航空学报 > 2006, Vol. 27 Issue (1): 138-141

盐雾腐蚀对热障涂层高温循环氧化性能的影响

项民, 骆军华, 张琦   

  1. 北京航空航天大学 材料科学与工程学院, 北京 100083
  • 收稿日期:2004-10-09 修回日期:2005-01-21 出版日期:2006-02-25 发布日期:2006-02-25

Influence of Salt Spray Corrosion on High-Temperature Cyclic Oxidation Behavior of Thermal Barrier Coatings

XIANG Min, LUO Jun-hua, ZHANG Qi   

  1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2004-10-09 Revised:2005-01-21 Online:2006-02-25 Published:2006-02-25

摘要: 利用电子束物理气相沉积法在Ni基高温合金表面制备了(ZrO2+MCrAlY)双层结构热障涂层。研究了常温盐雾腐蚀对其循环氧化行为的影响。试验结果表明涂层经过常温盐雾腐蚀后,陶瓷层的裂纹发生扩展,氧化锆晶体挤压、变形,同时由于常温盐雾环境的作用导致涂层在高温氧化过程中粘结层氧化严重,生成的热生长氧化层产生较大的体积膨胀效应,导致应力集中,降低了涂层的高温循环氧化性能,缩短了涂层的寿命。

关键词: 热障涂层, 循环氧化, 盐雾腐蚀, 涂层寿命, Ni基合金

Abstract: The influence of salt spray corrosion on high-temperature cyclic oxidation behavior of thermal barrier coatings (TBCs) prepared by electron beam physical vapor deposition (EB-PVD) have been investigated. It is found that there are more and greater cracks on the top-coat and the ZrO2 crystal produces deformation by being squeezed after the salt spray corrosion. The volume expansion associated to the bond-coat oxidation severely decreases the bonding strength between the top-coat and the bond-coat during high-temperature oxidation and reduces the lifetime of cyclic oxidation of thermal barrier coatings.

Key words: thermal barrier coatings, cyclic oxidation, salt spray corrosion, lifetime of the coating, Ni-substrate superalloy

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