Thermal shock and creep resistant mullite articles prepared from topaz and process of manufacture
US5173349A · kind A · utility
40Cited by
6References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 16, 1990 |
| Grant date | Dec 22, 1992 |
| Priority date | — |
| Expiry date | Aug 16, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/259
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for forming a shaped article comprised of mullite whiskers comprising the following steps: PA1 a. preparing a mixture of aluminum fluoride and silicon dioxide in a weight ratio of about 7:3; PA1 b. firing the mixture in air at a temperature above about 750.degree. C. until complete conversion to topaz takes place; PA1 c. mixing the topaz product of step (b) with silicon dioxide in a weight ratio of about 18:1 together with a binder and firing at a temperature of above about 1400.degree. C. until complete conversion to mullite occurs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.