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综述了热障涂层 (TBC)系统的结构特点、常规机械性能的测试方法、失效模式和失效机理 ,分析了现有的几种预测寿命模型。主要结论为 :无论是等离子喷涂法 ,还是电子束物理汽相沉积法 (ED -PVD)和电子束化学汽相沉积法制造的涂层 ,粘结层的氧化是失效的一个重要原因 ;目前广泛采用的压痕法以及数值分析法得到的涂层材料性能与实际情况都有较大的差距 ;在制造和热处理过程中带来的残余应力与残余应变对涂层寿命有较大的影响 ,当前的分析和实验手段都不能很好处理这个问题。重点分析了NASA提出的几个涂层寿命模型 ,这些模型都考虑了细观结构的变化和失效机理 ,但模型参数的确定有较大的困难
The structural features of TBC system, the testing methods of conventional mechanical properties, failure modes and failure mechanisms are reviewed. Several existing models for predicting life expectancy are analyzed. The main conclusion is that the oxidation of the adhesive layer is an important cause of failure due to either the plasma spray coating or the coating produced by electron beam physical vapor deposition (ED-PVD) and electron beam chemical vapor deposition. Currently, Using the indentation method and numerical analysis of the coating material properties and the actual situation there is a big gap between the manufacturing and heat treatment in the residual stress and residual strain on the life of the coating have a greater impact on the current The analysis and experimental methods are not good to deal with this problem. Several coating life models proposed by NASA are emphatically analyzed. All of these models take into account the change of meso-structure and the failure mechanism, but there are great difficulties in determining the model parameters