低压等离子喷涂NiCoCrAlYTa涂层的组织结构及抗氧化性能

来源期刊：中南大学学报(自然科学版)2008年第4期

论文作者：周宏明 易丹青

文章页码：741 - 747

关键词：低压等离子喷涂；NiCoCrAlYTa涂层；真空热处理；组织结构；抗氧化性能；

Key words：low-pressure plasma spray; NiCoCrAlYTa coating; vacuum annealed; phase structure; oxidation resistance

摘    要：

Abstract: NiCoCrAlYTa coating on a Co-based high-temperature alloy (K640) substrate was prepared by low-pressure plasma spray (LPPS). The phase structure and oxidation resistance of LPPS and vacuum annealed coating were investigated by XRD, SEM and EDS. The results show that the sprayed NiCoCrAlYTa coating, which consists of a three-phase mixture, i.e., γ-Ni, γ′-AlNi3 and trace of β-NiAl phase, has a homogeneous element distribution, shows a typical layer structure, and has a small amount pore in the deposited interface. After vacuum heat treatment, the NiCoCrAlYTa coating mainly consists of γ-Ni, γ′-AlNi3 and β-NiAl phase; the diffraction peak becomes sharp, and the outermost layer of the coating is rich in Al and Y. However, the layer closed to the substrate of the coating is rich in Cr, and depletes in Al and Ni. Lots of small holes are formed on the surface of the vacuum annealed coating, which decreases the oxidation resistance of NiCoCrAlYTa coating prepared by LPPS.

基金信息：中国博士后基金资助项目