Synthesis of SiC-TiO₂ hybrid aerogel via supercritical drying combined PDCs route

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• 作者：Peng Chu^a ; ^b ; Hongli Liu^a ; ^b ; ^{jw04@tcu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yajing Li^a ; ^b ; Haiyuan Zhang^a ; ^b ; Jiadong Li^a ; ^b
• 关键词：Polymer-derived ceramic ; SiC-TiO2 ; Aerogel ; Supercritical drying
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：15 November 2016
• 年：2016
• 卷：42
• 期：15
• 页码：17053-17058
• 全文大小：2016 K

文摘

The SiC-TiO₂ hybrid aerogels were obtained from polycarbosilane (PCS) and tetrabutyltitanate (TBT) as precursors using supercritical drying and polymer derived ceramics route. The polymer to ceramic conversion and the crystallization behavior were studied by X-ray diffraction (XRD) and transmission electron microscopy (TEM), suggesting the preceramic aerogels converted to the SiC-TiO₂ ceramic aerogels through pyrolysis process at different temperatures. At 1200 °C, the ceramic aerogels were homogeneous with well-distributed element components, composed of rutile TiO₂ and the β-SiC crystalline phases. The results show that the SiC-TiO₂ ceramic aerogels with netwoks structure have 23.36 nm average pore size, high surface area (58 m²/g) and pore volume (0.22 cm³/g).