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WO2002083346A1 - Iron powder composition including an amide type lubricant and a method to prepare it - Google Patents

Iron powder composition including an amide type lubricant and a method to prepare it Download PDF

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Publication number
WO2002083346A1
WO2002083346A1 PCT/SE2002/000763 SE0200763W WO02083346A1 WO 2002083346 A1 WO2002083346 A1 WO 2002083346A1 SE 0200763 W SE0200763 W SE 0200763W WO 02083346 A1 WO02083346 A1 WO 02083346A1
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WO
WIPO (PCT)
Prior art keywords
lubricant
fatty acid
composition according
atoms
iron
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE2002/000763
Other languages
French (fr)
Inventor
Björn Johansson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoganas AB
Original Assignee
Hoganas AB
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Filing date
Publication date
Application filed by Hoganas AB filed Critical Hoganas AB
Priority to DE60205610T priority Critical patent/DE60205610T2/en
Priority to AT02724846T priority patent/ATE302081T1/en
Priority to EP02724846A priority patent/EP1387730B1/en
Priority to JP2002581133A priority patent/JP4126230B2/en
Priority to US10/201,954 priority patent/US6872235B2/en
Publication of WO2002083346A1 publication Critical patent/WO2002083346A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/56—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing nitrogen
    • C10M105/68—Amides; Imides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B22F1/108—Mixtures obtained by warm mixing
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • C10M171/06—Particles of special shape or size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F2003/023—Lubricant mixed with the metal powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Definitions

