ゾル-ゲル法で造られるシリカガラス繊維の引っ張り強度に及ぼす予備熱処理の影響 : ゲル-ガラス変換過程における構造変化との関連

概要

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The effect of preheat treatment in the temperature range of 200 to 500℃ on the tensile strength of the sol-gel-derived silica glass fibers heat-treated up to 800℃ was examined. Preheat treatment at 300℃ for 10h in-creased the tensile strength from ca.0.9 GPa to ca.1.3 GPa. Such an effect was interpreted in relation to the change in overall atomic scale-structure of the gel-network. It was considered that the preheat treatment at 300℃ suppressed the abrupt reconstructive change from a gel network consisting of OH-terminated 4-membered siloxane rings to three-dimensional network constructed with 6-membered siloxane rings, while the reconstructive change may often lead to the partial destruction of the silica network when heat-treated rapidly.
1995-03-01