Preparation of superhard cubic boron nitride sintered from commercially available submicron powders

被引：24

作者：

Liu, Teng ^{[1
]}

Kou, Zili ^{[1
]}

Lu, Jingrui ^{[1
]}

Yan, Xiaozhi ^{[2
]}

Liu, Fangming ^{[1
]}

Li, Xin ^{[1
]}

Ding, Wei ^{[1
]}

Liu, Jin ^{[1
]}

Zhang, Qiang ^{[1
]}

Wang, Qiang ^{[1
]}

Ma, Dejiang ^{[1
]}

Lei, Li ^{[1
]}

He, Duanwei ^{[1
]}

机构：

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

[2] China Acad Engn Phys, Inst Nucl Phys & Chem, Mianyang 621900, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2017年 / 121卷 / 12期

基金：

中国国家自然科学基金;

关键词：

HIGH-PRESSURE; MECHANICAL-PROPERTIES; PLASTIC-DEFORMATION; DIRECT TRANSFORMATION; DIAMOND; ULTRAHARD; HARDNESS; MICROSTRUCTURES; BOUNDARIES;

D O I：

10.1063/1.4979312

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Using submicron cubic boron nitride (cBN) powder as a starting material, polycrystalline cBN (PcBN) samples without additives were sintered from 8.0-14.0 GPa at 1750 degrees C, and their sintering behaviour and mechanical properties were investigated. Transmission electron microscopy analysis showed that high-density nanotwins could be generated from common submicron cBN grains during high pressure and high temperature treatment. The dislocation glide and (111) mechanical micro-twinning are the main mechanisms that underlie plastic deformation in the sintering process, and this contributes to the grain refinement. A refinement in the grain size (similar to 120 nm), micro-defect (nanotwin and stacking faults), and strong covalent bonding between the grains are crucial for improving the sample mechanical properties. The PcBN sintered at 11.0 GPa/1750 degrees C possessed outstanding mechanical properties, including a high Vickers hardness (similar to 72 GPa), fracture toughness (similar to 12.4 MPam(1/2)), and thermal stability (similar to 1273 degrees C in air). Published by AIP Publishing.

引用

页数：5

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