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Gao X.-J.,Northwestern Polytechnical University | Gao X.-J.,Institute of China North Industry Group | Cheng L.-F.,Northwestern Polytechnical University | Cao J.-W.,Institute of China North Industry Group | And 7 more authors.
Optoelectronics and Advanced Materials, Rapid Communications | Year: 2015

B4C/SiC composites were obtained by reaction sintering between C/B4C green body and liquid Si, and the effect of carbon contents on microstructure was investigated by OM and SEM. Results show that B4C/SiC composites consist of three new phases, namely, SiC, B13C2, and B12(C, Si, B)3. Compared with composites without carbon addition, microstructure becomes more even and smaller with increased carbon contents ranging from 0 vol.% to 10 vol.%, which may be due to the generation of a small amount of SiC and the increase in grain boundary. However, when the carbon contents exceeded 10 vol.%, residual carbon can forms defects, and abnormal grain growth is clearly observed. Meanwhile, increased carbon addition, more SiC is generated results in poor distribution uniformity of each phase. © 2015, National Institute of Optoelectronics. All rights reserved.

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