Ba_(1-x)Sr_xAl_2Si_2O_8体系环境障碍涂层材料在1000℃空气环境下的抗熔盐腐蚀性能研究

Research on Molten Salt Corrosion Resistance Behavior of Barium-Strontium Aluminosilicates Environmental Barrier Coating at 1000 ℃ in Air

采用溶胶-凝胶法制备了3种不同钡锶物质的量比的Ba1-xSrxAl2Si2O8(BSAS)体系粉体材料,其钡、锶物质的量比分别为1∶0、0.75∶0.25、0∶1。将烧结得到的BSAS块体材料表面喷涂(8.5±0.2)mg/cm2的Na2SO4后,置于1000℃空气环境中进行熔盐腐蚀实验,研究其抗熔盐腐蚀性能。根据样品质量随腐蚀时间的变化,结合X射线衍射(XRD)和扫描电镜形貌分析(SEM)等结果,揭示其抗熔盐腐蚀机理。结果表明,B0.75S0.25AS腐蚀100h后质量变化最小,XRD分析其成分未发生明显变化,说明B0.75S0.25AS在1000℃时的抗熔盐腐蚀性能优于其它物质的量比的BSAS材料。

The Bal-xSrxA12Si208 （BSAS） powders with different molar ratio of barium to strontium were pre- pared by sol-gel method. The molar ratios of Ba to Sr were 1 ： 0, 0. 75 ： 0. 25, 0 ： 1, respectively. Then the sintered BSAS bulk materials sintering with a concentration of （8. 51-0. 2） mg/cm2 NazSO4 on their surfaces were used in the corrosion test at 1000℃ in air. The weight change as a function of the corrosion time was recorded. The phases of the as-prepared and corroded samples were observed by X-ray diffraction （XRD）. And the microstructures of the corroded samples were investigated by scanning electron microscopy （SEM）. The results showed that the weight change of Ba0. 75 Sr0. 2s AS was minimum after 100 h corrosion. XRD results demonstrated that its composite was constant after corrosion. It indicated that the B.0.75 So. 25 AS had a better molten salt corrosion resistance than the others.