由SiO_2/3Y-TZP包裹复合粉体制备ZrSiO_4/3Y-TZP细晶陶瓷  

Fine-grained ZrSiO_4/3Y-TZP Ceramic Hot-pressed from 3Y-TZP Powders Coated with SiO_2 Layer

作　　者：王士维[1] 荣天君[1] 黄校先[1] 郭景坤[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》2002年第2期283-287,共5页Journal of Inorganic Materials

基　　金：教盲部留学回国人员科研启动经费

摘　　要：对湿化学法制备的ＳｉＯ２／３Ｙ－ＴＺＰ包裹复合粉体进行了热压烧结研究，并利用Ｘ射线衍射和透射电镜表征了烧结体的物相和显微结构．在低于１３００℃，复合粉体发生瞬时粘性烧结，材料密度迅速提高；随着烧结温度的升高，ＳＩＯ２和ＺｒＯ２发生反应生成ＺｒＳｉＯ４．在１５００℃热压条件下，制备了平均晶粒尺寸为３５０ｎｍ的ＺｒＳｉＯ４／３Ｙ－ＴＺＰ细晶复相材料．我们认为，在烧结过程中形成的第二相ＺｒＳｉＯ４，特别是ＳｉＯ２包裹层对抑制基体晶粒长大起主要作用．3Y-TZP powder coated with SiO2 layer, prepared by the wet chemical method, was hot-pressed to fine-grained ZrSiO4/3Y-TZP composite. The phases and microstructure of the sintering bodies were characterized by X-ray diffraction and TEM. Below 1300degreesC, the coated powder was sintered to higher density by means of transient viscous sintering. With increasing temperature, Sio(2) reacted with ZrO2 to form ZrSiO4. ZrSio(4)/3Y-TZP ceramic with an average grain size of 350nm was obtained when the coated powder was hot-pressed at 1500degreesC for 1h. It was suggested that SiO2 layer made greater contributions to the formation of the fine-grained ZrSiO4/3Y-TZP composite.

关 键 词：包裹复合粉体 制备 ZrSiO4/3Y-TZP 细晶陶瓷 热压 湿化学法 

分 类 号：TQ174[化学工程—陶瓷工业]