EP0710516A2 - Procédé et composé de moulage par injection pour la manufacture d'objets moulés - Google Patents

Procédé et composé de moulage par injection pour la manufacture d'objets moulés Download PDF

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Publication number
EP0710516A2
EP0710516A2 EP95115703A EP95115703A EP0710516A2 EP 0710516 A2 EP0710516 A2 EP 0710516A2 EP 95115703 A EP95115703 A EP 95115703A EP 95115703 A EP95115703 A EP 95115703A EP 0710516 A2 EP0710516 A2 EP 0710516A2
Authority
EP
European Patent Office
Prior art keywords
injection molding
powder
molding compound
metals
alloy
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
EP95115703A
Other languages
German (de)
English (en)
Other versions
EP0710516A3 (fr
EP0710516B1 (fr
Inventor
Hans Dr. Wohlfromm
Dieter Dr. Weinand
Martin Blömacher
Manfred Schwarz
Eva-Maria Langer
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
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Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of EP0710516A2 publication Critical patent/EP0710516A2/fr
Publication of EP0710516A3 publication Critical patent/EP0710516A3/fr
Application granted granted Critical
Publication of EP0710516B1 publication Critical patent/EP0710516B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • 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
    • B22F1/12—Metallic powder containing non-metallic particles
    • 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 invention relates to a process for the production of metallic moldings and to an injection molding compound which can be used for the production of such moldings.
  • metallic moldings are to be produced which contain metals sensitive to oxidation.
  • Metallic moldings can be produced by molding, debinding and sintering a compound.
  • powder injection molding an injection molding compound is injected into a metallic mold and, after molding, is debindered and sintered.
  • the injection molding compound must meet certain morphology and particle size requirements. Particles with spherical geometry show good flow properties and are therefore particularly easy to process by injection molding. Fine-particle powders are sinter-active and lead to a particularly homogeneous alloy with good mechanical properties.
  • Carbonyl metal powders that is to say powders which are produced by the carbonyl process by decomposing the corresponding metal carbonyl, are, owing to their fine particle size and their spherical particle shape, well suited for the production of metallic moldings by the injection molding process.
  • the disadvantage is that carbonyl powder is only available from a few metals are. So-called "atomized powders" which are produced by atomizing a molten metal in a gas or water jet are also suitable.
  • atomization is not possible with high-melting or reactive metals or with alloys that separate during melting. Gas atomized powders flow well because they have a spherical particle structure; atomized finished alloy powders are coarse-grained and therefore not very sinter-active.
  • the object of the invention is therefore to provide a simple method and an easy-to-produce injection molding compound for the production of metallic moldings which contain metals sensitive to oxidation.
  • high-alloy steels are to be produced that contain oxidation-sensitive metals.
  • An injection molding compound which contains at least one carbonyl metal powder and at least one element powder of metals from the group Cr, Mn, V, Si, Ti or of other metals which are at least equally sensitive to oxidation is shaped, debindered and sintered.
  • the object is also achieved by a method in which an injection molding compound which contains at least one carbonyl metal powder and at least one alloy powder is shaped, debindered and sintered.
  • the alloy powder contains at least one metal from the group Cr, Mn, V, Si, Ti or / and at least one other metal which is at least as sensitive to oxidation.
  • the use of the inexpensive carbonyl metal powder leads to a significant price advantage in terms of manufacturing costs.
  • the claimed method also allows the production of alloys, of which no alloyed powders can be produced due to their high melting point or due to separation effects occurring in the melt.
  • the carbonyl metal powders preferably have a weight fraction of the injection molding compound of at least 30%. It is further preferred to use carbonyl metal powders which are made from metals of the iron group. The use of carbonyl iron powder as carbonyl metal powder is preferred. The ratio of the average particle diameters of the carbonyl metal powder to the element and alloy powders is at most 1: 2.
  • the alloy metals preferably have a weight fraction of the metallic molded body of at least 5%. Alloy metals are those metals that have been added using element or alloy powder.
  • a sintering process in a vacuum or in a reducing protective gas atmosphere, in particular in hydrogen, hydrogen / argon or hydrogen / nitrogen, is preferred. or in an inert protective gas atmosphere, in particular in nitrogen or argon.
