石墨与稻壳灰制取的碳化硅涂层特性

THE PROPERTIES OF SiC-COATING FORMED THROUGH REACTION OF RICE HULL ASH WITH GRAPHITE

研究了稻壳灰与不同孔隙度石墨在（１６５０±５０）℃反应生成碳化硅涂层的特性．涂层的厚度和密度随加温时间的延长而增大，高孔隙的电极石墨，其涂层的界面结合强度和抗热震性优于低孔隙的高纯石墨；涂层的抗氧化烧蚀则后者优于前者．Ｘ射线衍射分析表明，涂层为β晶型碳化硅，用Ｘ６５０扫描电镜观察，碳化硅涂层呈网状结构．

This paper described the formation of SiC-coating from the reaction of rice hull ash with graphite at temperature (16b0±50)℃. It was investigated that the thinkness of SiC-coating and its density increased with holding time. The interface bonding strength and thermal shock resistance of high porosity graphite were lower than that of low porosity one, and in respect of resistance against oxidation burn-off, the low porosity graphite was superior to the high porosity one.X-ray diffraction study showed SiC-coating consists of β-SiC and SEM determination discovered SiC-coating with network crystal.