Transparent, infra-red transmitting glass-ceramics

Compositions: coating or plastic – Coating or plastic compositions – Marking

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C03C 322, C03C 304

Patent

active

040090426

ABSTRACT:
The instant invention relates to the production of highly-crystalline, transparent glass-ceramic articles wherein the predominant crystal phase is a beta-quartz solid solution and which demonstrate transmittances of infra-red radiations up to about 80% at a wavelength of 3.5 microns in bodies having thickness dimensions of about 4 mm. The articles of the invention have compositions within a very narrow area of the Li.sub.2 O--Al.sub.2 O.sub.3 --SiO.sub.2 field, nucleated with TiO.sub.2, and wherein some of the silica is replaced with AlPO.sub.4. Minor additions of ZrO.sub.2 enhance the chemical durability of the articles and, if desired, coloring agents can be added to yield colored, transparent, crystalline articles.

REFERENCES:
patent: 3282712 (1966-11-01), Tashiro
patent: 3642504 (1972-02-01), Petzold

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