Porous cordierite compositions with improved thermal expansion characteristics
US5021373A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1990 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | Mar 2, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/195
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Cordierite compositions having increased porosity and improved thermal expansion characteristics are disclosed. The cordierite compositions comprise from about 0.025 to about 1.5 percent by weight germanium dioxide and exhibit reduced CTE. The cordierite compositions are made by heating a mixture of kaolin, talc, alumina, kyanite and germanium dioxide to temperatures of between 1350.degree. and 1475.degree.C. The cordierite compositions are preferably made from a mixture which includes a calcined material, such as calcined talc, so that the mixture is more easily processed and the resulting cordierite compositions are more porous, and thus, more easily coated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.