Title:
GLASS CERAMICS AND PRODUCTION THEREOF
Document Type and Number:
Japanese Patent JP3226341
Kind Code:
B2
Abstract:
PURPOSE: To improve machinability with a low thermal expansion coefficient and a small quantity of an adsorbed and a desorbed gas by including fluorphlogopite crystallites and Li2O-Al2O3-SiO2-based crystallites in a glass matrix.
CONSTITUTION: Alkoxide compounds and fluorine compounds of various metallic components are dissolved in a polar solvent so as to provide 30-70wt.% SiO2 component, 10-25wt.% Al2O3 component, 7-25wt.% MgO component, 2-12wt.% K2O component, 1-7wt.% Li2O component and 1-15wt.% F component. A B2O3 component in an amount of 1-10wt.% is then added to the resultant solution and water is further added to hydrolyze the compounds. The prepared hydrolyzate is subsequently dried at 25-130°C and heat-treated at 500-1050°C to afford the objective glass ceramics, containing 10-60wt.% fluorphlogopite crystallites and 10-50wt.% Li2O-Al2O3-SiO2-based crystallites in the glass matrix and having 4.0×10-6 to 6.0×10-6/°C thermal expansion coefficient (25-280°C) and 1×10-9 to 10×10-9atm.cc/see quantity of adsorbed and desorbed He.
Inventors:
Toshio Hamasaki
Fukunaga Kiyofumi
Osamu Tamura
Fukunaga Kiyofumi
Osamu Tamura
Application Number:
JP21741992A
Publication Date:
November 05, 2001
Filing Date:
July 24, 1992
Export Citation:
Assignee:
Mitsui Mining Co., Ltd.
International Classes:
C01B13/32; C03C10/16; H01L23/15; (IPC1-7): C03C10/16; C01B13/32; H01L23/15
Domestic Patent References:
| JP1115848A | ||||
| JP60215548A |
Attorney, Agent or Firm:
Yasuyo Takahata
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