采用浆料喷涂与高温熔渗结合的方法，以γ-Y2 Si2 O7和Y2 O3-Al2 O3-SiO2三元氧化物粉体为原料，在多孔 Si3 N4表面制备致密γ-Y2 Si2 O7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Al2 O3物质的量之比较高时，涂层为致密γ-Y2 Si2 O7层和过渡层的双层结构；SiO2与 Al2 O3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。
Usingγ-Y2 Si2 O7 and Y2 O3-Al2 O3-SiO2 ternary oxide powders as raw materials,a denseγ-Y2 Si2 O7 ce-ramic coating was fabricated on surface of porous Si3 N4 by using a combined method of slurry spraying and high-temperature melt infiltration.The effects of the composition of raw materials and sintering temperature on struc-ture,organization and thermal shock resistance of coating were studied systematically by XRD and SEM detection methods.The results show that a coating with double-layer structure of denseγ-Y2 Si2 O7 layer and transition layer is obtained when amount of substance ratio of SiO2 and Al2 O3 is high.A single-layer structure is obtained when amount of substance ratio of SiO2 and Al2 O3 is low.The coating with double-layer structure has a better thermal shock resistance property than the coating with single-layer structure.
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