Hardness measurements for high-pressure prepared TaB and nano-TaC ceramics

被引：9

作者：

Chen, Haihua ^{[1
]}

Liang, Hao ^{[2
]}

Liu, Lingxiao ^{[1
]}

Li, Huishan ^{[1
]}

Liu, Kui ^{[1
]}

Peng, Fang ^{[2
]}

机构：

[1] Qinghai Univ, Fdn Dept, Xining 810016, Qinghai, Peoples R China

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

来源：

RESULTS IN PHYSICS | 2017年 / 7卷

基金：

中国国家自然科学基金;

关键词：

TaB; TaC; High-pressure; Vickers hardness; Fracture toughness; HIGH-TEMPERATURE; ELECTRONIC-STRUCTURE; TANTALUM CARBIDE; COMPOSITES; NBB2;

D O I：

10.1016/j.rinp.2017.10.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Vickers hardness of the bulk TaB and nano-TaC ceramics sintered at high pressure and high temperature were measured by using a diamond indentation method. Our tests gave a maximum Vickers hardness of 13.9 GPa for TaB, and 19.2 GPa for nano-TaC ceramics under a load of 29.4 N. The hardness of nano-TaC-5 wt% Co composites was also measured under the same load for comparison, which was found to be much lower than that of TaB and nano-TaC. The relative densities calculated by the Archimedes method are 13.5 g/cm(3) for TaB and 13.6 g/cm(3) for nano-TaC. The averaged fracture toughness is 6.8 +/- 0.3 MPa m(1/2) for TaB and 5.0 +/- 0.2 MPa m(1/2) for nano-TaC. Our results show that the hardness of the TaB may not be as high as previous reports. (C) 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.

引用

页码：3859 / 3862

页数：4

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