CN101022903A - Powder metal composition comprising secondary amides as lubricant and/or binder - Google Patents

Powder metal composition comprising secondary amides as lubricant and/or binder Download PDF

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CN101022903A
CN101022903A CNA2005800311616A CN200580031161A CN101022903A CN 101022903 A CN101022903 A CN 101022903A CN A2005800311616 A CNA2005800311616 A CN A2005800311616A CN 200580031161 A CN200580031161 A CN 200580031161A CN 101022903 A CN101022903 A CN 101022903A
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amide
composition
lubricant
base
iron
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CN101022903B (en
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A·阿赫林
M·拉姆斯泰特
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Hoganas AB
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Hoganas AB
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    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
  • Powder Metallurgy (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention relates to a powdered-metal combination which is used as a lubricant and/or agglomerant and comprises iron-base powder and at least a secondary amide with the general formula of R1-NH-CO-R2. In the formula, R1 is the same with or different from R2, and R1 and R2 are saturated or unsaturated aliphatic hydrocarbon groups with linear chains or branch chains. The invention further relates to a method for manufacturing green ware bodies with the powdered-metal combination and a method for manufacturing an adhesive iron-base powdered combination, the use of at least one secondary amide as an iron-base powdered lubricant and/or binder and a die wall lubricant.

Description

Comprise the powder metal composition of secondary amide as lubricant and/or binding agent
Technical field
The present invention relates to a kind of powder metal composition.Particularly, the present invention relates to a kind of lubricant that contains at least a secondary amide and/or powder metal composition of binding agent of comprising.The invention still further relates to a kind of method of making green compact, a kind of method of making bonding iron-based powder combination, and the purposes of lubricant and/or binding agent.
Background technology
Metal dust is used in by this metal dust is pressed in the mould under high pressure, from mould with the press body demoulding, and these goods of sintering and making in the industry of metallic article randomly.In most of powder metallurgy (PM) are used, comprise lubricant in the powder, during pressing being to be the lubrication that provides necessary between mould and the press body between the powder particle and during the demoulding from mould.The lubricated internal lubrication that is called that the lubricant that is comprised in the metal dust is realized, this with by the external lubrication that realizes on lubricant paint mould (powder the is pressed therein) wall is relative.Lubricated insufficient meeting causes the excessive friction between press body and the mould in the knockout course, causes the infringement of high demoulding energy and die surface and product surface.
Internal lubrication is realized by using special lubricant.Usually, these lubricants mix with iron or iron-based powder with powder type.Some lubricant also can be used for additive, and for example alloying element is bonded on iron or the iron-based particle.Thereby lubricant serves as binding agent in this case, and reduced or eliminated transport with handle during the additive that occurs separate.
Conventional lubricants during PM uses is a metallic soap, for example lithium stearate and zinc stearate.The shortcoming of such lubricant is owing to discharge metal from lubricant during sintering, the oxide contaminant of the metal in the lubricant inboard of sintering smelting furnace, another problem is may be formed with stain on the press body behind the sintering.Another conventional lubricants is ethylenebisstearamide (EBS).When using this lubricant, also may be formed with stain on the sintering back part, use for example zinc stearate but compare, the stain degree can be light.Because lubricant affects the compacting and the sintering property of metal dust strongly, therefore optimize with lubricator amount of institute, The Nomenclature Composition and Structure of Complexes for the density that obtains to have height and unanimity, the product of good any surface finish is most important.
Goal of the invention
The purpose of this invention is to provide a kind of new powder metal composition, it comprises lubricant and/or binding agent, and reduces or eliminated problem about high knockout press and sintered part unglazed scale.
Another object of the present invention provides a kind ofly makes stampings and through the method for sintering or heat treated parts, the method for the powder metal composition of preparation bonding and the purposes of this lubricant and/or binding agent.
Summary of the invention
These purposes realize by the powder metal composition that comprises iron-based powder and lubricant that contains at least a secondary amide and/or binding agent.The invention still further relates to a kind of by above-mentioned composition being suppressed the method for making green compact.
