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US4719077A
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US
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Method for the preparation of an alloy of nickel and titanium
Assignee: JAPAN AS REPRESENTED BY DIRECTOR GERNERAL OF AGENCY OF INDUSTRIAL SCIENCE AND TECHNOLOGY
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Filing: 1987-06-09
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Granted: 1988-01-12
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Expires: 2007-06-09
Abstract
Abstract An alloy of nickel and titanium in the atomic ratio of 49:51 to 56:44 can be prepared at a temperature much lower than the eutectic point of the corresponding alloy. Thus, a green compact of a powdery mixture of the component metals is subjected to a heat treatment under high vacuum first at a rate of temperature elevation of 5° to 30° C./minute up to a temperature of, for example, 600° C. and then at a rate of temperature elevation of at least 40° C./minute up to a temperature of 815°-900° C. The surface of the metal particles is activated at the first stage along with degassing and the surface-activated metal particles are brought into an exothermic reaction at the second stage to cause explosive fusion and alloying.
Inventors
- 👤 Yoshikazu Suzuki
- 👤 Hidero Unuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:22
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/0433
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
180 words
A method for the preparation of a shaped body of an alloy of nickel and titanium in an alloying ratio in the range from 49:51 to 56:44 by the atomic ratio which comprises the successive steps of: (a) mixing powders of nickel and titanium in an atomic ratio in the range from 49:51 to 56:44 to give a powdery mixture; (b) molding the powdery mixture by compression into a green compact; (c) heating the green compact in an atmosphere of vacuum under a pressure not exceeding 1×10 -5 torr at a rate of temperature elevation in the range from 5° to 30° C. per minute from about 200° C. up to a temperature in the range from 580° to 650° C.; and (d) heating the green compact after the step (c) in an atmosphere of vacuum under a pressure not exceeding 1×10 -5 torr at a rate of temperature elevation of at least 40° C. per minute from a temperature in the range from 580° to 650° C. up to a temperature in the range from 815° to 900° C.
Claim 2
Independent Claim
180 words
A method for the preparation of a shaped body of an alloy of nickel and titanium in an alloying ratio in the range from 49:51 to 56:44 by the atomic ratio which comprises the successive steps of: (a) mixing powders of nickel and titanium in an atomic ratio in the range from 49:51 to 56:44 to give a powdery mixture; (b) molding the powdery mixture by compression into a green compact; (c) heating the green compact in an atmosphere of vacuum under a pressure not exceeding 1×10 -5 torr at a rate of temperature elevation in the range from 5° to 30° C. per minute from about 200° C. up to a temperature in the range from 580° to 650° C.; and (d) heating the green compact after the step (c) in an atmosphere of vacuum under a pressure not exceeding 1×10 -5 torr at a rate of temperature elevation of at least 40° C. per minute from a temperature in the range from 580° to 650° C. up to a temperature in the range from 815° to 900° C.
Claim 3
Dependent Claim
57 words
The method for the preparation of a shaped body of an alloy of nickel and titanium according to claim 1 which further comprises: (e) keeping the green compact after the step (d) at a temperature in the range from 830° to 900° C. for a length of time in the range from 10 minutes to 2 hours.
Claim 4
Dependent Claim
34 words
The method for the preparation of a shaped body of an alloy of nickel and titanium according to claim 1 wherein the powder of nickel has an average particle diameter not exceeding 2.2 μm.
Claim 5
Dependent Claim
34 words
The method for the preparation of a shaped body of an alloy of nickel and titanium according to claim 1 wherein the powder of titanium has an average particle diameter not exceeding 55 μm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-11 | 1991-07-13 | 1992-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-11 | 1995-07-13 | 1996-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-11 | 1999-07-13 | 2000-01-12 | $7700.00 | Window Closed / Lapsed |