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Research Article | Open Access

Formation of nanocrystalline graphite in polymer-derived SiCN by polymer infiltration and pyrolysis at a low temperature

Mingxing LI, Laifei CHENG( ), Fang YE( ), Conglin ZHANG, Jie ZHOU
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China
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Abstract

The microstructure of polymer-derived ceramics (PDCs) was closely related to processing. This study demonstrated that SiCN matrix prepared by polymer infiltration and pyrolysis (PIP) at 900 ℃ inside a Si3N4 whisker (Si3N4w) preform with submicro-sized pores differed from its powder- consolidated analogue in both the content and structure of free carbon. Chemical analysis showed that PIP process had a higher free carbon yield. Raman spectroscopy and transmission electron microscopy (TEM) observation discovered a higher graphitization degree of free carbon and the existence of nanocrystalline graphite in SiCN matrix. Dielectric properties of Si3N4w/SiCN composites were greatly enhanced when volume fraction of SiCN matrix reached 24.5% due to dielectric percolation caused by highly-lossy free carbon. Reconsolidation of hydrocarbon released during pyrolysis by gas-state carbonization in Si3N4 whisker preform was supposed to account for the high yield and graphitization degree of free carbon in PIP process.

Keywords

polymer-derived ceramics (PDCs)silicon carbonitride (SiCN)free carboncarbonizationdielectric property

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Journal of Advanced Ceramics
Volume 10 Issue 6,
December 2021
Pages 1256-1272
DOI: 10.1007/s40145-021-0501-2
Cite this article:
LI M, CHENG L, YE F, et al. Formation of nanocrystalline graphite in polymer-derived SiCN by polymer infiltration and pyrolysis at a low temperature. Journal of Advanced Ceramics, 2021, 10(6): 1256-1272. https://doi.org/10.1007/s40145-021-0501-2

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Received: 05 February 2021
Revised: 28 April 2021
Accepted: 17 May 2021
Published: 29 August 2021
© The Author(s) 2021

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