无机材料学报2012，Vol.27Issue(2)：162-168,7.DOI:10.3724/SP.J.1077.2012.00162
组成和结构对连续SiC纤维电阻率的影响
Effect of Composition and Structure on the Specific Resistivity of Continuous Silicon Carbide Fibers
摘要
Abstract
Three kinds of continuous SiC fibers with different specific resistivity were prepared by the pyrolysis of cured polycarbosilane fiber, and the structure and composition of the three fibers were characterized. Results show that SiC fibers with different specific resistivity can be obtained by changing the curing and pyrolysis conditions. And the total free carbon content and the ability to crystallize will no longer affect the specific resistivity notably when the fiber is covered with an excess carbon layer, as a result the fiber will have a low electrical resistivity. The excess carbon layer in the circular outer part is originated form the re-pyrolysis and deposition of hydrocarbon volatiles. Removal of the carbon by oxidative treatment may affect the surface property and also promote the magnitude of specific resistivity. The influence of the surface property on the specific resistivity is considerable which should not be neglected.关键词
聚碳硅烷/SiC纤维/富碳/电阻率Key words
polycarbosilane/ silicon carbide fiber/ excess carbon/ specific resistivity分类
化学化工引用本文复制引用
王得印,宋永才,简科..组成和结构对连续SiC纤维电阻率的影响[J].无机材料学报,2012,27(2):162-168,7.基金项目
国防科技重点实验室基金(9140C8202050903) （9140C8202050903）
