Claims
- 1. A powder composition for warm compaction comprising an iron-based powder and a lubricant powder, said lubricant consisting essentially of an amide represented by the following formula:D—Cma—B—A—Cmb—D, whereinD is —H, COR, CNHR, wherein R is a straight or branched aliphatic or aromatic group including 2-21 C atoms, C is the group —NH (CH)n CO—, B is amino or carbonyl, A is alkylene having 4-16 C atoms optionally including up to 4 O atoms, ma is an integer 1-10, mb is an integer 1-10, and n is an integer 5-11.
- 2. A powder composition according to claim 1, wherein D is COR, wherein R is an aliphatic group 16-20 C atoms, C is —NH (CH)n CO— wherein n is 5 or 11; B is amino; A is alkylene having 6-14 C atoms optionally including up to 3 O atoms, and ma and mb, respectively is an integer 2-5, whereby ma and mb may be the same or different.
- 3. A powder composition according to claim 1, wherein the lubricant consists of a compound selected from the group consisting of:CH3(CH2)16CO—[HN(CH2)11CO]2—HN(CH2)12NH—[OC(CH2)11NH]2—OC(CH2)16CH3, CH3(CH2)16CO—[HN(CH2)11CO]2—HN(CH2)12NH—[OC(CH2)11NH]3—OC(CH2)16CH3, CH3(CH2)16CO—[HN(CH2)11CO]3—HN(CH2)12NH—[OC(CH3)11NH]3—OC(CH2)16CH3, CH3(CH2)16CO—[HN(CH2)11CO]2—HN(CH2)12NH—[OC(CH2)11NH]4—OC(CH2)16CH3, CH3(CH2)16CO—[HN(CH2)11CO]4—HN(CH2)12NH—[OC(CH2)11NH]4—OC(CH2)16CH3, CH3(CH2)16CO—[HN(CH2)11CO]4—HN(CH2)12NH—[OC(CH2)11NH]5—OC(CH2)16CH3, CH3(CH2)16CO—[HN(CH2)11CO]5—HN(CH2)12NH—[OC(CH2)11NH]5—OC(CH2)16CH3.
- 4. A powder composition according to claim 1, wherein said amide has a molecular weight of 1500 to 3000 and is present in said composition in an amount of less than 1% by weight.
- 5. A powder composition according to claim 1, wherein the lubricant powder is provided in a concentration 0.2 to 0.8% by weight of the composition.
- 6. A powder composition according to claim 1, which additionally contains one or more additives selected from the group consisting of binders, processing aids, and hard phases.
- 7. A powder composition according to claim 1, wherein said iron-based powder is compressible, and at least 80% by weight of said lubricant powder is made up of said amide.
- 8. A powder composition according to claim 1, wherein said composition is essentially free from ethylenebisstearamide.
- 9. A powder composition according to claim 1, wherein said iron-based powder has a carbon content of at most 0.04% by weight.
- 10. A method for producing sintered products comprising:(a) mixing an iron-based powder with a lubricant powder as defined in claim 1; (b) preheating the metal-powder composition, (c) compacting the metal-powder composition in a preheated tool, and (d) sintering the compacted metal-powder composition to form a sintered product.
- 11. A powder composition according to claim 2, wherein the lubricant consists of a compound selected from the group consisting of:CH3(CH2)16CO—[HN(CH2)11CO]2—HN(CH2)12NH—[OC(CH2)11NH]2—OC(CH2)16CH3, CH3(CH2)16CO—[HN(CH2)11CO]2—HN(CH2)12NH—[OC(CH2)11NH]3—OC(CH2)16CH3, CH3(CH2)16CO—[HN(CH2)11CO]2—HN(CH2)12NH—[OC(CH2)11NH]3—OC(CH2)16CH3, CH3(CH2)16CO—[HN(CH2)11CO]2—HN(CH2)12NH—[OC(CH2)11NH]4—OC(CH2)16CH3, CH3(CH2)16CO—[HN(CH2)11CO]4—HN(CH2)12NH—[OC(CH2)11NH]4—OC(CH2)16CH3, CH3(CH2)16CO—[HN(CH2)11CO]4—HN(CH2)12NH—[OC(CH2)11NH]5—OC(CH2)16CH3, CH3(CH2)16CO—[HN(CH2)11CO]5—HN(CH2)12NH—[OC(CH2)11NH]5—OC(CH2)16CH3.
- 12. A powder composition according to claim 2, wherein said amide has a molecular weight of 1500 to 3000 and is present in said composition in an amount of less than 1% by weight.
- 13. A powder composition according to claim 3, wherein said amide has a molecular weight of 1500 to 3000 and is present in said composition in an amount of less than 1% by weight.
- 14. A powder composition according to claim 11, wherein said amide has a molecular weight of 1500 to 3000 and is present in said composition in an amount of less than 1% by weight.
- 15. A powder composition according to claim 2, wherein the lubricant powder is provided in a concentration 0.2 to 0.8% by weight of the composition.
- 16. A powder composition according to claim 2, which additionally contains one or more additives selected from the group consisting of binders, processing aids, and hard phases.
- 17. A powder composition according to claim 2, wherein said iron-based powder is compressible, and at least 80% by weight of said lubricant powder is made up of said amide.
- 18. A powder composition according to claim 2, wherein said composition is essentially free from ethylenebisstearamide.
- 19. A powder composition according to claim 2, wherein said iron-based powder has a carbon content of at most 0.04% by weight.
- 20. A method for producing sintered products in accordance with claim 10 wherein said sintering of (d) is carried out at a temperature above 1050° C.
Priority Claims (1)
Number |
Date |
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Kind |
0101344 |
Apr 2001 |
SE |
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Parent Case Info
This is a continuation-in-part of U.S. patent application Ser. No. 09/852,024, filed May 10, 2001 now abandoned; is a continuation of International Application No. PCT/SE02/00762 that designates the United States of America which was filed on Apr. 17, 2002 and was published in English on Oct. 24, 2002; and claims priority for Swedish Application No. 0101344-0, filed on Apr. 17, 2001.
US Referenced Citations (9)
Foreign Referenced Citations (1)
Number |
Date |
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4136104 |
May 1992 |
JP |
Continuations (1)
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Number |
Date |
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PCT/SE02/00762 |
Apr 2002 |
US |
Child |
09/852024 |
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US |
Continuation in Parts (1)
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09/852024 |
May 2001 |
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Child |
10/201974 |
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US |