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首页> 外文期刊>Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing >Heat treatment of thermal barrier coatings
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Heat treatment of thermal barrier coatings

机译：隔热涂层的热处理

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Thermal barrier coatings (TBCs) with CoNiCrAlY bond-coat and 0.3 mm thick zirconia top-coat were air plasma sprayed (APS) onto a nickel-base super alloy, Hastelloy-X and 316L stainless substrates. The samples were heat treated at different temperatures. The resulting microstructural features and fracture surfaces of the zirconia top-coat were studied by optical and electron microscopies. Formation of spinels was observed close to the thermal grown oxide (TGO)/top-coat interface, and it was noticed that this layer became thicker during long heat treatments. Top-coat phase stability was assessed by X-ray diffraction, and it was observed that for long heat treatments the top-coat transformed up to 26 percent into monoclinic phase. Residual stresses and relative interfacial toughness are also important factors, which affect the life of the TBC. They were determined by the hole drill method and by Vickers indentation. The relative interfacial toughness between the top-coat and bond-coat increased with increasing temperature for nickel-base super alloy substrates whereas, for stainless steel based TBCs it increased only up to 650 deg C and then decreased with increasing temperature. For long heat treatments, the nickel-base TBCs showed that the interface between top-coat and bond-coat deteriorated with extended exposure time.
机译：将具有CoNiCrAlY键合涂层和0.3毫米厚的氧化锆面涂层的热障涂层（TBC）空气等离子喷涂（APS）到镍基超级合金，Hastelloy-X和316L不锈钢基材上。样品在不同温度下进行了热处理。通过光学和电子显微镜研究了所得的氧化锆面涂层的微观结构特征和断裂表面。在靠近热生长氧化物（TGO）/面涂层界面处观察到尖晶石的形成，并且注意到在长时间的热处理期间该层变得更厚。通过X射线衍射评估了面漆相的稳定性，并且观察到，对于长时间的热处理，面漆最多可转变为26％的单斜晶相。残余应力和相对界面韧性也是影响TBC寿命的重要因素。它们是通过钻孔方法和维氏压痕确定的。对于镍基超级合金基体，面涂层和粘结层之间的相对界面韧性随温度升高而增加，而对于不锈钢基TBC，它仅在650摄氏度时才升高，然后随温度升高而降低。对于长时间的热处理，镍基TBCs表明，随着暴露时间的延长，面涂层和粘结涂层之间的界面会变差。

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