喷涂距离对超音速火焰喷涂CoCrAlYTa涂层组织性能的影响  

The Influence of Spraying Distance on Structure and Properties of CoCrAlYTa Coating Prepared by HVOF

作　　者：高俊国[1] 陆峰[1] 汤智慧[1] 王长亮[1] 郭孟秋[1] 崔永静[1] 刁望勋[1] 

机构地区：[1]北京航空材料研究院金属腐蚀与防护研究室,北京100095

出　　处：《表面技术》2013年第1期1-4,13,共5页Surface Technology

基　　金：国家自然科学基金资助项目(51201156)

摘　　要：采用超音速火焰喷涂技术制备CoCrAlYTa涂层,研究了喷涂距离对涂层相组成、孔隙率以及硬度、弯曲强度、高温抗氧化性能的影响。结果表明:喷涂距离在200～300 mm范围内时,随着喷涂距离的减小,涂层的致密度增加,孔隙率下降,显微硬度和弯曲结合强度增加,但相组成基本不变,主要由CoAl,AlCo2Ta和CoTa3相组成;涂层致密度越高,在高温氧化过程中,表面越易尽早形成连续氧化膜并促进涂层中Al元素的选择氧化,因此随着喷涂距离的减小,涂层的高温抗氧化性能逐渐增强。CoCrA1YTa coatings were prepared by HVOF process and the influence of spraying distance on phase structure, porosity, hardness, bending strength and high temperature oxidation resistance of as-prepared coatings were also investigated. The results revealed that with the decrease of spraying distance, the compactness of the coating was enhanced and the porosity of the coating decreased in 200 300 nm spraying distance. The micro-hardness and bending strength were also enhanced with the decrease of spraying distance. Spraying distance had no impact on the phase composition of the coatings and the coatings were all composed of CoAl, A1Co2Ta and CoTa3. The continuous oxide scale was easily formed and selective oxidation of A1 was prone to being promoted for the more compact coatings during oxidation, which induced the oxidation resistance of the coatings increased with the decrease of spraying distance.

关 键 词：超音速火焰喷涂 CoCrAlYTa涂层 喷涂距离 组织 性能 

分 类 号：TG174.442[金属学及工艺—金属表面处理]