研究了用真空熔烧法制得的镍基合金 -碳化铬复合涂层的热疲劳行为。结果表明 ,复合涂层的热疲劳行为与热循环上限温度、涂层厚度有关。随涂层厚度减薄 ,热疲劳抗力增加 ;随热循环上限温度升高 ,其热疲劳抗力降低。裂纹扩展由快到慢 ,最后停止 ,热疲劳裂纹有沿相界面开裂的特征。复合涂层具有高的抗氧化性 The thermal fatigue behavior of Ni-based alloy-chromium carbide composite coating prepared by vacuum melting method was studied. The results show that the thermal fatigue behavior of the composite coating is related to the maximum temperature of the thermal cycle and the coating thickness. With the thinning of the coating thickness, the thermal fatigue resistance increases; as the thermal cycling upper limit temperature increases, the thermal fatigue resistance decreases. Crack propagation from fast to slow, and finally stop, thermal fatigue crack along the phase interface cracking characteristics. Composite coatings have high oxidation resistance