved the coating’s lubrication effect and wear resistance.
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Acknowledgments
The authors are grateful for the financial support of the National Natural Science Foundation of China (Grant Nos. 51471159 and 51671180) and the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20140476).
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Zhang, T., Lan, H., Yu, S. et al. High-Temperature Solid Lubricant Coating by Plasma Spraying Using Metal-Metal Clad Powders. J Therm Spray Tech 26, 1268–1278 (2017). https://doi.org/10.1007/s11666-017-0591-0
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DOI: https://doi.org/10.1007/s11666-017-0591-0