Title:
COBALT-CHROMIUM ALLOY MEMBER, METHOD FOR PRODUCING SAME, AND MEDICAL OR AEROSPACE DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/014564
Kind Code:
A1
Abstract:
Provided is a cobalt-chromium alloy member suitable for use in a medical or aerospace device. According to the present invention, a cobalt-chromium alloy raw material comprises a composition containing, in terms of mass%, 23-32% of Ni, 37-48% of Co and 8-12% of Mo, with the remainder comprising Cr and unavoidable impurities, and satisfying the relationship 20 ≤ [Cr%]+[Mo%]+[unavoidable impurities%] ≤ 40. The cobalt-chromium alloy raw material is subjected to cold plastic working into a prescribed shape so as to obtain a worked cobalt-chromium alloy material, and the worked cobalt-chromium alloy material is heat treated for a period of 1-60 minutes at a temperature greater than the recrystallization temperature of the cobalt alloy raw material and not more than 1100ºC so as to obtain a cobalt-chromium alloy member which has a tensile strength of 800-1200 MPa, a uniform elongation of 20-60% and a breaking elongation of 25-80%.
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Inventors:
TSUCHIYA KOICHI (JP)
SAWAGUCHI TAKAHIRO (JP)
SAWAGUCHI TAKAHIRO (JP)
Application Number:
PCT/JP2021/026241
Publication Date:
January 20, 2022
Filing Date:
July 13, 2021
Export Citation:
Assignee:
NAT INST MATERIALS SCIENCE (JP)
International Classes:
C22C30/00; A61L27/04; A61L29/02; A61L31/02; C22F1/00; C22F1/16
Foreign References:
| JP2019147982A | 2019-09-05 | |||
| JP2009074104A | 2009-04-09 | |||
| JP2004307993A | 2004-11-04 |
Other References:
OTOMO TAKUMA, MATSUMOTO HIROAKI, NOMURA NAOYUKI, CHIBA AKIHIKO: "Influence of Cold-Working and Subsequent Heat-Treatment on Young’s Modulus and Strength of Co-Ni-Cr-Mo Alloy", MATERIALS TRANSACTIONS, THE JAPAN INSTITUTE OF METALS AND MATERIALS, 1 March 2010 (2010-03-01), pages 434 - 441, XP055898755, Retrieved from the Internet DOI: 10.2320/matertrans.M2009327
Attorney, Agent or Firm:
MINAMI AOYAMA PATENT AND TRADEMARK ATTORNEYS (JP)
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