  • the present invention relates to metal powder compositions and a method of preparing such compositions.
  • the invention relates to iron-based composi- tions having consistent apparent density and flowability at different temperatures.
  • the powder metallurgy art generally uses different standard temperature regimes for the compaction of a metal powder to form a metal component . These include chill-pressing (pressing below ambient temperatures) , cold-pressing (pressing at ambient temperatures) , hot- pressing (pressing at temperatures above those at which the metal powder is capable of retaining work-hardening) , and warm-pressing (pressing at temperatures between cold- pressing and hot-pressing) .
  • the US patents 5,744, 433 (Storstrom et al) and 5,154,881 (Rutz) disclose metal powder compositions including amide lubricants which are especially developed for warm compaction.
  • the US patent 5,744, 433 discloses a lubricant for metallurgical powder compositions contains an oligomer of amide type, which has a weight-average molecular weight M w of 30,000 at the most.
  • the amide lubricant consists of the re- action product of a monocarboxylic acid, a dicarboxylic acid and a diamine.
  • ADVAWAX.®. 450 which is an ethylenebisstearamide product .
  • An object of the present invention is to reduce or eliminate current problems associated with large scale production. Another object is to provide a new type of lubricant useful in metal compositions intended for compaction at elevated temperatures . Still another problem is to provide an iron-based powder composition distinguished by excellent flow rate and apparent density.
  • a further object is to provide a powder composition, which generates a minimum of dust and the preparation of which does not require the use of organic solvents.
  • Another object is to provide a method for warm compaction such a metal powder composition.
  • a powder composition comprising an iron-based powder, at least one oligomer amide type lubricant, at least one fatty acid and optionally one or more additives such as flow agents, process- ing aids and hard phases.
  • the method according to the invention includes the steps of
  • iron-based powder encompasses powder essentially made up of pure iron; iron powder that has been prealloyed with other substances improving the strength, the hardening properties, the electromagnetic properties or other desirable properties of the end products; and particles of iron mixed with particles of such alloying elements (diffusion annealed mixture or purely mechanical mixture).
  • alloying elements are nickel, copper, molybdenum, chromium, manganese, phosphorus, carbon in the form of graphite, and tungsten, which are used either separately or in combination, e.g. in the form of compounds (Fe 3 P and FeMo) .
  • the lubricants according to the invention are used in combination with iron-based powders having high compressability.
  • such powders have a low carbon content, preferably below 0.04% by weight.
  • Such powders include e.g. Distaloy AE, Astaloy Mo and ASC 100.29, all of which are commercially available from Hoganas AB, Sweden.
  • the lubricant used according to the present invention is new and may be represented by the following formula :
  • D 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 C0-
  • A is alkylen having 4-16 C atoms optionally including up to 4 0 atoms ma is an integer 1-10 mb is an integer 1-10 n is an integer 5-11.
  • the lubricant has the chemical structure 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 alkylen having 6-14 C atoms optionally including up to 3 0 atoms, and ma and mb, which may be the same or different is an integer 2-5.
  • Examples of such lubricants may be selected from the group consisting of
  • the oligomer amide type lubricant which is added to the iron-based powder is preferably in the form of a solid powder, can make up 0.1-1% by weight of the metal- powder composition, preferably 0.2-0.8% by weight, based on the total amount of the metal -powder composition.
  • the possibility of using the lubricant according to the present invention in low amounts is an especially advanta- geous feature of the invention, since it enables high densities to be achieved
  • the fatty acid used according to the present inventions is preferably a fatty acid having 10-22 C atoms.
  • examples of such acids are oleic acid, stearic acid and palmitic acid.
