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首页> 外文期刊>Surface & Coatings Technology >Electrophoretically deposited alumina as protective overlay for thermal barrier coatings against CMAS degradation
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Electrophoretically deposited alumina as protective overlay for thermal barrier coatings against CMAS degradation

机译：电泳沉积的氧化铝作为热障涂层的保护层，可防止CMAS降解

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摘要

TBCs are increasingly susceptible to degradation by airborne CMAS deposits. In order to mitigate the CMAS attack, we fabricated a dense, crack-free alumina overlay for TBCs by electrophoretic deposition (EPD) technique. Overlay coatings of controlled thickness were successfully fabricated for YSZ TBCs, by EPD followed by controlled sintering at 1200 degrees C. YSZ with alumina overlay coatings were tested for CMAS attack at 1300 degrees C. Detailed examination of microstructural changes and phase evolution in CMAS tested specimens was performed by X-ray diffraction and electron microscopy. Dense alumina overlay produced by EPD was found to physically suppress the infiltration of CMAS. Furthermore, CMAS was found to crystallize into anorthite (CaAl2Si2O8) and MgAl2O4 spinel by chemically interacting with EPID alpha-Al2O3. A shift in CMAS glass composition to a crystallizable Al-rich glass composition promoted the formation of anorthite platelets (CaAl2Si2O8) and localized enrichment of Mg promoted the formation of MgAl2O4 spinel. EPD alumina overlay on commercial-production TBCs retained its adhesion and structural integrity after 20cycles of 1-hour furnace thermal cycle test at 1100 degrees C.
机译：TBC越来越容易被机载CMAS沉积物降解。为了减轻CMAS攻击，我们通过电泳沉积（EPD）技术为TBC制造了致密，无裂纹的氧化铝覆盖层。通过EPD成功地为YSZ TBC制造了厚度受控的覆盖涂层，然后在1200摄氏度下进行了受控烧结。使用氧化铝覆盖涂层的YSZ在1300摄氏度下测试了CMAS侵蚀。详细检查了CMAS测试样品的微观结构变化和相演变通过X射线衍射和电子显微镜进行。发现EPD产生的致密氧化铝覆盖物在物理上抑制了CMAS的渗透。此外，发现CMAS通过与EPIDα-Al2O3发生化学反应而结晶成钙长石（CaAl2Si2O8）和MgAl2O4尖晶石。 CMAS玻璃组成向可结晶的富含Al的玻璃组成的转变促进了钙长石片状薄片（CaAl2Si2O8）的形成，Mg的局部富集促进了MgAl2O4尖晶石的形成。在1100℃下进行20小时的1小时炉子热循环测试后，商业生产的TBC上的EPD氧化铝覆盖层保持了其粘附性和结构完整性。

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