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研究了用超高压成型制备Ｙ－ＴＺＰ纳米陶瓷的新方法．通过采用新的成型方法，在５０００吨六面顶压机上实现了高达３ＧＰａ的超高压成型，获得相对密度达６０％的３ｍｏｌ％Ｙ２Ｏ３－ＺｒＯ２陶瓷素坯，比在４５０ＭＰａ下冷等静压成型所得素坯的密度高出１３％．这种超高压成型所得素坯具有极佳的烧结性能，可在１０５０～１１００℃下经无压烧结致密化．研究表明，这种素坯烧结性能好的主要原因是素坯的相对密度比较高，从而大大增加了物质的迁移通道．由于烧结温度极低，有利于制备ＺｒＯ２晶粒尺寸＜１００ｎｍ的纳米陶瓷。在１０５０℃／５ｈ的条件下，可烧结得到相对密度达 ９９％以上的 Ｙ－ＴＺＰ纳米陶瓷，平均晶粒仅为 ８０ｎｍ．
A new method of preparing Y-TZP nano-ceramic by ultra-high pressure molding was studied. Through the adoption of the new molding method, UHP molding of up to 3 GPa was achieved on a 5000-ton hexagonal top press to obtain a 3 mol% Y2O3-ZrO2 ceramic whiteware with a relative density of 60%, which was lower than that at 450 MPa cold isostatic pressing The density of the resulting green is 13% higher. This ultra-high pressure molding obtained from the element has excellent sintering properties, can be 1050 ~ 1100 ℃ by pressureless sintering densification. The research shows that the main reason for the good sinter performance is that the relative density of the slab is relatively high, which greatly increases the material migration path. Due to the extremely low sintering temperature, the preparation of nano-ceramic with ZrO2 crystal size less than 100nm is favorable. Under the condition of 1050 ℃ / 5h, the Y-TZP nano-ceramic with the relative density of more than 99% can be sintered with the average grain size of only 80nm.