Abstract：Si/3Al2O3·2SiO2+BSAS(1-xBaO-xSrO-Al2O3-2SiO2,0≤x≤1)/Yb2SiO5 environmental barrier coating(EBC) was prepared, based on Cf/SiC substrate by electron beam physical vapor deposition(EB-PVD)and plasma spraying(PS). High temperature oxidation behavior of EBC was studied at 1400℃ constant temperature environment. The results indicate that the mass loss of Cf/SiC specimens with EBC coating occurs when exposure to 80h under oxidation experimental conditions. Ba and Al contained in the 3Al2O3·2SiO2+BSAS middle layer diffuse outward to Yb2SiO5 top coating, then two new phases of BaO2 and Al2Yb4O9 are formed. The early sintering and volume shrinkage of BSAS at 1400℃, and the residual stresses induced by the mismatch of thermal expansion coefficients among mullite, all are the primary factors leading to the spallation of EBC.
贺世美, 熊翔, 何利民. 新型Yb2SiO5环境障涂层1400℃高温氧化行为[J]. 材料工程, 2015, 43(4): 37-41.
HE Shi-mei, XIONG Xiang, HE Li-min. High Temperature Oxidation Behavior of New Yb2SiO5 Environmental Barrier Coatings at 1400℃. Journal of Materials Engineering, 2015, 43(4): 37-41.
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