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Functional member from co-based alloy and process for producing the same

Foreign code F110005298
File No. A281-08WO
Posted date Aug 31, 2011
Country United States of America
Application number 09877108
Gazette No. 20110041966
Gazette No. 8021499
Date of filing Apr 7, 2008
Gazette Date Feb 24, 2011
Gazette Date Sep 20, 2011
Priority data
  • P2005-296848 (Oct 11, 2005) JP
  • 2006WO-JP320689 (Oct 11, 2006) WO
Title Functional member from co-based alloy and process for producing the same
Abstract (US8021499)
A Co-based alloy having a fundamental composition of Co—Al system containing 3-15% Al and having lamellar structure wherein f.c.c. structure α-phase and &bgr;(B2)-phase are superimposed on each other in layers, and the Co-based alloy is modified so as to have a porous surface layer region effective for chemical retaining capability, sustained release, biocompatibility, etc. through selective removal of either the α-phase or the &bgr;-phase from the surface layer.
As a third component, at least one member selected from among Ni, Fe, Mn, Ga, Cr, V, Ti, Mo, Nb, Zr, W, Ta, Hf, Si, Rh, Pd, Ir, Pt, Au, B, C and P may be contained in a total amount of 0.001 to 60%.
Scope of claims [claim1]
1. A functional member from a Co-based alloy comprising: a base member of a Co -- Al alloy containing 3 to 15% by mass of Al; and
a lamellar structure wherein the occupancy ratio is 30% by volume or more, a f.c.c. structure alpha -phase and beta (B2)-phase with an interlayer spacing of 100 mu m or less are repeated in layers, and the surface of the base member is modified so as to have a porous surface layer region through selective removal of the alpha -phase or the beta (B2)-phase.
[claim2]
2. The functional member from a Co-based alloy according to claim 1, further comprising a base member of a Co-based alloy having a composition which comprises, on the basis of mass percent, 3 to 15% of Al and further comprises one or more members selected from the following: 0.01 to 50% of Ni, 0.01 to 40% of Fe, 0.01 to 30% of Mn, 0.01 to 40% of Cr, 0.01 to 30% of Mo, 0.01 to 5% of Si, 0.01 to 30% of W, 0.01 to 10% of Zr, 0.01 to 15% of Ta, 0.01 to 10% of Hf, 0.01 to 20% of Ga, 0.01 to 20% of V, 0.01 to 12% of Ti, 0.01 to 20% of Nb, 0.001 to 3% of C, 0.01 to 20% of Rh, 0.01 to 20% of Pd, 0.01 to 20% of Ir, 0.01 to 20% of Pt, 0.01 to 10% of Au, 0.001 to 1% of B, and 0.001 to 1% of P in a total of 0.001 to 60% and with inevitable impurities.
[claim3]
3. The functional member from a Co-based alloy according to claim 1, wherein the porous surface layer region has a depth of 500 nm or more below the surface of the base member and the area of the porous surface layer region is 1.5 times more than that of the surface area before porous formation.
  • Inventor, and Inventor/Applicant
  • ISHIDA KIYOHITO
  • YAMAUCHI KIYOSHI
  • KAINUMA RYOSUKE
  • SUTOU YUJI
  • OMORI TOSHIHIRO
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
Reference ( R and D project ) CREST The Innovation of Simulation Technology and the Construction of Foundations for Its Practical Use AREA
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