【在线发表】[2015-0761]多孔氮化硅表面γ-Y2Si2O7陶瓷涂层的制备及抗热震性能

《复合材料学报》优先在线发表论文。

摘要：采用浆料喷涂与高温熔渗结合的方法，以γ-Y2Si2O7及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、SEM的测试方法系统研究原料配比对涂层结构、组织和抗热震性能的影响。结果表明，SiO2:Al2O3摩尔比较高时，涂层为双层结构——致密γ-Y2Si2O7层和过渡层；SiO2:Al2O3摩尔比较低时，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。

关键词：多孔氮化硅陶瓷；封孔涂层；γ-Y2Si2O7涂层；熔渗法；抗热震

Abstract:Using γ-Y2Si2O7 powders and Y2O3-Al2O3-SiO2 powders, a dense γ-Y2Si2O7 coating was fabricated on the surface of porous substrate by high-temperature melt infiltration method. The effect of the composition of YAS powders and sintering temperature on microstructure and thermal shock resistance of γ-Y2Si2O7 coating was studied systematically by XRD, SEM detection methods. The results show that a double-layer coating with dense γ-Y2Si2O7 surface and inner transition layer is obtained when SiO2:Al2O3 ratio is high. A single-layer coating is obtained when SiO2:Al2O3 ratio is low. The coating with double-layer structure has a better thermal shock resistance than the coating with single-layer structure.

Keywords:  porous silicon nitride; sealing coating; γ-Y2Si2O7 coating; melt infiltration method; thermal shock resistance

作者：范星宇等，西安交通大学金属材料强度国家重点实验室，西安

通讯作者：王红洁，西安交通大学金属材料强度国家重点实验室，西安

全文详见中国知网学术期刊优先数字出版。