Investigation of three steps of hot corrosion process in Y_2O_3 stabilized ZrO_2 coatings including nano zones

查看全文 作　　者：Mohammadreza [1]Daroonparvar;Muhamad Azizi Mat [1]Yajid;Noordin Mohd [1]Yusof;Hamid Reza [1]BakhsheshiRad;Esah [1]Hamzah;Mohsen [2]Nazoktabar

机构地区：[1]Department of Materials,Manufacturing and Industrial Engineering,Faculty of Mechanical Engineering,Universiti Teknologi Malaysia;[2]Department of Mechanical Engineering,Faculty of Engineering,Roudehen Islamic Azad University

出　　处：《Journal of Rare Earths》索引2014年第32卷第10期,共14页

基　　金：Universiti Teknologi Malaysia and Ministry of Education of Malaysia for providing research facilities and research grants (R.J130000.7824.4F340 and Q.J130000.2524.04H78). 摘　　要：Phase transformation of tetragonal ZrO2 to monoclinic phase and also increment of bond coat oxidation kinetic(TGO thickening) can substantially restrict the life time of thermal barrier coating systems(TBCs). So, nanostructured and conventional Y2O3 stabilized ZrO2 coatings were evaluated in fused V2O5-Na2SO4 salts during thermal exposure in air. Microstructural characterization showed lower hot corrosion products(monoclinic zirconia, YVO4 crystals) formation and reduction of TGO thickness in thermal barrier coating system consisting of nanostructured Y2O3 stabilized ZrO2(YSZ) top coat. It was found that inhomogeneities, pores and micro-cracks played a principal role in the molten salts infiltration into the YSZ coating during three steps of hot corrosion process. In the nanostructured YSZ coating with tri-model structure, nano zones which surrounded by fully molten parts could fill the aforementioned defects and could act as barrier for the oxygen and corrosive molten salts penetration into the TBC. 关键词：纳米Y2O3 氧化锆涂层稳定氧化锆腐蚀工艺 ZrO2涂层热障涂层微观结构特征 YVO4晶体

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Investigation of three steps of hot corrosion process in Y_2O_3 stabilized ZrO_2 coatings including nano zones

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