Title:
METHOD FOR PRODUCING OPAQUE QUARTZ GLASS
Document Type and Number:
WIPO Patent Application WO/2020/121511
Kind Code:
A1
Abstract:
[Problem] To facilitate production of large spherical opaque quartz glass ingots which have excellent heat ray shielding properties and light shielding properties, have a small air bubble size, and have excellent mechanical strength without using any forming agent. [Solution] In the present invention, opaque quartz glass having a small air bubble size and high mechanical strength can be obtained by: preparing a slurry having a silica powder concentration of 45 to 75 wt% by dispersing silica powder in water; wet grinding the silica powder to adjust the average particle size and the standard deviation of the particle size to 8 µm or less and 6 µm or less, respectively; spray dry granulating the slurry; and melting the granulated powder.
Inventors:
ITO CHIEMI (JP)
MUTOU TAKESHI (JP)
SATO MASAHIRO (JP)
SUZUKI TAKAYA (JP)
KUNIYOSHI MINORU (JP)
MUTOU TAKESHI (JP)
SATO MASAHIRO (JP)
SUZUKI TAKAYA (JP)
KUNIYOSHI MINORU (JP)
Application Number:
PCT/JP2018/046059
Publication Date:
June 18, 2020
Filing Date:
December 14, 2018
Export Citation:
Assignee:
TOSOH QUARTZ CORP (JP)
International Classes:
C03B20/00; C03C11/00
Domestic Patent References:
| WO2017103120A1 | 2017-06-22 |
Foreign References:
| JPH0465328A | 1992-03-02 | |||
| JP2014088286A | 2014-05-15 |
Attorney, Agent or Firm:
ISHII Yoshikazu (JP)
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