文献类型：期刊文献

英文题名：Corrosion resistance and thermal-mechanical properties of ceramic pellets to molten calcium-magnesium-alumina-silicate (CMAS)

作者：Fang, Huanjie[1];Wang, Weize[1];Huang, Jibo[1];Ye, Dongdong[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Minist Educ, Key Lab Pressure Syst & Safety, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2019

卷号：45

期号：16

起止页码：19710

外文期刊名：CERAMICS INTERNATIONAL

收录：;EI(收录号：20192807157192);WOS:【SCI-EXPANDED(收录号:WOS:000488148100016)】；

基金：This research is sponsored by the National Natural Science Foundation of China (Grant No. 51775189), Science and Technology Commission of Shanghai Municipality Project (16DZ2260604).

语种：英文

外文关键词：Thermal barrier coatings (TBCs); CMAS; Mullite; Corrosion

摘要：Because gas turbine engines must operate under increasingly harsh conditions, the degradation of thermal barrier coatings (TBCs) by calcium-magnesium-alumina-silicate (CMAS) is becoming an urgent issue. Mullite (3Al(2)O(3)center dot 2SiO(2)) is considered a potential material for CMAS resistance; however, the performance of mullite in the presence of CMAS is still unclear. In this study, mullite and Al2O3-SiO2 were premixed with yttria stabilized zirconia (YSZ) in different proportions, respectively. Porous ceramic pellets were used to conduct CMAS hot corrosion tests, and the penetration of molten CMAS and its mechanism were investigated. The thermal and mechanical properties of the samples were also characterized. It was found that the introduction of mullite and Al2O3-SiO2 mitigated the penetration of molten CMAS into the pellets owing to the formation of anorthite, especially at 45 wt% mullite/55 wt% YSZ. Compared with Al2O3-SiO2, mullite possesses a higher chemical activity and undergoes a faster reaction with CMAS, thus forming a sealing layer in a short time. Additionally, the thermal expansion coefficient, thermal conductivity, and fracture toughness of different samples were considered to guide the architectural design. Considering the CMAS corrosion resistance, thermal and mechanical performance of TBCs systematically, a TBC system with a multilayer architecture is proposed to provide a theoretical and practical basis for the design and optimization of the TBC microstructure.