Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1997-07-03
1999-10-26
Speer, Timothy
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
4283126, 428398, 428426, 428446, 65 173, 65 22, 65 321, 501 84, B32B 1700
Patent
active
059724889
ABSTRACT:
Opaque quartz glass is provided which contains gas bubbles uniformly dispersed therein and is excellent in high-temperature viscosity and heat-insulating property. The opaque quartz glass has a defined apparent density, contains bubbles having a defined average bubble diameter in a defined amount, has a defined total bubble sectional area, generally exhibits a defined linear transmittance at a thickness of 1 mm or larger to projected light of a defined wavelength and contains nitrogen in a defined concentration. The opaque quartz glass is produced by a process comprising packing into a mold a powdery source material of powdery silica having a defined average particle diameter and powdery silicon nitride dispersed therein in a defined amount, heating the powdery source material to one of two first defined temperature ranges (both under vacuum) and further heating the source material up to a second temperature higher than the melting point and not higher than 1900.degree. C. in a vacuum or an inert gas atmosphere for vitrification and bubble formation.
REFERENCES:
patent: 5585173 (1996-12-01), Kamo
patent: 5736206 (1998-04-01), Englisch
patent: 5772714 (1998-06-01), Sato
Kudo Masayuki
Nagata Hiroya
Tsukuma Koji
Speer Timothy
Tosoh Corporation
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