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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Steam Activation on Development of Light Weight Biomorphic Porous SiC from Pine Wood Precursor
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Effect of Steam Activation on Development of Light Weight Biomorphic Porous SiC from Pine Wood Precursor

机译：蒸汽活化对松木前体轻质生物质多孔SiC生成的影响

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摘要

Biomorphic SiC materials with tailor-made microstructure and properties similar to ceramic materials manufactured by conventional method are a new class of materials derived from natural biopolymeric cellulose templates (wood). Porous silicon carbide (SiC) ceramics with wood-like microstructure have been prepared by carbothermal reduction of charcoal/silica composites at 1300-1600℃ in inert Ar atmosphere. The C/SiO_2 composites were fabricated by infiltrating silica sol into porous activated biocarbon template. Silica in the charcoal/silica composite, preferentially in the cellular pores, was found to get transformed in forms of fibers and rods due to shrinkage during drying. The changes in the morphology of resulting porous SiC ceramics after heat treatment to 1600℃, as well as the conversion mechanism of wood to activated carbon and then to porous SiC ceramic have been investigated using scanning electron microscope, x-ray diffraction, thermogravimetric analysis, and differential scanning calorimetry. Activation of carbon prior to silica infiltration has been found to enhance conversion of charcoal to SiC. The pore structure is found to be uniform in these materials than in those made from as-such charcoal/silica composites. This provides a low-cost and eco-friendly route to advanced ceramic materials, with near-net shape potential.
机译：具有定制的微观结构和特性的生物形态SiC材料类似于通过常规方法制造的陶瓷材料，是源自天然生物聚合纤维素模板（木材）的新型材料。通过在惰性Ar气氛中于1300-1600℃下对木炭/二氧化硅复合材料进行碳热还原，制备了具有木状微结构的多孔碳化硅陶瓷。通过将硅溶胶渗透到多孔活性生物碳模板中来制备C / SiO_2复合材料。发现由于干燥过程中的收缩，木炭/二氧化硅复合物中的二氧化硅，优选在细胞孔中，已转化为纤维和棒状。使用扫描电子显微镜，X射线衍射，热重分析，研究了热处理到1600℃后所得多孔SiC陶瓷的形貌变化，以及木材先转变为活性炭再转变为多孔SiC陶瓷的机理。和差示扫描量热法。已经发现在二氧化硅渗透之前对碳进行活化可以增强木炭向SiC的转化。发现这些材料中的孔结构比由这样的木炭/二氧化硅复合材料制成的孔结构更均匀。这为低成本和环保的途径提供了具有接近最终形状潜力的先进陶瓷材料的途径。

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