US3895942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strong, high purity nickel
Assignee: Huntington Alloys Corp
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Filing: 1973-03-16
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Granted: 1975-07-22
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Expires: 1993-03-16
Abstract
Abstract A nickel powder metallurgy product containing very small amounts of carbon, oxygen, magnesium, and aluminum is characterized by very high strength and fine grain.
Inventors
- 👤 Jeremy Painter Morse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:53
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0026; C22C1/00; C22C1/10; C22C1/1078
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
157 words
A METHOD OF PRODUCING A DISPERSION-STRENGTHENED NICKEL ALLOY POWDER METALLURGY PRODUCT COMPRISING: A. PROVIDING A BLENDED POWDER CHARGE CONSISTING ESSENTIALLY OF, BY WEIGHT, UP TO ABOUT 0.2 PERCENT CARBON, ABOUT 0.07 TO ABOUT 0.1 PERCENT MAGNESIUM, A METAL OXIDE AS A SOURCE OF OXYGEN, SAID METAL OXIDE BEING PRESENT IN SUFFICIENT AMOUNT TO OXIDIZE AT LEAST 10 PERCENT OF THE MAGNESIUM TO MAGNESIA, SAID METAL OXIDE BEING STABLE AT THE TEMPERATURE AT WHICH THE MAGNESIUM VAPORIZES, AND SAID METAL OXIDE HAVING A FREE ENERGY OF FORMATION LESS THAN THAT OF THE MAGNESIA, AND THE BALANCE FINE NICKEL POWDER, B. SINTERING THE POWDER MIXTURE IN A REDUCING ATMOSPHERE AT A TEMPERATURE AT LEAST IN EXCESS OF THE BOILING POINT OF MAGNESIUM IN SAID CHARGE TO CONVERT METAL IN SAID METAL OXIDE TO THE ELEMENTAL STATE AND MAGNESIUM TO MAGNESIA AND TO FORM A SINTERED BILLET, AND C. THEREAFTER HOT WORKING THE SINTERED BILLET TO PROVIDE A DISPERSION-STRENGTHENED PRODUCT.
Claim 2
Independent Claim
157 words
A METHOD OF PRODUCING A DISPERSION-STRENGTHENED NICKEL ALLOY POWDER METALLURGY PRODUCT COMPRISING: A. PROVIDING A BLENDED POWDER CHARGE CONSISTING ESSENTIALLY OF, BY WEIGHT, UP TO ABOUT 0.2 PERCENT CARBON, ABOUT 0.07 TO ABOUT 0.1 PERCENT MAGNESIUM, A METAL OXIDE AS A SOURCE OF OXYGEN, SAID METAL OXIDE BEING PRESENT IN SUFFICIENT AMOUNT TO OXIDIZE AT LEAST 10 PERCENT OF THE MAGNESIUM TO MAGNESIA, SAID METAL OXIDE BEING STABLE AT THE TEMPERATURE AT WHICH THE MAGNESIUM VAPORIZES, AND SAID METAL OXIDE HAVING A FREE ENERGY OF FORMATION LESS THAN THAT OF THE MAGNESIA, AND THE BALANCE FINE NICKEL POWDER, B. SINTERING THE POWDER MIXTURE IN A REDUCING ATMOSPHERE AT A TEMPERATURE AT LEAST IN EXCESS OF THE BOILING POINT OF MAGNESIUM IN SAID CHARGE TO CONVERT METAL IN SAID METAL OXIDE TO THE ELEMENTAL STATE AND MAGNESIUM TO MAGNESIA AND TO FORM A SINTERED BILLET, AND C. THEREAFTER HOT WORKING THE SINTERED BILLET TO PROVIDE A DISPERSION-STRENGTHENED PRODUCT.
Claim 3
Independent Claim
105 words
A method of producing a dispersion-strengthened nickel alloy powder metallurgy product comprising: a. providing a blended powder charge consisting essentially of, by weight, up to about 0.2 percent carbon, about 0.01 to about 0.06 percent aluminum oxide, about 0.07 to about 0.1 percent of magnesium, and the balance fine nickel powder; b. sintering the powder mixture in a reducing atmosphere at a temperature at least in excess of the boiling point of magnesium in said charge to convert aluminum oxide to aluminum and magnesium to magnesia and to form a sintered billet; and c. thereafter hot working the sintered billet to provide a dispersion-strengthened product.
