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以纳米Al2O3和纳米ZrO2以及微米级W、Cr和Ni粉为原料,采用热压烧结工艺制备了Al2O3/ZrO2复相金属陶瓷模具材料。分别采用急冷-强度法和压痕-急冷法研究了烧结样品的抗热震性能。结果表明,当纳米Al2O3添加量为35 wt%,ZrO2为10 wt%、W为20 wt%、Cr为20 wt%以及Ni为15 wt%时,所制备的复相金属陶瓷模具材料性能最佳,其热震临界温度为510℃,在400℃热震循环50次后裂纹扩展值为1.5 mm。
The Al2O3 / ZrO2 multi-phase cermet mold material was prepared by hot-pressing sintering process using nano-Al2O3 and nano-ZrO2 and micron-sized W, Cr and Ni powders as raw materials. The thermal shock resistance of sintered samples was studied by means of rapid cooling - strength method and indentation - rapid cooling method respectively. The results show that when the amount of nano-Al2O3 is 35 wt%, ZrO2 is 10 wt%, W is 20 wt%, Cr is 20 wt% and Ni is 15 wt%, the prepared multi-phase cermet mold material has the best performance , The critical temperature of thermal shock is 510 ℃, the crack propagation value is 1.5 mm after heat shock cycle of 400 ℃ for 50 times.