  • the amount of the fatty acid is normally 0.005-0.15, preferably 0.010-0.08 and most preferably 0.015-0.07 % calculated on the total weight of the powder composition. Fatty acid contents below 0.005 make it difficult to achieve an even distribution of the fatty acid. If the content is higher than 0.15 there is a considerable risk that the flow will deteriorate.
  • the melting point of the fatty acid should be lower than that of the amide oligomer lubricant.
  • the new powder composition may contain one or more addi- tives selected from the group consisting of processing aids and hard phases .
  • the processing aids used in the metal -powder composition may consist of talc, forsterite, manganese sul- phide, sulphur, molybdenum disulphide, boron nitride, tellurium, selenium, barium difluoride and calcium di- fluoride, which are used either separately or in combination.
  • the hard phases used in the metal -powder composition may consist of carbides of tungsten, vanadium, titanium, niobium, chromium, molybdenum, tantalum and zirconium, nitrides of aluminium, titanium, vanadium, molybdenum and chromium, Al 2 0 3 , and various ceramic materials.
  • the flow agent which is preferably a silicon dioxide, is used in an amount from about 0.005 to about 2 percent by weight, preferably from about 0.01 to about 1 percent by weight, and more preferably from about 0.025 to about 0.5 percent by weight, based on the total weight of the metallurgical composition. Furthermore, the flow agent should have an average particle size below about 40 nanometers.
  • Preferred silicon oxides are the silicon dioxide materials, both hydrophilic and hydrophobic forms, commercially available as the Aerosil line of silicon dioxides, such as the Aerosil 200 and R812 products, from Degussa Corporation.
  • the iron-based powder, at least one oligomer amide type lubricant, at least one fatty acid and optionally one or more additives, such as processing aids and hard phases, are heated to a temperature above the melting point of the lubricant; the obtained mixture is subsequently cooled to a temperature below the melting point of the lubricant and above the melting point of the fatty acid ; and a pulverulent flow agent is added to the obtained mixture, which is then mixed and cooled.
  • FIG. 1 shows the effect of the combination of the oligomer amide type lubricant defined above and a fatty acid (stearic acid) on the apparent density.
  • FIG. 2 shows the effect of the combination of the lubricant defined above and a fatty acid (stearic acid) on the flow rate.
  • the powder mixture tested was prepared by dry mixing Distaloy AE (an iron-based powder available from H ⁇ ganas AB, Sweden) with 0.6 % by weight of organic material which consisted of the oligomer amide type lubricant defined above and 0.03 or 0.05 % by weight of stearic acid. 0.3 % by weight of graphite was aslo added and the ob- tained mixture was heated to 165 °C. The mixture was cooled to 110 °C and 0.06 % by weight of Aerosil® was added at this temperature. Essentially the same results are obtained when the Aerosil is added at ambient temperature . The results disclosed in FIG.l and 2 respectively demonstrate that clear and unexpected effects on both apparent density and flow can be obtained with the powder compositions according to the present invention.
  • the above mixture which included 0.03% by weight of stearic acid was also tested with regard to the dust reduction in comparison with a mixture prepared according to the US patent 5 368 630.
  • the known mixture also included 0.6% by weight of organic material but in this case the organic material consisted of 0.55% by weight of lubricant and 0.15% by weight of an organic binder (cellulose butyrate) .
  • the iron-based powder was Distaloy AE in both mixtures.
  • the preparation of the known mixture involves dry mixing of the iron-based powder, the lubricant according to the US patent and 0.3% by weight of graphite.
  • the organic binder was dissolved in acetone and added to the dry mixture and after thorough mixing. The acetone was removed and 0.06% by weight of Aerosil® was added to the dried mixture.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention concerns a method of preparing an iron-based powder comprising the steps of mixing and heating an iron-based powder, at least one oligomer amide type lubricant, at least one fatty acid and optionally one or more additives to a temperature above the melting point of the lubricant and subsequently cooling the obtained mixture. The invention also comprises the mixture of the iron-based powder, the oligomer amide type lubricant and the fatty acid.

