纳米结构B4C的合成及其性质的研究

doi:10.14139/j.cnki.cn22-1228.2019.06.019

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摘要

B₄C是继金刚石和立方氮化硼之后自然界中第三硬的超硬材料。然而人们在硬度方面对它的应用却很少。这主要是因为B₄C的自扩散系数很低，很难合成出块体材料的B₄C其次，B₄C断裂韧性很低,达不到工业应用的标准，在工业应用中容易出现碎裂。本篇文章利用高温高压法合成了块体材料的B₄C并且合成的材料具有非常高的致密性。通过硬度测试发现其硬度高于材料的单晶硬度值。利用压痕法测量了样品的断裂韧性，其断裂韧性为4.51 MPa?m^1/2,这一数值基本接近了工业应用的标准。通过扫面电镜测试发现其具有纳米层状结构。通过原理分析可知，纳米片层结构是导致B₄C有高硬度和高断裂韧性的原因。

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关键词: B₄C 超硬材料纳米层状结构断裂韧性

Abstract:

Boron carbide (B₄C) is the third hardest materials in the nature following the diamond and cubic boron nitride. However, due to bulk B₄C is hard to be synthesized and the fracture toughness of B₄C is very low, B₄C can not be widely used as superhard material. In this work, High-quality bulk B₄C was successfully prepared at high pressure and high temperature. It is worth nothing that the as-synthesized B₄C possess high hardness and high fracture toughness （4.51 MPa?m^1/2）which are superior to single crystal. The high Vickers hardness and high fracture toughness of B₄C are attributeed to its high densification and nanosheet structure.

Key words: Boron carbide Superhard Material nanosheet structure Fracture toughness

出版日期: 2019-12-25 发布日期: 2019-12-25 整期出版日期: 2019-12-25

ZTFLH:

O469

引用本文:

宋乐乐, 解玉鹏. 纳米结构B₄C的合成及其性质的研究 [J]. 大学物理实验, 2019, 32(6): 80-83.
SONG Lele, XIE Yupeng. Exploring the Synthesis and Properties of Nano-structured B₄C . Physical Experiment of College, 2019, 32(6): 80-83.

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http://dawushiyan.jlict.edu.cn/CN/10.14139/j.cnki.cn22-1228.2019.06.019 或 http://dawushiyan.jlict.edu.cn/CN/Y2019/V32/I6/80

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