Glass for chemical strengthening, chemically strengthened glass, and electronic device case
A technology for strengthening glass and electronic equipment, which is applied in the field of electronic equipment casings, and can solve the problems of crystallized glass, such as insufficient transparency, low transparency, and limited design of crystallized glass, and achieve thermal conductivity, transparency, and strength that are not easily damaged excellent effect
Pending Publication Date: 2020-03-31
ASAHI GLASS CO LTD
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- Application Information
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Problems solved by technology
However, crystallized glass is not as transparent as amorphous glass
Crystallized glass with low transparency has limitations in designability
Method used
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Embodiment
[0171] Hereinafter, the present invention will be described using examples, but the present invention is not limited thereto. Examples 1 to 4 are examples, and examples 5 and 6 are comparative examples.
[0172] Glass raw materials were prepared so that the glass composition shown by the mass % of an oxide basis in Table 1 was obtained, and it weighed so that 800g of glass could be obtained. Next, the mixed glass raw materials were put into a platinum crucible, put into an electric furnace at 1500° C. to 1700° C., and melted for about 5 hours for degassing and homogenization.
[0173] The resulting molten glass was poured into a mold, kept at the glass transition temperature for 1 hour, and then cooled to room temperature at a rate of 0.5° C. / minute to obtain a glass block.
[0174] (glass transition temperature)
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Abstract
The present invention pertains to a glass for strengthening, that: has an average transmittance of at least 70% when converted to a thickness of 0.8 mm at a wavelength of 380-780 nm; has a haze valueof no more than 0.7% when converted to a thickness of 0.8 mm in a C light source; has a Young's modulus of at least 85 GPa; has a fracture toughness value of at least 0.90 MPa m<1 / 2>; a thermal conductivity at 20 DEG C of at least 1.3 W / m K; and comprises a lithium aluminosilicate crystallized glass.
Description
technical field [0001] The present invention relates to a chemically strengthened glass which is highly transparent crystallized glass, a chemically strengthened glass, and an electronic device case using the chemically strengthened glass. Background technique [0002] Chemically strengthened glass is widely used as cover glass for electronic devices such as portable terminals. [0003] Chemically strengthened glass is a glass in which, for example, by contacting the glass with a molten salt containing alkali metal ions, ion exchange occurs between the alkali metal ions in the glass and the alkali metal ions in the molten salt, and compressive stress is formed on the glass surface layers of glass. [0004] In recent years, chemically strengthened glass has been used not only for display surfaces but also for housings (side or bottom) of electronic equipment. When chemically strengthened glass is used for an electronic device case, a case excellent in designability can be o...
Claims
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IPC IPC(8): C03C10/12C03B32/02C03C21/00
CPCC03B32/02C03C3/097C03C3/087C03C3/085C03C10/0027C03C21/002C03C3/083C03C4/0028
Inventor 李清小池章夫前田枝里子
Owner ASAHI GLASS CO LTD