Effect of CNTs on properties of PcBN composites with mixed particle size
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摘要: 为提高高温高压制备的聚晶立方氮化硼(PcBN)复合材料的性能,以颗粒尺寸分别为0~0.5 μm和0.5~1.0 μm的混合粒径立方氮化硼(cBN)为原材料,Al-Ti-Al2O3为结合剂,加入不同质量分数的碳纳米管,在高温高压条件下烧结制备PcBN复合材料,研究碳纳米管质量分数对PcBN复合材料结构和性能的影响。结果表明:添加碳纳米管后,PcBN和碳纳米管间没有发生化学反应,碳纳米管以增强体的形式存在于复合材料内部;复合材料较致密,碳纳米管的添加使PcBN的相对密度先增大后减小。当碳纳米管添加质量分数为1.5%时,PcBN的相对密度有最大值97.9%,同时 PcBN有最大的显微硬度和断裂韧性,分别为3892 HV和6.82 MPa·m1/2;当碳纳米管的添加质量分数为1.0%时,PcBN有最大的抗弯强度和磨耗比,分别为584 MPa和6873。碳纳米管拔出和桥连作用提高了PcBN复合材料的力学性能。Abstract: To improve the performance of PcBN composites prepared under high temperature and high pressure, mixed cBN particle sizes ranging from 0 to 0.5 μm and 0.5 to 1.0 μm were used as the raw material, Al-Ti-Al2O3 was used as the binder and the carbon nanotubes with different contents were added. The PcBN composites were prepared by sintering under high temperature and high pressure conditions. The effect of carbon nanotube content on the structure and properties of PcBN composites was investigated. The results show that there is no chemical reaction between PcBN and carbon nanotubes after the addition of carbon nanotubes, and the carbon nanotubes exist in the form of reinforcement inside the composite. The composite material is relatively dense, and the relative density of PcBN increases first and then decreases with the addition of carbon nanotubes. When the mass fraction of carbon nanotubes added is 1.5%, the relative density of PcBN reaches its maximum value of 97.9%, while PcBN has the maximum microhardness and fracture toughness of 3 892 HV and 6.82 MPa·m1/2, respectively. When the mass fraction of carbon nanotubes added is 1.0%, PcBN has the maximum bending strength and wear ratio, which are 584 MPa and 6 873 MPa, respectively. The pull-out and bridging effects of carbon nanotubes improve the mechanical properties of PcBN composites.
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表 1 实验配方
Table 1. Experimental formula
编号 cBN质量分数
ω1 / %结合剂质量分数
ω2 / %CNTs质量分数
ω3 / %1 70.0 30.0 0 2 69.5 30.0 0.5 3 69.0 30.0 1.0 4 68.5 30.0 1.5 5 68.0 30.0 2.0 -
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