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Polycarbosilane as a modulator for reaction-bonded silicon carbide processing of GNPs/Si mixtures

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Abstract

When graphene is used to enhance reaction-bonded silicon carbide (RBSC), the problem of graphene being corroded by molten silicon should be considered. In this work, the polycarbosilane (PCS) was uniformly adhered to the surface of graphene nanoplatelets (GNPs) by the sol–gel method, and SiC barrier formed after pyrolysis. The structural evolution of GNPs in reaction sintering and the chemical structure of GNPs-PCS were investigated. The results showed that GNPs after siliconizing showed a porous structure, consisting of nanometer SiC particles on the surface. The ceramic yield and final pyrolysis temperature of PCS were reduced after mixing with GNPs and divinylbenzene (DVB). The SiC formed by the pyrolysis of PCS was uniformly distributed among GNPs. SiC whiskers (SiCw) were observed in the sample of GNPs and GNPs-PCS after siliconizing. The difference and formation mechanism of SiCw in these two samples were discussed. After PCS modification and pyrolysis, GNPs survived in the loss on ignition experiment. The prepared composite powder further improved the toughness of GNPs/RBSC by 14.69%.

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Acknowledgements

This work was supported by the Bei**g Natural Science Foundation (6192020), and National Natural Science Foundation of China (31971742).

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Authors and Affiliations

  1. MOE Key Laboratory of Wooden Material Science and Application, Bei**g Forestry University, PO Box 100083, Bei**g, China

    Fu Liu, Mingjie Wang, Yao Chen & Jianmin Gao

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  1. Fu Liu
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Correspondence to Yao Chen or Jianmin Gao.

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Liu, F., Wang, M., Chen, Y. et al. Polycarbosilane as a modulator for reaction-bonded silicon carbide processing of GNPs/Si mixtures. Appl. Phys. A 128, 767 (2022). https://doi.org/10.1007/s00339-022-05917-y

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