Graphite addition for SiC formation in diamond/SiC/Si composite preparation

Wei Zheng; Xin-bo He; Mao Wu; Xuan-hui Qu; Rong-jun Liu; Dan-dan Guan

doi:10.1007/s12613-019-1808-7

Volume 26 Issue 9

Sep. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(9): 1166-1176

Wei Zheng, Xin-bo He, Mao Wu, Xuan-hui Qu, Rong-jun Liu, and Dan-dan Guan, Graphite addition for SiC formation in diamond/SiC/Si composite preparation, Int. J. Miner. Metall. Mater., 26(2019), No. 9, pp. 1166-1176. https://doi.org/10.1007/s12613-019-1808-7

Cite this article as:

Wei Zheng, Xin-bo He, Mao Wu, Xuan-hui Qu, Rong-jun Liu, and Dan-dan Guan, Graphite addition for SiC formation in diamond/SiC/Si composite preparation, Int. J. Miner. Metall. Mater., 26(2019), No. 9, pp. 1166-1176. https://doi.org/10.1007/s12613-019-1808-7

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Research Article

Graphite addition for SiC formation in diamond/SiC/Si composite preparation

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Corresponding author:
Wei Zheng E-mail: zhengwei_16@163.com
Received: 3 December 2018; Revised: 8 January 2019; Accepted: 11 January 2019

Abstract

Abstract

Herein, graphite was used in the Si-vapor reactive infiltration of diamond/SiC/Si composites to produce composites with various SiC contents. X-ray diffraction was used to determine the phases of the composite, whereas scanning electron microscopy was used to confirm the Si-C reaction between the silicon, graphite, and diamond and to observe the SiC morphology. Various SiC contents in the composite were observed with graphite addition. Furthermore, the reaction between silicon and graphite (diamond) produced coarse (fine) SiC particles. The generation of a 10-μm-diameter Si-C area on the surface of the diamond was observed. The thermal conductivity (TC) and coefficient of thermal expansion (CTE) of the composite was investigated, where the TC varied from 317-426 W·m^-1·K^-1 with the increase of the SiC volume fraction from 38% to 76% and the corresponding CTE increased from 1.7×10^-6 to 3.7×10^-6 K^-1, respectively. Furthermore, a critical point for the CTE was found to exist at approximately 250℃, where the composite was under a hydrostatic condition. Finally, the bending strength was found to range from 241 to 341 MPa.
- diamond;
- SiC;
- graphite;
- diffusion;
- composite

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