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Method of forming fine grains of Co-Cr-Mo alloy with nitrogen addition and Co-Cr-Mo alloy with nitrogen addition

外国特許コード F120006131
整理番号 S2008-0597
掲載日 2012年1月6日
出願国 アメリカ合衆国
出願番号 200913060593
公報番号 20110209799
公報番号 8460485
出願日 平成21年9月2日(2009.9.2)
公報発行日 平成23年9月1日(2011.9.1)
公報発行日 平成25年6月11日(2013.6.11)
国際出願番号 JP2009065358
国際公開番号 WO2010026996
国際出願日 平成21年9月2日(2009.9.2)
国際公開日 平成22年3月11日(2010.3.11)
優先権データ
  • 特願2008-227875 (2008.9.5) JP
  • 2009WO-JP65358 (2009.9.2) WO
発明の名称 (英語) Method of forming fine grains of Co-Cr-Mo alloy with nitrogen addition and Co-Cr-Mo alloy with nitrogen addition
発明の概要(英語) (US8460485)
A Co-Cr-Mo alloy with nitrogen addition composed of 26 to 35% by weight of Cr, 2 to 8% by weight of Mo, 0.1 to 0.3% by weight of N, and balance of Co is subjected to solution treatment and then subjected to isothermal aging treatment holding the alloy at 670 to 830° C. for a predetermined period of time to form a multi-phase structure composed of an epsilon-phase and a Cr nitride by means of an isothermal aging effect.
After cooling, the alloy subjected to reverse transformation treatment in which the alloy is heated at a temperature range of 870 to 1100° C. for reverse transformation to a single gamma-phase from the multi-phase structure composed of an epsilon-phase and a Cr nitride.
特許請求の範囲(英語) [claim1]
1. A method of forming fine grains of a Co -- Cr -- Mo alloy with nitrogen addition, comprising: subjecting a Co -- Cr -- Mo alloy with nitrogen addition composed of 26 to 35% by weight of Cr, 2 to 8% by weight of Mo, 0.1 to 0.3% by weight of N, and balance of Co to a solution treatment;
subjecting the alloy to an isothermal aging treatment by holding the alloy at 670 to 830 deg. C. for a predetermined period of time to form a multi-phase structure composed of an s-phase and a Cr nitride by means of the isothermal aging treatment;
cooling the alloy; and
subjecting the alloy to a reverse transformation treatment in which the alloy is heated at a temperature range of 870 to 1100 deg. C. for reverse transformation to a single gamma -phase from the multi-phase structure composed of an s-phase and a Cr nitride.
[claim2]
2. The method of forming fine grains of a Co -- Cr -- Mo alloy with nitrogen addition according to claim 1, wherein the Co -- Cr -- Mo alloy with nitrogen addition to be subjected to the solution treatment contains 0.2% by weight or less of Ni.
[claim3]
3. The method of forming fine grains of a Co -- Cr -- Mo alloy with nitrogen addition according to claim 1, wherein the Co -- Cr -- Mo alloy with nitrogen addition to be subjected to the solution treatment contains 0.35% by weight or less of C.
[claim4]
4. The method of forming fine grains of a Co -- Cr -- Mo alloy with nitrogen addition according to claim 1, wherein the holding time of the isothermal aging treatment is 63000 seconds or more.
[claim5]
5. The method of forming fine grains of a Co -- Cr -- Mo alloy with nitrogen addition according to claim 1, wherein the reverse transformation treatment is performed at a temperature range of 920 to 1000 deg. C. for 300 seconds or more.
[claim6]
6. The method of forming fine grains of a Co -- Cr -- Mo alloy with nitrogen addition according to claim 1, wherein the reverse transformation treatment is performed at a temperature range of 1000 to 1100 deg. C. for 50 seconds or more.
[claim7]
7. The method of forming fine grains of a Co -- Cr -- Mo alloy with nitrogen addition according to claim 1, further comprising: cooling the alloy after the reverse transformation treatment: and
repeating the isothermal aging treatment and the reverse transformation treatment.
  • 発明者/出願人(英語)
  • KUROSU SHINGO
  • CHIBA AKIHIKO
  • MATSUMOTO HIROAKI
  • TOHOKU UNIVERSITY
国際特許分類(IPC)
米国特許分類/主・副
  • A61L027/04F
  • C22C019/07
  • C22F001/00
  • C22F001/10
  • K61F002/30M
  • K61F002/38
  • K61F310/00A2F
  • M21D201/03
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