| (19) |
 |
|
(11) |
EP 0 471 505 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
16.09.1992 Bulletin 1992/38 |
| (43) |
Date of publication A2: |
|
19.02.1992 Bulletin 1992/08 |
| (22) |
Date of filing: 07.08.1991 |
|
|
| (84) |
Designated Contracting States: |
|
BE DE ES FR GB IT NL |
| (30) |
Priority: |
11.08.1990 GB 9017639
|
| (71) |
Applicant: JOHNSON MATTHEY PUBLIC LIMITED COMPANY |
|
London EC1N 8JP (GB) |
|
| (72) |
Inventors: |
|
- Coupland, Duncan Roy
High Wycombe,
Buckinghamshire HP11 1EA (GB)
- McCabe, Andrew Robert
Headington,
Oxford OX3 7AG (GB)
|
| (74) |
Representative: Wishart, Ian Carmichael et al |
|
Patents Department
Johnson Matthey Technology Centre
Blounts Court
Sonning Common
Reading, Berks RG4 9NH
Reading, Berks RG4 9NH (GB) |
|
| |
|
| (54) |
Coated article, its use and method of making the same |
(57) An article for use in high temperature corrosive environments is protected by successive
coatings. The coatings comprise
i) a first coating of one or more metals or alloys,
ii) an optional second coating of a mixture of one or more ceramics and one or more
metals or alloys,
iii) a third coating of one or more ceramics, and
iv) a fourth coating of one or more precious metals or alloys thereof, the fourth
coating being substantially non-porous.