中国电机工程学报Issue(z1)：176-181,6.DOI:10.13334/j.0258-8013.pcsee.2014.S.026
超音速火焰喷涂MCrAlY涂层氧化性能研究
Oxidation Behavior of High-velocity Oxygen Fuel Sprayed MCrAlY Coatings
李太江 1李勇 1李聚涛 1李巍 1刘刚 1米紫昊 1王乐 1吕品正1
作者信息
- 1. 西安热工研究院有限公司，陕西省 西安市 710032
- 折叠
摘要
Abstract
Oxidation behavior of bond coat in thermal barrier coatings is mainly determined by its composition and microstructure. High-velocity oxygen fuel (HVOF) spraying technology was employed to deposit NiCoCrAlTaY coatings and CoNiCrAlY coatings. The influence of MCrAlY bond coat composition on its oxidation performance and the growth mechanism of thermally grown oxides (TGO) were discussed based on the analysis on microstructure and oxidation tests. The results indicate that powder oxidation is occurred during its flight in HVOF flame. Hemispherical particles are found in the as-sprayed coatings. TGO after 25 h oxidation duration is dominated by Al2O3 scale. Ni/Cr/Co oxides form after 100 h oxidation duration. The HVOF sprayed CoNiCrAlY coating exhibites an oxidation kinetics coefficient of 0.272μm/h1/2 which is slightly lower than that of the NiCoCrAlTaY coatings. The formation of the mixed oxides is attributed to the competitive mechanism between the diffusion of Ni, Cr and Co elements and growth ratio of Al2O3 scale.关键词
热障涂层/MCrAlY涂层/热生长氧化物(TGO)/氧化/超音速火焰喷涂(HVOF)Key words
thermal barrier coatings/MCrAlY coating/thermally grown oxides (TGO)/oxidation/high-velocity oxygen fuel (HVOF)分类
矿业与冶金引用本文复制引用
李太江,李勇,李聚涛,李巍,刘刚,米紫昊,王乐,吕品正..超音速火焰喷涂MCrAlY涂层氧化性能研究[J].中国电机工程学报,2014,(z1):176-181,6.
