对Ni-9.7Cr-5.5Al-7Ti溅射纳米晶涂层进行了空气中高温氧化实验,观察并分析了Ti的作用及影响.研究结果表明:由于涂层中相对较高的Ti含量,1 000℃氧化200h后生成了由α-Al2O3和TiO2组成的复杂氧化膜.TiO2的存在并没有降低涂层的抗高温氧化性能,而且生成的氧化膜与涂层基体有着很好的粘附性.这主要在于氧化初期生成的TiO2在随后氧化过程中没有发生长大,从而保证了保护性氧化膜的完整性.
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