热喷涂及电子束物理气相沉积技术在热障涂层制备中的应用.pdfVIP

# 98 # : 2009 7 ()23 7 * ,,, ( 河南工程学院机械工程系, 郑州 450007) , 、、、、 、、。 、、。 、EB2PVD 。 热障涂层 火焰喷涂 爆炸喷涂 等离子喷涂 :TG174.4 :A Application of Thermal2spraying and Electron Beam Physical Vapor Deposition Technologies on Preparation of ThermalBarrier Coatings ZHANG Hongsong, GENG Guoqiang, DU eke, ZHANG Zheng (Department of Mechanical Engineering, Henan Institute of Engineering, Zhengzhou 450007) Abstract A few preparation technologies of thermal barrier coatings, including flame spraying, detonation spraying, atmospheric plasma spraying, plazjet plasma spraying, supersonic plasma spraying, low pressure plasma spraying, solution precursor plasma spraying as well as electron beam physical vapor deposition technology are sum2 marized respectively. The principles, technical characteristics, existing shortages and the corresponding resolving methods of each technology are introduced. It is indicated that the development of detonation spraying, solution pre2 cursor plasma spraying, electron beam physical vapor deposition as well as their applications for preparation of novel thermal barrier coatings should be regarded the research emphasis in the future. Key words thermal barrier coatings, flame spraying, detonation spraying, plasma spraying 热障涂层(Thermal barrier coatings, TBCs)是通过特殊 热障涂层研究中多以粉末喷涂为主。喷涂中通常使用乙炔 的工 将具有良好隔热性能的陶瓷材料涂到航空发动机的 和氧组合提供热量, 也可以使用甲基乙炔、丙二炔(MPS) 、丙 关键热端部件表面得到的一层保护层, 厚度一般不超过 烷、氢气或天然气。喷枪通过气阀引入乙炔和氧气, 二者混 [ 1] 0. 5mm 。该类涂层虽然很薄,却能有效避免航空涡轮发动 合后在喷嘴处产生燃烧火焰。喷枪上设有粉斗或进粉管, 利 机热端关键部件与高温燃气的直接接触, 从而为发动机热端 用送粉气流产生的负压抽吸粉末, 使粉末随气流进入火焰, 部件提供有效保护。由于其优良的性能, 热障涂层在航空发 在火焰中被加热熔化或软化后, 在气流和焰流的作用下喷射