论文部分内容阅读
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%TiC0.7N0.3/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。
In order to improve the hardness of ZrO2-based composites, TiC0.7N0.3 / ZrO2 composites were prepared by hot-pressing sintering method and the effects of phase composition, microstructure and mechanical properties of TiC0.7N0.3 particles reinforced composites were studied . The results show that the addition of TiC0.7N0.3 has the effect of stabilizing tetragonal ZrO2 (t-ZrO2), increasing the content of t-ZrO2 in TiC0.7N0.3 / ZrO2 composites and increasing the fracture toughness. With the hot pressing temperature and TiC0.7N0.3 content increased, the hardness of composites increased. 1 400 ℃ under hot-pressing sintering, TiC0.7N0.3 partial decomposition, decomposed N and reduced ZrO2 reaction of ZrN, increased the hardness of the composite material. The relative density of hot-pressed 35wt% TiC0.7N0.3 / ZrO2 composites sintered at 400 ℃ reached 99.9% and the Vickers hardness reached 17 GPa. After hot pressing at 1 300 ℃, the fracture toughness of the composites is high, which is 6.48 MPa · m1 / 2. The results provide a reference for the microstructure control and performance improvement of TiC0.7N0.3 / ZrO2 composites.