B₄C-TiB₂-SiC composites were fabricated via hot pressing using ball milled B₄C, TiB₂, and SiC powder mixtures as the starting materials. The impact of ball milling on the densification behaviors, mechanical properties, and microstructures of the ceramic composites were investigated. The results showed that the refinement of the powder mixtures and the removal of the oxide impurities played an important role in the improvement of densification and properties. Moreover, the formation of the liquid phases during the sintering was deemed beneficial for densification. The typical values of relative density, hardness, bending strength, and fracture toughness of the composites reached 99.20%, 32.84 GPa, 858 MPa and 8.21 MPa m^1/2, respectively. Crack deflection, crack bridging, crack branching, and microcracking were considered to be the potential toughening mechanisms in the composites. Furthermore, numerous nano-sized intergranular/intragranular phases and twin structures were observed in the B₄C-TiB₂-SiC composite.

使用球磨的B ₄ C，TiB ₂和SiC粉末混合物作为起始原料，通过热压制备B ₄ C-TiB ₂ -SiC复合材料。研究了球磨对陶瓷复合材料的致密化行为，力学性能和微观结构的影响。结果表明，粉末混合物的细化和氧化物杂质的去除在提高致密性和性能方面起着重要作用。此外，在烧结过程中液相的形成被认为有利于致密化。复合材料的相对密度，硬度，弯曲强度和断裂韧性的典型值分别达到99.20％，32.84 GPa，858 MPa和8.21 MPa m^1/2。裂纹变形，裂纹桥接，裂纹分支和微裂纹被认为是复合材料中潜在的增韧机制。此外，在B ₄ C-TiB ₂ -SiC复合材料中观察到许多纳米级的晶间/晶间相和孪晶结构。