碳含量对反应烧结SiC/B4C力学性能的影响

doi:10.15541/jim20140494

无机材料学报 ›› 2015, Vol. 30 ›› Issue (1): 102-106.DOI: 10.15541/jim20140494 CSTR: 32189.14.10.15541/jim20140494

碳含量对反应烧结SiC/B₄C力学性能的影响

高晓菊^1,2, 曹剑武², 成来飞¹, 燕东明², 张丛², 满蓬²

(1. 西北工业大学超高温结构复合材料实验室, 西安710072; 2. 中国兵器工业第五二研究所烟台分所, 烟台264003)

收稿日期:2014-09-26 出版日期:2014-11-06 网络出版日期:2014-12-29
作者简介:高晓菊. E-mail: gxjg2933@163.com

Effect of Carbon Content on Mechanical Properties of SiC/B₄C Prepared by Reaction Sintering

GAO Xiao-Ju^1,2, CAO Jian-Wu², CHENG Lai-Fei¹, YAN Dong-Ming², ZHANG Cong², MAN Peng²

(1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China; 2. No. 52 Institute of China North Industry Group, Yantai 264003, China)

Received:2014-09-26 Published:2014-11-06 Online:2014-12-29
About author:GAO Xiao-Ju(1983–), candidate of PhD. E-mail: gxjg2933@163.com
Supported by:
Scientific and Technological Development Project of Yantai(2013JH020)

摘要/Abstract

摘要：

采用渗硅反应烧结工艺制备了SiC/B₄C复合材料, 并研究了碳含量对复合材料的力学性能及微观结构的影响。结果表明, SiC/B₄C复合材料的力学性能(硬度、抗弯强度、韧性)随着碳含量的增加呈先增强后减弱的趋势。在碳含量为10vol%的条件下, 复合材料的综合性能最佳, 其硬度、抗弯强度和韧性分别为19.63 Gpa、 358 MPa和3.96 MPa•m^1/2。此外, 当碳含量不足10vol%, 复合材料的组织随碳含量增加均匀性提高; 当碳含量超过10vol%, 显微组织均匀性变差, 并且添加碳粉后, 复合材料由沿晶、穿晶混合断裂向穿晶断裂转变, 最终导致SiC/B₄C复合材料力学性能的改变。

关键词: SiC/B4C复合材料, 反应烧结, 渗硅, 断裂模式

Abstract:

SiC/B₄C composite was obtained by reaction sintering with Si infiltration, and the effects of carbon content on mechanical properties and the microstructure were investigated. The results showed that the mechanical properties of the SiC/B₄C composite improved firstly and then worsened with increasing carbon content. The optimum comprehensive properties of the composite were obtained by addition of 10vol% carbon. The hardness, bending strength, and fracture toughness of the composite were 19.63 GPa, 358 MPa and 3.96 MPa·m^1/2, respectively. In addition, at carbon levels below 10vol%, the microstructure became more uniform as the carbon content increased. However, at carbon levels above 10vol%, the addition of carbon led to a fracture mode transformation, from combination of intergranular and transgranular to transgranular, which contributed to a change in the mechanical properties of the SiC/B₄C composite.

Key words: SiC/B4C composite, reaction sintering, infiltration of Si, fracture mode

中图分类号:

TB332

高晓菊, 曹剑武, 成来飞, 燕东明, 张丛, 满蓬. 碳含量对反应烧结SiC/B₄C力学性能的影响[J]. 无机材料学报, 2015, 30(1): 102-106.

GAO Xiao-Ju, CAO Jian-Wu, CHENG Lai-Fei, YAN Dong-Ming, ZHANG Cong, MAN Peng. Effect of Carbon Content on Mechanical Properties of SiC/B₄C Prepared by Reaction Sintering[J]. Journal of Inorganic Materials, 2015, 30(1): 102-106.

图/表 7

Fig. 1 Schematic of the reaction-bonded SiC/B4C. Vπ is the pore volume of a green body while V'π is the pore volume of a sintered body

Table 1 Formulation of SiC/B4C system

Samples	0#	1#	2#	3#	4#
C/vol%	0	5	10	15	20
B₄C/vol%	100	95	90	85	80

Fig. 2 OM images of the SiC/B4C composite with different C contents. (a) 0; (b) 5vol%; (c) 10vol%; (d) 15vol%

Fig. 3 Effect of carbon content on hardness and porosity

Fig. 4 Effect of carbon content on flexural strength and porosity

Fig. 5 Effect of carbon content on fracture toughness and porosity

Fig. 6 SEM images of the SiC/B4C composite with different carbon contents. (a, b) 0; (c, d) 5vol%; (e, f) 10vol%; (g, h) 15vol%

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碳含量对反应烧结SiC/B₄C力学性能的影响

Effect of Carbon Content on Mechanical Properties of SiC/B₄C Prepared by Reaction Sintering

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