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<p>By means of the grain size matching approach, cubic boron nitride (cBN) powders with grain sizes of 8, 3, 1, and 0.2&#xa0;μm were used as origin materials; polycrystalline cubic boron nitride (PcBN) composites were sintered by a high-temperature and high-pressure method. The effect of matching cBN powder on the properties of samples was systematically examined. The principal components of the prepared samples are cBN, TiN, AlN, TiB<sub>2</sub>, and CoN. During sintering, medium-sized particles can fill the gaps between coarse-sized particles, and the fine and ultrafine-sized particles can fill the medium-sized particles' gaps between particles; therefore, the microstructure became denser and the properties improved as the matching gradation of cBN with different particle sizes increased. All matched samples have superior properties compared to those with a single particle size. Sample B1, with the widest particle size distribution and appropriate particle size matching, possessed the optimal mechanical properties, and the relative density, flexural strength, Vickers hardness, fracture toughness, and abrasive ratio all reached the maximum value, which was 99.8%, 625&#xa0;MPa, 48.55&#xa0;GPa, 6.97&#xa0;MPa·M<sup>1/2</sup>, and 7532, respectively.</p>

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Enhanced Properties of PcBN Composites by Regulating the Particle Size Matching of cBN Powders

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Changjiang Xiao,
  • Xiang Li,
  • Haoyu Zheng,
  • Lihui Tang

摘要

By means of the grain size matching approach, cubic boron nitride (cBN) powders with grain sizes of 8, 3, 1, and 0.2 μm were used as origin materials; polycrystalline cubic boron nitride (PcBN) composites were sintered by a high-temperature and high-pressure method. The effect of matching cBN powder on the properties of samples was systematically examined. The principal components of the prepared samples are cBN, TiN, AlN, TiB2, and CoN. During sintering, medium-sized particles can fill the gaps between coarse-sized particles, and the fine and ultrafine-sized particles can fill the medium-sized particles' gaps between particles; therefore, the microstructure became denser and the properties improved as the matching gradation of cBN with different particle sizes increased. All matched samples have superior properties compared to those with a single particle size. Sample B1, with the widest particle size distribution and appropriate particle size matching, possessed the optimal mechanical properties, and the relative density, flexural strength, Vickers hardness, fracture toughness, and abrasive ratio all reached the maximum value, which was 99.8%, 625 MPa, 48.55 GPa, 6.97 MPa·M1/2, and 7532, respectively.