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Zr O2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．
The preparation of Y-TZP nano-ceramics by the superhigh pressure compaction was investigated. By applying superhigh pressure of about 3GPa, a green compact with a relative density of about 60% can be obtained, 13% higher than that by a normal cold isostatic press of 450MPa. The sintering ability of this green compact is so good that it can be sintered to 99%dense at a very low temperature of 1050℃. The relative high density of the green compact rather than the small pore size makes the sintering ability excellent . Y-TZP nano-ceramics having the grain size of about 80nm were obtained when sintered at 1050℃ for 5h after CIP of 3GPa.
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