Patent US4722826A successfully refreshed from Google Patents.
US4722826A
Expired / Lapsed
US
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Production of water atomized powder metallurgy products
Assignee: Huntington Alloys Corp
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Filing: 1986-09-15
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Granted: 1988-02-02
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Expires: 2006-09-15
Abstract
Abstract A method for utilizing a powder metallurgy ("P/M") slurry by employing water atomized metallic powders and subsequently reducing the oxide levels therein to acceptable levels. The slurry comprises a carbon containing binder. The slurry is consolidated and sintered under controlled conditions to reduce the oxide levels.
Inventors
- 👤 Jon M. Poole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:47
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/06; B22F9/08; B22F3/00; B22F3/001; B22F3/22; C; C22; C22C; C22C30/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
107 words
A P/M method for producing workpieces, the method comprising: (a) water atomizing a metallic alloy system, to form a metallic powder, (b) blending the water atomized metallic powder with water and a water soluble binder having sufficient carbon therein to reduce oxides present in the powder to a predetermined level upon sintering, (c) consolidating the powder/water/binder mixture to a desired workpiece configuration, (d) removing the binder, (e) sintering the workpiece in an inert atmosphere or vacuum at a temperature at or above which the carbon in the binder reduces the oxides in the powder/binder and at a carbon monoxide partial pressure up to and including one atmosphere.
Claim 2
Dependent Claim
107 words
A P/M method for producing workpieces, the method comprising: (a) water atomizing a metallic alloy system, to form a metallic powder, (b) blending the water atomized metallic powder with water and a water soluble binder having sufficient carbon therein to reduce oxides present in the powder to a predetermined level upon sintering, (c) consolidating the powder/water/binder mixture to a desired workpiece configuration, (d) removing the binder, (e) sintering the workpiece in an inert atmosphere or vacuum at a temperature at or above which the carbon in the binder reduces the oxides in the powder/binder and at a carbon monoxide partial pressure up to and including one atmosphere.
Claim 3
Dependent Claim
15 words
The method according to claim 1 wherein the metallic alloy system includes a nickel-base alloy.
Claim 4
Dependent Claim
26 words
The method according to claim 1 wherein the partial pressure of carbon monoxide is reduced to cause oxide reduction of a temperature below the sintering temperature.
Claim 5
Dependent Claim
26 words
The method according to claim 1 wherein when chromium oxide is present in the metallic powder, the sintering step above is conducted above about 1258° C.
Claim 6
Dependent Claim
11 words
The method according to claim 1 wherein the binder includes ethylcellulose.
Claim 7
Dependent Claim
15 words
The method according to claim 1 wherein additional carbon is added to the metallic powder.
Claim 8
Dependent Claim
36 words
The method according to claim 1 wherein the metallic powder includes about 38-46% nickel, about 19.5%-23.5% chromium, about 2.5-3.5% molybdenum, about 1.5-3.0% copper, about 0.6-1.2% titanium, up to about 1.0% manganese, the balance iron and impurities.
Claim 9
Dependent Claim
20 words
The method according to claim 1 wherein the sintering atmosphere is selected from the group consisting of argon and helium.
Claim 10
Dependent Claim
11 words
The method according to claim 1 wherein the workpiece is decarburized.
Claim 11
Dependent Claim
18 words
The method according to claim 9 wherein the workpiece is decarburized in a low dew point hydrogen atmosphere.
Claim 12
Independent Claim
105 words
A method of fabricating nickel-base alloy forms, the method comprising: (a) water atomizing a nickel-base alloy system to form a powder, (b) blending the powder with a water soluble binder and water to form a slurry having sufficient carbon therein to reduce oxides present in the powder to a predetermined level upon sintering, (c) consolidating the slurry into a form, (d) removing the binder, (e) sintering the form in an inert atmosphere or vacuum at a temperature at or above which the carbon in the binder reduces the oxides in the slurry and at a carbon monoxide partial pressure up to and including one atmosphere.
Claim 13
Independent Claim
105 words
A method of fabricating nickel-base alloy forms, the method comprising: (a) water atomizing a nickel-base alloy system to form a powder, (b) blending the powder with a water soluble binder and water to form a slurry having sufficient carbon therein to reduce oxides present in the powder to a predetermined level upon sintering, (c) consolidating the slurry into a form, (d) removing the binder, (e) sintering the form in an inert atmosphere or vacuum at a temperature at or above which the carbon in the binder reduces the oxides in the slurry and at a carbon monoxide partial pressure up to and including one atmosphere.
Claim 14
Dependent Claim
27 words
The method according the claim 11 wherein the partial pressure of the carbon monoxide is reduced to cause oxide reduction at a temperature below the sintering temperature.
Claim 15
Dependent Claim
24 words
The method according to claim 11 wherein when chromium oxide is present in the powder, the sintering step above is conducted above 1232° C.
Claim 16
Dependent Claim
11 words
The method according to claim 11 wherein the binder includes ethylcellulose.
Claim 17
Dependent Claim
14 words
The method according to claim 11 wherein additional carbon is added to the slurry.
Claim 18
Dependent Claim
11 words
The method according to claim 11 wherein the form is decarburized.
Claim 19
Dependent Claim
20 words
The method according to claim 11 wherein the sintering atmosphere is selected from the group consisting of argon and helium.
Claim 20
Dependent Claim
11 words
The method according to claim 11 wherein the form is decarburized.
Claim 21
Dependent Claim
18 words
The method according to claim 18 wherein the form is decarburized in a low dew point hydrogen atmosphere.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |