| (19) |
 |
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(11) |
EP 1 640 469 A8 |
| (12) |
CORRECTED EUROPEAN PATENT APPLICATION |
|
published in accordance with Art. 158(3) EPC |
| (15) |
Correction information: |
|
Corrected version no 1 (W1 A1) |
| (48) |
Corrigendum issued on: |
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19.07.2006 Bulletin 2006/29 |
| (43) |
Date of publication: |
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29.03.2006 Bulletin 2006/13 |
| (22) |
Date of filing: 24.06.2004 |
|
| (51) |
International Patent Classification (IPC):
|
| (86) |
International application number: |
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PCT/JP2004/008880 |
| (87) |
International publication number: |
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WO 2005/001150 (06.01.2005 Gazette 2005/01) |
|
| (84) |
Designated Contracting States: |
|
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
|
| (30) |
Priority: |
27.06.2003 JP 2003183802
27.06.2003 JP 2003183803
|
| (71) |
Applicant: Mitsubishi Materials PMG Corporation |
|
Niigata-shi,
Niigata
9508064 (JP) |
|
| (72) |
Inventors: |
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- KAWASE, Kinya
c/o Mitsubishi Materials Corporation
Niigata-shi,
Niigata 950-8064 (JP)
- NAKAI, Takashi
c/oMitsubishi Materials Corporation
Niigata-shi,
Niigata 950-8064 (JP)
|
| (74) |
Representative: HOFFMANN EITLE |
|
Patent- und Rechtsanwälte
Arabellastrasse 4
81925 München
81925 München (DE) |
|
| |
|
| (54) |
IRON BASE SINTERED ALLOY EXHIBITING HIGH SURFACE DENSIFICATION AND HIGH SURFACE HARDNESS,
AND METHOD FOR PRODUCTION THEREOF |
(57) An iron base sintered alloy having highly densified and hardened surface and a producing
method thereof are provided. The iron base sintered alloy includes an iron base sintered
alloy surface layer portion having a thickness in a range of 1 µm to 2 mm from a surface
of the iron base sintered alloy and containing K and/or Na in an average concentration
of 0.0001 to 1 mass%, or having an average concentration of P higher than a concentration
of P in an iron base sintered alloy inner portion located inside the iron base sintered
alloy surface layer portion and containing K and/or Na in an average concentration
of 0.0001 to 1 mass%.