采用热重分析及现代表面分析方法研究了低压等离子喷涂NiCrAlY涂层在纯氧以及含5%水蒸气的O2中的高温氧化行为,结果表明:在纯氧的氧化环境中,NiCrAlY涂层氧化动力学遵循抛物线规律,在含有5%的水蒸气的O2中,NiCrAlY涂层在氧化至110 h后氧化动力学几乎呈直线规律.XRD及SEM分析显示,NiCrAlY涂层在O2中氧化180 h后,表面形成一层致密的Al2O3;而在含5%水蒸气的O2中氧化180 h后表面氧化层中除了有Al2O3外,还有NiO和Cr2O3.其原因在于水蒸气中的氢在氧化物中的溶解,致使Ni2+扩散速度增加,使氧化层变得疏松,降低其抗氧化性.
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