EP0968068B1 - Adjuvant de compactage pour produire des pieces moulees frittables a partir d'une poudre de metal - Google Patents

Adjuvant de compactage pour produire des pieces moulees frittables a partir d'une poudre de metal Download PDF

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Publication number
EP0968068B1
EP0968068B1 EP98964406A EP98964406A EP0968068B1 EP 0968068 B1 EP0968068 B1 EP 0968068B1 EP 98964406 A EP98964406 A EP 98964406A EP 98964406 A EP98964406 A EP 98964406A EP 0968068 B1 EP0968068 B1 EP 0968068B1
Authority
EP
European Patent Office
Prior art keywords
compacting
metal powder
auxiliary
pressing
powder
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.)
Expired - Lifetime
Application number
EP98964406A
Other languages
German (de)
English (en)
Other versions
EP0968068A1 (fr
Inventor
René LINDENAU
Klaus Dollmeier
Wieland Kynast
Jens Wahnschaffe
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.)
GKN Sinter Metals GmbH
Original Assignee
GKN Sinter Metals GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GKN Sinter Metals GmbH filed Critical GKN Sinter Metals GmbH
Publication of EP0968068A1 publication Critical patent/EP0968068A1/fr
Application granted granted Critical
Publication of EP0968068B1 publication Critical patent/EP0968068B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
    • E05Y2900/13—Type of wing
    • E05Y2900/132—Doors
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
    • E05Y2900/13—Type of wing
    • E05Y2900/148—Windows

