碳含量对反应烧结制备的碳化硼陶瓷复合材料力学性能的影响

Effect of Carbon Content on Mechanical Properties of Boron Carbide Ceramics Composites Prepared by Reaction Sintering.

作者信息

Sha Wenhao, Liu Yingying, Zhou Yabin, Huang Yihua, Huang Zhengren

机构信息

State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, No. 588, HeShuo Road, Jiading District, Shanghai 201800, China.

University of Chinese Academy of Sciences, Beijing 100049, China.

出版信息

Materials (Basel). 2022 Sep 1;15(17):6028. doi: 10.3390/ma15176028.

DOI:10.3390/ma15176028

PMID:36079409

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9457173/

Abstract

In this study, different reaction-bonded boron carbide (RBBC) composites with a free carbon addition from 0 to 15 wt% were prepared, and the effect of the carbon content on the mechanical properties was discussed. With the free carbon addition increase from 0 to 15 wt%, the residual silicon content in the RBBC composite decreased first and then increased. Meanwhile, the strength of the RBBC composite improved first and then worsened. In the RBBC composite without free carbon, the BC grains are obviously dissolved, the grains become facet-shape, and the grain boundary becomes straight. The microstructure of the composite was tested by SEM, and the phase composition of the composite was tested by XRD. The RBBC composite with the addition of 10 wt% free carbon has the highest flexural strength (444 MPa) and elastic modulus (329 GPa). In the composite with a 10 wt% carbon addition, the phase distribution is uniform and the structure is compact.

摘要

在本研究中，制备了游离碳添加量从0到15 wt%的不同反应烧结碳化硼（RBBC）复合材料，并讨论了碳含量对力学性能的影响。随着游离碳添加量从0增加到15 wt%，RBBC复合材料中的残余硅含量先降低后增加。同时，RBBC复合材料的强度先提高后变差。在无游离碳的RBBC复合材料中，BC晶粒明显溶解，晶粒变为多面体形，晶界变直。通过扫描电子显微镜（SEM）测试了复合材料的微观结构，通过X射线衍射仪（XRD）测试了复合材料的相组成。添加10 wt%游离碳的RBBC复合材料具有最高的抗弯强度（444 MPa）和弹性模量（329 GPa）。在添加10 wt%碳的复合材料中，相分布均匀且结构致密。