采用真空热压工艺, 在烧结温度1750℃、烧结压力32MPa、保温时间5min的工艺条件下制备了添加不同量纳米六硼化钙（CaB6）粉末的微米烧结体, 研究了纳米粒子含量对CaB6烧结体形貌组织和力学性能的影响. 纳米粉末加入量为10wt%纳米/微米复合陶瓷的致密度和力学性能最佳, 硬度、弯曲强度和断裂韧性分别为92.6 HRA、331.7MPa和3.06MPa·m1/2, 优于微米烧结体和添加镍作为烧结助剂的烧结体. 纳米粒子对微米颗粒晶界的填充和在复合烧结体中形成的“内晶型”晶粒结构是提高复合陶瓷致密度和力学性能的主要原因.
Nano/Micron Calcium Hexaboride (CaB6) composite ceramics with different CaB6 nanopowder additions were prepared under 1750℃, 32MPa for 5min in vacuum. Influences of CaB6 nanopowders on morphology and mechanical properties of sintered bodies were investigated. Composite ceramic with 10wt% CaB6 nanopowder addition has the highest compactness degree and mechanical properties, whose hardness, bending strength and fractural toughness are 92.6 HRA, 331.7MPa and 3.06MPa·m1/2, respectively, better than those of CaB6 ceramics without nanopowder adding or those of reinforced by Ni as sintering additive. The proper amount of nano-particles filled in the micron grain boundaries and the formation of “inner crystal” result in the improvement of compactness and mechanical properties for the CaB6 sintered body.
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