  • the object of the invention is also achieved by an injection molding compound, as described in the claims. It contains at least one carbonyl metal powder and at least one element powder of metals from the group Cr, Mn, V, Si, Ti or of other metals which are at least equally sensitive to oxidation.
  • the composition can also contain an alloy powder that contains at least one metal from the group Cr, Mn, V, Si, Ti or / and at least one metal that is also sensitive to oxidation.
  • the injection molding composition preferably has a carbonyl metal powder content of at least 30% by weight.
  • the injection molding composition preferably contains carbonyl metal powder of metals of the iron group, more preferably carbonyl iron powder.
  • the ratio of the average particle diameters of the carbonyl metal powder to the element and alloy powders is preferably at most 1: 2.
  • a sintered metallic molded body which is produced by molding, debinding and sintering an injection molding compound according to one of the claims relating to the injection molding compound, preferably using a method according to one of the method claims.
  • the proportion of alloy metals is preferably at least 5% by weight.
  • the moldings produced in this way have a lower surface roughness and a greater surface gloss, as a result of which the effort for mechanical reworking is significantly reduced.
  • a granulate was produced by mixing and kneading a powder mixture in a heated laboratory kneader with binder materials.
  • the powder mixture consisted of 6900 g of carbonyl iron powder with a carbon content of 0.7% by weight and an average particle size of 4 ⁇ m and 3100 g of a gas atomized master alloy of 55% by weight of Cr, 38% by weight of Ni and 7% by weight. % Mo, the average particle size in the master alloy being less than 25 ⁇ m. 952 g of polyoxymethylene and 104 g of polyethylene were used as binder materials.
  • the granules obtained were processed with a screw injection molding machine to tensile test bars with a length of 85.5 mm and a diameter of 4 mm (according to MPIF Standard 50, 1992).
  • both granules thus had a proportion of the metal powder in the total granule mass of 62% by volume.
  • All moldings were catalytically debinded at 110 ° C in a nitrogen flow of 500 l / h, which 20 ml / h concentrated HNO3 was added.
  • the samples were then placed in an electrically heated oven in dry hydrogen with a residual moisture corresponding to one Sintered dew point of -45 ° C. For this purpose, they were brought to 1360 ° C. at a heating rate of 5K / min and kept at this temperature for 1 h.
  • the density of the sintered samples was more than 7.7 g / cm 3 in both cases.
  • the light microscopic examination of the cross sections showed in both cases a uniform austenitic structure with a low residual porosity in the form of small, closed pores.
  • Tab. 1 shows the mechanical properties of the injection molded parts produced by different types of processes, as well as their carbon, nitrogen and oxygen content after sintering.
  • the relative change in length of the cylindrical injection-molded green bodies is plotted over the sintering period.
  • the associated sintering temperature results from the temperature curve T (° C) in connection with the temperature axis.
  • the length change directly indicates the compression of the injection molded parts. 1 therefore shows that the injection molded parts produced by the two different processes achieve approximately the same final density after sintering.
  • the shrinkage begins at 600 ° C.
  • the comparative samples on the other hand, only showed shrinkage at 1150 ° C.
  • Example 2 Debindered tie rods were made as described in Example 1. In contrast to Example 1, the sintering cycle was interrupted at 600 ° C or 1000 ° C. The bending strength of the cylindrical samples thus obtained was determined in a 3-point bending test with a 30 mm support. The results are shown in Table 2. Table 2 Flexural strength of injection molded samples after an interrupted sintering cycle maximum sintering temperature 600 ° C 1000 ° C made of carbonyl iron + CrNiMo master alloy 23 ⁇ 1 MPa 116 ⁇ 26 MPa made of alloyed 316L powder ⁇ 1.5 MPa 18 ⁇ 3 MPa
  • the flexural strength of the alloy produced by the process according to the invention from a carbonyl iron powder and a CrNiMo master alloy is significantly higher than that of the alloy sintered from a fully alloyed powder in the comparison process.
  • These Property is particularly advantageous for industrial production, since the injection molded parts are less sensitive to mechanical shocks. This also makes the storage of large, intricately shaped injection molded parts easier.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Chemically Coating (AREA)
EP95115703A 1994-10-07 1995-10-05 Procédé et composé de moulage par injection pour la manufacture d'objets moulés Expired - Lifetime EP0710516B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4435904 1994-10-07
DE4435904A DE4435904A1 (de) 1994-10-07 1994-10-07 Verfahren und Spritzgußmasse für die Herstellung metallischer Formkörper

