通过燃烧合成工艺制备了TiB2-40%Cu(质量分数)基复合材料,对复合材料的反应热力学、相组成以及微观组织进行了研究.热力学计算结果表明TiB2是最稳定的相,中间相Ti-Cu化合物最终转变为TiB2相;XRD结果显示复合材料的相组成为TiB2相和Cu相,没有生成其他中间相;微观组织观察表明,合成产物组织致密,增强体TiB2陶瓷颗粒尺寸细小,形貌主要呈近等轴状和块状,Cu作为金属粘结剂将TiB2陶瓷颗粒相互连接在一起,Cu的存在促进了燃烧合成过程中材料的致密化行为.Cu的加入使TiB2-Cu基复合材料的致密度、弯曲强度和断裂韧性较TiB2纯陶瓷均有大幅度提高,材料的韧化机制为裂纹尖端塑性钝化机制.
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