| 摘要 |
PURPOSE:To lower the liquid-phase temperature of a glass composition for filament fiber and containing SiO2-B2O3-Al2O3-CaO, and to prevent the devitrification and end breakage, etc. of the glass fiber during spinning, by adding MgO to the glass composition at a specific weight ratio. CONSTITUTION:Glass raw materials are weighed and mixed in a manner to obtain a glass composition composed of 53.5-56(wt)% SiO2, 5.5-7% B2O3, 13.3- 15% Al2O3, 20-24% CaO, 0.7-2% MgO, 0-1% Fe2O3, 0-2% TiO2, 0-1% Na2O, 0-1% K2O and 0.1-1% F2, and the mixture is heated, molten, and cooled to obtain the objective glass composition for fiber. The liquid-phase temperature of the glass composition is as low as about <=1,080 deg.C, and the difference between the spinning temperature and the liquid-phase temperature is as large as >=95 deg.C. The above composition may further contain 0-0.5% SO3, 0-1% Li2O and 0- 1% BaO.
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