Effect of component design and optimization on the organization and properties of PcBN composites
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摘要: 在高温高压条件下制备了聚晶立方氮化硼复合材料。采用x射线衍射(XRD)、场扫描电子显微镜(SEM)、能谱(EDS)等研究了结合剂配比和cBN粒度对PcBN复合材料的成分、微观结构、显微硬度、致密度和磨耗比的影响。实验结果表明:在5.5 GPa,1400 ℃,保温10 min的烧结条件下,在TiN0.3: AlN=7: 3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(0.5~1) μm: (2~5) μm: (5~10) μm=3: 5: 2时,颗粒之间的堆积密度达到最高,性能也达到最优。Abstract: The polycrystalline cubic boron nitride composites were prepared under high temperature and pressure conditions. The effects of bonding agent ratio and cBN particle size on the composition, microstructure, microhardness, density and abrasive ratios of PcBN composites were investigated by X-ray diffraction (XRD), field scanning electron microscopy (SEM) and energy spectroscopy (EDS). The experimental results showed that the PcBN composites performed better under the sintering conditions of 5.5 GPa, 1400 ℃, and 10 min holding time, with a hardness of up to 22.7 GPa and an abrasion ratio of 149.2 at TiN0.3: AlN=7: 3. 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 the highest and the performance is optimal.
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