Definitions

  • the density of the finished sintered molded part depends on this essentially depends on the green density achieved, whereby different than when pressing ceramic powders the metal powder particles because of their different crystalline structure and the associated number of movable lattice construction errors undergo plastic deformation.
  • the particle geometry - also different from ceramic powders - is the lubricity of the individual with metallic powders Powder particles reduced against each other, so that even the loose Filling in the mold has a pore volume, which at Presses almost only when very high pressures are applied can be completely eliminated.
  • high pressures have high wear on the pressing tool during the compression process and also lead to increased sliding friction the finished green body in the press die, so that here also higher ejection forces with accordingly increased wear must be applied. High ejection forces however, pose a risk of undesirable local Post-compaction and cracking of the green compact in itself.
  • EP-A-0 375 627 Proposed method in which the metal powder to be pressed with one liquefied by a liquid solvent Lubricant is added.
  • a lubricant metal stearates, in particular lithium or zinc stearates as well as paraffins, waxes, natural or synthetic Fat derivatives proposed, for example, with organic Paraffinic solvents as a liquid solvent initially be liquefied.
  • the disadvantage of this method is on the one hand in that the dry metal powder with a two-component lubricant system, namely the stearates and have to be mixed with the solvent first, this premix must be largely homogeneous.
  • From EP 0 559 987 is a metallurgical powder composition known iron-based, which is an organic binder for the iron-based powder components and the alloy powder components contains. Contains to improve the pressing behavior the organic binder contains a proportion of polyalkylene oxide, which have a molecular weight of at least 7000 g / mol should, however, much higher molecular weights are preferred.
  • US 4,595,558 discloses a process for making molded Alloy products. To avoid in particular the separation of mixtures from the base metal with the Alloy metal is proposed as a process aid add, with a polyethylene glycol for this purpose Molecular weight above 200 g / mol is preferred. From the alloy mix with aids using a roller press Briquettes made, for example, in melted Aluminum are given, then a good solution of the Briquettes in the melt took place.
  • US 5 432 223 discloses a binder system for manufacture of segregation-free iron powder mixtures with an alloy metal comprising polyvinyl pyrrolidones and as plasticizers for example polyethylene glycol with molecular weights essentially below 10,000 g / mol. From these mixtures green bodies are produced, the green strengths have in an area that is approximately that of green bodies without the addition of polyvinylpyrrolidone and polyethylene glycol correspond.
  • EP 0 501 602 A2 discloses a method for faster removal a binder from powder mixtures for metal injection molding, in which the binder content at least 11% by weight, based on the amount of metal powder used, is.
  • the binder can, among others Ingredients contain polyethylene glycols.
  • the invention is based on the object described above Improve procedures.
  • This task is solved with a manufacturing process of sinterable metallic moldings from a metal powder, which is mixed with a pressing aid, the Pressing aids in an amount of up to 5% by weight, preferably below 1% by weight, based on the metal powder content, in the mixture is contained and at least partially components from the family of polyethylene glycols with a molecular weight contains between 3000 and 6500 g / mol, the Mixture poured into a mold and after compaction ejected under pressure as a pressed molded part from the mold becomes.
  • pressing aids at least some components from the family of polyethylene glycols contain, has surprisingly shown that to achieve high Density and high green strength much lower pressures than to be used with other pressing aids and that also for ejecting the pressed molded part from the Necessary forces are significantly reduced, so that the above-mentioned disadvantages of the known methods are avoided.
  • a special binder in the powder mix it is not necessary, because of the "lubrication” the moving relative to each other during the pressing process Powder particles already have a high density as well as a high one Strength of the green body due to the much higher "packing density" of powder particles and thus an increase in direct contacts between the metal particles in the powder can be.
  • Metal powder in the sense the invention refers to that for the production of the molded part intended powder mixture with all alloy and other surcharges, with the exception of pressing aids.
  • a special advantage of the family of polyethylene glycols selected pressing aids is that by an appropriate choice of molecular weight influence the pressing parameters can be taken, both in terms of the flow behavior when mixing and filling the shape, as well as the softening point and thus the temperature control and the material flow during Pressing operation.
  • Pressing aids proposed according to the invention with its softening point is between 40 ° C and 80 ° C, so that for example in series production which is continuously Press-setting tool temperature is usually sufficient for a perfect "flow" of the powder mixture to effect when filling into the mold as well as when pressing. Accordingly, this can be done with the pressing aid added metal powder to the mold at room temperature Fill.
  • Another advantage of the low softening temperature is in the fact that immediately after filling in first the pressing aids in the with the warmed up Form walls of metal powder in contact with their Obtain softening temperature, so that the subsequent Pressing the relative movements occurring on the tool walls between powder filling and pressing tool already "lubricated” and so the friction in these areas is reduced. At the subsequent full Pressurization will result in the entire powder filling the pressing pressure heated above the softening point, so that also the internal, as a result of the particle geometry of the metal powder caused relatively large relative movements in the metal powder filling by the effect of lubricating pressing aid can be facilitated.
