Thermally stable quartz glass
US4104045A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1976 |
| Grant date | Aug 1, 1978 |
| Priority date | — |
| Expiry date | Jul 6, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C2203/22
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Quartz glass of high thermal stability is produced from a SiO.sub.2 solution or sol which is substantially free of alkali and alkaline earth metal oxides and contains chromium and/or manganese in about 0.05 to 20% by weight of the SiO.sub.2 expressed as Cr.sub.2 O.sub.3 and Mn.sub.2 O.sub.3. The quartz glass upon heating above 1100.degree. C forms cristobalite having an average crystallite size of about 100 to 500 A. Articles therefrom retain their physical and mechanical properties at high temperatures. The materials are suited for producing fibers by the usual methods of spinning from solutions or sols and, as such, or as fibers they are suited for use in reinforcement and insulation and in making flameproof textiles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.