Title:
COPPER ALLOY AND METHOD FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2005/028689
Kind Code:
A1
Abstract:
A copper alloy which comprises two or more of Cr, Ti and Zr, the balance being Cu and impurities, wherein the particle diameter (X)(µm) of precipitates and inclusions being present in the alloy and having a particle diameter of 1 µm or more and the total number (N) (pieces/mm2) of the precipitates and inclusions satisfy the following formula (1): log N ≤ 0.4742 + 17.629 X exp (-0.1133 x X). The copper alloy may further comprise Ag, P, Mg or the like in place of a part of Cu. A method for producing the above copper alloy which comprises cooling a cast pieces at a cooling rate of 0.5°C/s or more at least in the temperature range from the temperature immediately after the casting to 450°C. It is desirable that after the cooling the cast piece is worked in the temperature range of 600°C or lower or is subjected to a heat treatment wherein it is held in the temperature range of 150 to 750 °C for 30 sec or longer. It is most desirable that the work and the heat treatment are repeated.
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Inventors:
MAEHARA YASUHIRO (JP)
YONEMURA MITSUHARU (JP)
MAEDA TAKASHI (JP)
NAKAJIMA KEIJI (JP)
NAGAMICHI TSUNEAKI (JP)
YONEMURA MITSUHARU (JP)
MAEDA TAKASHI (JP)
NAKAJIMA KEIJI (JP)
NAGAMICHI TSUNEAKI (JP)
Application Number:
PCT/JP2004/013439
Publication Date:
March 31, 2005
Filing Date:
September 15, 2004
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
MAEHARA YASUHIRO (JP)
YONEMURA MITSUHARU (JP)
MAEDA TAKASHI (JP)
NAKAJIMA KEIJI (JP)
NAGAMICHI TSUNEAKI (JP)
MAEHARA YASUHIRO (JP)
YONEMURA MITSUHARU (JP)
MAEDA TAKASHI (JP)
NAKAJIMA KEIJI (JP)
NAGAMICHI TSUNEAKI (JP)
International Classes:
B22D21/02; C22F1/08; B22D23/00; C22C9/00; C22F1/00; (IPC1-7): C22C9/00
Foreign References:
| JPS59193233A | 1984-11-01 | |||
| JPS63303020A | 1988-12-09 | |||
| JP2572042B2 | 1997-01-16 | |||
| JP2714561B2 | 1998-02-16 | |||
| JP2002285261A | 2002-10-03 | |||
| EP0485627A1 | 1992-05-20 | |||
| JPS59193233A | 1984-11-01 |
Other References:
COPPER; COPPER: "Alloy Product Data Book", 1 August 1997, JAPAN COPPER AND BRASS ASSOCIATION, pages: 328 - 355
"Industrial Heating", vol. 36, 1999, JAPAN INDUSTRIAL FURNACE MANUFACTURERS ASSOCIATION, pages: 59
"Industrial Heating", vol. 36, 1999, JAPAN INDUSTRIAL FURNACE MANUFACTURERS ASSOCIATION, pages: 59
Attorney, Agent or Firm:
Honoue, Terutada (17-23 Higashinaniwa-cho 5-chome, Amagasaki-sh, Hyogo 92, JP)
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