材料科学
热障涂层
复合材料
氧化钇稳定氧化锆
立方氧化锆
温度循环
陶瓷
四方晶系
单斜晶系
兴奋剂
相(物质)
热的
晶体结构
结晶学
气象学
物理
光电子学
有机化学
化学
作者
Jianwei Dai,Bing Huang,Limin He,Rende Mu,He Tian,Zhenhua Xu
标识
DOI:10.1016/j.mtcomm.2023.105409
摘要
Yb2O3-doped yttria-stabilized zirconia (YbYSZ) thermal barrier coatings (TBCs) with different Yb2O3 and Y2O3 doping contents were fabricated via electron beam physical vapor deposition. Phase stability, thermal conductivity, and thermal cycling behavior as well as failure mechanism of three types of YbYSZ were comparatively studied. It was found that components of as-deposited ceramic coatings deviated from those of corresponding ingots (Yb and Y contents were 6.50 and 5.73 at%, respectively, for 4.5Yb4YSZ ingot). As-deposited 6.5Yb2YSZ and 4.5Yb4YSZ coatings consisted of tetragonal, tetragonal-prime, and cubic phases, while monoclinic phase was found in 8.5YbSZ. After 6000 h of thermal cycling oxidation at 1150 ℃, 8.5YbSZ had the largest amount of monoclinic phase (69%), while 4.5Yb4YSZ had the minimum (24%). Delamination was found to occur inside YbYSZ ceramic layer, and transverse and vertical cracks induced by poor fracture toughness of doped ceramic are probably main cause of TBC failure. 4.5Yb4YSZ TBCs remained intact during the first 2000 h of cyclic oxidation, but cracks were then generated in ceramic layer. Moreover, thermal conductivities of 4.5Yb4YSZ, 6.5Yb2YSZ, and 8.5YbSZ ceramic coatings at 1200 ℃ were 1.32, 1.39, and 1.43 W·m−1·K−1, which are 20%, 15%, and 13% lower than that of 8YSZ prepared via the same process.
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