Fabrication of homogenous sol-gel derived multiphase materials using gelling control agents
US5160455A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1987 |
| Grant date | Nov 3, 1992 |
| Priority date | — |
| Expiry date | Sep 8, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/95
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of preparing a composite of a metal oxide matrix with reinforcement particles distributed therein in gel form, by preparing a sol of a metal oxide of Al.sub.2 O.sub.3, SiO.sub.2, MgO, ZrO.sub.2, Y.sub.2 O.sub.3 and mixtures thereof, bringing the sol near the point of gelation, adding reinforcement material consisting of Al.sub.2 O.sub.3, SiC, SiO.sub.2, MgO, ZrO.sub.2, Y.sub.2 O.sub.3 and mixtures thereof in particulate form in an amount from about 5% by volume to about 90% by volume, and adding a control gelling agent in the form of an aqueous solution of a metal salt consisting of aluminum nitrate, magnesium nitrate, zirconium nitrate, chromium nitrate, silicon nitrate, neodymium nitrate and mixtures thereof in an amount corresponding to from about 1% to about 5% by weight of the metal salt based on the metal oxide in the sol to promote controlled gelation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.