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研究了大黄米向生物形貌SiC的转化。大黄米经800℃炭化转变成碳模板,在1600℃下与熔融硅反应生成SiC。以TG技术考察大黄米向碳模板转化过程的失重行为,以XRD、SEM等方法对碳模板和SiC的物相、形貌结构进行分析。结果表明,相比于大黄米,碳模板发生了大约82%的失重和20%~30%的各向异性收缩,表面分布有孔隙通道,内部呈蜂窝状的分级孔道结构。最终的产物以β-SiC为主,且较好地复制了碳模板的宏观形貌和微观结构,表明碳模板成功转化为生物行貌的SiC材料。
The conversion of rhubarb to biomorphic SiC was studied. Rhubarb rice is carbonized at 800 ℃ into a carbon template, which reacts with the molten silicon at 1600 ℃ to form SiC. The weight loss behavior of rhubarb rice to carbon template was investigated by TG technique. The phase and morphology of carbon template and SiC were analyzed by XRD and SEM. The results show that compared with rhubarb rice, the carbon template has about 82% weight loss and 20% -30% anisotropic shrinkage. The pore distribution is distributed on the surface and the honeycomb graded pore structure is present on the surface. The final product was mainly β-SiC, and the macro-morphology and microstructure of the carbon template were well reproduced, indicating that the carbon template successfully transformed into the biominematic SiC material.