Claim 4
Independent Claim
105 words
A method of producing a dispersion-strengthened nickel alloy powder metallurgy product comprising: a. providing a blended powder charge consisting essentially of, by weight, up to about 0.2 percent carbon, about 0.01 to about 0.06 percent aluminum oxide, about 0.07 to about 0.1 percent of magnesium, and the balance fine nickel powder; b. sintering the powder mixture in a reducing atmosphere at a temperature at least in excess of the boiling point of magnesium in said charge to convert aluminum oxide to aluminum and magnesium to magnesia and to form a sintered billet; and c. thereafter hot working the sintered billet to provide a dispersion-strengthened product.
Claim 5
Dependent Claim
20 words
A method according to claim 2, wherein the powder mixture is sintered at a temperature of at least about 1175*C.
Claim 6
Dependent Claim
31 words
A method according to claim 2, wherein said powder mixture is compacted prior to sintering to provide in the compact a green density of about 5.8 gram per centimeter or more.
Claim 7
Dependent Claim
15 words
A method according to claim 2, wherein said sintering is conducted in a hydrogen atmosphere.
Claim 8
Dependent Claim
21 words
A method according to claim 2, wherein said nickel powder has an average particle size of about 7 microns or less.
Claim 9
Dependent Claim
17 words
A method according to claim 6 wherein the fine nickel powder is a highly pure carbonyl nickel.
Claim 10
Dependent Claim
19 words
A method according to claim 2 wherein the magnesium is elemental magnesium in the form of a fine powder.
Claim 11
Dependent Claim
19 words
A method according to claim 2, wherein said alumina powder has a particle size not exceeding about 0.10 microns.
Claim 12
Dependent Claim
32 words
A method according to claim 2, wherein said powder charge consists essentially of, by weight, about 0.07 to 0.1 percent magnesium, about 0.01 to 0.06 percent aluminum oxide, and the balance nickel.
Claim 13
Dependent Claim
38 words
A method according to claim 2, wherein said powder charge consists essentially of, by weight, about 0.10 to 0.20 percent carbon, about 0.07 to 0.1 percent magnesium, about 0.01 to 0.06 percent aluminum oxide, and the balance nickel.
Claim 14
Dependent Claim
69 words
A method according to claim 2, wherein said magnesium in the powder charge is present in an amount at least sufficient, stoichiometrically, to reduce all of said alumina present to metallic aluminum, whereby during said sintering step at least about 90 percent of the aluminum oxide is reduced to aluminum, magnesium is converted to magnesia, and about 40 to 70 percent of the magnesium is retained in metallic form.
Claim 15
Independent Claim
153 words
A method of producing a dispersion-strengthened nickel alloy powder metallurgy product comprising: a. providing a blended powder charge consisting essentially of, by weight, up to about 0.2 percent carbon, about 0.07 percent to about 0.1 percent magnesium; a metal oxide as a source of oxygen, said metal oxide being a member of the group consisting of an oxide of Al, Ti, Ni, Co, Fe, Cu, Mn, and W, and said metal oxide being present in sufficient amount to oxidize at least 10 percent of the magnesium to magnesia; and the balance fine nickel powder; b. sintering the powder mixture in a reducing atmosphere at a temperature at least in excess of the boiling point of magnesium in said charge to convert metal in said metal oxide to the elemental state and magnesium to magnesia and to form a sintered billet; and c. thereafter hot working the sintered billet to provide a dispersion-strengthened product.
Claim 16
Independent Claim
153 words
A method of producing a dispersion-strengthened nickel alloy powder metallurgy product comprising: a. providing a blended powder charge consisting essentially of, by weight, up to about 0.2 percent carbon, about 0.07 percent to about 0.1 percent magnesium; a metal oxide as a source of oxygen, said metal oxide being a member of the group consisting of an oxide of Al, Ti, Ni, Co, Fe, Cu, Mn, and W, and said metal oxide being present in sufficient amount to oxidize at least 10 percent of the magnesium to magnesia; and the balance fine nickel powder; b. sintering the powder mixture in a reducing atmosphere at a temperature at least in excess of the boiling point of magnesium in said charge to convert metal in said metal oxide to the elemental state and magnesium to magnesia and to form a sintered billet; and c. thereafter hot working the sintered billet to provide a dispersion-strengthened product.
Claim 17
Dependent Claim
14 words
A method according to claim 2, wherein the dispersion-strengthened nickel alloy produced is weldable.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |