Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 29    No. 11    November 2019

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Preparation of Al2O3 nanowires on 7YSZ thermal barrier coatings against CMAS corrosion
Xiao-feng ZHANG, Shao-peng NIU, Zi-qian DENG, Min LIU, Hong LI, Chun-ming DENG, Chang-guang DENG, Ke-song ZHOU

National Engineering Laboratory for Modern Materials Surface Engineering Technology,
Key Laboratory of Guangdong for Modern Surface Engineering Technology,
Guangdong Institute of New Materials, Guangzhou 510650, China

Abstract:The commonly-employed material for thermal barrier coatings (TBCs) is 7 wt.%Y2O3-ZrO2 (7YSZ), generally deposited by electron beam-physical vapor deposition (EB-PVD). Due to the increasing demand for higher operating temperature in aero-derivative gas turbines, a lot of effort has been made to prevent the premature failure of columnar 7YSZ TBCs, which is induced by the microstructure degradation, sintering and spallation after the deposition of infiltrated siliceous mineral (consisting of calcium-magnesium-aluminum-silicate (CaO-MgO-Al2O3-SiO2, i.e., CMAS)). A new method called Al-modification for columnar 7YSZ TBCs against CMAS corrosion was present. The Al film was magnetron-sputtered on the surface of the columnar 7YSZ TBCs, followed by performing vacuum heat treatment of the Al-deposited TBCs. During the heat treatment, the molten Al reacted with ZrO2 to form α-Al2O3 overlay that effectively hindered CMAS infiltration. Moreover, the Al film could evaporate and re-nucleate, leading to the generation of Al2O3 nanowires, which further restrained the moving of molten CMAS.

 

Key words: thermal barrier coating; CMAS corrosion; Al-modification; Al2O3 nanowires

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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