Manufacturing method for phase-separated glass, and phase-separated glass

Patent metadata

Field	Value
Publication number	US-9580353-B2
Application number	US-201514685131-A
Country	US
Kind code	B2
Filing date	Apr 13, 2015
Priority date	Oct 12, 2012
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

The present invention relates to a method for producing phase-separated glass, sequentially including a melting step of melting a glass, a phase separation step of separating phases in the glass, and a shaping step of shaping the glass, and to the phase-separated glass obtained by the production method.

First claim

The invention claimed is:

1. A method for producing phase-separated glass, the method comprising:
melting a glass to obtain a molten glass;
separating phases in the molten glass to obtain a phase-separated glass; and
shaping the phase-separated glass.

2. The method according to claim 1 ,
wherein the glass is stirred between the melting and the separating or during the separating.

3. The method according to claim 1 ,
wherein, in the separating, phases are separated by holding the glass at a temperature of a phase separation initiation temperature or lower and higher than 1,200° C.

4. The method according to claim 3 ,
wherein a holding time of the glass at the temperature of the phase separation initiation temperature or lower and higher than 1,200° C. is 1 minute or longer and 6 hours or shorter.

5. The method according to claim 3 ,
wherein a viscosity of the glass at a temperature of from the phase separation initiation temperature or lower and higher than 1200° C. is 10 2 dPa·s or more and 10 6 dPa·s or less.

6. The method according to claim 1 ,
wherein the glass is an alkali silicate glass and comprises a total of 6% by mass or more of Na 2 O and K 2 O and 0.5% by mass or more of P 2 O 5 .

7. The method according to claim 1 ,
wherein the glass comprises at least one of CaO and BaO, and a total content of CaO and BaO is less than 6% by mass.

8. The method according to claim 1 ,
wherein the glass comprises, in terms of an oxide-based mole percentage, SiO 2 in a range of 50% to 80%, Al 2 O 3 in a range of 0% to 10%, B 2 O 3 in a range of 0% to 7%, MgO in a range of 2% to 30%, at least one selected from ZrO 2 , P 2 O 5 , TiO 2 , and La 2 O 3 in a range of 0.5% to 10% in total, and Na 2 O in a range of 1% to 17%.

9. The method according to claim 1 ,
wherein the glass comprises, in terms of an oxide-based mole percentage, SiO 2 in a range of 50% to 80%, Al 2 O 3 in a range of 0% to 10%, B 2 O 3 in a range of 0% to 4%, MgO in a range of 5% to 30%, at least one selected from ZrO 2 , P 2 O 5 , TiO 2 , and La 2 O 3 in a range of 0.5% to 10% in total, and Na 2 O in a range of 1% to 17%.

10. The method according to claim 1 ,
wherein a light transmittance at a thickness of 1 mm and at each wavelength of a wavelength of 800 nm, a wavelength of 600 nm, and a wavelength of 400 nm is 50% or less.

11. The method according to claim 1 ,
wherein a light transmittance at a thickness of 1 mm and at a wavelength of 1,000 nm is 50% or less.

12. The method according to claim 1 ,
wherein a ratio of a maximum value Tmax to a minimum value Tmin of a light transmittance at a thickness of 1 mm and at a wavelength in a range of 800 nm to 400 nm is 50 or less.

13. A method for producing chemically-strengthened glass, the method comprising:
carrying out an ion exchange treatment on a phase-separated glass produced by the method according to claim 1 .

14. The method according to claim 13 ,
wherein a light transmittance at a thickness of the chemically-strengthened glass of 1 mm and at each wavelength of a wavelength of 800 nm, a wavelength of 600 nm, and a wavelength of 400 nm is 50% or less.

15. A method for producing an electronic device chassis, the method comprising:
introducing a chemically-strengthened glass into the electronic device chassis,
wherein the chemically-strengthened glass is produced by the method according to claim 13 .

Assignees

• Asahi Glass Co Ltd

Inventors

• Miyasaka Junko
• Ohara Seiki
• Sakagami Takahiro

Classifications

• C03C10/0054 Primary

  containing PbO, SnO2, B2O3 · CPC title

• C03B5/23

  Cooling the molten glass (C03B5/18, C03B5/225 take precedence) · CPC title

• C03C21/002

  to perform ion-exchange between alkali ions (C03C21/005 takes precedence) · CPC title

• Y02P40/57

  Improving the yield, e-g- reduction of reject rates · CPC title

• C03C2204/04

  Opaque glass, glaze or enamel · CPC title