Inelastic Deformation of Freestanding Plasma-Sprayed Thermal Barrier Coatings
Inelastic Deformation of Freestanding Plasma-Sprayed Thermal Barrier Coatings
复制标题
独立式等离子喷涂热障涂层的非弹性变形
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
K. Fujimoto
中科院分区：
文献类型：
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作者：
M. Arai;Xiaohong Wu;K. Fujimoto
对等离子喷涂热障涂层的非弹性变形进行了基础性研究。进行悬臂式弯曲试验，以获得应力-应变曲线从独立的陶瓷层脱离的TBC涂层的样品通过电化学处理。为了研究样品中的非弹性变形，通过可以插入SEM真空室的小型拉伸测试装置进行原位扫描电子显微镜（SEM）观察。弯曲试验结果表明，尽管涂层是陶瓷材料，但在单调载荷作用下，涂层的变形呈现非线性。喷涂参数如飞行速度对应力-应变曲线影响显著。在弯曲试验过程中的原位扫描电镜观察显示，在非弹性变形中，在板条之间的边界处的滑动起着重要的作用。
A fundamental study of inelastic deformation of freestanding plasma-sprayed thermal barrier coatings (TBCs) has been conducted. Cantilever-type bending tests are carried out to obtain stress-strain curves from freestanding ceramic layers detached from the TBC-coated sample via electrochemical treatment. In order to investigate inelastic deformation in the sample, in-situ scanning electron microscope (SEM) observation is performed by means of a small tensile testing device that can be inserted into the SEM vacuum chamber. The bending test result indicated that the coating deforms with a nonlinear behavior under monotonic loading, in spite of the fact that it is a ceramic material. Spray parameters such as in-flight velocity affected the stress-strain curve significantly. In-situ SEM observation during the bending test revealed that sliding at boundaries between splats plays an important role in inelastic deformation.