Compositions: coating or plastic – Coating or plastic compositions – Marking
Patent
1976-03-25
1977-04-19
Douglas, Winston A.
Compositions: coating or plastic
Coating or plastic compositions
Marking
156 398, C03C 322, C03C 304
Patent
active
040186121
ABSTRACT:
This invention is concerned with the production of highly-crystalline, transparent glass-ceramic articles, wherein the predominant crystal phase is a beta-quartz solid solution, and which exhibit transmittances of infra-red radiations in excess of 75%, and, frequently in excess of 85%, at a wave length of 2.5 microns in articles having cross sections of about 3 mm. The articles also demonstrate excellent resistance to attack by acids and detergents, and possess coefficients of thermal expansion over the range of room temperature (R.T.) to 600.degree. C. of less than 10 .times. 10.sup.-.sup.7 /.degree. C. Compositions operable in the invention are encompassed within a very narrow range of the Li.sub.2 O--MgO--ZnO--Al.sub.2 O.sub.3 --SiO.sub.2 quinary nucleated with a combination of TiO.sub.2 + ZrO.sub.2. Where desired, coloring agents conventional in the glass art can be added to yield colored, transparent, glass-ceramic articles.
REFERENCES:
patent: 3113009 (1963-12-01), Brown et al.
patent: 3252811 (1966-05-01), Beall
patent: 3625718 (1971-12-01), Petticron
patent: 3677785 (1972-07-01), Horikawa et al.
patent: 3775154 (1973-11-01), Grego et al.
patent: 3928229 (1975-12-01), Neuroth
Bell Mark
Corning Glass Works
Douglas Winston A.
Janes Jr. Clinton S.
Patty, Jr. Clarence R.
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