The method of the powder metal composition of described preparation bonding comprises: iron-based powder is mixed with at least a secondary amide, and this mixture is heated to the above temperature of fusing point of described at least a secondary amide.
In addition, the present invention relates to the purposes of described at least a secondary amide, and be used for the lubricated purposes of mold wall as the lubricated of iron-based powder and/or bonding reagent.
The specific embodiment
Lubricant in the powder metal composition of the present invention and/or binding agent are can be by at least a secondary amide of following general formula definition:
R 1-NH-CO-R 2
R wherein 1And R 2Group can be identical or different, is straight chain or branched, saturated or undersaturated aliphatic hydrocarbyl.
Preferably, R 1And R 2Comprise 10-24 carbon atom independently.
Preferably, R 1And R 2Be selected from alkyl and alkenyl.
Described alkyl can be selected from decyl, undecyl, dodecyl, tridecyl, myristyl, pentadecyl, cetyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl.
Described alkenyl can be selected from decene base, undecenyl, dodecenyl succinic, tridecylene base, tetradecene base, 15 carbene bases, hexadecene base, heptadecene base, vaccenic acid base, 19 carbene bases, eicosylene base, heneicosene base, two dodecenyl succinic, tricosene base, tetracosa carbon thiazolinyl.
Preferred secondary amide example is shown in Table 1.
Table 1 general formula: R 1-NH-CO-R 2
R 1Carbon number R 2Carbon number R 1 R 2 Chemical name Chemical constitution Popular name
18 15 The vaccenic acid base Pentadecyl Vaccenic acid base palmitic amide CH 3(CH 2) 7HC＝CH(CH 2) 8NHCO(CH 2) 14CH 4 The oleyl palmitamide
18 17 Octadecyl Heptadecyl The octadecyl kemanide S CH 3(CH 2) 17NHCO(CH 2) 16CH 3 Stearylstearic amide
18 17 The vaccenic acid base Heptadecyl Vaccenic acid base kemanide S CH 3(CH 2) 7HC＝CH(CH 2) 8NHCO(CH 2) 16CH 3 The oleyl stearic amide
18 17 Octadecyl The heptadecene base Octadecyl vaccenic acid acid amides CH 3(CH 2) 17NHCO(CH 2)7HC＝CH(CH 2) 7CH 3 The stearyl oleamide
18 18 17 21 Vaccenic acid base octadecyl The heptadecene base Vaccenic acid base vaccenic acid acid amides CH 3(CH 2) 7HC＝CH(CH 2) 8NHCO(CH 2) 7HC＝CH(CH 2) 7CH 3 The oleyl oleamide
The heneicosene base Octadecyl two dodecylene acid amides CH 3(CH 2) 17NHCO(CH 2) 11HC＝CH(CH 2) 7CH 3 The stearyl erucyl amide
18 21 The vaccenic acid base The heneicosene base Vaccenic acid base two dodecylene acid amides CH 3(CH 2) 7HC＝CH(CH 2) 8NHCO(CH 2) 11HC＝CH(CH 2) 7CH 3 The oleyl erucyl amide
22 17 Two dodecenyl succinic Heptadecyl Two dodecenyl succinic kemanide Ss CH 3(CH 2) 7HC＝CH(CH 2) 12NHCO(CH 2) 16CH 4 Two dodecenyl succinic stearic amides
22 17 Two dodecenyl succinic The heptadecene base Two dodecenyl succinic vaccenic acid acid amides CH 3(CH 2) 7HC＝CH(CH 2) 12NHCO(CH 2) 7HC＝CH(CH 2) 7CH 3 Two dodecenyl succinic oleamides
22 21 Two dodecenyl succinic The heneicosene base Two dodecenyl succinic, two dodecylene acid amides CH 3(CH 2) 7HC＝CH(CH 2) 12NHCO(CH 2) 11HC＝CH(CH 2) 7CH 3 Two dodecenyl succinic erucyl amides
24 11 Tetracosyl Undecyl Tetracosyl dodecane acid amides CH 3(CH 2) 23NHCO(CH 2) 10CH 3 Haze tallow base lauric amide
24 17 Tetracosyl Heptadecyl The tetracosyl kemanide S CH 3(CH 2) 23NHCO(CH 2) 16CH 3 Haze tallow base stearic amide
The amount of secondary amide can be the 0.05-2.0% of powder metal composition weight, preferred 0.05-1.0%.
