Glasses compatible with aluminum

Details Glasses compatible with aluminum Glasses compatible with aluminum

1999-11-03

2001-04-10

Jones, Deborah (Department: 1775)

Stock material or miscellaneous articles

Composite

Of quartz or glass

C428S034000, C428S426000, C428S427000, C428S544000, C428S546000, C428S610000, C428S621000, C428S633000, C501S019000, C501S041000, C501S047000, C501S048000, C501S049000, C501S050000, C501S052000, C501S032000

Reexamination Certificate

active

06214471

ABSTRACT:

FIELD OF THE INVENTION
Aluminoborate glasses that do not react with aluminum at elevated temperatures, and articles in which such glasses are combined with aluminum.
BACKGROUND OF THE INVENTION
There are numerous applications where it is desirable to provide an aluminum film or coating on glass. These include light reflecting films, such as on mirrors and lamp envelopes, and electrically conducting films.
Such aluminum films function quite satisfactorily at ambient, or low, temperatures. However, at elevated temperatures, there is a strong tendency for aluminum to react with conventional, silicate and phosphate glasses to form the oxide, Al
2
O
3
. In silicate and phosphate glasses, the SiO
2
and P
2
O
5
are reduced to the elemental state. This, of course, is usually quite unacceptable.
Efforts to dissolve aluminum in a conventional glass, and to precipitate it out as colloidal metal, were also unsuccessful. The metal became oxidized, and incorporated in the glass composition, during batch melting.
The present invention is based on the discovery that a family of glasses is compatible with, and does not react with, aluminum, even at elevated temperatures. Accordingly, a basic purpose of the invention is to provide such family of aluminum-compatible glasses.
Another purpose is to provide glasses in which aluminum can be dissolved, and then precipitated out in colloidal form.
A further purpose is to provide a novel, polarizing glass utilizing a glass containing precipitated, aluminum metal particles.
SUMMARY OF THE INVENTION
The invention resides, in part, in a family of aluminoborate glasses that is compatible with aluminum at elevated temperatures, and that consists essentially of, as calculated in weight percent on an oxide basis, 15-85% B
2
O
3
, 5-45% Al
2
O
3
and 10-75% Li
2
O+RO, where RO represents the alkaline earth metal oxides MgO, CaO, SrO and BaO.
The invention further resides in an aluminoborate glass article having aluminum applied to the glass surface, or dispersed within the bulk glass.
The invention also resides in a polarizing, glass article comprising elongated, aluminum particles dispersed in an aluminoborate glass.


REFERENCES:
patent: 4038576 (1977-07-01), Hallais et al.
patent: 4049872 (1977-09-01), Hang
patent: 4199704 (1980-04-01), Varshneya et al.
patent: 4291107 (1981-09-01), Barry et al.
patent: 4699831 (1987-10-01), Hartmann et al.
patent: 5015530 (1991-05-01), Brow et al.
patent: 5043302 (1991-08-01), Mattox
patent: 5104738 (1992-04-01), Brow et al.
patent: 5153070 (1992-10-01), Andrus et al.
patent: 1174300 (1969-12-01), None
patent: 1-141835 (1989-06-01), None

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