  • the softening temperature of the pressing aid must be so can be set taking into account the working temperature the outer surfaces of the green compact during the pressing process not to be "moistened” by the pressing aid to a Avoid sticking of loose powder particles.
  • the pressing aid can be mixed into the metal powder "cold", i.e. H. at room temperature. Particularly useful is the warm mixing of the pressing aid with the metal powder, for example in a heated drum mixer with subsequent cooling with simultaneous agitation, whereby the temperature of the mixer is initially slightly higher than that intended softening temperature set for the pressing process becomes.
  • the mixing temperature is appropriate 50-100 ° C, preferably 85 ° C. After cooling down it is then a free-flowing powder mixture is available, which is a good one Manageability guaranteed when filling the mold.
  • the pressing aid has a liquid consistency
  • Solvents are particularly suitable for alcohols, such as ethanol, Isopropanol or benzyl alcohol, which after spraying quickly evaporate so that the obtained with the pressing aid staggered powder is "dry" and the required trickle or. Flowability is maintained when filling the mold remains.
  • the hydroxyl number of the pressing aid can be between 500 and 700, while the density can be between 0.9 and 1.25 g / cm 3 .
  • Polyethylene glycols are also useful different molecular weights.
  • Polyethylene glycols with different molecular weights can be deliberately a pressing aid that with respect Blending properties, softening point and Lubrication properties exactly to the compression method used can be coordinated.
  • the polyethylene glycol proposed here as a pressing aid can be characterized using the empirical formula given below: H - [- O-CH 2 -CH 2 -] n -OH
  • the increase in press densities to be achieved with polyethylene glycol do not primarily take place via a temperature-dependent Change in the physical properties of the metallic Powder, such as in the process described in EP-A-0 375 627, but essentially about improving the Lubrication behavior in the powder to be compacted itself, in particular but between the die wall and the powder filling with an appropriate temperature control on the pressing tools.
  • Another advantage of the pressing aid proposed here is that it is thermal before sintering is easier to eliminate, for example via diffusion processes, Escape via capillary forces, sublimation, evaporation or similar. This is what distinguishes the invention Pressing aids also through an environmentally friendly Disposal option, as it is through pyrolysis in water vapor and carbon dioxide can be broken down.
  • metal stearates As a lubricant to reduce friction between the die wall and powder particles on the one hand and between powder particles on the other hand, metal stearates have been used in particular Lithium or zinc stearates as well as paraffins, waxes, natural or synthetic fat derivatives used. at newer developments are becoming multi-component high temperature resistant (i.e. approx. 130 ° C here) lubricant that thus a reduction in the yield strength of the material to be pressed Cause metal and consequently lead to higher compression densities, as also described in EP-A-0 375 627.
  • a water-atomized iron powder was used for an experiment 2% copper and 0.6% carbon each used in powder form.
  • the curves show the dependence of the density from the pressure.
  • Curve 1 shows the result of the application as a reference curve the cold pressing process with a conventional one Lubricant in the form of an amide wax or micro wax, for example ethylene bisstearoylamide.
  • Curve 2 shows the result when using the hot pressing process according to the state of the art. Here there is already a clear improvement. in this connection however, the disadvantages described must be accepted become.
  • curve 3 shows the result in the application of the method according to the invention, which is even clearer Leads to an increase in the final density.
  • Table 1 shows the metal powder specified above containing 0.6% by weight of polyethylene glycol with a mol weight in the range of about 6000 g / mol, that cold, d. H. mixed at room temperature and also pressed has been.
  • the table shows what is practically proportional to the baling pressure Increase in green density and green strength.
  • Table 2 shows the result for a starting material shown with the same composition, but mixed warm but was cold pressed. Here shows up next to one Increase in green density a significant increase in green strength compared to the values for cold pressing one cold mixed powder.
  • Table 3 shows the values for a cold mixed powder, that is pressed warm.
  • the achievable values for the green density correspond to the above values, while the green strength shows a significant increase, what the interaction between the type of polyethylene glycol used with low molecular weight and temperature control shows when pressing.
  • the increase in green strength is probably due to the better Flow behavior of the pressing aid with the relative low molecular weight in the metal powder matrix below Pressure and temperature due to the fact that very homogeneous mixture of pressing aids and metal powder and secondly because of the thin already achieved during mixing "Lubricant film" that extends even further when hot pressed reduced, a very between the individual metal particles much higher frequency of direct contact between metallic Surfaces is given and so the one described above plastic deformation and entanglement of the metal powder particles can be achieved.
  • Table 5 shows the values for the metal powder as a reference reproduced, an amide wax mixed cold as a pressing aid and that was cold pressed.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)

Claims (9)

  1. Procédé de fabrication de pièces moulées métalliques frittables à partir d'une poudre métallique mélangée avec un adjuvant de compactage, l'adjuvant de compactage étant contenu dans le mélange à une quantité allant jusqu'à 5% en poids, de préférence inférieure à 1% en poids, par rapport à la quantité de poudre métallique, et contenant au moins partiellement des composants de la famille des polyéthylèneglycols d'un poids moléculaire compris entre 3000 et 6500 g/mol, le mélange étant versé dans un moule de compactage et rejeté de ce moule sous la forme de pièce moulée comprimée après le compactage sous pression.
  2. Procédé selon la revendication 1, caractérisé en ce que l'adjuvant de compactage présente un point de ramollissement compris entre 40°C et 80°C.
  3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que l'adjuvant de compactage présente un indice d'hydroxyle compris entre 500 et 700.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que l'adjuvant de compactage présente une densité de 0,9 à 1,25 g/cm3.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la poudre métallique mélangée avec l'adjuvant de compactage est versée dans le moule de compactage à une température inférieure au point de ramollissement de l'adjuvant de compactage utilisé, de sorte que l'adjuvant de compactage se ramollisse par l'énergie introduite dans le moule de compactage, de préférence pendant le compactage (compactage à chaud).
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la poudre métallique mélangée avec l'adjuvant de compactage est versée dans le moule de compactage à une température inférieure au point de ramollissement de l'adjuvant de compactage utilisé et qu'elle est compactée lors du compactage sans apport d'énergie (compactage à froid).
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que l'adjuvant de compactage est ajouté à la poudre métallique à une température qui se situe au moins dans la plage du point de ramollissement de l'adjuvant de compactage (mélange à chaud).
  8. Mélange pour la fabrication de pièces moulées métalliques frittables à partir d'une poudre métallique mélangée avec un adjuvant de compactage, l'adjuvant de compactage étant contenu dans le mélange à une quantité allant jusqu'à 5% en poids, de préférence inférieure à 1% en poids, par rapport à la part de poudre métallique, et contenant au moins partiellement des composants de la famille des polyéthylèneglycols d'un poids moléculaire compris entre 3000 et 6500 g/mol.
  9. Pièces moulées métalliques frittables fabriquées grâce au procédé selon l'une des revendications 1 à 7.
EP98964406A 1997-11-28 1998-11-18 Adjuvant de compactage pour produire des pieces moulees frittables a partir d'une poudre de metal Expired - Lifetime EP0968068B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19752993 1997-11-28
DE19752993A DE19752993A1 (de) 1997-11-28 1997-11-28 Verfahren zur Herstellung von sinterbaren metallischen Formteilen aus einem Metallpulver
PCT/EP1998/007406 WO1999028069A1 (fr) 1997-11-28 1998-11-18 Adjuvant de compactage pour produire des pieces moulees frittables a partir d'une poudre de metal

Publications (2)

Publication Number Publication Date
EP0968068A1 EP0968068A1 (fr) 2000-01-05
EP0968068B1 true EP0968068B1 (fr) 2002-03-27

Family

ID=7850223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98964406A Expired - Lifetime EP0968068B1 (fr) 1997-11-28 1998-11-18 Adjuvant de compactage pour produire des pieces moulees frittables a partir d'une poudre de metal

Country Status (12)

Country Link
US (1) US6224823B1 (fr)
EP (1) EP0968068B1 (fr)
JP (1) JP3386078B2 (fr)
KR (1) KR100341359B1 (fr)
AR (1) AR009920A1 (fr)
AT (1) ATE214988T1 (fr)
BR (1) BR9807116A (fr)
CA (1) CA2279275C (fr)
DE (2) DE19752993A1 (fr)
ES (1) ES2173662T3 (fr)
TW (1) TW434064B (fr)
WO (1) WO1999028069A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3165302A1 (fr) 2015-11-03 2017-05-10 Wachs-Chemie Elsteraue e.K. Lubrifiant a base de cire de canne a sucre

Families Citing this family (10)