Publications (3)

Publication Number Publication Date
EP0710516A2 true EP0710516A2 (fr) 1996-05-08
EP0710516A3 EP0710516A3 (fr) 1996-07-24
EP0710516B1 EP0710516B1 (fr) 1999-05-26

Family

ID=6530227

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95115703A Expired - Lifetime EP0710516B1 (fr) 1994-10-07 1995-10-05 Procédé et composé de moulage par injection pour la manufacture d'objets moulés

Country Status (5)

Country Link
US (1) US5802437A (fr)
EP (1) EP0710516B1 (fr)
JP (1) JP3980084B2 (fr)
DE (2) DE4435904A1 (fr)
ES (1) ES2131736T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001081467A1 (fr) * 2000-04-19 2001-11-01 Basf Aktiengesellschaft Liant pour materiau pulverulent inorganique destine a la production de pieces moulees metalliques et ceramiques

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2955754B1 (ja) * 1998-06-01 1999-10-04 有限会社モールドリサーチ 金属粉末の射出成形用組成物と、その組成物を用いた射出成形及び焼結法
WO2000065170A1 (fr) * 1999-04-27 2000-11-02 Bbr Systems Ltd. Procede et dispositif d'ancrage de torons, et procede de production de coins d'ancrage
SE520251C2 (sv) * 1999-05-20 2003-06-17 Sandvik Ab Motståndselement av molybdensilicidtyp för sintring av metallpulver
DE10218002B4 (de) * 2002-04-23 2006-09-07 Ims Connector Systems Gmbh Verfahren zur Herstellung eines Steckverbindergehäuse sowie Steckverbindergehäuse
WO2004039522A1 (fr) * 2002-10-29 2004-05-13 Basf Aktiengesellschaft Masse de moulage par injection de poudre metallique et procede de moulage par injection de poudre metallique
US9827690B2 (en) * 2012-11-30 2017-11-28 Nv Bekaert Sa Sleeve for a sawing bead obtained by metal injection moulding
CN104325141B (zh) * 2014-10-23 2016-11-30 李烈熊 一种粉末冶金材料注射成型方法
CN110405214B (zh) * 2019-08-26 2021-11-05 怡力精密制造有限公司 不锈钢材料的制备方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0356131A1 (fr) * 1988-08-20 1990-02-28 Kawasaki Steel Corporation Pièces frittées et leur procédé de fabrication
EP0421811A1 (fr) * 1989-10-06 1991-04-10 Sumitomo Metal Mining Company Limited Alliage d'acier pour articles frittés moulés par injection, produits par métallurgie des poudres
DE4305201C1 (de) * 1993-02-19 1994-04-07 Eos Electro Optical Syst Verfahren zum Herstellen eines dreidimensionalen Objekts

Family Cites Families (12)

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JPH01290704A (ja) * 1988-05-16 1989-11-22 Daido Steel Co Ltd 焼結用磁性粉末混練物
WO1989012112A1 (fr) * 1988-05-30 1989-12-14 Kawasaki Steel Corporation MATERIAU MAGNETIQUE FRITTE A BASE DE Fe-Co ET PROCEDE DE PRODUCTION DE CE MATERIAU
JPH0647684B2 (ja) * 1989-01-20 1994-06-22 川崎製鉄株式会社 射出成形体の脱脂方法
US5278250A (en) * 1989-11-04 1994-01-11 Del-Ichi Ceramo Co., Limited Process for preparing organic binder
JPH0711012B2 (ja) * 1990-02-06 1995-02-08 三洋化成工業株式会社 成形用組成物および焼結体の製造方法
GB2243160B (en) * 1990-02-13 1994-08-10 Honda Motor Co Ltd A method of producing a moulded article
US5292485A (en) * 1990-04-03 1994-03-08 Ngk Insulators, Ltd. Heat-resistant metal monolith
US5427601A (en) * 1990-11-29 1995-06-27 Ngk Insulators, Ltd. Sintered metal bodies and manufacturing method therefor
US5328657A (en) * 1992-02-26 1994-07-12 Drexel University Method of molding metal particles
EP0561343B1 (fr) * 1992-03-16 1997-01-08 Kawasaki Steel Corporation Système liant et son utilisation dans le moulage et par injection des poudres frittables et composition contenant ce système
US5401292A (en) * 1992-08-03 1995-03-28 Isp Investments Inc. Carbonyl iron power premix composition
US5512080A (en) * 1992-11-27 1996-04-30 Toyota Jidosha Kabushiki Kaisha Fe-based alloy powder adapted for sintering, Fe-based sintered alloy having wear resistance, and process for producing the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0356131A1 (fr) * 1988-08-20 1990-02-28 Kawasaki Steel Corporation Pièces frittées et leur procédé de fabrication
EP0421811A1 (fr) * 1989-10-06 1991-04-10 Sumitomo Metal Mining Company Limited Alliage d'acier pour articles frittés moulés par injection, produits par métallurgie des poudres
DE4305201C1 (de) * 1993-02-19 1994-04-07 Eos Electro Optical Syst Verfahren zum Herstellen eines dreidimensionalen Objekts

Non-Patent Citations (3)

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DATABASE WPI Section Ch, Week 9002 Derwent Publications Ltd., London, GB; Class L03, AN 90-011078 XP002002654 & JP-A-01 290 704 (DAIDO TOKUSHOKO KK) , 22.November 1989 *
KLAR, E.: "Metals Handbook, 9th Edition, Vol.7 Powder Metallurgy" 1982 , AMERICAN SOCIETY FOR METALS , OHIO, USA XP002002653 * Seite 495 - Seite 500 * *
LALL, CHAMAN: "Soft Magnetism - Fundamentals for Powder Metallurgy and Metal Injection Molding" 1992 , METAL POWDER INDUSTRIES FEDERATION , PRINCETON, NEW JERSEY, USA XP002002652 * Seite 43, vorletzter Absatz * * Seite 40 - Seite 45 * *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001081467A1 (fr) * 2000-04-19 2001-11-01 Basf Aktiengesellschaft Liant pour materiau pulverulent inorganique destine a la production de pieces moulees metalliques et ceramiques

Also Published As

Publication number Publication date
EP0710516A3 (fr) 1996-07-24
DE59506018D1 (de) 1999-07-01
JP3980084B2 (ja) 2007-09-19
DE4435904A1 (de) 1996-04-11
EP0710516B1 (fr) 1999-05-26
US5802437A (en) 1998-09-01
JPH08209204A (ja) 1996-08-13
ES2131736T3 (es) 1999-08-01

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