EP0392405A2 - Procédé de déparaffinage et de modification des propriétés de produits métalliques moulés par injection - Google Patents

Procédé de déparaffinage et de modification des propriétés de produits métalliques moulés par injection Download PDF

Info

Publication number
EP0392405A2
EP0392405A2 EP90106728A EP90106728A EP0392405A2 EP 0392405 A2 EP0392405 A2 EP 0392405A2 EP 90106728 A EP90106728 A EP 90106728A EP 90106728 A EP90106728 A EP 90106728A EP 0392405 A2 EP0392405 A2 EP 0392405A2
Authority
EP
European Patent Office
Prior art keywords
metal
binder
oxide
dewaxing
parts
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.)
Granted
Application number
EP90106728A
Other languages
German (de)
English (en)
Other versions
EP0392405A3 (en
EP0392405B1 (fr
Inventor
Martin Bloemacher
Reinhold Schlegel
Dieter Dr. Weinand
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of EP0392405A2 publication Critical patent/EP0392405A2/fr
Publication of EP0392405A3 publication Critical patent/EP0392405A3/de
Application granted granted Critical
Publication of EP0392405B1 publication Critical patent/EP0392405B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
    • 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
    • B22F3/10—Sintering only
    • B22F3/1017—Multiple heating or additional steps
    • B22F3/1021—Removal of binder or filler
    • 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
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • 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
    • C22C33/0235—Starting from compounds, e.g. oxides
    • 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
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • the present invention relates to a method for dewaxing injection-molded metal parts from a metal / binder mixture (metal injection molding).
  • MIM Metal Injection Molding
  • Alloys commonly used for the MIM are Fe, Fe-Ni, Fe-P and stainless steel.
  • Finely divided metal powders - often carbonyl iron powder (CEP) and mixtures with other alloy powders - are mixed with a binder and shaped into the green body using injection molding technology. Subsequent sintering achieves final densities of around 94%.
  • CEP carbonyl iron powder
  • the binder is intended to give the mixture the viscosity necessary for spraying and to hold the green compact together.
  • the subsequent removal of the binder has proven to be the time and quality determining factor of the process.
  • binder many-component systems made of low-molecular, thermoplastic plastics, waxes, resins and special additives, but also water-soluble binders based on cellulose are used.
  • binder system which binder system is used depends primarily on the powder particle size and morphology.
  • the proportion by weight of the binder in the finished mixture is approximately between 7% and 20% (US Pat. No. 3,989,518, GB 808 583).
  • thermoplastic binders have become increasingly popular.
  • Polyethylene and its low molecular weight waxes should be mentioned here in particular.
  • Patents GB 779 242, US 3,989,518 and US 4,431,449 describe the thermal decomposition of the different binder.
  • the time required for the dewaxing process can vary widely and can be up to several days.
  • the object of the present invention is accordingly to shorten the necessary dewaxing cycle by changing the metal / binder mixture and to improve the density of the parts thus produced and sintered.
  • the present invention relates primarily to the metallic part of the metal / binder mixture.
  • a four-component plastic mixture (a long-chain polyethylene and 3 polyethylene waxes with different melting points) has proven to be a practical binder.
  • binder systems can also be used, e.g. Polystyrene and polypropylene.
  • the iron oxide is preferably an iron oxide produced via the carbonyl process.
  • iron pentacarbonyl Fe (CO) 5
  • Fe (CO) 5 iron pentacarbonyl
  • the oxide is added to the metal at 2 to 30% by weight, preferably at 4 to 10% by weight.
  • the surface area of the oxide is 10 to 120 m2 / g, preferably 70 to 110 m2 / g.
  • thermoplastic binder was removed from the metal / oxide / binder mixtures produced in this way, the time required was clearly reduced.
  • parts made of metal / binder mixtures without oxide showed bubbles and cracks after a temperature treatment of 36 hours.
  • parts which were produced from the metal / oxide binder mixture according to the invention by grinding 4 to 10% by weight of carbonyl iron oxide did not show any cracks or bubbles after temperature treatments of about 14 hours.
  • the carbonyl iron powder OM from BASF used as a metal component has a carbon content of about 0.9%.
  • the specific surface area of the oxide showed a similar influence on the removal of the binder.
  • the effect of the specific surface was particularly evident in the density of the sintered parts. With increasing specific surface area of the oxide, the density of the sintered parts increases.
  • Carbonyl iron oxide with a surface area of 110 m2 / g has proven to be outstanding, with which the highest density of the sintered part was determined in the shortest time required to remove the binder.
  • the chunks resulting from the cooling mass could then be processed into granules in a granulating machine.
  • This granulate was injection molded with a conventional injection molding machine into small round parts with a diameter of about 12 m and a wall thickness of 2 mm.
  • the process from mixing in the Sigma mixer to spraying was identical to that for the metal / binder mixture.
  • the metal powder was ground together with the carbonyl iron oxide in a 200 liter mill.
  • the mill was filled with 60 kg of the product and 200 kg of grinding media (Cylpebs) and operated at 15 rpm.
  • the parts produced from the metal / binder mixture were heated in nitrogen to remove the binder at a linear temperature profile from room temperature to about 480 ° C. and held at the final temperature for 1 hour.
  • the furnace was constantly flushed with 120 l / h nitrogen.
  • the sintering process was kept the same for all examples.
  • the mixture was heated to 900 ° C. in a hydrogen atmosphere and the temperature was held for 15 minutes.
  • the mixture was then heated to 1200 ° C. and held for 4 hours.
  • the oven then cooled to room temperature.
  • Example 2 The parts treated according to Example 1 reached a maximum density of about 7.2 g / cm3.
  • the maximum density of the sintered parts reached was about 7.6 g / cm3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Nonmetallic Welding Materials (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP90106728A 1989-04-14 1990-04-07 Procédé de déparaffinage et de modification des propriétés de produits métalliques moulés par injection Expired - Lifetime EP0392405B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3912298 1989-04-14
DE3912298A DE3912298A1 (de) 1989-04-14 1989-04-14 Verfahren zum entwachsen und zur verbesserung der eigenschaften spritzgegossener metallteile

