Manufacturing method of alkali-free glass
A manufacturing method and technology of alkali-free glass, which is applied in glass manufacturing equipment, manufacturing tools, glass production, etc., can solve the problems of refractory material erosion in melting furnaces and glass quality degradation, and achieve the effect of inhibiting erosion and improving quality
Active Publication Date: 2019-04-02
ASAHI GLASS CO LTD
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Problems solved by technology
As a means of heating the raw material when it is melted, it is generally heated to a predetermined temperature by the combustion flame of the burner arranged above the melting kiln. The refractory material of the melting kiln is eroded
When erosion of the refractory material occurs, the components of the refractory material melt into the molten glass, resulting in a decrease in the quality of the glass produced, which creates problems
Method used
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Embodiment
[0147] The electrical resistivity of molten glass and a refractory (zirconia-based electroformed refractory) was measured in a temperature range of 1300 to 1700°C.
[0148] For the molten glasses (glass 1, glass 2, glass 3), the raw materials of each component were prepared so that the composition shown below was obtained, and it melted at the temperature of 1600 degreeC using the platinum crucible. At the time of melting, stirring was performed using a platinum stirrer to homogenize the glass. The electrical resistivity was measured by the method described in the following literature, in the state which held the molten glass obtained in this way in the temperature range of 1300-1700 degreeC.
[0149] "Measurement Method of Conductivity of Ionic Melt, Nozomi Ota, Mikasa Miyazaki, Kenji Morinaga, Taketoshi Yanase, Journal of the Japan Society for Metals Vol. 45, No. 10 (1981) 1036-1043" ("Conductivity of ionic melts) Determination method, Noo Ohta, Mitsumi Miyazaki, Kenji Mori...
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Abstract
The present invention pertains to a method for production of non-alkali glass in which a glass starting material is loaded into a melting furnace and heated to a temperature of 1350 to 1750°C to form molten glass, and the molten glass is thereafter molded into a plate shape using a float glass process, the method for production of non-alkali glass comprising selecting the glass starting material and a refractory material so that Rb > Rg, using for heating in the melting furnace both heating by a combustion flame of a burner and energizing heating of the molten glass using a heating electrode disposed so as to be immersed in the molten glass inside the melting furnace, where Rg (&OHgr;cm) is the electrical resistivity at T3.3, which is the clarifying temperature of the molten glass (the temperature at which glass viscosity is 103.3dPa・s; units: °C), and Rb (&OHgr;cm) is the electrical resistivity of the refractory material constituting the melting furnace at T3.3.
Description
technical field [0001] The present invention relates to a method for producing an alkali-free glass suitable as a substrate glass for various displays or a substrate glass for a photomask. [0002] Hereinafter, in this specification, when referring to "alkali-free", it refers to alkali metal oxides (Li 2 O, Na 2 O, K 2 The content of O) is 2000 ppm or less. Background technique [0003] Conventionally, the characteristics shown below have been required for various substrate glasses for displays, particularly substrate glasses for displays on which a metal or oxide thin film or the like is formed on the surface. [0004] (1) When alkali metal oxides are contained, alkali metal ions diffuse into the film to degrade the film properties. Therefore, the content of alkali metal oxides is required to be extremely low, specifically, the content of alkali metal oxides is required to be 2000 ppm or less. [0005] (2) In order to minimize the deformation of the glass and the shrink...
Claims
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IPC IPC(8): C03B5/235C03B5/43C03C3/091C03C3/093
CPCC03B5/43C03B5/185C03C3/091C03C3/093Y02P40/57
Inventor 德永博文小野和孝
Owner ASAHI GLASS CO LTD