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

  • Wei ZhengEmail author
  • Xin-bo He
  • Mao Wu
  • Xuan-hui Qu
  • Rong-jun Liu
  • Dan-dan Guan
Article
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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°C, where the composite was under a hydrostatic condition. Finally, the bending strength was found to range from 241 to 341 MPa.

Keywords

diamond SiC graphite diffusion composite 

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Notes

Acknowledgements

The work was financially supported by the National Key R&D Program of China (Nos. 2016YFB0301402 and 2016YFB0301400) and the National Natural Science Foundation of China (No. 51274040).

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Copyright information

© University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Wei Zheng
    • 1
    Email author
  • Xin-bo He
    • 1
  • Mao Wu
    • 1
  • Xuan-hui Qu
    • 1
  • Rong-jun Liu
    • 2
  • Dan-dan Guan
    • 1
  1. 1.Insititute for Advanced Material and TechnologyUniversity of Science & Technology BeijingBeijingChina
  2. 2.College of Aerospace and Materials EngineeringNational University of Defence TechnologyChangshaChina

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