A kind of embodiment of the present invention relates to a kind of powder metal composition that comprises lubricant and/or binding agent, and wherein lubricant and/or binding agent also comprise at least a primary amide except comprising described at least a secondary amide.Described at least a primary amide preferably has 12-24, preferred 14-22, the saturated or undersaturated fatty acid amide of 16-22 carbon atom most preferably.
Particularly preferred primary amide is stearic amide, mountain Yu acid acid amides, erucyl amide, palmitamide and arachidic acid acid amides.
Can be purchased according to primary amide of the present invention and secondary amide, perhaps can use approach well known to make by commercially available raw material.
The amount of primary amide and secondary amide can be the 0.05-2.0% of powder metal composition weight altogether, preferred 0.05-1.0%.
Comprise the embodiment of two kinds of acid amides for the present invention, the amount of described at least a primary amide can be 0.05-1.0 weight %, and the amount of described at least a secondary amide can be 0.05-1.0 weight %.
This lubricant and/or the binding agent form with each acid amides solids can be added in the powder metal composition.Average grain diameter can change, but preferably less than 150 μ m.
Replacedly, this lubricant and/or binding agent can be added in the powder metal composition as the fusion of acid amides and the granulate mixture that solidifies subsequently.This can then melt this mixture by acid amides is mixed with predetermined ratio, and cooling is worn into lubricant powder subsequently and finished.
Can be used as binding agent according at least a secondary amide of the present invention, to obtain bonding mixture, wherein Ren Xuan alloying element and described at least a secondary amide are adhered on the iron-based powder.This can pass through iron-based powder is mixed with at least a secondary amide according to the present invention, and this mixture is heated to the above temperature of fusing point of described at least a secondary amide.At least a primary amide can also be mixed in the said mixture, and the heating-up temperature of following can be lower than the fusing point of described primary amide.
Except above disclosed lubricant and/or binding agent,, can comprise other lubricant, for example zinc stearate, lithium stearate, EBS etc. if wish according to powder metal composition of the present invention.
For realizing the bonding of powder metal composition, can use the binding system of other type according to the present invention, for example have the hydroxy alkyl cellulose resin or the thermoplasticity phenolic resin of 1-4 carbon atom in alkyd (alkyde), cellulose ester resin, the alkyl.
As used in this specification and the appended claims, " iron-based " powder comprises the powder of being made up of pure iron substantially, improve the intensity of end article, the element alloyed iron powder of sclerosis character, electromagnetic property or other desirable properties with other in advance, and the iron particle (mixture of diffusion annealing or the mixture of pure machinery) that is mixed with these alloying element particles.The example of alloying element is carbon, nickel, silicon, boron, vanadium, titanium, aluminium, cobalt and the tungsten of copper, molybdenum, chromium, manganese, phosphorus, graphite form, and they are used alone or in combination, for example with compound (Fe 3P and FeMo) form use.
This iron-based powder can be used to make soft magnetism spare, and can be electric insulation for this application.The electrical insulator of this powder particle can be made by inorganic material.Specially suitable is disclosed insulator types among the US 6348265, wherein relates to the basic powder particle by the pure substantially iron barrier material that contains oxygen and phosphorus that form, that have insulation.Available insulating powder particle has Hoganas AB, the Somaloy of Sweden TM500 and 550.
