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．
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.
参考文献
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