Micro-/Macroporous Ceramics from Preceramic Precursors
Micro-/Macroporous Ceramics from Preceramic Precursors
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DOI：
10.1111/j.1151-2916.2001.tb00997.x
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发表时间：
2004-12
影响因子：
3.9
通讯作者：
H. Schmidt;D. Koch;G. Grathwohl;P. Colombo
中科院分区：
文献类型：
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作者：
H. Schmidt;D. Koch;G. Grathwohl;P. Colombo
多孔碳氧化硅（SiOC）陶瓷，特别是块状和蜂窝状结构，通过聚合物热解生产。通过使用最佳热解参数（即，加热速率、最高温度）时，固体填料或化学活性添加剂的加入有效地防止了孔结构的坍塌并通过分解控制了孔的形成。快速热解可导致裂纹形成和在高于600°C的温度下的比表面积损失，而缓慢热解能够保持高达1200°C的中孔与高表面积的组合。这些具有双峰孔径分布的SiOC陶瓷是在苛刻条件下用于吸附/分离过程的潜在候选者。
Porous silicon oxycarbide (SiOC) ceramics in particular bulk and cellular structures are produced via polymer pyrolysis. By using optimal pyrolysis parameters (i.e., heating rate, maximum temperature) the addition of either solid fillers or chemically active additives is efficient in preventing the collapse of pore structure and controlling pore formation through decomposition. Fast pyrolysis can lead to crack formation and a loss of specific surface area at temperatures above 600°C, whereas slow pyrolysis is able to preserve mesopores up to 1200°C combined with high surface areas. These SiOC ceramics with bimodal pore size distribution are potential candidates for adsorption/separation processes under severe conditions.