Except iron-based powder and lubricant and/or binding agent, can comprise one or more according to powder metal composition of the present invention and be selected from processing aid and the hard additive of (phase) mutually.
Used processing aid can comprise talcum, forsterite, manganese sulfide, sulphur, molybdenum bisuphide, boron nitride, tellurium, selenium, bifluoride barium and bifluoride calcium in the powder metal composition, and they are used alone or in combination.
Used hard can comprise carbide, the Al of vanadium, molybdenum, chromium, tungsten mutually in the powder metal composition 2O 3, B 4C and various ceramic material.
The invention still further relates to a kind of method of making green compact, comprising: powder metal composition according to the present invention is pressed into press body, and wherein said composition comprises iron-based powder and contains general formula R 1-NH-CO-R 2The lubricant and/or the binding agent of at least a secondary amide, R wherein 1And R 2Identical or different, be straight chain or branched, saturated or undersaturated aliphatic hydrocarbyl.Can carry out sintering or heat treatment to this press body.
By means of routine techniques, iron-based powder, lubricant and/or binding agent and optional additive can be mixed into basic powder composition uniformly before pressing step.
Can preheating powder metal composition and/or mould before compacting.
The invention still further relates to will be as defined above at least a secondary amide as the purposes of the lubricated of iron or iron-based powder and/or bonding reagent.
Another embodiment of the present invention relates at least a secondary amide as defined above as the purposes of mold wall lubricant.
Accompanying drawing describes in detail
The use that Fig. 1 shows because of different lubricants causes that the stain of parts behind sintering forms.
1a) ethylenebisstearamide (EBS);
1b) oleyl palmitamide (according to secondary amide of the present invention).
Further describe the present invention by following non-limiting example now.
Embodiment
Below among the embodiment, use its formula to be disclosed in lubricant in the following table 2.
Table 2
Chemical name Structural formula* Amide type
Reference: ethylenebisstearamide (EBS) CH 3(CH 2) 16CONH(CH 2) 2NHCO(CH 2) 16CH 3 Bisamide
Stearic amide (S) CH 3(CH 2) 16CONH 2 Primary
Arachidic acid acid amides (A) CH 3(CH 2) 18CONH 2 Primary
Erucyl amide (E) CH 3(CH 2) 7CH＝CH(CH 2) 11CONH 2 Primary
Behenic acid acid amides (B) CH 3(CH 2) 20CONH 2 Primary
Stearylstearic amide (SS) R1＝C18:0    R2＝C17:0 Secondary
Two dodecenyl succinic stearic amides (ES) R1＝C22:1    R2＝C17:0 Secondary
Oleyl palmitamide (OP) R1＝C18:1    R2＝C15:0 Secondary
Stearyl erucyl amide (SE) R 1＝C18:0    R 2＝C21:1 Secondary
Oleyl stearic amide (OS) R 1＝C18:1    R 2＝C17:0 Secondary
Stearyl oleamide (SO) R＝C18:0     R 2＝C17:1 Secondary
* the structural formula of secondary amide is expressed as the aforementioned R1-NH-CO-R 2。
Embodiment 1
The lubricating property of the various combination of different secondary amide in the iron-based powder mix and secondary amide and primary amide is added in this embodiment checking to as powder.
With basic powder ASC 100.29 (from Hoganas AB, Sweden obtains) and 0.5 % by weight graphite (uf-4 of Kropfmuhl) and 0.8 % by weight according to the lubricant of table 3 and 4 at L
Figure A20058003116100111
Mixed 2 minutes in the dige blender. Ethylenebisstearamide (EBS, from Clariant, Germany obtains as Licowax TM) is as reference. The particle diameter of these lubricants is less than 150 μ m. Comprise each 50% (0.8 % of composition total weight) of these two kinds of acid amides that the composition of primary amide and secondary amide comprises.
