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US5154881A
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Method of making a sintered metal component
Assignee: Hoeganaes Corp A Corporation Of De
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Filing: 1992-02-14
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Granted: 1992-10-13
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Expires: 2012-02-14
Abstract
Abstract Methods of making sintered parts from a metal powder composition that contains an amide lubricant are provided. The composition comprises an iron-based powder and a lubricant that is the reaction product of a monocarboxylic acid, a dicarboxylic acid, and a diamine. The composition is compacted in a die, preferably at an elevated temperature of up to about 370° C., at conventional compaction pressures, and then sintered according to standard powder-metallurgical techniques.
Inventors
- 👤 Howard G. Rutz
- 👤 Sidney Luk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:13
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264; B; B22; B22F; B22F1/00; B22F1/10; B22F1/103; B22F1/108; B22F3/00; B22F3/02; B22F2003/023; B22F3/12; B22F3/14; B22F2003/145; B22F2998/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
118 words
A method of making a sintered metal part comprising the steps of: (a) providing a metal powder composition comprising: (i) an iron-based metal powder and (ii) an amide lubricant, in an amount up to about 15% by weight of said composition, that is the reaction product of about 10-30 weight percent of a C 6 -C 12 linear dicarboxylic acid, about 10-30 weight percent of a C 10 -C 22 monocarboxylic acid, and about 40-80 weight percent of a diamine having the formula (CH 2 ) x (NH 2 ) 2 where x is 2-6; (b) compacting the metal powder composition in a die at a temperature up to about 370° C.; and (c) sintering the compacted composition.
Claim 2
Independent Claim
118 words
A method of making a sintered metal part comprising the steps of: (a) providing a metal powder composition comprising: (i) an iron-based metal powder and (ii) an amide lubricant, in an amount up to about 15% by weight of said composition, that is the reaction product of about 10-30 weight percent of a C 6 -C 12 linear dicarboxylic acid, about 10-30 weight percent of a C 10 -C 22 monocarboxylic acid, and about 40-80 weight percent of a diamine having the formula (CH 2 ) x (NH 2 ) 2 where x is 2-6; (b) compacting the metal powder composition in a die at a temperature up to about 370° C.; and (c) sintering the compacted composition.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein said compaction step is conducted at a temperature of at least about 150° C.
Claim 4
Independent Claim
11 words
The method of claim wherein the monocarboxylic acid is stearic acid.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein the dicarboxylic acid is sebacic acid.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein the diamine is ethylene diamine.
Claim 7
Dependent Claim
44 words
The method of claim 2 wherein the monocarboxylic acid is stearic acid, the dicarboxylic acid is sebacic acid and the diamine is ethylene diamine; and wherein the amide lubricant has a melting range that begins at a temperature of at least about 150° C.
Claim 8
Dependent Claim
38 words
The method of claim 2 wherein the iron based powder comprises at least one alloying element selected from the group consisting of molybdenum, manganese, magnesium, chromium, silicon, copper, nickel, gold, chromium, vanadium, columbium, carbon, graphite, phosphorus, and aluminum.
Claim 9
Dependent Claim
12 words
The method of claim 7 wherein the iron-based powder comprises pre-alloyed iron.
Claim 10
Dependent Claim
33 words
The method of claim 8 wherein the pre-alloyed iron based powder is an atomized powder of iron containing dissolved molybdenum in an amount of from about 0.5-2.5 weight percent as an alloying element.
Claim 11
Dependent Claim
65 words
The method of claim 8 wherein the iron-based powder is an admixture of two powders of pre-alloyed iron, the first powder containing about 0.5 to about 3 weight percent molybdenum and the second powder containing at least 0.15 weight percent carbon and at least about 25 weight percent of a transition element selected from the group consisting of chromium, manganese, vanadium, columbium, and combinations thereof.
Claim 12
Dependent Claim
35 words
The method of claim 8 wherein the pre-alloyed iron-based powder comprises iron that has been pre-alloyed with about 0.5-0.6 weight percent molybdenum, from about 1.5-2.0 weight percent nickel, and from about 0.1-0.25 weight percent manganese.
Claim 13
Dependent Claim
21 words
The method of claim 2 wherein the lubricant is present in an amount of from 0.1 to about 1 weight percent.
Claim 14
Dependent Claim
24 words
The method of claim 12 wherein said compacting step is performed at a pressure of about 25 to about 55 tons per square inch.
Claim 15
Dependent Claim
17 words
The method of claim 2 wherein the amide lubricant comprises at least 65 percent by weight diamides.
References Cited (Backward Citations)
US4106932A
Cited
US4002474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-13 | 1996-04-13 | 1996-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-13 | 2000-04-13 | 2000-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-13 | 2004-04-13 | 2004-10-13 | $7700.00 | Window Closed / Lapsed |