摘要
研究了一种新型梯度结构的ＥＢ－ＰＶＤ（电子束物理气相沉积）热障涂层的热循环性能，并分析了涂层的失效机制结果表明，由于ＮＩＣｏＣｒＡｌＹ粘结层以及在粘结层上形成的 ＮｉｓＡｌ薄层发生了选择性氧化，从而在粘结层和梯度过渡层之间形成了一层Ａｌ２Ｏ３层、随着热循环时间增长， Ａｌ２Ｏ３层不断增厚，而且在热循环应力作用下，涂层最终沿Ａｌ２Ｏ３层内部断裂失效．
Thermal cycling behavior of a new type gradient thermal barrier coating produced by electron beam physical vapor deposition (EB-PVD) was studied and its failure mechanism also analyzed. It is found that an a-Al2O3 scale was formed between NiCoCrAlY bond coat and gradient transition layer in the coating, which results from the selective oxidation of the NiCoCrAlY bond coat and Ni3Al thin film on the surface of the bond coat. As the thermal cycling test went on, the thickness of the Al2O3 scale increased and under the action of thermal stress in the oxide scale, failure of the gradient coating eventually took place by cracking within the Al2O3 scale.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第2期151-155,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金 59772028
航空基金97H51060
关键词
EB-PVD
梯度热障涂层
热循环
过渡层
失效机制
electron beam physical vapor deposition (EB-PVD), gradient thermal barrier coating, thermal cycling, transition layer