Description

IRON POWDER COMPOSITION INCLUDING AN AMIDE TYPE LUBRICANT AND
A METHOD TO PREPARE IT
FIELD OF THE INVENTION
The present invention relates to metal powder compositions and a method of preparing such compositions. Particularly the invention relates to iron-based composi- tions having consistent apparent density and flowability at different temperatures.
BACKGROUND OF THE INVENTION
The powder metallurgy art generally uses different standard temperature regimes for the compaction of a metal powder to form a metal component . These include chill-pressing (pressing below ambient temperatures) , cold-pressing (pressing at ambient temperatures) , hot- pressing (pressing at temperatures above those at which the metal powder is capable of retaining work-hardening) , and warm-pressing (pressing at temperatures between cold- pressing and hot-pressing) .
Distinct advantages arise by pressing at temperatures above ambient temperature. The tensile strength and work hardening rate of most metals is reduced with increasing temperatures, and improved density and strength can be attained at lower compaction pressures. The extremely elevated temperatures of hot-pressing, however, introduce processing problems and accelerate wear of the dies. Therefore, current efforts are being directed towards the development of metal compositions suitable for warm-pressing processes .
The US patent 4,955,789 (Musella) describes warm compaction in general. According to this patent, lubri- cants generally used for cold compaction, e.g. zinc ste- arate, can be used for warm compaction as well. In prac- tice, however, it has proved impossible to use zinc ste- arate or ethylene bisstearamide (commercially available as ACRAWAX®.), which at present are the lubricants most frequently used for cold compaction, for warm compaction. The problems, which arise, are due to difficulties in filling the die in a satisfactory manner.
The US patents 5,744, 433 (Storstrom et al) and 5,154,881 (Rutz) disclose metal powder compositions including amide lubricants which are especially developed for warm compaction. The US patent 5,744, 433 discloses a lubricant for metallurgical powder compositions contains an oligomer of amide type, which has a weight-average molecular weight Mw of 30,000 at the most. In the US. Patent 5,154,881 the amide lubricant consists of the re- action product of a monocarboxylic acid, a dicarboxylic acid and a diamine. Especially preferred as a lubricant is ADVAWAX.®. 450, which is an ethylenebisstearamide product .
Although the lubricants disclosed in these two pat- ents are especially developed for warm compaction and work well in many cases it has been found that different problems are encountered when these lubricants are used in metal compositions intended for large scale production of sintered components.
OBJECTS OF THE INVENTION
An object of the present invention is to reduce or eliminate current problems associated with large scale production. Another object is to provide a new type of lubricant useful in metal compositions intended for compaction at elevated temperatures . Still another problem is to provide an iron-based powder composition distinguished by excellent flow rate and apparent density.
A further object is to provide a powder composition, which generates a minimum of dust and the preparation of which does not require the use of organic solvents.
Another object is to provide a method for warm compaction such a metal powder composition.
SUMMARY OF THE INVENTION
These objects are achieved by a powder composition comprising an iron-based powder, at least one oligomer amide type lubricant, at least one fatty acid and optionally one or more additives such as flow agents, process- ing aids and hard phases.
The method according to the invention includes the steps of
- mixing and heating the iron-based powder, the lubricant, the fatty acid and the additive, if any, to a tem- perature above the melting point of the lubricant and -cooling the obtained mixture.
DETAILED DESCRIPTION OF THE INVENTION
As used in the description and the appended claims, the expression "iron-based powder" encompasses powder essentially made up of pure iron; iron powder that has been prealloyed with other substances improving the strength, the hardening properties, the electromagnetic properties or other desirable properties of the end products; and particles of iron mixed with particles of such alloying elements (diffusion annealed mixture or purely mechanical mixture). Examples of alloying elements are nickel, copper, molybdenum, chromium, manganese, phosphorus, carbon in the form of graphite, and tungsten, which are used either separately or in combination, e.g. in the form of compounds (Fe3 P and FeMo) . Unexpectedly good results are obtained when the lubricants according to the invention are used in combination with iron-based powders having high compressability. Generally, such powders have a low carbon content, preferably below 0.04% by weight. Such powders include e.g. Distaloy AE, Astaloy Mo and ASC 100.29, all of which are commercially available from Hoganas AB, Sweden.
The lubricant used according to the present invention is new and may be represented by the following formula :
D-Cna-B-A-B-Ctπb-D
wherein D 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)nC0-
B is amino or carbonyl
A is alkylen having 4-16 C atoms optionally including up to 4 0 atoms ma is an integer 1-10 mb is an integer 1-10 n is an integer 5-11.
Preferably the lubricant has the chemical structure 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 alkylen having 6-14 C atoms optionally including up to 3 0 atoms, and ma and mb, which may be the same or different is an integer 2-5. Examples of such lubricants may be selected from the group consisting of
CH3 (CH2) 16CO-[HN(CH2) nCO]2-HN(CH2) ι2NH-[OC (CH2) nNH]2- OC(CH2)ι6CH3
CH3 (CH2) 16CO-[HN(CH2) nCO]2 -HN (CH2 ) 12NH-[OC (CH2) nNH]3- OC(CH2)lβCH3
CH3 (CH2) 16CO-[HN(CH2) nCO]3 -HN (CH2 ) 12NH-[OC (CH2 ) n H]3- OCCH2)i6CH3
CH3 (CH2) 16CO-[HN(CH2) ιχCO]3 -HN (CH2) 12NH-[OC (CH2) nNH]4-
OC(CH2)16CH3
CH3 (CH2) 16CO-[HN(CH2) nCO]4-HN(CH2) ι2NH-[OC(CH2) nNH]4-
