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首页> 外文期刊>Journal of the European Ceramic Society >Thermal shock resistance of air plasma sprayed thermal barrier coatings
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Thermal shock resistance of air plasma sprayed thermal barrier coatings

机译：空气等离子喷涂热障涂层的抗热震性

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摘要

The spallation resistance of an air plasma sprayed (APS) thermal barrier coating (TBC) to cool-down/reheat is evaluated for a pre-existing dclamination crack. The delamination emanates from a vertical crack through the coating and resides at the interface between coating and underlying thermally grown oxide layer (TGO). The coating progressively sinters during engine operation, and this leads to a depth-dependent increase in modulus. Following high temperature exposure, the coating is subjected to a cooling/reheating cycle representative of engine shut-down and start-up. The interfacial stress intensity factors are calculated for the delamination crack over this thermal cycle and are compared with the mode-dependent fracture toughness of the interface between sintered APS and TGO. The study reveals the role played by inicrostruclural evolution during sintering in dictating the spallation life of the thermal barrier coating, and also describes a test method for the measurement of dclamination toughness of a thin coating.
机译：针对预先存在的分层裂纹，评估了空气等离子喷涂（APS）热障涂层（TBC）的抗散裂性。分层从穿过涂层的垂直裂纹散发出来，并停留在涂层与下面的热生长氧化物层（TGO）之间的界面处。涂层在发动机运行期间逐渐烧结，这导致模量随深度的增加。高温暴露后，涂层将经受代表发动机关闭和启动的冷却/加热循环。计算该热循环中的分层裂纹的界面应力强度因子，并将其与烧结APS和TGO之间界面的取决于模式的断裂韧性进行比较。这项研究揭示了烧结过程中结构演化在决定隔热涂层剥落寿命方面所起的作用，还描述了一种测量薄涂层的分层韧性的测试方法。

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