热障涂层杨氏模量和泊松比的测试

为了降低航空发动机热端部件的温度，空气等离子喷涂已被广泛地应用。为确定热障涂层的残余应力、结合力、断裂韧性、疲劳裂纹扩展速率等性能和特性，需要知道其杨氏模量和泊松比。因为涂层厚度非常薄且使用时是结合在基体上的，所以需要一个能够在原处测量涂层的杨氏模量和泊松比的方法。采用等离子喷涂工艺在GH150高温合金上喷涂了MCrAIY和陶瓷层，利用一种改进的悬臂梁方法测量了热障涂层的杨氏模量和泊松比。这种无损测试方法为测定其他薄膜材料的杨氏模量和泊松比提供了借鉴。

Measurement of Young's Modulus and Poisson's Ratio of Thermal Barrier Coatings

In gas turbines, thermal barrier coatings (TBCs) applied by air plasma spraying are widely used to lower the temperature of hot components. To analyze the characteristics of TBCs such as residual stress, bond strength, fracture toughness, and crack propagation ratio, the Young's modulus and Poisson's ratio are important parameters. For TBC is a brittle and thin film, it is desirable to evaluate those properties while the coatings are bonded to a substrate. An atmospheric plasma spray MCrAlY bond coat and Yttria stabilized zirconia (YSZ) top coat are deposited onto a nickel-base superalloy GH150 substrate. The Young's modulus and Poisson's ratio are measured by cantilever beam bending with NDI. The method will be developed to test the Young's modulus and Poisson ratio of other multilayer systems.