本文選題：熱障涂層 + 熱疲勞　； 參考：《中國表面工程》2015年03期

【摘要】：熱障涂層被廣泛應(yīng)用于航空發(fā)動機和燃?xì)廨啓C等高溫部件,其破壞機理和無損檢測手段是研究中急需解決的問題。采用EB-PVD方法制備了陶瓷層厚度分別為180、120和90μm的3組熱障涂層試樣,經(jīng)1 000℃高溫氧化0、1、10、50和100h后,用HR800激光顯微拉曼光譜儀測得試樣表面的拉曼光譜特性,利用掃描電鏡(SEM)觀測了試樣內(nèi)部裂紋及氧化層(TGO)厚度的演變。研究表明,EB-PVD熱障涂層裂紋主要發(fā)生在陶瓷層內(nèi)部及陶瓷層與粘結(jié)層的界面處,粘結(jié)層和基體界面處產(chǎn)生裂紋的概率相對較小;同等條件下,增大陶瓷層的噴涂厚度,可以減緩氧化層的生長速度,但是會增大陶瓷層表面應(yīng)力;熱障涂層表面殘余應(yīng)力會隨著熱氧化時間的增加而增大,當(dāng)表面殘余應(yīng)力減小時表明陶瓷層中有明顯的裂紋或脫落產(chǎn)生。
[Abstract]:Thermal barrier coatings are widely used in high temperature components such as aero-engines and gas turbines. The failure mechanism and nondestructive testing methods of thermal barrier coatings are urgently needed to be solved. Three groups of thermal barrier coating samples with thickness of 180120 渭 m and 90 渭 m were prepared by EB-PVD method. The Raman spectra of the samples were measured by HR800 laser micro-Raman spectrometer after oxidation at 1 000 鈩，

本文編號：2048547