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Processes to Improve Service Performance of Thermal Barrier Coatings

机译:改善热障涂层使用性能的过程

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In order to increase the gas turbine inlet temperature, thermal barrier coatings (TBCs) applied ongas turbine components have been investigated and developed for over forty years. Thermal barriercoatings generally exhibit nonuniform microstructures that include voids, unmelted particles and oxideinclusions and may also demonstrate poor bonding adhesion between the TBC and the bond coatwhich lowers the overall thermal shock resistance of thermal barrier coatings. The performance ofthermal barrier coatings is dependent on its: (1) chemistry, (2) microstructure, (3) stress magnitude andinteractions, and (4) environmental interactions. In a hot corrosion environment, the absorption ofcorrosion products into the porous structure tends to cause premature fracture of the thermal barriercoatings. The paper discusses the historical and current understanding of thermal barrier coatings andpossible directions to improve performance in marine gas turbine engines.
机译:为了提高燃气轮机入口温度,已经研究和开发了应用于燃气轮机部件的热障涂层(TBC)40多年了。隔热涂层通常表现出不均匀的微观结构,包括孔隙,未熔化的颗粒和氧化物夹杂物,并且还可能在TBC和粘合涂层之间表现出较差的粘合力,从而降低了隔热涂层的整体耐热冲击性。隔热涂层的性能取决于:(1)化学,(2)微观结构,(3)应力大小和相互作用以及(4)环境相互作用。在热腐蚀环境中,腐蚀产物吸收到多孔结构中往往会导致热障涂层过早断裂。本文讨论了对隔热涂层的历史和当前认识,以及提高船用燃气轮机发动机性能的可能方向。

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