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

被引：7

作者：

Yang, Ming ^{[1
]}

Kou, Zi-Li ^{[1
]}

Liu, Teng ^{[1
]}

Lu, Jing-Rui ^{[1
]}

Liu, Fang-Ming ^{[2
]}

Liu, Yin-Juan ^{[1
]}

Qi, Lei ^{[1
]}

Ding, Wei ^{[1
]}

Gong, Hong-Xia ^{[1
]}

Ni, Xiao-Lin ^{[1
]}

He, Duan-Wei ^{[1
]}

机构：

[1] Sichuan Univ, Inst Atom & Mol Phys, Chengdu 610065, Sichuan, Peoples R China

[2] Yangtze Normal Univ, Coll Mech & Elect Engn, Chongqing 408100, Peoples R China

来源：

CHINESE PHYSICS B | 2018年 / 27卷 / 05期

关键词：

PcBN compact; high temperature and high pressure sintering; PcBN without additive; GRAPHITE-LIKE BN; MECHANICAL-PROPERTIES; MICROSTRUCTURES; TRANSFORMATION; COMPOSITES; BOUNDARIES;

D O I：

10.1088/1674-1056/27/5/056105

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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 degrees C 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 degrees C possessed the outstanding properties, including a high Vickers hardness (similar to 61.5 GPa), thermal stability (similar to 1290 degrees C in air), and high density (similar to 3.46 g/cm(3)).

引用

页数：6

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