Publications (3)

Publication Number Publication Date
EP0392405A2 true EP0392405A2 (fr) 1990-10-17
EP0392405A3 EP0392405A3 (en) 1990-12-05
EP0392405B1 EP0392405B1 (fr) 1994-07-27

Family

ID=6378681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90106728A Expired - Lifetime EP0392405B1 (fr) 1989-04-14 1990-04-07 Procédé de déparaffinage et de modification des propriétés de produits métalliques moulés par injection

Country Status (7)

Country Link
US (1) US5009841A (fr)
EP (1) EP0392405B1 (fr)
JP (1) JPH02294405A (fr)
AT (1) ATE109049T1 (fr)
DE (2) DE3912298A1 (fr)
DK (1) DK0392405T3 (fr)
ES (1) ES2057239T3 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5746960A (en) * 1988-04-15 1998-05-05 Citizen Watch Co., Ltd. Method of manufacturing powder injection molded part
US5366679A (en) * 1992-05-27 1994-11-22 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for thermal debinding and sintering of a workpiece
US5401292A (en) * 1992-08-03 1995-03-28 Isp Investments Inc. Carbonyl iron power premix composition
US6280683B1 (en) 1997-10-21 2001-08-28 Hoeganaes Corporation Metallurgical compositions containing binding agent/lubricant and process for preparing same
DE69842036D1 (de) * 1997-10-21 2011-01-20 Hoeganaes Corp Verbesserte metallurgische zusammensetzungen enthaltend bindemittel/weichmacher und verfahren zu deren herstellung
DE502008000952D1 (de) * 2007-02-20 2010-08-26 Basf Se Verfahren zur herstellung von metallisierten textilen oberflächen mit strom erzeugenden oder strom verbrauchenden artikeln
CN103464759B (zh) * 2013-09-05 2015-10-21 北京科技大学 一种制备高性能复杂形状纯铁软磁产品的方法
US10022845B2 (en) 2014-01-16 2018-07-17 Milwaukee Electric Tool Corporation Tool bit
CN106735242A (zh) * 2017-01-20 2017-05-31 杭州铭赫科技有限公司 一种将草酸运用于金属注射成型过程中的方法
US11638987B2 (en) 2017-12-01 2023-05-02 Milwaukee Electric Tool Corporation Wear resistant tool bit
USD921468S1 (en) 2018-08-10 2021-06-08 Milwaukee Electric Tool Corporation Driver bit
CN111940740A (zh) * 2020-08-25 2020-11-17 兰州金浩机械制造有限公司 一种粉末冶金材料注射成型方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1483694A1 (de) * 1965-07-16 1969-02-27 Feldmuehle Ag Verfahren zum Herstellung von Formkoerpern aus Pulvern von Metallen oder Metallegierungen
EP0177772A2 (fr) * 1984-10-09 1986-04-16 International Business Machines Corporation Procédé de fabrication d'un élément composé en poudre métallique frittée

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1090014A (fr) * 1952-08-11 1955-03-25 Int Standard Electric Corp Méthodes et procédé de moulage de matériaux notamment de pièces en céramique
GB779242A (en) * 1952-08-11 1957-07-17 Standard Telephones Cables Ltd Improvements in or relating to the formation of moulded articles from sinterable materials
US4197118A (en) * 1972-06-14 1980-04-08 Parmatech Corporation Manufacture of parts from particulate material
US3989518A (en) * 1975-05-08 1976-11-02 United States Steel Corporation Production of powder metallurgical parts by formation of sintered preforms in thermally degradable molds
US4113480A (en) * 1976-12-09 1978-09-12 Cabot Corporation Method of injection molding powder metal parts
US4431449A (en) * 1977-09-26 1984-02-14 Minnesota Mining And Manufacturing Company Infiltrated molded articles of spherical non-refractory metal powders
US4404166A (en) * 1981-01-22 1983-09-13 Witec Cayman Patents, Limited Method for removing binder from a green body
DE3120501C2 (de) * 1981-05-22 1983-02-10 MTU Motoren- und Turbinen-Union München GmbH, 8000 München "Verfahren und Vorrichtung zur Herstellung von Formteilen"
US4604259A (en) * 1983-10-11 1986-08-05 Scm Corporation Process for making copper-rich metal shapes by powder metallurgy

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1483694A1 (de) * 1965-07-16 1969-02-27 Feldmuehle Ag Verfahren zum Herstellung von Formkoerpern aus Pulvern von Metallen oder Metallegierungen
EP0177772A2 (fr) * 1984-10-09 1986-04-16 International Business Machines Corporation Procédé de fabrication d'un élément composé en poudre métallique frittée

Also Published As

Publication number Publication date
EP0392405A3 (en) 1990-12-05
ATE109049T1 (de) 1994-08-15
JPH02294405A (ja) 1990-12-05
DE3912298A1 (de) 1990-10-18
DK0392405T3 (da) 1994-08-22
ES2057239T3 (es) 1994-10-16
DE59006550D1 (de) 1994-09-01
EP0392405B1 (fr) 1994-07-27
US5009841A (en) 1991-04-23

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