Plasma sprayed gadolinium zirconate thermal barrier coatings that are resistant to damage by molten Ca-Mg-Al-silicate glass

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• 作者：Julie M. Drexler^a ; Chun-Hu Chen^a ; Andrew D. Gledhill^a ; Kentaro Shinoda^b ; Sanjay Sampath^b ; Nitin P. Padture^c ; ^{nitin_padture@brown.edu}
• 关键词：Thermal barrier coatings ; Ceramics ; Gadolinium zirconate ; Silicate glass ; Crystallization
• 刊名：Surface and Coatings Technology
• 出版年：2012
• 期刊代码：106_02578972
• 类别：ms
• 出版时间：25 May, 2012
• 卷：206
• 期：19-20
• 页码：3911-3916
• 文件大小：4075 K

摘要

Air plasma sprayed (APS) Gd₂Zr₂O₇ thermal barrier coatings (TBCs) are found to be highly effective in resisting high-temperature (1200 掳C) penetration of molten Ca-Mg-Al-silicate (CMAS) glass deposit for prolonged durations (up to 1 week). In contrast, conventional APS 7YSZ TBCs are found to be fully penetrated by the molten CMAS glass under the same testing conditions. This resistance is attributed to the formation of a sealing layer made of crystalline Ca-apatite phase (based on Ca₂Gd₈(SiO₄)₆O₂) as a result of the high-temperature chemical interactions between the APS Gd₂Zr₂O₇ TBC and the CMAS glass. The resistance to penetration of molten silicate deposits offered by Gd₂Zr₂O₇ composition TBCs is relatively insensitive to both the type of molten silicate deposits (CMAS sand, volcanic ash, coal fly ash) and the TBC microstructure (APS, EB-PVD).