Effect of sintering additives on fabrication of silica porous glass structure

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  • Baek Su-Hyun
    Department of Molecular and Material Sciences, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • Isobe Toshihiro
    Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
  • Inada Miki
    Department of Molecular and Material Sciences, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University Center of Advanced Instrumental Analysis, Kyushu University Department of Applied Chemistry, Faculty of Engineering, Kyushu University

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<p>Silica (SiO2) porous glass materials is expected as a support in environmental fields due to transparency, high surface reactivity and so on. In this study, silica porous glass with high strength was fabricated by addition of potassium carbonate (K2CO3) as sintering aid and mullite as reinforcing materials. At first, a sintering condition was investigated using silica disk-type samples. A brittle amorphous silica disk with low density was obtained by firing at 1200 °C. At 1400 °C, crystallization was occurred and cristobalite formed. A small amount (∼1 wt %) of K2CO3 was effective to densification of amorphous silica, whereas more than 1 wt % K2CO3 addition accelerated the crystallization of silica. This was due to the formation of liquid phase. In addition, a highly dispersed mullite to SiO2 matrix was effective to enhance the mechanical property. The porous structure was successfully fabricated by template method using polyurethane.</p>

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