Figure imgf000006_0001
CH3 (CH2) 16CO-[HN(CH2) nCO]4-HN (CH2 ) 12NH-[OC (CH2 ) nNH]5-
Figure imgf000006_0002
CH3 (CH2) ι6CO-[HN(CH2) nCO]5-HN(CH2) 12NH-[OC (CH2 ) nNH]5- OC(CH2)ι6CH3
Other examples are CH3)CO-HN(CH2)5CO-HN(CH2)2NH-OC(CH2)5NH-OC(CH3) having the
MW 370.49;
CH3 (CH2) 20CO-HN(CH2) nCO-HN (CH2) 12NH-OC (CH2) nNH-OC (CH2) 20CH3 having the MW 1240.10
CH3 (CH2) 20CO- [HN (CH2) 11CO] 10-HN (CH2) ι2NH- [OC (CH2) 11NH] 10- OC(CH2)2oCH3 having the MW 8738.04
CH3 (CH2) 4CO- [HN(CH2) lxCO] 3-HN (CH2) ι2NH- [OC (CH2) 11NH] 3-
OC(CH2)4CH3 having the MW 1580.53
CH3 (CH2) 4CO- [HN (CH2) 5CO] 7-HN (CH2) 6NH- [OC (CH2) 5NH] 7-OC (CH2) 4CH3 having the MW 1980.86 CH3 (CH2) 20CO- [HN (CH2) 5CO] 7-HN (CH2) 6NH- [OC (CH2) 5NH] 7-
OC(CH2)20CH3 having the MW 2429.69 and CH3 (CH2) 16NH- [OC (CH2) nNH] 4-CO (CH2) 10CO- [HN (CH2) nCO] 4-
HN(CH2)16CH3 having the MW 2283.73
The oligomer amide type lubricant, which is added to the iron-based powder is preferably in the form of a solid powder, can make up 0.1-1% by weight of the metal- powder composition, preferably 0.2-0.8% by weight, based on the total amount of the metal -powder composition. The possibility of using the lubricant according to the present invention in low amounts is an especially advanta- geous feature of the invention, since it enables high densities to be achieved
The fatty acid used according to the present inventions is preferably a fatty acid having 10-22 C atoms. Examples of such acids are oleic acid, stearic acid and palmitic acid. Although the amount of the fatty acid is small, the effects on flow rate and apparent density are remarkable. The amount of the fatty acid is normally 0.005-0.15, preferably 0.010-0.08 and most preferably 0.015-0.07 % calculated on the total weight of the powder composition. Fatty acid contents below 0.005 make it difficult to achieve an even distribution of the fatty acid. If the content is higher than 0.15 there is a considerable risk that the flow will deteriorate.
The melting point of the fatty acid should be lower than that of the amide oligomer lubricant.
Apart from the iron-based powder and the lubricant, the new powder composition may contain one or more addi- tives selected from the group consisting of processing aids and hard phases .
The processing aids used in the metal -powder composition may consist of talc, forsterite, manganese sul- phide, sulphur, molybdenum disulphide, boron nitride, tellurium, selenium, barium difluoride and calcium di- fluoride, which are used either separately or in combination.
The hard phases used in the metal -powder composition may consist of carbides of tungsten, vanadium, titanium, niobium, chromium, molybdenum, tantalum and zirconium, nitrides of aluminium, titanium, vanadium, molybdenum and chromium, Al203, and various ceramic materials.
A type of flow agent, which can be used according to the present invention, is disclosed in the US patent
5782954 (which is hereby incorporated by reference) . The flow agent, which is preferably a silicon dioxide, is used in an amount from about 0.005 to about 2 percent by weight, preferably from about 0.01 to about 1 percent by weight, and more preferably from about 0.025 to about 0.5 percent by weight, based on the total weight of the metallurgical composition. Furthermore, the flow agent should have an average particle size below about 40 nanometers. Preferred silicon oxides are the silicon dioxide materials, both hydrophilic and hydrophobic forms, commercially available as the Aerosil line of silicon dioxides, such as the Aerosil 200 and R812 products, from Degussa Corporation.
According to an embodiment of the invention the iron-based powder, at least one oligomer amide type lubricant, at least one fatty acid and optionally one or more additives, such as processing aids and hard phases, are heated to a temperature above the melting point of the lubricant; the obtained mixture is subsequently cooled to a temperature below the melting point of the lubricant and above the melting point of the fatty acid ; and a pulverulent flow agent is added to the obtained mixture, which is then mixed and cooled.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows the effect of the combination of the oligomer amide type lubricant defined above and a fatty acid (stearic acid) on the apparent density.
FIG. 2 shows the effect of the combination of the lubricant defined above and a fatty acid (stearic acid) on the flow rate.
The powder mixture tested was prepared by dry mixing Distaloy AE (an iron-based powder available from Hόganas AB, Sweden) with 0.6 % by weight of organic material which consisted of the oligomer amide type lubricant defined above and 0.03 or 0.05 % by weight of stearic acid. 0.3 % by weight of graphite was aslo added and the ob- tained mixture was heated to 165 °C. The mixture was cooled to 110 °C and 0.06 % by weight of Aerosil® was added at this temperature. Essentially the same results are obtained when the Aerosil is added at ambient temperature . The results disclosed in FIG.l and 2 respectively demonstrate that clear and unexpected effects on both apparent density and flow can be obtained with the powder compositions according to the present invention.
The above mixture which included 0.03% by weight of stearic acid was also tested with regard to the dust reduction in comparison with a mixture prepared according to the US patent 5 368 630. The known mixture also included 0.6% by weight of organic material but in this case the organic material consisted of 0.55% by weight of lubricant and 0.15% by weight of an organic binder (cellulose butyrate) . The iron-based powder was Distaloy AE in both mixtures. The preparation of the known mixture involves dry mixing of the iron-based powder, the lubricant according to the US patent and 0.3% by weight of graphite. The organic binder was dissolved in acetone and added to the dry mixture and after thorough mixing. The acetone was removed and 0.06% by weight of Aerosil® was added to the dried mixture.
In the following table results from the tests are summarised:
Figure imgf000010_0001

