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cmas corrosion resistance characteristics of RE_(50)Ta_(x)Zr_(50-x)O_(175+0.5x)thermal barrier oxides in RE_(2)Zr_(2)O_(7)-RETaO_(4)systems

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Transactions of Nonferrous Metals Society of China 2022年第12期32卷 4014-4029页

作者： Shan-shan GONG Ming CHEN Xun-peng HUANG Fan ZHANG School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China

The corrosion resistance characteristics of RE-rich RE_(50)Ta_(x)Zr_(50-x)O_(175+0.5x)oxides in RE_(2)Zr_(2)O_(7)-RETaO_(4)systems to calcium-magnesium-alumino-silicate(cmas)at 1300°C,and the influence of RE^(3+)and Ta^(5+)on chemical reactions and reactive crystallization of cmas melts were *** results show that following the thermochemical reactions,apatite,pyrochlore,reprecipitated fluorite and residual Yb(Y)TaO4phases were the predominant reaction *** abilities of apatite and pyrochlore were found to be proportional to the ionic radius of RE^(3+).The increase of Ta^(5+)amount can decrease the number of available RE^(3+)to form ***,the resistance characteristic to cmas corrosion in RE_(50)Ta_(x)Zr_(50-x)O_(175+0.5x)systems was decided by the combined action of apatite and pyrochlore *** cohesive mixture of apatite and pyrochlore phases can generate a dense layer near the reaction front,which had a positive effect on suppressing cmas *** ability of the fluorite+RETaO4two-phase field was determined to be sufficient to mitigate cmas corrosion.

关键词： thermal barrier coatings cmas corrosion thermochemical reaction apatite pyrochlore penetration experiment

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Preparation of Al2O3 nanowires on 7YSZ thermal barrier coatings against cmas corrosion

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Transactions of Nonferrous Metals Society of China 2019年第11期29卷 2362-2370页

作者： 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 TechnologyGuangdong Institute of New MaterialsGuangzhou 510650China

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 *** Al film was magnetron-sputtered on the surface of the columnar 7YSZ TBCs,followed by performing vacuum heat treatment of the Al-deposited *** the heat treatment,the molten Al reacted with ZrO2 to formα-Al2O3 overlay that effectively hindered cmas ***,the Al film could evaporate and re-nucleate,leading to the generation of Al2O3 nanowires,which further restrained the moving of molten cmas.

关键词： thermal barrier coating cmas corrosion Al-modification Al2O3 nanowires

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