Synthesis of a silicon carbide coating on carbon fibers by deposition of a layer of pyrolytic carbon and reacting it with silicon monoxide

被引：45

作者：

Ouyany Haibo ^{[1
]}

Li Hejun ^{[1
]}

Qi Lehua ^{[1
]}

Li Zhenjia ^{[1
]}

Wei Jian ^{[1
]}

Wei Jianfeng ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Key Lab Ultrahigh Temp Composites, Composites Res Ctr, Xian 710072, Shaanxi, Peoples R China

来源：

CARBON | 2008年 / 46卷 / 10期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1016/j.carbon.2008.05.017

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A method for preparing a SiC coating on carbon fibers is presented. The SiC coating was generated from the reaction of silicon monoxide (SiO) with a pyrolytic carbon (PyC) layer deposited on the fibers. The influence of holding time on the microstructure of the SiC layer was discussed. The oxidation behaviors of the uncoated and SiC coated carbon fibers were compared. The formation mechanism of the SiC coating was evaluated. With increased reaction time, the SiC coating becomes thicker and its surface becomes rough. The oxidation resistance of the carbon fiber was improved by the SiC coating. The initial oxidation temperature of the SiC coated carbon fiber is about 200 degrees C higher than that of the uncoated carbon fiber. The growth of the SiC coating is mainly attributed to the indirect reactions of SiO with PyC in the SiO/SiC/C system, in which silicon is considered a critical intermediate product. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1339 / 1344

页数：6

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