采用电弧离子镀在钴基高温合金K640基体上制备了NiCrAlY涂层,并进行了真空退火处理.通过X射线衍射、扫描电镜和能谱分析等技术对涂层的相结构和基体及涂层在1 000℃下的抗循环氧化行为进行了研究.结果表明:沉积态涂层主要由γ-Ni、γ1-A1Ni3和β-NiAl等物相组成,元素分布均匀;涂层真空退火后衍射峰尖锐,晶粒明显长大,主要由γ-Ni、γ'-AlNi3、β-NiAl和α-Cr以及极少量的Cr23C6组成.涂层在循环氧化过程中形成Al2O3保护膜,经过100次循环后Al2O3氧化膜仍然完好.真空退火可使溅射涂层表面较早生成保护性能良好的α-Al2O3氧化膜,提高了涂层的抗氧化性能.
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