Refractory partially crystalline materials with good visible tra

Details Refractory partially crystalline materials with good visible tra Refractory partially crystalline materials with good visible tra

1976-06-18

1977-09-13

Bashore, S. Leon

Compositions: coating or plastic

Coating or plastic compositions

Marking

65 33, C03C 322, C03B 3200

Patent

active

040479609

ABSTRACT:
This invention is concerned with the manufacture of refractory articles of a partially crystalline nature, i.e., materials having a substantial crystal content within a glassy matrix, but wherein the crystal phase normally comprises less than about 50% by volume of the materials. The bodies are produced through the heat treatment of glass articles having compositions within the Al.sub.2 O.sub.3 --SiO.sub.2 --TiO.sub.2 --Nb.sub.2 O.sub.5 and/or Ta.sub.2 O.sub.5 system at elevated temperatures, but not in excess of about 1150.degree. C., to cause the in situ growth of crystals. The materials, containing aluminum niobate, aluminum tantalate, or an aluminum niobate-tantalate solid solution as the predominant crystal phase, exhibit a high degree of transparency to visible light, and retain that transparency even after very extended exposures to temperatures up to in excess of 1000.degree. C. That capability has recommended their utility as arc-tubes or as envelopes for high temperature lamps.

REFERENCES:
patent: 3732116 (1973-05-01), Reade
patent: 3839053 (1974-10-01), Rittler
patent: 3951670 (1976-04-01), Bush
patent: 3977886 (1976-08-01), Muller
patent: 3984251 (1976-10-01), Rapp

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