Effect of nano-diamond on mechanical properties of polycrystalline cubic boron nitride
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摘要: 以立方氮化硼（cBN）粉体为原材料，Al粉和Si粉为结合剂，纳米金刚石为添加剂，在5.5 GPa和1500 ℃下高温高压烧结制备了聚晶立方氮化硼（PcBN），研究了纳米金刚石质量分数对PcBN的物相组成、微观结构、密度、硬度、断裂韧性和磨耗比的影响。结果表明：纳米金刚石的加入对PcBN的性能有很大影响。当金刚石质量分数为5%时，PcBN的相对密度达到最大值（98.5%）；随着纳米金刚石含量的增加，PcBN样品的维氏硬度、断裂韧性和磨耗比先升高后下降。当纳米金刚石质量分数为5%时，PcBN的硬度、断裂韧性和磨耗比达到最高值，分别为47 GPa、4.89 MPa·m1/2和6350。Abstract: Polycrystalline cubic boron nitride (PcBN) was sintered at the high temperature of 1500 ℃ under the pressure of 5.5 GPa, using cubic boron nitride (cBN) powders as the raw materials, Al powders and Si powders as the binders, and nano-diamond as the additive. The effects of nano-diamond mass fraction on the phase composition, microstructure, density, hardness, fracture toughness, and wear ratio of PcBN were investigated. The results show that, the addition of nano-diamond has the great influence on the performance of PcBN. When the diamond mass fraction is 5%, the relative density of PcBN reaches the maximum as 98.5%. Vickers hardness, fracture toughness, and wear ratio of the PcBN samples increase and then drop as the nano-diamond content increases. When the nano-diamond mass fraction is 5%, the hardness, fracture toughness, and wear ratio of PcBN reach the highest values, which are 47 GPa, 4.89 MPa·m1/2, and 6350, respectively.
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图 1 添加不同质量分数纳米金刚石PcBN样品X射线衍射图谱
Figure 1. XRD patterns of the PcBN samples added by nano-diamond with the different mass fraction
图 2 添加不同质量分数纳米金刚石PcBN样品显微形貌：（a）0%；（b）5%；（c）10%；（d）15%；（e）20%
Figure 2. SEM images of the PcBN samples added by nano-diamond with the different mass fraction: (a) 0%; (b) 5%; (c) 10%; (d) 15%; (e) 20%
图 3 纳米金刚石质量分数对PcBN密度的影响
Figure 3. Effect of the nano-diamond mass fraction on the dendity of PcBN samples
图 4 纳米金刚石质量分数对PcBN硬度和断裂韧性的影响
Figure 4. Effect of the nano-diamond mass fraction on the hardness and fracture toughness of the PcBN samples
图 5 纳米金刚石质量分数对PcBN磨耗比的影响
Figure 5. Effect of nano-diamond content on the abrasive ratio of PcBN samples
表 1 PcBN复合材料原料组分（质量分数）
Table 1. Raw material components of the PcBN composite materials
% 试样编号 cBN 纳米金刚石 Al Si 1 90.0 0 9.00 1.00 2 85.5 5 8.55 0.95 3 81.0 10 8.10 0.90 4 76.5 15 7.65 0.85 5 72.0 20 7.20 0.80 
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