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给出了不同工艺制备钼基体Al2O3涂层的初步性能分析结果。等离子喷涂工艺由北京航空工艺研究所完成,包括基体与涂层之间的NiCrAl过渡层喷涂、无NiCrAl过渡层的Al2O3喷涂。喷涂时使用的保护性气体为Ar、N2,Al2O3涂层厚度为0.20mm、0.40mm。 对首批等离子喷涂8种工艺共94块样品进行了涂层结合强度试验、抗热冲击性能测试和金相分析,初步结果如下。 1）结合强度试验 采用拉伸方法进行结合强度测量,测得有过渡层样品的结合强度为5MPa左右,无过渡层样品的结合强度为30MPa。试验过程中,过渡层与基体完全脱离。其它工艺参数下制备样品的结
The preliminary results of the performance analysis of the preparation of molybdenum matrix Al2O3 coatings by different processes are given. Plasma spraying process by the Beijing Institute of Aeronautics completed, including the substrate and the coating between the NiCrAl transition coating, no transition layer of NiCrAl Al2O3 coating. Protective gas used for spraying Ar, N2, Al2O3 coating thickness of 0.20mm, 0.40mm. A total of 94 samples of eight kinds of plasma spraying processes were tested for coating adhesion strength, thermal shock resistance and metallographic analysis. The preliminary results are as follows. 1) Binding strength test Tensile strength was measured. The bonding strength of the transitional layer was about 5MPa, and the bonding strength of the non-transitional layer was 30MPa. During the test, the transitional layer completely separated from the substrate. Other process parameters prepared sample knot