以生物微孔结构的硅藻土为原料,利用一步碳热还原法在1200～1500℃不同时间下焙烧制备了高纯β-siC产品.结果表明,随着焙烧温度和时间增加,产率提高,比表面积降低.通过FT-IR和XRD证明产物为β-SiC,氮气吸附测试产品的比表面积,SEM表明制备的微孔SiC保持了硅藻土的微观形貌.此法在1400℃焙烧4h最佳条件下制备了产率为51.09％,比表面积为97.56 m2/g,平均粒度为40 μm,孔隙率为68.41％,表观密度为1.4336g/cm3的生物微孔SiC材料.
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