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Date of Publication:2014-01-01

Journal:功能材料

Issue:13

Page Number:13135-13139

ISSN No.:1001-9731

Abstract:SiC coated rigid carbon fibre felt was produced via the direct reaction between silicon vapor and carbon stemming from graphite coating carbon fiber and substrates by silicon evaporation.Successful silicon carbide layer calls for a graphite coating given on the substrate surface by means of a slurry coating technology.The mi-crostructural characterisation including phase structure and components,surface and profile micrograph,micro-hardness of SiC coating were studied by XRD,SEM,EDS and microhardness tester.The influence of evapora-tion time and surface roughness of graphite coating on coating and forming course of SiC coating was investiga-ted.The main results show that onlyβ-SiC exists on coating surface evaporated after three hours and with the increase of evaporation time,density and continuity of coating increase and cracks and holes decrease.The grain size of silicon carbide becomes smaller with low surface roughness of graphite coating as reaction matrix.The microhardness of SiC coating evaporated on high surface roughness of graphite coating was larger.

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