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 1300℃, the coated powder was sintered to higher density
by means of transient viscous sintering. With increasing temperature, SiO2 reacted with ZrO2 to form ZrSiO4. ZrSiO4/3Y-TZP ceramic with an average
grain size of 350nm was obtained when the coated powder was hot-pressed at 1500℃ for 1h. It was suggested that SiO2 layer made greater contributions to the
formation of the fine-grained ZrSiO4/3Y-TZP composite.
参考文献
| [1] | 郭景坤(GUO Jing-Kun). 无机材料学报(Journal of Inorganic Materials)，1995, 10 (1): 27--31. [2] Sacks M D, et al. J. Am. Ceram. Soc., 1991, 74: 2428--2432. [3] Shiwei Wang , et al. Mater. Lett., 1996, 28: 43--46. [4] 施鹰，高性能锆英石基复相陶瓷制备科学的研究. [博士论文]. 上海: 中国科学院上海硅酸盐研究所, 1995. [5] 张宗涛, 等. 材料科学进展，1993, 7: 546--552. [6] Phase Diagrams for Ceramists, Fig. 2388. |
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