US5498276A
Expired / Lapsed
US
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Iron-based powder compositions containing green strengh enhancing lubricants
Assignee: Hoeganaes Corp
•
Filing: 1994-09-14
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Granted: 1996-03-12
•
Expires: 2014-09-14
Abstract
Abstract Metallurgical powder compositions are provided which contain a metal powder in admixture with a solid, particulate polyether lubricant. The incorporation of the polyether lubricant enhances the green strength properties of compacted parts made from the powder compositions, and generally reduces the ejection forces required to remove the compacted part from the die cavity.
Inventors
- 👤 Sydney Luk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:04
CPC Classifications
B; B22; B22F; B22F1/00; B22F1/10; B22F3/00; B22F3/12; B22F2998/00
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
100 words
An improved metallurgical powder composition, comprising: (a) a major amount of a metal-based powder having a weight average particle size in the range of about 25-350 microns; and (b) a minor amount of a solid compaction lubricant comprising at least about 10 percent by weight of a solid, particulate polyether having the formula: H--[O(CH.sub.2).sub.q ].sub.n --OH where q is from about 1 to about 7, and n is selected such that the polyether has a weight average molecular weight between about 10,000 and about 4,000,000, wherein said polyether has a weight average particle size between about 25 and 150 microns.
Claim 2
Dependent Claim
100 words
An improved metallurgical powder composition, comprising: (a) a major amount of a metal-based powder having a weight average particle size in the range of about 25-350 microns; and (b) a minor amount of a solid compaction lubricant comprising at least about 10 percent by weight of a solid, particulate polyether having the formula: H--[O(CH.sub.2).sub.q ].sub.n --OH where q is from about 1 to about 7, and n is selected such that the polyether has a weight average molecular weight between about 10,000 and about 4,000,000, wherein said polyether has a weight average particle size between about 25 and 150 microns.
Claim 3
Dependent Claim
28 words
The metallurgical powder composition of claim 1 wherein said polyether comprises polyethylene oxide present in an amount of at least 10 percent by weight of said solid lubricant.
Claim 4
Dependent Claim
19 words
The metallurgical powder composition of claim 2 wherein said metal-based powder is an iron-based powder or a nickel-based powder.
Claim 5
Dependent Claim
30 words
The metallurgical powder composition of claim 3 wherein said solid lubricant is present in an amount of from about 0.3 to about 10 percent by weight of said powder composition.
Claim 6
Dependent Claim
26 words
The metallurgical powder composition of claim 4 wherein said polyethylene oxide is present in an amount of at least 30% by weight of said solid lubricant.
Claim 7
Dependent Claim
23 words
The metallurgical powder composition of claim 5 wherein said polyethylene oxide has a weight average molecular weight between about 20,000 and about 3,000,000.
Claim 8
Dependent Claim
23 words
The metallurgical powder composition of claim 5 wherein said polyethylene oxide has a weight average molecular weight between about 20,000 and about 300,000.
Claim 9
Dependent Claim
15 words
The metallurgical powder composition of claim 7 wherein said metal-based powder is an iron-based powder.
Claim 10
Dependent Claim
48 words
The metallurgical powder composition of claim 7 wherein said polyethylene oxide has a particle size distribution such that at least 90% wt. of the polyethylene oxide is above about 10 microns and the weight average particle size of the polethylene oxide is between about 25 and 150 microns.
Claim 11
Dependent Claim
35 words
The metallurgical powder composition of claim 9 wherein the polyethylene oxide has a particle size distribution such that at least 90% by weight of the polyethylene oxide has a particle size below about 150 microns.
Claim 12
Dependent Claim
48 words
The metallurgical powder composition of claim 5 wherein said polyethylene oxide has a particle size distribution such that at least 90% wt. of the polyethylene oxide is above about 10 microns and the weight average particle size of the polyethylene oxide is between about 25 and 150 microns.
Claim 13
Dependent Claim
35 words
The metallurgical powder composition of claim 11 wherein the polyethylene oxide has a particle size distribution such that at least 90% by weight of the polyethylene oxide has a particle size below about 150 microns.
Claim 14
Dependent Claim
21 words
The metallurgical powder composition of claim 4 wherein said polyethylene oxide constitutes at least 50% by weight of said solid lubricant.
Claim 15
Dependent Claim
24 words
The metallurgical powder composition of claim 13 wherein said polyethylene oxide has a weight average molecular weight of between about 20,000 and about 300,000.
Claim 16
Dependent Claim
65 words
The metallurgical powder composition of claim 14 wherein said polyethylene oxide has a particle size distribution such that at least 90% wt. of the polyethylene oxide is above about 10 microns, at least 90% by weight of the polyethylene oxide has a particle size below about 150 microns, and the weight average particle size of the polyethylene oxide is between about 25 and 150 microns.
Claim 17
Dependent Claim
24 words
The metallurgical powder composition of claim 13 wherein said polyethylene oxide has a weight average molecular weight of between about 20,000 and about 100,000.
Claim 18
Dependent Claim
15 words
The metallurgical powder composition of claim 16 wherein said metal-based powder is an iron-based powder.
Claim 19
Dependent Claim
32 words
The metallurgical powder composition of claim 17 wherein said polyethylene oxide constitutes at least 90% by weight of the solid lubricant and has a weight average particle size of about 25-150 microns.
Claim 20
Dependent Claim
16 words
The metallurgical powder composition of claim 18 further comprising a minor amount of an alloying powder.
Claim 21
Dependent Claim
92 words
An improved metallurgical powder composition, comprising: (a) a major amount of an iron-based powder having a weight average particle size in the range of about 25-150 microns; and (b) from about 0.05 to about 5 weight percent of a solid, particulate polyether having the formula: H--[O(CH.sub.2).sub.q ].sub.n --OH where q is from about 1 to about 7, and n is selected such that the polyether has a weight average molecular weight between about 10,000 and about 4,000,000, wherein said polyether has a weight average particle size between about 25 and 150 microns.
Claim 22
Dependent Claim
92 words
An improved metallurgical powder composition, comprising: (a) a major amount of an iron-based powder having a weight average particle size in the range of about 25-150 microns; and (b) from about 0.05 to about 5 weight percent of a solid, particulate polyether having the formula: H--[O(CH.sub.2).sub.q ].sub.n --OH where q is from about 1 to about 7, and n is selected such that the polyether has a weight average molecular weight between about 10,000 and about 4,000,000, wherein said polyether has a weight average particle size between about 25 and 150 microns.
Claim 23
Dependent Claim
26 words
The metallurgical powder composition of claim 20 wherein said polyether is polyethylene oxide having a weight average molecular weight of from about 10,000 to about 300,000.
Claim 24
Dependent Claim
30 words
The metallurgical powder composition of claim 21 wherein said polyethylene oxide has a particle size such that at least 90% wt. of the polyethylene oxide is above about 10 microns.
Claim 25
Dependent Claim
24 words
The metallurgical powder composition of claim 22 wherein the weight average particle size of the polyethylene oxide is between about 50 and 150 microns.
Claim 26
Dependent Claim
35 words
The metallurgical powder composition of claim 23 wherein the polyethylene oxide has a particle size distribution such that at least 90% by weight of the polyethylene oxide has a particle size below about 150 microns.
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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) | 1999-03-12 | 1999-09-11 | 2000-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-12 | 2003-09-11 | 2004-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-12 | 2007-09-11 | 2008-03-12 | $7700.00 | Window Closed / Lapsed |