In order to measure lubricating property, at room temperature take three kinds of different pressing pressures (400,600 and 800 MPa) compacting internal diameter as 45mm, external diameter is the ring of 55mm, high 10mm. In the process of the rolled-up stock demoulding, the record knockout press. After the demoulding, measure the green density of this rolled-up stock, and calculate total demoulding energy from mould that the sample demoulding is required/seal area.
Demoulding energy and the density of gained are shown in table 3 and 4. When using according to powder metal composition of the present invention, to compare and use the reference composition that comprises EBS, the demoulding that obtains can be lower.
Table 3 density and demoulding energy (secondary amide and reference)
Lubricant Premix
Green density (g/cm3) The demoulding can (J/cm2)
    400MPa     600MPa     800MPa     400MPa     600MPa     800MPa
EBS (reference)     6.70     7.04     7.17     19.2     26.1     28.2
 SS     6.72     7.06     7.19     17.6     24.7     27.9
 ES     6.78     7.12     7.23     16.3     20.3     20.8
 OP     6.78     7.14     7.25     16.7     21.3     20.3
 SE     6.78     7.13     7.24     16.8     21.9     21.8
 OS     6.78     7.13     7.24     17.7     21.3     20.5
 SO     6.79     7.13     7.23     15.9     21.4     20.4
Table 4 density and demoulding energy (secondary amide+primary amide 1: 1 and reference)
Lubricant Premix
Green density (g/cm3) The demoulding can (J/cm2)
   400MPa     600MPa     800MPa     400MPa     600MPa     800MPa
EBS (reference)     6.70     7.04     7.17     19.2     26.1     28.2
 SS+E     6.69     7.0 6     7.21     19.1     24.2     23.6
 OP+S     6.70     7.06     7.19     18.2     22.1     22.3
 ES+S     6.71     7.06     7.19     17.9     21.5     21.8
 ES+E     6.72     7.11     7.23     17.8     20.7     19.0
Embodiment 2
With basic powder ASC 100.29 and 2 % by weight copper (100 μ m), 0.8 % by weight graphite and 0.8 % by weight lubricant (a) EBS or (b) oleyl palmitamide) at LMixed 2 minutes in the dige blender. The particle diameter of lubricant is less than 150 μ m. For the stain behind the measurement component sintering forms, the column of diameter 64mm, high 32mm at room temperature is depressed into 7.1g/cm3Green density. The weight of a column is 700g. Comprising 90/10N2/H 2Atmosphere under 1120 ℃ with this parts sintering 15 minutes. The parts photo is shown in a) ethylenebisstearamide (EBS) and 1b) in the oleyl palmitamide of Fig. 1, wherein Fig. 1 stain of a) showing the parts (1b does not have stain) that made by powder composition according to the present invention of comparing forms.
Embodiment 3
The various combination that this embodiment verifies secondary amide and primary amide be fused together and the lubricating property in supercooling and the situation of milling before iron-based powder mix is mixed.
Make this lubricant combination according to following method: the hybrid lubricant of 50% primary amide and 50% secondary amide is fused together, then cooling under 80-110 ℃. Then, this material is ground to average grain diameter and is lower than 150 μ m.
With basic powder ASC 100.29 and 0.5 % by weight graphite and 0.8 % by weight lubricant combination (seeing Table 5) at L
Figure A20058003116100122
Mixed 2 minutes in the dige blender. In order to measure lubricating property, at room temperature take three kinds of different pressing pressures 400,600 and the ring of 800MPa compacting internal diameter as 45mm, external diameter as 55mm, high 10mm. Gained demoulding energy and density are shown in Table 5.
Table 5 density and demoulding energy (secondary amide+primary amide and reference)
Lubricant Melting is also solidified
Green density (g/cm3) The demoulding can (J/cm2)
    400     MPa     600     MPa   800   MPa     400     MPa     600     MPa   800   MPa
EBS (reference)     6.70     7.04   7.17     19.2     26.1   28.2
 SS+E     6.70     7.06   7.20     18.8     22.4   22.6
 OP+S     6.71     7.07   7.20     18.5     23.2   24.4
 ES+S     6.71     7.07   7.20     18.9     22.7   23.5
 ES+E     6.70     7.07   7.20     17.2     19.8   18.0
Test result in the comparison sheet 5 can see that the sample that is made by powder metal composition according to the present invention shows the demoulding energy lower than the sample that is made by known lubricants EBS.
