Method for producing crystallized glass member having curved shape
AssigneeKabushiki Kaisha Ohara
InventorsMoriji Nozaki, Toshitaka Yagi, Kohei Ogasawara
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Abstract
To obtain a crystallized glass member having a curved shape and provide a method for producing the same. A method for producing a crystallized glass member having a curved shape, including a deformation step for adjusting the temperature of a plate glass to a first temperature zone from higher than [At+40]° C. to [At+146]° C. or lower, where At is the yield point (° C.) of the plate glass and deforming at least part of the plate glass into a curved shape by external force acting on the plate glass while precipitating crystals from the plate glass.
Claims7
A crystallized glass member having a curved shape in which four sides of a rectangular plate are curved inward to form a curved surface,
- wherein the crystallized glass member comprises, in terms of oxide-based weight %,
- 40.0% to 70.0% SiO2 component,
- 11.0% to 25.0% Al2O3 component,
- 5.0% to 19.0% Na2O component,
- 0% to 9.0% K2O component,
- 0% to 3.0% CaO component,
- 0.5% to 12.0% TiO2 component,
- 0 to 15.0% Fe2O3 component,
- 0 to 2.00% CoO+Co3O4 component, and
- 0% or more to less than 2.0% B2O3 component,
- wherein a total amount of a MgO component and a ZnO component is 1.0% or more and 7.84% or less,
- wherein the crystallized glass member has a specific gravity of 2.530 to 2.653,
- wherein the curved surface of the rectangular plate has a curvature radius of 4 to 8 mm,
- and wherein the crystallized glass member contains at least one selected from the group consisting of MgAl2O4, Mg2TiO5, MgTi2O5, Mg2TiO4, MgTi2O4, MgSiO3, MgAl2Si2O8, Mg2Al4Si5O18, NaAlSiO4, FeAl2O4, and solid solutions thereof as a crystal phase.
Dependencies are inferred from the claim text.