Hot Corrosion Behavior of Double-ceramic-layer LaTi2 Al9O19/YSZ Thermal Barrier Coatings |
| |
Authors: | XIE Xiaoyun GUO Hongbo GONG Shengkai XU Huibin |
| |
Institution: | School of Materials Science and Engineering, Key Laboratory of Aerospace Materials & Performance (Ministry of Education), Beihang University, Beijing 100191, China |
| |
Abstract: | LaTi 2 Al 9 O 19 (LTA) exhibits promising potential as a new kind of thermal barrier coating (TBC) material, due to its excellent high-temperature capability and low thermal conductivity. In this paper, LTA/yttria stabilized zirconia (YSZ) TBCs are produced by atmospheric plasma spraying. Hot corrosion behavior and the related failure mechanism of the coating are investigated. Decomposition of LTA does not occur even after 1 458 hot corrosion cycles at 1 373 K, revealing good chemical stability in molten salt of Na 2 SO 4 and NaCl. However, the molten salt infiltrates to the bond coat, causing dissolving of the thermally grown oxide (TGO) in the molten salt and hot corrosion of the bond coat. As a result, cracking of the TBC occurs within the oxide layer. In conclusion, the ceramic materials LTA and YSZ reveal good chemical stability in molten salts of Na 2 SO 4 and NaCl, and the bond coat plays a significant role in providing protection for the component against hot corrosion in the LTA/YSZ TBCs. LTA exhibits very promising potential as a novel TBC material. |
| |
Keywords: | thermal barrier coatings LaTi 2 Al 9 O 19 hot corrosion plasma spraying failure |
本文献已被 CNKI ScienceDirect 等数据库收录! |
| 点击此处可从《中国航空学报》浏览原始摘要信息 |
| 点击此处可从《中国航空学报》下载免费的PDF全文 |
|