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Volume 45 Issue 1
Mar.  2025
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Article Navigation >  Diamond & Abrasives Engineering  > 2025  >  45(1): 31-36
TANG Lihui, XIAO Changjiang, ZHANG Qunfei, ZHENG Haoyu, LI Zhengxin. Effect of TiN-Al system binder ratio on structure and properties of PcBN[J]. Diamond & Abrasives Engineering, 2025, 45(1): 31-36. doi: 10.13394/j.cnki.jgszz.2023.0284
Citation: TANG Lihui, XIAO Changjiang, ZHANG Qunfei, ZHENG Haoyu, LI Zhengxin. Effect of TiN-Al system binder ratio on structure and properties of PcBN[J]. Diamond & Abrasives Engineering, 2025, 45(1): 31-36. doi: 10.13394/j.cnki.jgszz.2023.0284
shu

Effect of TiN-Al system binder ratio on structure and properties of PcBN

doi: 10.13394/j.cnki.jgszz.2023.0284

  • School of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450001, China

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  • Received Date: 2023-12-29
  • Accepted Date: 2024-04-23
  • Rev Recd Date: 2024-04-12
    • Available Online: 2025-03-24
    Abstract
  •   Objectives  Al and TiN are commonly used components in PcBN synthesis under high temperature and high pressure. But the existing literature studying the TiN-Al bonding system always focuses on the single property variation, such as relative density, hardness, fracture toughness, impact resistance or abrasion resistance, rather than the comprehensive performance when analyzing the samples. In this paper, the TiN-Al ratio and its effect on the structure and the comprehensive performance of PcBN is explored.  Methods  The raw materials for the experiment are cBN powder sized 0.5-1.0 µm and binders of TiN powder sized of 2-10 µm and Al powder sized 1-2 µm. The high-temperature and high-pressure preparation conditions are provided by a hydraulic cubic press. The sintering pressure is 5.5 GPa and the sintering temperature is 1400 ℃, with a holding time of 10 minutes to obtain the PcBN sample. After grinding, polishing and other processing steps, the material properties are tested. The phase is analyzed using an X-ray diffractometer. The binding of cBN particles with the binder and its microscopic morphology are observed using a scanning electron microscope. The actual density, the microhardness and the fracture toughness of the samples are tested separately. The wear ratio of the specimens are measured under the following conditions: an 80-mesh grit SiC grinding wheel for counter grinding, axial force of 300 N and spindle speed of 300 r/min. The wear ratio of the samples is quantified by the ratio of the wheel wear to the PcBN wear.  Results  It is observed that the prepared PcBN consists of 4 phases: BN, AlN, TiN, and TiB2. As the proportion of Al increases, the diffraction peak intensities of AlN and TiB2 gradually become stronger while that of TiN gradually decreases. When the content of Al increases, the number of pores decreases to zero and the material become denser. The relative density of the samples reaches its maximum value of 99.02% at 9% TiN and 16% Al. The hardness, the fracture toughness and the abrasion resistance of PcBN increase initially and then decrease as TiN content increases.  Conclusions  The binding agents TiN and Al react with cBN, forming four phases: BN, TiB2, TiN and AlN. As the Al ratio increases, the proportions of AlN and TiB2 increase while that of TiN decreases. The comprehensive performance of PcBN is the best when the mass ratio of TiN∶Al in the binding agent is 9∶16, leading to uniform distribution of cBN and binder and ensuring a dense PcBN sintered body. At this condition, the relative density, the Vickers hardness, the fracture toughness and the wear ratio of the PcBN sample reach the maximum values, which are 99.02%, 4664 HV, 6.60 MPa·m1/2 and 7340, respectively.

     

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