Fabrication of macroporous silicon carbide ceramics by intramolecular carbothermal reduction of phenyl-bridged polysilsesquioxane
Fabrication of macroporous silicon carbide ceramics by intramolecular carbothermal reduction of phenyl-bridged polysilsesquioxane
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DOI：
10.1039/b913992c
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发表时间：
2009-01-01
影响因子：
--
通讯作者：
Hanada, Teiichi
中科院分区：
文献类型：
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作者：
Hasegawa, George;Kanamori, Kazuyoshi;Hanada, Teiichi
采用溶胶-凝胶法制备了苯基桥联的聚倍半硅氧烷，并通过亚稳分解和分子内碳热还原反应制备了大孔SiC陶瓷。通过这种方法，我们可以得到更好的原子级均匀性和控制孔径更容易比分子间碳热还原使用的SiO2和碳粉的混合物的大孔SiC陶瓷。因此，所得SiC陶瓷具有足够高的纯度，而无需用氢氟酸洗涤以去除残留的SiO2。
Macroporous SiC ceramics were obtained from porous phenyl-bridged polysilsesquioxane prepared by a sol-gel method accompanied by spinodal decomposition subsequently subjected to intramolecular carbothermal reduction. By this method, we can obtain macroporous SiC ceramics with improved atomic-level homogeneity and controlled pore size more easily than by intermolecular carbothermal reduction using a mixture of SiO2 and carbon powder. Therefore, the resultant SiC ceramics have sufficiently high purity without washing with hydrofluoric acid to remove residual SiO2.