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- 2016
多孔氮化硅表面γ-Y2Si2O7陶瓷涂层的制备及抗热震性能
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Abstract:
采用浆料喷涂与高温熔渗结合的方法,以γ-Y2Si2O7和Y2O3-Al2O3-SiO2三元氧化物粉体为原料,在多孔Si3N4表面制备致密γ-Y2Si2O7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-Y2Si2O7层和过渡层的双层结构;SiO2与Al2O3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。 Using γ-Y2Si2O7 and Y2O3-Al2O3-SiO2 ternary oxide powders as raw materials, a dense γ-Y2Si2O7 ceramic coating was fabricated on surface of porous Si3N4 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 structure, 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 dense γ-Y2Si2O7 layer and transition layer is obtained when amount of substance ratio of SiO2 and Al2O3 is high. A single-layer structure is obtained when amount of substance ratio of SiO2 and Al2O3 is low. The coating with double-layer structure has a better thermal shock resistance property than the coating with single-layer structure. 国家自然科学基金(51472198);陕西省科技统筹创新工程计划(2015KTCL01-13)
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