Embodiment 4
This embodiment verifies the lubricated and cementing property of various combination in powder metal composition of acid amides.
The particle diameter of lubricant is lower than 150 μ m. Basic powder ASC 100.29 and 2 % by weight Cu-100,0.8 % by weight graphite and 0.8 % by weight are combined in L according to the lubricant/binding agent of table 6
Figure A20058003116100131
Mixed 2 minutes in the dige blender. Keep as reference with the mixture of EBS, and the mixture that during mixing will comprise acid amides in another blender is heated to above the fusing point of secondary amide, but is lower than the temperature of the fusing point of primary amide, subsequently cooling is so that additive is adhered on the iron powder. In this mixture, secondary amide thereby serve as binding agent, primary amide serves as lubricant. The fusion temperature of acid amides is disclosed in the table 7.
In addition, at room temperature take the internal diameter of three kinds of different pressing pressures 400,600 and 800 MPa compacting as 45mm, external diameter can measure as the ring of 55mm, high 10mm carries out the demoulding. Gained demoulding energy and green density are shown in Table 8.
The lubricant of table 6. embodiment 4/binding agent combination
Secondary amide 0.2 % by weight Primary amide 0.6 % by weight
  ES     B
  OP     S
  OP     B
EBS (reference 1) (O.8 % by weight)
The fusion temperature of table 7. acid amides
Acid amides Fusion temperature (℃)
    ES     72.9
    OP     66.9
    B     101.9
    S     106.6
Table 8. density and demoulding energy (secondary amide+primary amide and reference)
Binding agent/lubricant Melt bonded
Green density (g/cm 3) The demoulding can (J/cm 2)
400 MPa 600 MPa 800 MPa 400 MPa 600 MPa 800 MPa
ES+B 6.75 7.0 6 7.19 18.5 24.6 28.1
OP+S 6.73 7.0 9 7.18 19.3 26.6 28.3
OP+B 6.77 7.08 7.19 19.9 25.3 27.1
EBS (reference) 6.74 7.06 7.17 21.4 30.8 32.8
The sample that makes by lubricant/binding agent according to the present invention shows than using the reference lubricant, i.e. the demoulding energy that the sample that makes of EBS will be low.Use obtains having excellent surface smoothness according to the powder composition that comprises lubricant/binding agent of the present invention, and the compacting sintering spare that does not promptly have cut not have stain substantially to form is (under 1120 ℃ in 90/10 N 2/ H 2Middle sintering 30 minutes).
Embodiment 5
Thick soft magnetic iron-based powder that particle is wherein surrounded by inorganic insulator and secondary amide mix lubricant according to table 9.As the reference lubricant, use known substance zinc stearate and EBS.The particle diameter of used iron-based powder distributes and is disclosed in the table 10.
The gained mixture is transferred in the mould, and under the pressing pressure of 1100MPa, be pressed into the cylindric specimen (50g) of diameter 25mm with single shaft compacting motion.Used mold material is conventional tool steel.During the demoulding of compacting sample, the record knockout press.Calculating is total demoulding energy that the sample demoulding is required/seal area from mould.
Measurement result about the appearance of demoulding energy, green density and green state is shown in Table 9.Use powder metal composition according to the present invention has obtained than using reference composition to have the rolled-up stock of excellent appearance and low demoulding energy.
