摘要
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、γ′-AlNi3和β-Ni Al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-Ni Al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。
The NiCrAlY coatings were produced on a Co-based high-temperature alloy substrate by arc ion plating and annealed under vacuum conditions.The phase and the cyclic oxidation behavior of the cast alloy and the deposited coatings were investigated at 1 000 ℃ by using XRD,SEM and EDS technologies.It is shown that the deposited NiCrAlY coating,which consisted of a three-phase mixture: γ-Ni,γ′-AlNi3 and β-NiAl phase,have a homogeneous elemental distribution.After vacuum heat treatment,the grains in the coatings b...
出处
《机械工程材料》
CAS
CSCD
北大核心
2007年第12期54-58,61,共6页
Materials For Mechanical Engineering
基金
中国博士后基金资助项目(20060400261)