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Publication number Priority date Publication date Assignee Title
DE10101471A1 (de) * 2001-01-12 2002-07-25 Gkn Sinter Metals Gmbh Verfahren zur Herstellung eines gesinterten Bauteils mit überlagerten Schwingungen während des Preßvorgangs
DE10111325C1 (de) * 2001-03-08 2002-10-02 Gkn Sinter Metals Gmbh Verfahren zur Herstellung eines gesinterten metallischen Bauteils mit wenigstens einer Bohrung
SE0103398D0 (sv) * 2001-10-12 2001-10-12 Hoeganaes Ab Lubricant powder for powder metallurgy
US6689188B2 (en) * 2002-01-25 2004-02-10 Hoeganes Corporation Powder metallurgy lubricant compositions and methods for using the same
US6802885B2 (en) * 2002-01-25 2004-10-12 Hoeganaes Corporation Powder metallurgy lubricant compositions and methods for using the same
DE10244486A1 (de) * 2002-09-24 2004-04-01 Gkn Sinter Metals Gmbh Mischung zur Herstellung von gesinterten Formteilen
US7237730B2 (en) * 2005-03-17 2007-07-03 Pratt & Whitney Canada Corp. Modular fuel nozzle and method of making
US8316541B2 (en) * 2007-06-29 2012-11-27 Pratt & Whitney Canada Corp. Combustor heat shield with integrated louver and method of manufacturing the same
US7543383B2 (en) 2007-07-24 2009-06-09 Pratt & Whitney Canada Corp. Method for manufacturing of fuel nozzle floating collar
CA3079312C (fr) 2013-09-12 2022-05-17 National Research Council Of Canada Lubrifiant pour metallurgie des poudres et compositions de poudre metallique contenant ledit lubrifiant

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SE427434B (sv) * 1980-03-06 1983-04-11 Hoeganaes Ab Jernbaserad pulverblandning med tillsats mot avblandning och/eller damning
US4485182A (en) * 1982-07-28 1984-11-27 Ibiden Kabushiki Kaisha Powder composition for producing sintered ceramic
US4595558A (en) * 1985-05-17 1986-06-17 Kerr-Mcgee Chemical Corporation Additive agents for use in the manufacture of molded particulate metal articles
DE4003219A1 (de) 1989-10-24 1991-08-08 Basf Ag Verfahren zur herstellung von formulierungen aus keramischen und/oder metallischen fasern
US5079198A (en) * 1990-07-24 1992-01-07 Eaton Corporation Ceramic phase in sintered silicon nitride containing cerium, aluminum, and iron
US5194203A (en) 1991-02-28 1993-03-16 Mitsui Mining & Smelting Co., Ltd. Methods of removing binder from powder moldings
US5328657A (en) * 1992-02-26 1994-07-12 Drexel University Method of molding metal particles
US5298055A (en) 1992-03-09 1994-03-29 Hoeganaes Corporation Iron-based powder mixtures containing binder-lubricant
DE69307172T2 (de) * 1992-03-16 1997-04-24 Kawasaki Steel Co Bindersystem für den Gebrauch beim Spritzgiessen von sinterfähigen Pulvern und dieses Bindersystem enthaltende Formmasse
US5308556A (en) * 1993-02-23 1994-05-03 Corning Incorporated Method of making extrusion dies from powders
US5432223A (en) 1994-08-16 1995-07-11 National Research Council Of Canada Segregation-free metallurgical blends containing a modified PVP binder
US5498276A (en) 1994-09-14 1996-03-12 Hoeganaes Corporation Iron-based powder compositions containing green strengh enhancing lubricants
US5782954A (en) 1995-06-07 1998-07-21 Hoeganaes Corporation Iron-based metallurgical compositions containing flow agents and methods for using same
JP2003526693A (ja) 1997-10-21 2003-09-09 ヘガネス・コーポレーシヨン 結合剤／潤滑剤を含有する改良された冶金用組成物及びその製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3165302A1 (fr) 2015-11-03 2017-05-10 Wachs-Chemie Elsteraue e.K. Lubrifiant a base de cire de canne a sucre

Also Published As

Publication number Publication date
KR100341359B1 (ko) 2002-06-22
CA2279275C (fr) 2006-04-18
JP3386078B2 (ja) 2003-03-10
JP2000517004A (ja) 2000-12-19
WO1999028069A1 (fr) 1999-06-10
TW434064B (en) 2001-05-16
AR009920A1 (es) 2000-05-03
DE19752993A1 (de) 1999-06-02
ES2173662T3 (es) 2002-10-16
EP0968068A1 (fr) 2000-01-05
ATE214988T1 (de) 2002-04-15
CA2279275A1 (fr) 1999-06-10
KR20000070202A (ko) 2000-11-25
US6224823B1 (en) 2001-05-01
DE59803513D1 (de) 2002-05-02
BR9807116A (pt) 2000-04-25

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