Method of coating porous ceramic structures with .gamma.-alumina
US4746537A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1987 |
| Grant date | May 24, 1988 |
| Priority date | — |
| Expiry date | Jul 13, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J21/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of applying .gamma.-alumina to a porous ceramics structure includes the steps of: causing fine particles of .gamma.-alumina together with a carrier gas to flow through pores in the porous ceramics structure so as to deposit the .gamma.-alumina fine particles on the surfaces of the skeleton of the porous ceramics structure, and heating the structure with the .gamma.-aluminum particles deposited thereto to a predetermined temperature thereby fixing the .gamma.-alumina particles. The fine particles of .gamma.-alumina are formed by causing an arc discharge between the surface of molten aluminum and an aluminum electrode so as to generate vapor of aluminum, and oxidizing the aluminum vapor by an oxidizing gas which may be Ar-O.sub.2 carrier gas which is made to flow through the pores in the porous ceramics structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.