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中文摘要：
采用浆料法在硬质碳纤维毡表面制备石墨涂层,利用硅蒸镀使硅蒸汽在石墨涂层、碳纤维、基体碳表面反应生成SiC涂层。利用XRD、SEM及显微硬度计等研究了蒸镀时间对涂层微观结构、晶粒尺寸及显微硬度的影响,并分析了涂层形成过程。研究结果表明,蒸镀时间增加,表面涂层的微裂纹及孔洞减少,逐渐形成连续、致密的SiC涂层;蒸镀时间为3 h,涂层表面仅存在β-SiC;表面粗糙度低的石墨涂层作为硅蒸镀反应基体,生成的SiC晶粒较小;而表面粗糙度高的石墨涂层作为反应基体,表面涂层的显微硬度较大。
英文摘要：
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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