多孔氮化硅表面γ-Y_2Si_2O_7陶瓷涂层的制备及抗热震性能  

Prepration and thermal shock resistance property of γ-Y_2Si_2O_7 ceramic coating on surface of porous silicon nitride

作　　者：范星宇[1] 王红洁[1] 温江波[1] 牛敏[1] 

机构地区：[1]西安交通大学金属材料强度国家重点实验室,西安710049

出　　处：《复合材料学报》2016年第5期1097-1103,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51472198);陕西省科技统筹创新工程计划(2015KTCL01-13)

摘　　要：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。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.

关 键 词：多孔氮化硅陶瓷 封孔涂层 γ-Y2 Si2O7涂层 熔渗法 抗热震 

分 类 号：TB321[一般工业技术—材料科学与工程]