Patent US4952236A successfully refreshed from Google Patents.
US4952236A
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US
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Method of making high strength, low modulus, ductile, biocompatible titanium alloy
Assignee: Howmedica Osteonics Corp
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Filing: 1989-05-25
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Granted: 1990-08-28
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Expires: 2009-05-25
Abstract
Abstract Method for preparing a high strength, low modulus, ductile, biocompatible titanium base alloy containing one or more isomorphous beta stabilizers, eutectoid beta stabilizers and optional alpha stabilizers, characterized by a modulus of elasticity not exceeding 100 GPa; comprising blending pre-selected amounts of the alloying ingredients, melting the blend in a plasma arc furnace, allowing the melt to cool and solidify, vaccum arc remelting and thermomechanically processing the resulting solid to provide the desired alloy.
Inventors
- 👤 Kathy K. Wang
- 👤 Larry J. Gustavson
- 👤 John H. Dumbleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:55
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/02; A61L27/04; A61L27/06; C; C22; C22C; C22C14/00; A61F; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
171 words
A method for preparing a high strength, low modulus, ductile titanium base alloy which comprises mechanically blending particles of the following alloying components: up to 24% by weight of at least one isomorphous beta stabilizer selected from the group consisting of molybdenum, tantalum, niobium and zirconium; up to 3.0% by weight of at least one eutectoid beta stabilizer selected from the group consisting of iron, manganese, chromium, cobalt and nickel; optionally up to 3.0% by weight of at least one metallic alpha stabilizer selected from the group consisting of aluminum and lanthanum; and the balance titanium; introducing the resulting blended feedstock into a plasma arc furnace wherein the blend is melted to form a homogenous melt, allowing the melt to cool and solidify, vacuum arc remelting the resulting solid to assure that the hydrogen content does not exceed 0.02% by weight and thermomechanically processing the resulting solid at a temperature within the range of 710° to 1038° C. to provide an alloy having a modulus of elasticity not exceeding 100 GPa.
Claim 2
Independent Claim
171 words
A method for preparing a high strength, low modulus, ductile titanium base alloy which comprises mechanically blending particles of the following alloying components: up to 24% by weight of at least one isomorphous beta stabilizer selected from the group consisting of molybdenum, tantalum, niobium and zirconium; up to 3.0% by weight of at least one eutectoid beta stabilizer selected from the group consisting of iron, manganese, chromium, cobalt and nickel; optionally up to 3.0% by weight of at least one metallic alpha stabilizer selected from the group consisting of aluminum and lanthanum; and the balance titanium; introducing the resulting blended feedstock into a plasma arc furnace wherein the blend is melted to form a homogenous melt, allowing the melt to cool and solidify, vacuum arc remelting the resulting solid to assure that the hydrogen content does not exceed 0.02% by weight and thermomechanically processing the resulting solid at a temperature within the range of 710° to 1038° C. to provide an alloy having a modulus of elasticity not exceeding 100 GPa.
Claim 3
Dependent Claim
69 words
A method according to claim 1, in which the resulting alloy has a modulus of elasticity of 66.9 to 100 GPa; a 0.2% offset yield strength of 925 to 1221 MPa: a rotating beam fatigue strength of 483 to 621 MPa at 10 7 cycles and of 345 to 380 MPa at a stress concentration factor, k t , of 1.6; and a tensile elongation of at least 10%.
Claim 4
Dependent Claim
43 words
A method according to claim 1, in which the metal ingredients of the feedstock comprise 10 to 13% by weight molybdenum; 5 to 7% by weight zirconium; 0.2 to 3.0% by weight iron; 0 to 3.0% by weight aluminum; and the balance titanium.
Claim 5
Dependent Claim
44 words
A method according to claim 2, in which the metal ingredients of the feedstock comprise about 11.5% by weight molybdenum, about 6.0% by weight zirconium, about 0.4 to about 2.0% by weight iron, 0 to about 1.0% by weight aluminum and the balance titanium.
Claim 6
Dependent Claim
42 words
A method according to claim 1, in which the metal ingredients of the feedstock comprise 10.0 to 20.0% by weight niobium; 1.0 to 4.0% by weight zirconium; about 2.0% by weight iron: up to 1.0% by weight aluminum; and the balance titanium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |