Process for the production of fine-grained ceramic bodies molded containing Al.sub.2 O.sub.3
US5607630A · kind A · utility
Inventor
Key dates
| Filing date | Sep 30, 1994 |
| Grant date | Mar 4, 1997 |
| Priority date | — |
| Expiry date | Sep 30, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/65
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A ceramic moulded body containing at least 10 vol. % fine-grained Al.sub.2 O.sub.3, and a process for its production PA0 (a) milling aluminium metal in powder form alone or together with Al.sub.2 O.sub.3 or/and if desired further suitable inorganic substances for ceramic formation in a non-aqueous liquid in the presence of oxygen until 10 to 80% of the metallic aluminium powder has reacted to form one or several aluminium oxidation precursors from the group amorphous Al.sub.2 O.sub.3, .gamma.-Al.sub.2 O.sub.3 and aluminium-organic compounds and the powder has a maximum oxidation rate between 510.degree. and 610.degree. C. according to differential thermoanalytical measurement; PA0 (b) molding the powder of step (a) into a green body; PA0 (c) slowly heating the green body in an atmosphere containing oxygen to a temperature which is below the melting temperature of aluminium until at least 50% of the metallic aluminium powder remaining after the milling has reacted to Al.sub.2 O.sub.3 ; and subsequently PA0 (d) sintering the moulded body at 1100.degree. to 1650.degree. C. or PA0 (e) applying the powder obtained in step (a) onto a substrate by means of flame or plasma spraying in the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.