Table 9. density, demoulding energy and appearance
The mixture numbering Lubricant (0.2wt%) The demoulding can (J/cm 2) Green density (g/cm 3) Appearance
1 ES 76 7.65 Perfect
2 SE 71 7.66 Perfect
3 SS 78 7.63 Perfect
4 OP 76 7.66 Perfect
Reference 1 Zinc stearate 117 7.66 Can not accept
Reference 2 EBS 113 7.64 Can not accept
Table 10
Particle diameter (μ m) Corase meal (wt%)
＞425 0.1
425-212 64.2
212-150 34.1
150-106 1.1
106-75 0.3
45-75 0.2
＜45 0

Claims (20)

1. the powder metal composition that comprises iron-based powder and lubricant and/or binding agent, wherein said lubricant and/or binding agent comprise at least a secondary amide of following general formula:
R 1-NH-CO-R 2
It is characterized in that R 1And R 2Identical or different, be straight chain or branched, saturated or undersaturated aliphatic hydrocarbyl.
2. composition as claimed in claim 1, wherein R 1And R 2Comprise 10-24 carbon atom independently.
3. composition as claimed in claim 1 or 2, wherein R 1And R 2Be selected from alkyl and alkenyl.
4. composition as claimed in claim 3, wherein said alkyl is selected from decyl, undecyl, dodecyl, tridecyl, myristyl, pentadecyl, cetyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl.
5. composition as claimed in claim 3, wherein said alkenyl are selected from decene base, undecenyl, dodecenyl succinic, tridecylene base, tetradecene base, 15 carbene bases, hexadecene base, heptadecene base, vaccenic acid base, 19 carbene bases, eicosylene base, heneicosene base, two dodecenyl succinic, tricosene base, tetracosa carbon thiazolinyl.
6. composition as claimed in claim 1, wherein said secondary amide are selected from oleyl palmitamide, stearylstearic amide, oleyl stearic amide, stearyl oleamide, oleyl oleamide, stearyl erucyl amide, oleyl erucyl amide, two dodecenyl succinic stearic amides, two dodecenyl succinic oleamides, two dodecenyl succinic erucyl amides, haze tallow base lauric amide, haze tallow base stearic amide.
7. composition as claimed in claim 1, it also comprises at least a primary amide.
8. composition as claimed in claim 7, wherein said primary amide are the acid amides with saturated or undersaturated straight chain fatty acid of 12-24 carbon atom.
9. composition as claimed in claim 7, wherein said primary amide are selected from palmitamide, stearic amide, arachidic acid acid amides, mountain Yu acid acid amides and erucyl amide.
10. as each described composition among the claim 1-9, wherein said lubricant is graininess.
11. as each described composition among the claim 7-9, the granulate mixture that wherein said lubricant comprises the fusion of described at least a secondary amide and at least a primary amide and solidifies subsequently.
12. as each described composition among the claim 1-9, wherein said composition is bonding mixture.
13. composition as claimed in claim 12, wherein said at least a secondary amide is as binding agent.
14. as each described composition among the claim 1-9, wherein the iron-based particle is surrounded by the inorganic coating of insulation.
15. a method of making green compact comprises:
To be pressed into press body as each described powder metal composition among the claim 1-9.
16. method as claimed in claim 15 also comprises heat treatment or sintering step.
17. a method of making bonding iron-based powder combination comprises:
With iron-based powder with mix as each described at least a secondary amide among the claim 1-9;
Described mixture is heated to the temperature more than the fusing point of described at least a secondary amide.
18. method as claimed in claim 17, wherein said mixture also comprises at least a primary amide, and described heating-up temperature is lower than the fusing point of described primary amide.
19. as the purposes of each described lubricant and/or binding agent among the claim 1-9 as the lubricated of iron-based powder and/or bonding reagent.
20. as each described lubricant among the claim 1-9 as the purposes of mold wall lubricant.
CN2005800311616A 2004-09-17 2005-09-16 Powder metal composition comprising secondary amides as lubricant and/or binder Active CN101022903B (en)

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EP1812187B1 (en) 2010-11-10
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CA2580509A1 (en) 2006-03-23
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RU2007114275A (en) 2008-10-27
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CA2580509C (en) 2010-11-16

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