EB-PVD热障涂层等温氧化过程中的界面韧性变化  

Change in interfacial toughness of EB-PVD thermal barrier coatings during isothermal oxidation

作　　者：徐前岗[1] 唐建新[1] 王宁[1] 陆峰[1] 吴学仁[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2004年第2期46-49,共4页Journal of Aeronautical Materials

摘　　要：用压入法测试了电子束物理气相沉积热障涂层在1100℃等温氧化过程中的界面韧性,该热障涂层体系的界面韧性(Гi)在38～45J m2之间。在等温暴露过程中,界面韧性Гi变化较小;但由于TGO增厚引起涂层的弹性应变能(G0)快速增长,使得归一化的界面韧性(Гi G0)随暴露时间而急剧降低,逐渐趋于1。结果表明,粘结层的热生长氧化物(TGO)的增厚是热障涂层失效的一个重要原因。Indentation test was used to measure the change in the interfacial toughness of EB-PVD TBCs at 1100℃. Measured interfacial toughness (Г_i) of TBCs is about 38～45 J/m^2 and changes slightly. Due to the rapid increase of elastic strain energy (G_0) induced by the thickening of TGO, the normalized interfacial toughness (Г_i/G_0) decreases sharply and approaches 1 gradually. This result indicates that the thickening of TGO formed by the oxidation of bond coat plays an important role in the failure of TBCs.

关 键 词：EB-PVD热障涂层 等温氧化过程 界面韧性 压入法 测试 

分 类 号：TG174.44[金属学及工艺—金属表面处理]