This work systematically studies the coordination of structural and mechanical properties of cBN composites by exploring the effects of cBN particle size distribution and holding time on the phase component, microstructure and mechanical properties under high-temperature and high-pressure (HPHT) condition. According to particle dense packing theory, four cBN particle size gradations were selected based on Gaussian Fitting. Experimental results show that the composite with the mixed particle size gradation of G1 possessed the uniform microstructure and high relative density, thus presented excellent mechanical properties. The compact framework formed by the synergistic stacking effect of large and small-size particles in composite improved the material performance. CBN composite with 110 s holding time displayed the perfect densification process and properties. The research provided a theoretical basis for low-cost preparation and applications of cBN composites.

本工作通过探索 cBN 粒径分布和保温时间对高温高压 (HPHT) 条件下的相组分、微观结构和力学性能的影响，系统地研究了 cBN 复合材料的结构和力学性能的协调性。根据粒子致密堆积理论，基于高斯拟合选择了四种cBN粒度级配。实验结果表明，混合粒度级配G1的复合材料具有均匀的显微组织和较高的相对密度，具有优异的力学性能。复合材料中大小颗粒协同堆积作用形成的致密骨架提高了材料性能。保温时间为 110 s 的 CBN 复合材料显示出完美的致密化过程和性能。该研究为cBN复合材料的低成本制备和应用提供了理论依据。