以甲基三乙氧基硅烷为原料,盐酸为催化剂,乙醇为溶剂在一定的条件下制备二氧化硅溶胶,再与竹炭粉、硅粉按照一定的比例充分混合均匀,在Ar气氛下经高温烧结制得SiC陶瓷材料.借助FT-IR、SEM-EDS和XRD等测试方法对转变为SiC过程中的物理化学结构变化、显微结构和物相变化进行了表征,并对其吸附性能和导电性能进行了试验.试验结果表明,在竹炭转变为SiC的高温处理过程中,化学键Si-O键基本上全部转变为Si-C键;竹炭的显微结构很好的留在了SiC陶瓷中;竹炭SiC陶瓷材料是一种包含单质Si、C和SiC多相组分的复合材料.在1650℃条件下的SiC陶瓷材料的吸附能力比其它两个要高;竹炭SiC材料具有较低的电阻率,是一种半导体材料.
This experiment used MTES as raw materials,HCl as catalyzers,and C2H5OH as solvent to prepare SiO_2 sol under certain condition.Then it mixed bamboo charcoal powder,silica powder and SiO_2 sol in terms of definite proportion,and resulted in the formation of SiC ceramic in static argon atmosphere.FT-IR,SEM-EDS and XRD were employed to characterize the physico-chemichal structure changes,microstructure and phase changes during bamboo charcoal-to-SiC ceramics conversion.And the adsorption and resistance were studied at the same time.The results showed that during high-temperature processing,chemical bond was totally transformed from Si-O to Si-C,the microstrcture details of the bamboo were retained in SiC ceramics,and the SiC ceramics prepared by this technique are multi-phase solids composed of SiC,free-silicon and C.And SiC ceramics at 1650℃ had higher adsorption capability than others'.The ceramics were semiconductor materials,which had lower resistivity.
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