A LARGE-SIZE SILICA GLASS PRODUCED BY A NEW SOL-GEL PROCESS
A LARGE-SIZE SILICA GLASS PRODUCED BY A NEW SOL-GEL PROCESS
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DOI：
10.1016/0022-3093(88)90067-1
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发表时间：
1988-03-01
影响因子：
3.5
通讯作者：
KOCHI, A
中科院分区：
文献类型：
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作者：
TOKI, M;MIYASHITA, S;KOCHI, A
采用一种新的溶胶-凝胶工艺制备了大尺寸石英玻璃，该工艺包括以下步骤：（a）用HCl水解Si（OC_2 H_5）_4;（B）添加SiO_2粉体并使其高度分散;（c）用氨水调节pH值;（d）凝胶化;（e）干燥成干凝胶;（f）烧结成石英玻璃。通过该工艺，获得了大至520 × 360 mm 2的干凝胶板，将其烧结成420 × 290 mm 2尺寸的石英玻璃。考察了pH值对溶胶凝胶化时间的影响，以及硅粉质量分数与干凝胶孔隙率的相关性。此外，通过该溶胶-凝胶工艺制备纤维预制体。
A large-size silica glass was fabricated with a new sol-gel process involving the following procedures: (a) hydrolysis of Si(OC2H5)4with HCl, (b) addition of silica powders and their high dispersion, (c) adjustment of the pH value by adding ammonia solution, (d) gellation, (e) drying to dry-gel, and (f) sintering to silica glass. With this process a dry-gel plate as large as 520 x 360 mm2was obtained, which was sintered to a 420 x 290 mm2sized silica glass. The effect of pH on the gelation time of the sol, and the correlation between the weight percentage of silica powder and porosity of dry-gel were examined. In addition, fiber preforms were produced by this sol-gel process.