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Polycrystalline cubic boron nitride prepared with cubic-hexagonal boron nitride under high pressure and high temperature

机译:立方六方氮化硼在高温高压下制备的多晶立方氮化硼

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摘要

Polycrystalline cubic boron nitride (PcBN) compacts,using the mixture of submicron cubic boron nitride (cBN) powder and hexagonal BN (hBN) powder as starting materials,were sintered at pressures of 6.5-10.0 GPa and temperature of 1750 ℃ without additives.In this paper,the sintering behavior and mechanical properties of samples were investigated.The XRD patterns of samples reveal that single cubic phase was observed when the sintering pressure exceeded 7.5 GPa and hBN contents ranged from 20 vol.% to 24 vol.%,which is ascribed to like-internal pressure generated at grain-to-grain contact under high pressure.Transmission electron microscopy (TEM) analysis shows that after high pressure and high temperature (HPHT) treatments,the submicron cBN grains abounded with high-density nanotwins and stacking faults,and this contributed to the outstanding mechanical properties of PcBN.The pure bulk PcBN that was obtained at 7.7 GPa/1750 ℃possessed the outstanding properties,including a high Vickers hardness (~ 61.5 GPa),thermal stability (~ 1290 ℃ in air),and high density (~ 3.46 g/cm3).
机译:以亚微米立方氮化硼(cBN)粉和六方氮化硼(hBN)粉末的混合物为原料,将多晶立方氮化硼(PcBN)压制成型,在6.5-10.0 GPa的压力和1750℃的温度下烧结无添加剂。本文的样品的烧结行为和力学性能进行了研究。样品的X射线衍射图谱表明,当烧结压力超过7.5 GPa且hBN含量为20 vol。%至24 vol。%时,观察到单立方相。归因于在高压下晶粒与晶粒之间的接触所产生的内部压力。透射电子显微镜(TEM)分析显示,经过高压和高温(HPHT)处理后,亚微米cBN晶粒充满了高密度纳米孪晶并堆积7.7 GPa / 1750℃下获得的纯块状PcBN具有优异的性能,包括较高的维氏硬度硬度(〜61.5 GPa),热稳定性(〜空气中〜1290℃)和高密度(〜3.46 g / cm3)。

著录项

  • 来源
    《中国物理:英文版》 |2018年第5期|424-429|共6页
  • 作者单位

    Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;

    Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;

    Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;

    Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;

    Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;

    Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;

    College of Mechanical and Electrical Engineering, Yangtze Normal University, Chongqing 408100, China;

    Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;

    Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;

    Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;

    Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;

  • 收录信息 中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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  • 入库时间 2024-01-06 16:32:17
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