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

被引：0
作者：
Mingxing LI [1 ]
Laifei CHENG [1 ]
Fang YE [1 ]
Conglin ZHANG [1 ]
Jie ZHOU [1 ]
机构：
[1] Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University
来源：
Journal of Advanced Ceramics | 2021年 / 06期
基金：
中国国家自然科学基金;
关键词：
D O I：
暂无
中图分类号：
TQ174.1 [基础理论];
学科分类号：
0805 ; 080502 ;
摘要：
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) at900℃inside a SiNwhisker (SiN) preform with submicro-sized pores differed from its powderconsolidated 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 SiN/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 SiNwhisker preform was supposed to account for the high yield and graphitization degree of free carbon in PIP process.
引用
收藏
页码：1256 / 1272
页数：17
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