为提高ZrO2基复合材料硬度,采用热压烧结法制备了TiC0.7N0.3/ZrO2复合材料,并研究了TiC0.7N0.3颗粒增强相对复合材料的物相组成、微观结构和力学性能的影响.结果表明:TiC0.7N0.3的添加具有稳定四方相ZrO2(t-ZrO2)的作用,能增加TiC0.7N0.3/ZrO2复合材料中t-ZrO2的含量,提高断裂韧性.随着热压烧结温度的升高和TiC0.7N0.3含量的增加,复合材料的硬度升高.1 400℃下热压烧结时,TiC0.7N0.3发生部分分解,分解的N与被还原的ZrO2反应生成ZrN,提高了复合材料的硬度.1 400℃下热压烧结后的35wt％ TiC07N0.3/ZrO2复合材料的相对密度达99.9％,维氏硬度达17 GPa.而1 300℃下热压烧结后,复合材料断裂韧性较高,为6.48 MPa·m1/2.研究结果为TiC0.7N0.3/ZrO2复合材料的组织控制及性能改进提供了参考.
参考文献
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