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- 2015
TiC0.7N0.3增强ZrO2基复合材料的微观结构及力学性能
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Abstract:
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。 To enhance the hardness of ZrO2 matrix composites, TiC0.7N0.3/ZrO2 composites were fabricated by hot pressing method, and the effects of TiC0.7N0.3 particle reinforcing phase on the phase composition, microstructure and mechanical properties of the composites were investigated. The results show that the addition of TiC0.7N0.3 has the effect to stabilize tetragonal ZrO2 (t-ZrO2), and can improve the t-ZrO2 content in TiC0.7N0.3/ZrO2 composites, thus improve the fracture toughness. With the hot pressing temperature and TiC0.7N0.3 content increasing, the hardness of composites increases. When hot pressing at 1 400 ℃, TiC0.7N0.3 decomposes partially, and the released N can react with reduced ZrO2 to form ZrN, which increases the hardness of composites. The relative density of 35wt% TiC0.7N0.3/ZrO2 composites after hot pressing at 1 400 ℃ exceeds 99.9% and Vickers hardness reaches 17 GPa. While the fracture toughness of composites is higher after hot pressing at 1 300 ℃, which is 6.48 MPa·m1/2. The conclusions provide references for microstructure controlling and improvement TiC0.7N0.3/ZrO2 composite properties. 国家科技重大专项(2012ZX04003-061)
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