中国物理B ›› 2019, Vol. 28 ›› Issue (6): 66201-066201.doi: 10.1088/1674-1056/28/6/066201

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Nanosheet-structured B4C with high hardness up to 42 GPa

Chang-Chun Wang(王常春), Le-Le Song(宋乐乐)   

  1. 1 College of Science, Jilin Institute of Chemical Technology, Jilin 132022, China;
    2 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
  • 收稿日期:2019-02-01 修回日期:2019-03-24 出版日期:2019-06-05 发布日期:2019-06-05
  • 通讯作者: Chang-Chun Wang E-mail:onlywangsong@163.com
  • 基金资助:

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

Nanosheet-structured B4C with high hardness up to 42 GPa

Chang-Chun Wang(王常春)1, Le-Le Song(宋乐乐)1,2   

  1. 1 College of Science, Jilin Institute of Chemical Technology, Jilin 132022, China;
    2 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
  • Received:2019-02-01 Revised:2019-03-24 Online:2019-06-05 Published:2019-06-05
  • Contact: Chang-Chun Wang E-mail:onlywangsong@163.com
  • Supported by:

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

摘要:

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·m1/2, 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.

关键词: boron carbide, hardness, fracture toughness, oxidation resistance

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·m1/2, 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.

Key words: boron carbide, hardness, fracture toughness, oxidation resistance

中图分类号:  (Structural classes of nanoscale systems)

  • 62.23.-c
61.46.Hk (Nanocrystals) 61.66.Fn (Inorganic compounds) 62.20.-x (Mechanical properties of solids)