钴基合金电弧离子镀NiCrAlY涂层的组织结构和抗氧化性能  

Microstructure and oxidation resistance of NiCrAlY coating deposited on Co-based high-temperature alloy by arc ion plating technology

作　　者：周宏明[1] 易丹青[1] 肖来荣[1] 叶云[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2007年第5期830-836,共7页Journal of Central South University:Science and Technology

基　　金：中国博士后基金资助项目(20060400261);中南大学博士后基金资助项目(76132017)

摘　　要：采用电弧离子镀方法在Co基高温合金K640基体上制备NiCrAlY涂层,研究电弧离子镀涂层和真空退火后涂层的形貌、相结构及抗氧化性能。研究结果表明:电弧离子镀NiCrAlY涂层主要由γ-Ni,γ′-AlNi3和β-NiAl等相组成,衍射峰明显宽化,元素分布均匀;真空退火后涂层组织更致密,衍射峰尖锐,涂层主要由γ-Ni,γ′-AlNi3,β-NiAl,α-Cr以及极少量的Cr23C6组成,元素分布不均匀,Al和Y向涂层表面富集,Cr富集在涂层与基体界面附近。真空热处理可使电弧离子镀NiCrAlY涂层表面生成粘附性良好的α-Al2O3氧化膜,提高了电弧离子镀NiCrAlY涂层的抗氧化性能。The influence of vacuum heat treatment on NiCrAIY coating, which was deposited on a Co-based high-temperature alloy substrate （K640） by arc ion plating was investigated, The results show that the deposited NiCrAIY coating, which consists of a three-phase mixture： γ-Ni, γ′-AlNi3 and β-NiAl phase, has a homogeneous elemental distribution and widened diffraction peaks. After vacuum heat treatment, the deposited NiCrAlY coating mainly consists of γ-Ni, γ′-AlNi3, β-NiAl, α-Cr and trace of Cr23C6, and the outermost layer of the deposited NiCrAlY coating enriches in Al and Y, and depletes in Ni and Cr. However, the layer close to the substrate of the deposited NiCrAlY coating enriches in Cr, and depletes in Al and Ni. The deposited NiCrAlY coating after vacuum heat treatment forms α-Al2O3 and the α-Al2O3 scale has a better adherence to the NiCrAlY coating. Therefore the oxidation resistance of arc ion plated NiCrAlY coating improves through vacuum heat treatment.

关 键 词：电弧离子镀 NICRALY涂层 真空热处理 抗氧化性能 

分 类 号：TG174.451[金属学及工艺—金属表面处理]