TOP > 外国特許検索 > Cobalt-base alloy with high heat resistance and high strength and process for producing the same

Cobalt-base alloy with high heat resistance and high strength and process for producing the same

外国特許コード F110005228
整理番号 A281-06WO
掲載日 2011年8月26日
出願国 アメリカ合衆国
出願番号 03688008
公報番号 20080185078
公報番号 8551265
出願日 平成20年2月25日(2008.2.25)
公報発行日 平成20年8月7日(2008.8.7)
公報発行日 平成25年10月8日(2013.10.8)
優先権データ
  • 特願2005-267964 (2005.9.15) JP
  • 2006WO-JP317939 (2006.9.5) WO
発明の名称 (英語) Cobalt-base alloy with high heat resistance and high strength and process for producing the same
発明の概要(英語) (US8551265)
A Co-base alloy which has a basic composition including, in terms of mass proportion, 0.1%-10% Al, 3.0-45% W, and Co as the remainder and has an intermetallic compound of the Ll2 type [Co3(Al,W)] dispersed and precipitated therein.
Part of the Co may be replaced with Ni, Ir, Fe, Cr, Re, or Ru, while part of the Al and W may be replaced with Ni, Ti, Nb, Zr, V, Ta or Hf.
The intermetallic compound [Co3(Al, W)] has a high melting point, and this compound and the matrix are mismatched little with respect to lattice constant.
Thus, the cobalt-base alloy can have high-temperature strength equal to that of nickel-base alloys and excellent structure stability.
特許請求の範囲(英語) [claim1]
1. A cobalt-base alloy with high heat resistance and high strength comprising: in a cobalt-base alloy comprising a composition of, in terms of mass proportion, 0.1 to 10% of Al, 3.0 to 45% of W, and Co as a remainder containing indispensable impurities, a metal texture in which a Ll2-type intermetallic compound (gamma ' phase) of Co3(Al, W) by atom ratio is precipitated, the Ll2-type intermetallic compound is precipitated under conditions where the particle diameter is 10 nm to 1 mu m and the precipitation amount is 40 to 85% by volume, and the mismatch of the lattice constant between the gamma ' phase and matrix (y phase) is 0.5% or less.
[claim2]
2. A cobalt-base alloy with high heat resistance and high strength, produced by the steps of: solution-treating the cobalt-base alloy with the composition according to claim 1 in the temperature range of 1100-1400 deg. C. for 1-2 hours; and
performing aging treatment in the temperature range of 500-1100 deg. C. for 1-168 hours.
[claim3]
3. The cobalt-base alloy with high heat resistance and high strength according to claim 1, further comprising: one or more components selected from the following
Group (I) in a total of 0.001 to 2.0% by mass, wherein
Group (I): 0.001 to 1% of B, 0.001 to 2.0% of C, 0.01 to 1.0% of Y, and 0.01 to 1.0% of La or misch metal.
[claim4]
4. A cobalt-base alloy with high heat resistance and high strength produced by the steps of: solution-treating the cobalt-base alloy with the composition according to claim 3 in the temperature range of 1100-1400 deg. C. for 1-2 hours; and
performing aging treatment in the temperature range of 500-1100 deg. C. for 1-168 hours.
[claim5]
5. The cobalt-base alloy with high heat resistance and high strength according to claim 1, further comprising: one or more components selected from the following Group (II) in a total of 0.1 to 50%;
wherein an Ll2-type intermetallic compound precipitated is (Co,X)3(Al,W,Z) by atom ratio;
wherein, X is Ir, Fe, Cr, Re, and/or Ru, Z is Mo, Ti, Nb, Zr, V, Ta, and/or Hf, and nickel can be comprised in both X and Z; and Group (II): 50% or less of Ni, 50% or less of Ir, 10% or less of Fe, 20% or less of Cr, 15% or less of Mo, 10% or less of Re, 10% or less of Ru, 10% or less of Ti, 20% or less of Nb, 10% or less of Zr, 10% or less of V, 20% or less of Ta, and 10% or less of Hf.
[claim6]
6. A cobalt-base alloy produced by the steps of: solution-treating the cobalt-base alloy according to claim 5 in the temperature range of 1100 to 1400 deg. C. for 1 to 2 hours; and
performing aging treatment in the temperature range of 800 to 1000 deg. C. for 1 to 168 hours.
[claim7]
7. The cobalt-base alloy with high heat resistance and high strength according to claim 1, further comprising: one or more components selected from the following Group (I) in a total of 0.001 to 2.0%; and
one or more components selected from the following Group (II) in a total of 0.1 to 50%;
wherein the Ll2-type intermetallic compound precipitated is (Co,X)3(Al,W,Z) by atom ratio; wherein, X is Ir, Fe, Cr, Re, and/or Ru, Z is Mo, Ti, Nb, Zr, V, Ta, and/or Hf, and nickel can be comprised in both X and Z;
Group (I): 0.001 to 1% of B, 0.001 to 2.0% of C, 0.01 to 1.0% of Y, and 0.01 to 1.0% of La or misch metal; and
Group (II): 50% or less of Ni, 50% or less of Ir, 10% or less of Fe, 20% or less of Cr, 15% or less of Mo, 10% or less of Re, 10% or less of Ru, 10% or less of Ti, 20% or less of Nb, 10% or less of Zr, 10% or less of V, 20% or less of Ta, and 10% or less of Hf.
[claim8]
8. A cobalt-base alloy with high heat resistance and high strength produced by the steps of: solution-treating the cobalt-base alloy according to claim 7 in the temperature range of 1100 to 1400 deg. C. for 1 to 2 hours; and
performing aging treatment in the temperature range of 800 to 1000 deg. C. for 1 to 168 hours.
  • 発明者/出願人(英語)
  • ISHIDA KIYOHITO
  • KAINUMA RYOSUKE
  • OIKAWA KATUNARI
  • OHNUMA IKUO
  • SATO JUN
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
参考情報 (研究プロジェクト等) CREST The Innovation of Simulation Technology and the Construction of Foundations for Its Practical Use AREA
ライセンスをご希望の方、特許の内容に興味を持たれた方は、問合せボタンを押してください。

PAGE TOP

close
close
close
close
close
close