Doped quartz glass, and enclosures for electrical apparatus made

Details Doped quartz glass, and enclosures for electrical apparatus made Doped quartz glass, and enclosures for electrical apparatus made

1994-11-23

1996-07-02

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C03C 306

Patent

active

055321950

ABSTRACT:
Soft quartz glass having low viscosity and a low thermal coefficient of expansion, high electrical insulation capability and free from release of contaminants, when used as a bulb of an incandescent lamp or as an envelope in an arc vessel of a discharge lamp, is a quartz glass made of ultra-pure quartz (SiO.sub.2), for example having a purity of 99.99 mol-%, doped with stoichiometric compounds of alkaline earth oxides with boron oxide, optionally also with a small quantity of Al.sub.2 O.sub.3 in an overall quantity of the doping substance of between about 0.05% to 0.8%, by weight.

REFERENCES:
patent: 2255558 (1941-09-01), Dalton
patent: 3113855 (1963-12-01), Elmer
patent: 3472667 (1969-10-01), Wagstaff
patent: 3923533 (1975-12-01), Hammel et al.
patent: 4336048 (1982-06-01), van der Steen et al.
patent: 4508991 (1985-04-01), Wurster et al.
patent: 4605632 (1986-08-01), Elmer
patent: 4749902 (1988-06-01), Weiss
Derwent Abstract of JP-A-59-003,042 of Toshiba Ceramics K.K., entitled "Ibsorbing quartz glass transp. to visible light," published 9 Jan. 1984, based on application 82-107,253 filed 24 Jun. 1982; Derwent accession No. 84-040,297.

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