Abstract
In this study, a tungsten carbide (WC)-Ni-Cr composite and a coating composition of Cr3C2 in WC-Ni-Cr were selected and fabricated using a high-velocity oxy-fuel (HVOF) method, to explore their applicability as wear-resistant coatings on cast iron substrates used in automotive brakes. Furthermore, to investigate the effect of post-annealing on the wear performance of the coatings, the coated samples were heat-treated at 500 and 850 °C. The microstructure, phase formation behavior, composition, and wear rate of the coated samples and post-annealed coatings were analyzed. Furthermore, the wear characteristics of the coatings were analyzed using a ball-on-disk method with a Si3N4 ball. By comparing the wear and friction characteristics of each coating, before and after heat treatment, the wear resistance performance of the coating could be related to the surface oxidation caused by heat treatment. In summary, the oxidation and phase change caused by the heat treatment reduced the wear resistance; however, if appropriate heat treatment conditions are satisfied, the frictional force required for automotive braking can be increased. Furthermore, the WC-Ni-Cr + Cr3C2 coating, where Cr3C2 was added to WC-Ni-Cr, exhibited an improved wear resistance compared to the coating with only WC-Ni-Cr. This was predicted to be an enhancement effect produced by the addition of Cr3C2.
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Acknowledgements
This work is financially supported under the program of “Development of the high performance brake for passenger car and commercial vehicle to reduce particulate matter” (20003598) by ministry of trade, industry, and energy of Korea.
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“Development of the high performance brake for passenger car and commercial vehicle to reduce particulate matter” (20003598) by ministry of trade, industry, and energy of Korea.
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Hong, S.Y., Nahm, S. & Oh, Y.S. Effect of heat treatment on the wear behavior of WC-Ni-Cr and WC-Ni-Cr + Cr3C2 coatings fabricated by high-velocity oxy-fuel method. J. Korean Ceram. Soc. 59, 465–472 (2022). https://doi.org/10.1007/s43207-022-00204-1
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DOI: https://doi.org/10.1007/s43207-022-00204-1