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本文用不同水解时间辅以氨水沉淀制备了不同颗粒尺寸的纳米（９ｎｍ）ＺｒＯ２（Ｙ２Ｏ３）粉体。以其为增韧相，在高温（１３５０℃）超高压（５ＧＰａ）条件下烧结ＺｒＯ２（Ｙ２Ｏ３）＋ＳｉＣ＋金刚石超硬复相陶瓷，用ＴＥＭ、ＳＥＭ、ＸＲＤ、冲击韧性测定和磨耗比测定研究了ＺｒＯ２（Ｙ２Ｏ３）颗粒形状特征及对超硬复相陶瓷相结构及机械性能的影响。结果表明，ＺｒＯ２（Ｙ２Ｏ３）制备的水解时间≥５０ｈ，ＺｒＯ２（Ｙ２Ｏ３）颗粒均一，在复相陶瓷内均一分布，以１００％ｔ相存留，断裂过程中ｔ→ｍ转变量≥２０ｖｏｌ％，使超硬复相陶瓷具备较高韧性及耐磨性。
In this paper, nano-sized (9nm) ZrO2 (Y2O3) powders with different particle sizes were prepared by aqueous ammonia precipitation with different hydrolysis time. ZrO2 (Y2O3) + SiC + diamond composites were sintered at high temperature (1350 ℃) under high pressure (5GPa) with toughening phase. The effects of ZrO2 (Y2O3) Particles and Their Influences on Phase Structure and Mechanical Properties of Superhard Composites. The results show that the ZrO2 (Y2O3) preparation time is more than 50h, the ZrO2 (Y2O3) particles are homogenous and uniformly distributed in the multiphase ceramics with 100% t phase, and the transition amount of t → m is more than or equal to 20vol% Hard multi-phase ceramic with higher toughness and wear resistance.