| (19) |
 |
|
(11) |
EP 0 480 404 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
17.02.1993 Bulletin 1993/07 |
| (43) |
Date of publication A2: |
|
15.04.1992 Bulletin 1992/16 |
| (22) |
Date of filing: 09.10.1991 |
|
|
| (84) |
Designated Contracting States: |
|
DE FR GB |
| (30) |
Priority: |
09.10.1990 JP 271627/90
10.04.1991 JP 77763/91
05.06.1991 JP 134258/91
|
| (71) |
Applicant: DAIDO TOKUSHUKO KABUSHIKI KAISHA |
|
Naka-ku
Nagoya-shi
Aichi-ken (JP) |
|
| (72) |
Inventors: |
|
- Yahagi, Shinichiro
Ohbu-shi,
Aichi-ken (JP)
- Yamada, Hiroshi
Nagoya-shi,
Aichi-ken (JP)
- Funao, Kikuichi
Tokai-shi,
Aichi-ken (JP)
- Iwane, Fumio
Nagoya-shi,
Aichi-ken (JP)
|
| (74) |
Representative: Kraus, Walter, Dr. et al |
|
Patentanwälte Kraus, Weisert & Partner
Thomas-Wimmer-Ring 15
D-80539 München
D-80539 München (DE) |
|
| |
|
| (54) |
Corrosion-resistant and heat-resistant metal composite and method of producing |
(57) A metal composit is prepared by covering at least a part of the surface of a substrate,
typically a sheet of an Fe-based alloy or steel with Al or an Al-alloy dirctly or
with an intermediate layer of Ni, annealing the covered material under vacuum or in
an inert gas atmosphere, and heating in an oxidizing atmosphere to form an internal
layer of inermetallic compouds and a surface portecting layer of Al2O3. In case of
direct covering with Al or Al-alloy,there will occur intermetallic compounds, Fe3Al
and/or FeAl, and in case of using an Ni sheet as the intermediate layer, intermetallic
compounds, Ni3Al and/or NiAl Nb may be used in place of Ni. As the substrate, Ni or
a Ni-alloy containing more than 20 weight % of Ni may be used. The substrate may be
in the form of wire
The product metal composit has improved high temperature corrosion resistance and
chemical resistance as wee as good processability, and is paticularly useful for electric
heater material and catalyst carrier of automobile exhaust gas cleaners.