| 摘要 |
<p>To provide a method suitable for manufacturing an alkali-free glass that solves the above-described disadvantages, has high strain point, low viscosity and low devitrification properties, and particularly is easily formed by float process. A method for manufacturing an alkali-free glass, including putting a glass raw material in a melting furnace, heating the glass raw material at a temperature of 1,400 to 1,800°C to thereby prepare a molten glass, and forming the molten glass into a sheet shape, wherein heating by combustion flame of a burner and electrical heating of the molten glass by a heating electrode arranged so as to be dipped in the molten glass in the melting furnace are used in combination in the heating in the melting furnace, and when an electrical resistivity of the molten glass at 1,400°C is defined as Rg (©cm) and an electrical resistivity of a refractory constituting the melting furnace at 1,400°C is defined as Rb (©cm), the glass raw material and the refractory are selected so as to satisfy Rb>Rg.</p> |
