Microstructure, oxidation protection and failure mechanism of Yb2SiO5/LaMgAl11O19 coating deposited on C/SiC composites by atmospheric plasma spraying

• DOI: 10.1016/j.corsci.2012.05.020
• Publication Date: 2012-06-07T04:30:40Z
• Authors: Binglin Zou; Zuhair S. Khan; Lijian Gu; Xizhi Fan; Wenzhi Huang; Ying Wang; Yu Zhao; Chunjie Wang; Kuiyue Yang; Hongmei Ma; Xueqiang Cao
• Keywords: Temperature cycling

C/SiC composites were plasma sprayed with an Yb2SiO5/LaMgAl11O19 coating to improve the oxidation resistance. Microstructure, oxidation protection and failure mechanism of the coating during dynamic thermal cycling (DTC) were investigated. The results showed that good interfacial bonding between the substrate and coating was present before and after DTC. Weight loss for the sample coated on one-side was 4.1% after 11 cycles of heating for 85 min, for the uncoated sample it was as high as 20.6%. Failure mechanism of the coating resulted from the reaction sintering of the coating and the formation of bubbles between the substrate and the coating. (C) 2012 Elsevier Ltd. All rights reserved.