成型方法对纳米二氧化硅陶瓷烧结行为及微观结构的影响  

Influence of Molding Methods on the Sintering Behavior and Microstructure of Silica Nanoceramics

作　　者：卓磊[1] 陈文革[1] 张洋[1] 赵珊珊[1] 辛菲[1] 

机构地区：[1]西安理工大学材料科学与工程学院,西安710048

出　　处：《人工晶体学报》2014年第9期2313-2318,共6页Journal of Synthetic Crystals

基　　金：西安市科技计划项目(CXY1124(1));西安市城建委基金

摘　　要：以二氧化硅纳米粉为原料通过流延成型和模压成型两种不同成型方法制备纳米二氧化硅陶瓷,用X射线衍射仪对原料粉和陶瓷进行物相分析,用场发射扫描电子显微镜分析陶瓷微观形貌。结果表明,用流延成型坯体颗粒在1050℃时出现熔融现象并且开始形成晶格不完整的α-方石英相;而模压成型坯体颗粒在950℃时出现非常明显的熔融现象,并晶化生成晶格完整的α-方石英相,说明纳米氧化硅的烧结温度不仅远低于传统烧结温度,而且其晶化反应直接生成α-方石英结构,不会出现α-石英和鳞石英。同时用微晶学说解释了纳米氧化硅烧结过程的相变。Silica nanoceramics were prepared by tape-casting and compression molding with the raw material of silica nanopowder.The phases of silica nanopowder and nanoceramics were analyzed by X-ray diffraction（ XRD）,whereas their microstructures were studied by scanning electron microscope（ SEM）.The results show that,when the ceramics were prepared by tape-casting,the particles in the ceramic body melted and became changing into α-cristobalite at 1050 ℃,but it had an imperfect crystal structure.In compression forming method,the body particles fused obviously at 950 ℃ and crystallized into α-cristobalite which had a perfect crystal structure.As the sintering temperature of silica nanoceramics were much lower than traditional silica ceramics,what ＇s more,the nanopowder in the ceramic body was changing into α-cristobalite rather than α-quartz and tridymite.The phase transformation during the sintering process was explained by the crystallite theory.

关 键 词：二氧化硅 流延成型 模压成型 熔融 Α-方石英 

分 类 号：TB321[一般工业技术—材料科学与工程]