Ultra-low expansion ceramic articles
US3958058A · kind A · utility
25Cited by
10References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 29, 1974 |
| Grant date | May 18, 1976 |
| Priority date | — |
| Expiry date | Jul 29, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/268
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Ultra-low expansion ceramic articles, having average linear coefficients of thermal expansion below about 5.4 .times. 10.sup.-.sup.7 /.degree.C over the range from room temperature to 1000.degree.C, are produced by removal of MgO and Al.sub.2 O.sub.3 from cordierite articles by acid leaching to produce ceramic articles having oxide compositions in the range of about 55-75% SiO.sub.2, 18-32% Al.sub.2 O.sub.3, and 7-13% MgO which are characterized by the presence of a major amorphous silica-rich phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.