Nanosheet-structured B4C with high hardness up to 42 GPa

doi:10.1088/1674-1056/28/6/066201

Abstract

High-quality bulk boron carbide (B₄C) is successfully prepared at high pressure and high temperature (HPHT) by using B₄C powder as a precursor. The as-synthesized B₄C possesses a nanosheet structure with a thickness value of 15 nm and a length of several dozen micrometers. Its Vickers hardness value and fracture toughness value are 42.4 GPa and 4.51 MPa·m^1/2, respectively, which are superior to those of B₄C obtained from spark plasma sintering due to its high densification and nanosheet structure. Additionally, it shows good property of oxidation resistance. In air, its oxidation resistance temperature is 1100 ℃ which is higher than that of diamond under the same test condition.

Keywords: boron carbide hardness fracture toughness oxidation resistance

Received: 01 February 2019
Revised: 24 March 2019
Accepted manuscript online:

PACS:	62.23.-c	(Structural classes of nanoscale systems)
	61.46.Hk	(Nanocrystals)
	61.66.Fn	(Inorganic compounds)
	62.20.-x	(Mechanical properties of solids)

Fund:

Project supported by the Scientific Research Fund of Jilin Provincial Education Department, China (Grant No. JJKH20190826KJ)

Corresponding Authors: Chang-Chun Wang
E-mail: onlywangsong@163.com

Cite this article:

Chang-Chun Wang(王常春), Le-Le Song(宋乐乐) Nanosheet-structured B₄C with high hardness up to 42 GPa 2019 Chin. Phys. B 28 066201

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Nanosheet-structured B4C with high hardness up to 42 GPa

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Nanosheet-structured B₄C with high hardness up to 42 GPa