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

doi:10.15541/jim20140494

Abstract

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

CLC Number:

TB332

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.

Figures/Tables 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%

References 11

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

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