Supersonic atmosphere plasma spraying (SAPS) can deposit Cr₃C₂-NiCr coatings in a very high efficiency to provide excellent anti-wear performance at high temperature. In the present work, the effect of post heat treatment on the microstructural evolution and the high-temperature wear performance (at 400 °C) of the Cr₃C₂-NiCr coatings was investigated. It is found that SAPS process facilitated the carbide dissolution/diffusion during particle flight while nano-sized carbides began to sufficiently precipitate from the supersaturated NiCr binder during post heat treatment. However, carbide decarburization could not be completely constrained and the volume fraction of carbide in the coating even thermally-treated at 750 °C was lower than that of original powders. The coating thermally-treated at 500 °C presented the highest hardness due to the precipitation strengthening of secondary carbides, which also induced the best wear-resistant property. Overall, the wear behavior of the coatings was correlated with the abrasive wear

超音速等离子喷涂（SAPS）可以非常高的效率沉积Cr ₃ C ₂ -NiCr涂层，从而在高温下提供出色的抗磨性能。在目前的工作中，后热处理对Cr ₃ C _2的组织演变和高温磨损性能（400°C）的影响-研究了NiCr涂层。发现SAPS工艺在颗粒飞行过程中促进了碳化物的溶解/扩散，而纳米尺寸的碳化物在后热处理过程中开始从过饱和的NiCr粘结剂中充分沉淀出来。但是，碳化物的脱碳不能完全被抑制，即使在750℃下进行热处理的涂层中碳化物的体积分数也低于原始粉末。由于二次碳化物的沉淀强化，在500°C热处理的涂层具有最高的硬度，这也带来了最佳的耐磨性。总体而言，涂层的磨损行为与磨料磨损相关