Reaction Mechanism and Thermal Insulation Property of Al-deposited 7YSZ Thermal Barrier Coating
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2015年第10期
论文作者：Xiaofeng Zhang Kesong Zhou Wei Xu Jinbing Song Chunming Deng Min Liu
文章页码：1006 - 1010
摘 要：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% yttriastabilized 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-Zr O2 system in Aldeposited TBC was studied by differential thermal analysis（DTA）. The phase structures of the assprayed 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 assprayed TBC and treated TBC was compared. The results show that a multi-scaled layer, consisting of micron/nano structured α-Al2O3 and Al3 Zr 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 assprayed TBC.
Xiaofeng Zhang1,2，Kesong Zhou1,2，Wei Xu1,2，Jinbing Song2，Chunming Deng2，Min Liu2
1. School of Materials Science and Engineering,South China University of Technology2. Institute of New Materials,Guangzhou Research Institute of Non-ferrous Metals
摘 要：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% yttriastabilized 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-Zr O2 system in Aldeposited TBC was studied by differential thermal analysis（DTA）. The phase structures of the assprayed 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 assprayed TBC and treated TBC was compared. The results show that a multi-scaled layer, consisting of micron/nano structured α-Al2O3 and Al3 Zr 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 assprayed TBC.
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