Patent US4942562A successfully refreshed from Google Patents.
US4818481A
Expired / Lapsed
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Method of extruding aluminum-base oxide dispersion strengthened
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1987-03-09
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Granted: 1989-04-04
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Expires: 2007-03-09
Abstract
Abstract Disclosed is a method for extruding fine grain aluminum mechanically alloyed powder material such that the resulting extruded product is substantially free of texture, which method comprises extruding a billet of the powder material having a mean grain size less than about 5 microns through a die having an internal contour which conforms substantially to the formula: <IMAGE> where R is the radius of the die contour at any given point x along the major axis of the die orifice from its entry plane, Ro is the radius of the billet, and K is an arbitrary constant.
Inventors
- 👤 Michael J. Luton
- 👤 Raghavan Ayer
- 👤 Ruzica Petkovic-Luton
- 👤 Joseph Vallone
- 👤 Stephen Matras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:06
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/20; C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0036
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
98 words
A method for extruding fine grain aluminum mechanically alloyed powder material into rods such that the resulting extruded product is substantially free of texture, which method comprises extruding a billet of the powder material having a mean grain size less than about 5 microns through a die having an internal contour which conforms substantially to the formula: ##EQU8## where R is the radius of the die contour at any given point x along the major axis of the die orifice from its entry plane, R o is the radius of the billet, and K is an arbitrary constant.
Claim 2
Independent Claim
98 words
A method for extruding fine grain aluminum mechanically alloyed powder material into rods such that the resulting extruded product is substantially free of texture, which method comprises extruding a billet of the powder material having a mean grain size less than about 5 microns through a die having an internal contour which conforms substantially to the formula: ##EQU8## where R is the radius of the die contour at any given point x along the major axis of the die orifice from its entry plane, R o is the radius of the billet, and K is an arbitrary constant.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the alloyed powder also contains aluminum oxy-nitride particles.
Claim 4
Dependent Claim
15 words
The method of claim 2 wherein up to 5 vol. % aluminum oxy-nitrides are present.
Claim 5
Dependent Claim
16 words
The method of claim 3 wherein about 0.01 to 0.5 vol. % aluminum oxy-nitrides are present.
Claim 6
Dependent Claim
34 words
The method of claim 2 wherein a refractory material, as well as the oxy-nitrides, is also present such that the total volume % of oxynitrides and other refractory materials is up to about 25%.
Claim 7
Dependent Claim
21 words
The method of claim 5 wherein the total volume of oxy-nitrides plus other refractory material is from about 0.5 to 10%.
Claim 8
Dependent Claim
24 words
The method of claim 5 wherein the other refractory material is selected from the group consisting of oxides, carbides, nitrides, carbonitrides, and mixtures thereof.
Claim 9
Dependent Claim
15 words
The method of claim 7 wherein the other refractory material is one or more oxides.
Claim 10
Dependent Claim
10 words
The method of claim 8 wherein the oxide is alumina.
Claim 11
Dependent Claim
35 words
The method of claim 5 wherein one or more metals, other than aluminum, is present such that the aluminum content is at least 50 wt. %, based on the total weight of the powder material.
Claim 12
Dependent Claim
18 words
The method of claim 10 wherein the powder material is comprised of at least 80 wt. % aluminum.
Claim 13
Independent Claim
105 words
A method for extruding fine grain aluminum mechanically alloyed powdered material into tubulars such that the resulting extruded product is substantially free of texture, which method comprises extruding a billet of the powder material having a mean grain size less than about 5 microns through a die having an internal contour which conforms substantially to the formula: ##EQU9## where R is the radius of the die contour at any given point x along the major axis of the die orifice from its entry plane; Ro is the outer radius of the billet; Rm is the radius of the mandrel; and K is an arbitrary constant.
Claim 14
Independent Claim
105 words
A method for extruding fine grain aluminum mechanically alloyed powdered material into tubulars such that the resulting extruded product is substantially free of texture, which method comprises extruding a billet of the powder material having a mean grain size less than about 5 microns through a die having an internal contour which conforms substantially to the formula: ##EQU9## where R is the radius of the die contour at any given point x along the major axis of the die orifice from its entry plane; Ro is the outer radius of the billet; Rm is the radius of the mandrel; and K is an arbitrary constant.
References Cited (Backward Citations)
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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) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |