Compositions – Inorganic luminescent compositions – Tungsten containing
Patent
1972-03-24
1977-07-26
Brammer, Jack P.
Compositions
Inorganic luminescent compositions
Tungsten containing
23273R, 423490, F21V 900, G02B 520, G02C 710
Patent
active
040382010
ABSTRACT:
Polycrystalline optical materials formed from halides of alkali and alkaline-earth metals and of other metals, and mixtures thereof, some of which contain selected additives to act as nucleators and grain-growth regulators, and also apparatus and method of producing these materials from a liquid melt are disclosed. The polycrystalline products have optical transmissions approaching those of single-crystal materials, but exhibit significantly higher resistance to thermal and mechanical shock.The disclosed method and apparatus allows formation of unshattered polycrystalline ingots of any desired size by uniform nucleation from a homogeneous melt, and involves the controlled uniform removal of heat from the solidifying mass alone or in combination with a continuous addition-solidification process, which results in the formation of a substantially clear polycrystalline body or ingot, free of voids, and composed of randomly oriented single crystal having grain growths in a range of from about 0.01 to 10 mm. cross dimension.
REFERENCES:
patent: 3453215 (1969-07-01), Carroll, Jr. et al.
Kodak Istran Infrared Materials, Kodak Publication U-72 (1971), pp. 7-10.
Brammer Jack P.
Optovac, Inc.
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