Reaction Mechanism and Thermal Insulation Property of Al-deposited 7YSZ Thermal Barrier Coating

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• 作者：Xiaofeng Zhang¹ ; ² ; Kesong Zhou¹ ; ² ; ^{kszhou200404@163.com" class="auth_mail" title="E-mail the corresponding author} ; Wei Xu¹ ; ² ; Jinbing Song² ; Chunming Deng² ; Min Liu²
• 关键词：Thermal barrier coating ; Al deposition ; Insulation property ; 伪-alumina
• 刊名：Journal of Materials Science & Technology
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：31
• 期：10
• 页码：1006-1010
• 全文大小：1739 K

文摘

To increase the performance and efficiency of thermal barrier coating (TBC), it is important to improve the thermal insulation property. In this work, a columnar Al film was deposited at the top of 7 wt% yttria-stabilized zirconia (7YSZ) TBC by magnetron sputtering. A vacuum heat treatment was then carried out to improve the insulation property of Al-deposited TBC. Reaction mechanism of Al-ZrO₂ system in Al-deposited TBC was studied by differential thermal analysis (DTA). The phase structures of the as-sprayed TBC, the Al-deposited and vacuum-treated TBC were characterized. The microstructure evolution of Al-deposited TBC was illustrated after vacuum heat treatment. And the insulation property of the as-sprayed TBC and treated TBC was compared. The results show that a multi-scaled layer, consisting of micron/nano structured 伪-Al₂O₃ and Al₃Zr grain was in situ synthesized at the top of 7YSZ coating via vacuum heat treatment. The TBC with the multi-scaled overlay has better insulation property than the as-sprayed TBC.