【摘要】 在高温高压条件下制备了聚晶立方氮化硼（PcBN）复合材料。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、能谱仪（EDS）等研究了结合剂配比和立方氮化硼（cBN）粒度对PcBN复合材料的成分、微观结构、显微硬度和磨耗比的影响。实验结果表明：在压力5.5 GPa，温度1 400℃，保温10 min的烧结条件下，当V(TiN_0.3)∶V（AlN）=70∶30时，PcBN复合材料性能较为优异，硬度最高达到22.7 GPa，磨耗比达到149.2；当PcBN复合材料中cBN粒度组合为V（0.5～1μm）∶V（2～5μm）∶V（5～10μm）=3∶5∶2时，颗粒之间的堆积密度达到最高，性能也达到最优。更多还原

【Abstract】 Polycrystalline cubic boron nitride composites were prepared under high-temperature and high-pressure conditions. The effects of bonding agent ratio and cBN particle size on the composition, microstructure, microhardness, and abrasive ratios of the PcBN composites were investigated using X-ray diffraction(XRD), field scanning electron microscopy(SEM), and energy dispersive spectroscopy(EDS). The experimental results showed that the PcBN composites performed better under sintering conditions of 5.5 GPa, 1 400 ℃, and a 10-minute holding time, achieving a hardness of up to 22.7 GPa and an abrasion ratio of 149.2 at V(TiN0.3)∶V(AlN)=70∶30. Moreover, when the particle size combination of cBN in PcBN composites is(0.5～1) μm:(2～5) μm:(5～10) μm = 3:5:2, the packing density between particles reaches its peak, resulting in optimal performance.更多还原