Claims

1. A powder composition comprising an iron-based powder, at least one oligomer amide type lubricant, a fatty acid and optionally one or more additives.
2. Composition according to claim 1, c h a r a c t e r i s e d in that the melting point of the fatty acid is lower than that of the amide lubricant.
3. Composition according to any one of the claims 1-2, c h a r a c t e r i s e d in that the fatty acid has 10-22 C atoms,
4. Composition according to claim 3, c h a r a c t e r i s e d in that the fatty acid is selected from the group consisting of oleic acid, stearic acid, palmitic acid or combinations thereof.
5. Composition according to any one of the claims 1-2 wherein the oligomer amide type lubricant may be represented by the following formula
D-Cma-B-A-B-Cmb-D
wherein D 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)nCO-
B is amino or carbonyl
A is alkylen having 4-16 C atoms optionally including up to 4 0 atoms m is an integer 1-10 n is an integer 5-11
6. Composition according to claim 5, c h a r a c - t e r i s e d in that the lubricant has the chemical structure wherein D is COR, wherein R is an aliphatic group 16 - 20 C atoms, C is -NH (CH)nCO- wherein n is 5 or 11; B is amino; A is alkylene having 6-14 C atoms op- tionally including up to 3 0 atoms, and ma and mb, which may be the same or different is an integer 2-5.
7. Composition according to any one of the claims 3-4, c h a r a c t e r i s e d in that the amount of the fatty acid is 0.015-0.15, preferably 0.02-0.08 and most preferably 0.03- 0.07% calculated on the total weight of the powder composition.
8. Composition according to any one of the claims 1-7, c h a r a c t e r i s e d in that the composition includes one or more additives selected form the group consisting of binders, flow agents, processing aids and hard phases .
9. Composition according to any one of the claims 1-8, c h a r a c t e r i s e d in that the flow agent is used in an amount from about 0.005 to about 2 percent by weight, preferably from about 0.01 to about 1 percent by weight, and more preferably from about 0.025 to about 0.5 percent by weight, based on the total weight of the metallurgical composition and has an average particle size below about 40 nanometers.
10. Composition according to claim 9, c h a r a c t e r i s e d in that the flow agent is a silicon dioxide.
11. Method of preparing an iron-based powder comprising the steps of:
a) mixing and heating an iron-based powder, at least one oligomer amide type lubricant, at least one fatty acid and optionally one or more additives to a temperature above the melting point of the lubricant; and b) cooling the obtained mixture.
12. Method according to claim 10, c h a r a c - t e r i s e d in that the mixture obtained in step a) is cooled to a temperature below the melting point of the lubricant and above the melting point of the fatty acid and that a pulverulent flow agent is added to the mixture .
PCT/SE2002/000763 2001-04-17 2002-04-17 Iron powder composition including an amide type lubricant and a method to prepare it Ceased WO2002083346A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE60205610T DE60205610T2 (en) 2001-04-17 2002-04-17 An Amide Lubricant-containing Iron Powder Composition and Method for Making Same
AT02724846T ATE302081T1 (en) 2001-04-17 2002-04-17 IRON POWDER COMPOSITION CONTAINING AN AMIDE LUBRICANT AND METHOD FOR THE PRODUCTION THEREOF
EP02724846A EP1387730B1 (en) 2001-04-17 2002-04-17 Iron powder composition including an amide type lubricant and a method to prepare it
JP2002581133A JP4126230B2 (en) 2001-04-17 2002-04-17 Iron powder composition containing amide type lubricant and method for producing the same
US10/201,954 US6872235B2 (en) 2001-04-17 2002-07-25 Iron powder composition

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Cited By (4)

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US6872235B2 (en) 2001-04-17 2005-03-29 Höganäs Ab Iron powder composition
US7786222B2 (en) 2005-05-20 2010-08-31 Ems-Chemie Ag Polyamide oligomers and their use
US7910652B2 (en) 2005-05-20 2011-03-22 Ems-Chemie Ag Polyamide molding materials with an improved flowability, the production thereof and its use
US10030209B2 (en) 2013-09-12 2018-07-24 National Research Council Of Canada Lubricant for powder metallurgy and metal powder compositions containing said lubricant

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SE0401644D0 (en) * 2004-06-23 2004-06-23 Hoeganaes Ab Lubricants for insulated soft magnetic iron-based powder compositions
JP2010285633A (en) * 2009-06-09 2010-12-24 Kobe Steel Ltd Method of producing powder mixture for powder metallurgy, and method of producing sintered body
JP5990100B2 (en) * 2009-09-08 2016-09-07 ホガナス アクチボラグ （パブル） Metal powder composition

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6872235B2 (en) 2001-04-17 2005-03-29 Höganäs Ab Iron powder composition
US7786222B2 (en) 2005-05-20 2010-08-31 Ems-Chemie Ag Polyamide oligomers and their use
US7910652B2 (en) 2005-05-20 2011-03-22 Ems-Chemie Ag Polyamide molding materials with an improved flowability, the production thereof and its use
US8138259B2 (en) 2005-05-20 2012-03-20 Ems-Chemie Ag Polyamide molding materials with an improved flowability, the production thereof and its use
US10030209B2 (en) 2013-09-12 2018-07-24 National Research Council Of Canada Lubricant for powder metallurgy and metal powder compositions containing said lubricant
US10975326B2 (en) 2013-09-12 2021-04-13 National Research Council Of Canada Lubricant for powder metallurgy and metal powder compositions containing said lubricant

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EP1387730B1 (en) 2005-08-17
TWI235183B (en) 2005-07-01
US20020178863A1 (en) 2002-12-05
DE60205610D1 (en) 2005-09-22
ATE302081T1 (en) 2005-09-15
ES2248547T3 (en) 2006-03-16
DE60205610T2 (en) 2006-02-09
EP1387730A1 (en) 2004-02-11
JP2004524450A (en) 2004-08-12
JP4126230B2 (en) 2008-07-30
SE0101343D0 (en) 2001-04-17
CN1503707A (en) 2004-06-09
CN1250684C (en) 2006-04-12

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