TY - JOUR
T1 - Hot corrosion behavior of double-ceramic-layer LaTi 2Al 9O 19/YSZ thermal barrier coatings
AU - Xie, Xiaoyun
AU - Guo, Hongbo
AU - Gong, Shengkai
AU - Xu, Huibin
PY - 2012/2
Y1 - 2012/2
N2 - LaTi 2Al 9O 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 2SO 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 2SO 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.
AB - LaTi 2Al 9O 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 2SO 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 2SO 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.
KW - failure
KW - hot corrosion
KW - LaTi Al O
KW - plasma spraying
KW - thermal barrier coatings
UR - https://www.scopus.com/pages/publications/84863363993
U2 - 10.1016/S1000-9361(11)60372-5
DO - 10.1016/S1000-9361(11)60372-5
M3 - 文章
AN - SCOPUS:84863363993
SN - 1000-9361
VL - 25
SP - 137
EP - 142
JO - Chinese Journal of Aeronautics
JF - Chinese Journal of Aeronautics
IS - 1
ER -