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Effects of Pre-Oxide Layer Thickness on Thermal Cyclic Behavior of Thermal Barrier Coatings

机译:预氧化物层厚度对热障涂层热循环行为的影响

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摘要

Conventional two-layered structure thermal barrier coatings (TBCs) with different pre-oxide layer thicknesses were produced by EB-PVD onto Ni-based superalloy. The pre-oxide layer with different thicknesses was formed after vacuum heat treatment for 2 hours and before ceramic deposition by heating the bond coat to 1323K in air for different times. It has been found that with pre-oxide layer thickness increasing from 1μm to 3.1μm, the growth rate of thermally grown oxide (TGO) increased during thermal cycling test and the thermal cyclic lifetime of TBCs decreased from 730hs to 400hs Two failure modes were observed for TBCs with different pre-oxide layer thicknesses and different TGO layer growth rates.
机译:通过EB-PVD在镍基高温合金上生产具有不同预氧化物层厚度的传统两层结构热障涂层(TBC)。在真空热处理2小时后和在陶瓷沉积之前,通过在空气中将粘合层加热到1323K不同的时间,形成具有不同厚度的预氧化物层。已经发现,随着预氧化物层厚度从1μm增加到3.1μm,热循环测试期间热生长氧化物(TGO)的生长速率增加,TBC的热循环寿命从730hs减少到400hs。适用于具有不同预氧化物层厚度和不同TGO层生长速率的TBC。

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