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采用浆料喷涂与高温熔渗结合的方法,以γ-Y_2Si_2O_7和Y_2O_3-Al_2O_3-SiO_2三元氧化物粉体为原料,在多孔Si_3N_4表面制备致密γ-Y_2Si_2O_7陶瓷涂层,采用XRD和SEM测试方法系统研究原料配比及烧结温度对涂层结构、组织和抗热震性能的影响。结果表明:SiO2与Al2O3物质的量之比较高时,涂层为致密γ-Y_2Si_2O_7层和过渡层的双层结构;SiO_2与Al_2O_3物质的量之比较低时,只能形成单层结构;双层结构涂层的抗热震性能优于单层结构涂层。
Y2Si2O7 and Y2O3-Al2O3-SiO2 ternary oxide powders were used as raw materials to prepare dense γ-Y_2Si_2O_7 ceramic coatings on porous Si_3N_4 surface by the combination of slurry spraying and high temperature infiltration. XRD and SEM methods were used The effect of raw material ratio and sintering temperature on the structure, microstructure and thermal shock resistance of the coating was systematically studied. The results show that the coating is a double-layered structure of dense γ-Y 2 Si 2 O 7 layer and transitional layer when the amount of SiO 2 to Al 2 O 3 is relatively high. When the amount of SiO 2 to Al 2 O 3 is relatively low, The thermal shock resistance of the structural coating is better than the single-layer structural coating.