US4631082A
Expired / Lapsed
US
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Cobalt-chromium superalloy
Assignee: Howmedica Osteonics Corp
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Filing: 1985-02-20
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Granted: 1986-12-23
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Expires: 2005-02-20
Abstract
Abstract An oxide dispersion strengthened cobalt-chromium superalloy produced by mechanical alloying containing a refractory oxide, preferably yttrium oxide, and characterized by excellent corrosion resistance, high fatigue strength and high temperature stability; and prostheses formed from said superalloy.
Inventors
- 👤 Henry L. Andrews
- 👤 Gregory E. Gardiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:44
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0026; A; A61; A61L; A61L27/00; A61L27/02; A61L27/04; A61L27/045; C22C1/00; C22C1/10; C22C1/1084
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
171 words
A high strength, corrosion-resistant, high temperature stable, consolidated, biocompatible, composite alloy produced by mechanical alloying and consisting essentially of the following percentage composition by weight: ______________________________________
chromium 26 to 30
molybdenum 5 to 7
manganese 0 to 1
silicon 0 to 1
iron 0 to 1.5
nickel 0 to 2.5
carbon 0 to 0.35
refractory oxide 0.05 to 1.0
aluminum 0.05 to 0.6
titanium 0.05 to 0.6
______________________________________ and the balance cobalt, apart from trace amounts of incidental impurities; in which the refractory oxide is silica or an oxide of a metal of Group IIA, IIIA, IIIB or IVB of the Periodic Table which forms high temperature-stable, non-accretive, fine particles and is present in the dispersed phase and said alloy after fabrication by mechanical alloying, consolidation and hot rolling, has an ultimate tensile strength of at least 250 k.s.i., a 0.2% offset yield strength of at least 220 k.s.i., an elongation of 2 to 5%, and a fatigue strength at 10 7 cycles (Rotating Cantilever Beam) of at least 100 k.s.i.
Claim 2
Dependent Claim
171 words
A high strength, corrosion-resistant, high temperature stable, consolidated, biocompatible, composite alloy produced by mechanical alloying and consisting essentially of the following percentage composition by weight: ______________________________________
chromium 26 to 30
molybdenum 5 to 7
manganese 0 to 1
silicon 0 to 1
iron 0 to 1.5
nickel 0 to 2.5
carbon 0 to 0.35
refractory oxide 0.05 to 1.0
aluminum 0.05 to 0.6
titanium 0.05 to 0.6
______________________________________ and the balance cobalt, apart from trace amounts of incidental impurities; in which the refractory oxide is silica or an oxide of a metal of Group IIA, IIIA, IIIB or IVB of the Periodic Table which forms high temperature-stable, non-accretive, fine particles and is present in the dispersed phase and said alloy after fabrication by mechanical alloying, consolidation and hot rolling, has an ultimate tensile strength of at least 250 k.s.i., a 0.2% offset yield strength of at least 220 k.s.i., an elongation of 2 to 5%, and a fatigue strength at 10 7 cycles (Rotating Cantilever Beam) of at least 100 k.s.i.
Claim 3
Dependent Claim
19 words
An alloy according to claim 1, in which the refractory oxide is yttrium oxide, Y 2 O 3 .
Claim 4
Dependent Claim
48 words
An alloy according to claim 2, in which the percentage composition by weight is: ______________________________________
chromium 26.20
molybdenum
5.40
manganese
0.78
silicon 0.67
iron 0.18
nickel 0.45
carbon 0.02
yttrium oxide
0.50
aluminum 0.59
titanium 0.30
______________________________________ and the balance cobalt, apart from trace amounts of incidental impurities.
Claim 5
Dependent Claim
48 words
An alloy according to claim 2 in which the percentage composition by weight is: ______________________________________
chromium 26.00
molybdenum
5.20
manganese
0.79
silicon 0.76
iron 0.17
nickel 0.56
carbon 0.03
yttrium oxide
0.54
aluminum 0.27
titanium 0.30
______________________________________ and the balance cobalt, apart from trace amounts of incidental impurities.
Claim 6
Dependent Claim
72 words
An alloy according to claim 2, in which said fabrication comprises the steps of: (1) mechanical alloying by subjecting a mixture of the metallic and oxide ingredients to dry, high-energy milling in a grinding mill and continuing the milling until a uniform distribution of oxide and metallic ingredients is achieved; (2) consolidating the resulting homogeneous composite alloy in powder form by hot extrusion, and (3) hot rolling the resulting extruded solid alloy.
References Cited (Backward Citations)
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