EP0710516B1 - Verfahren und Spritzgussmasse für die Herstellung metallischer Formkörper - Google Patents

Verfahren und Spritzgussmasse für die Herstellung metallischer Formkörper Download PDF

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Publication number
EP0710516B1
EP0710516B1 EP95115703A EP95115703A EP0710516B1 EP 0710516 B1 EP0710516 B1 EP 0710516B1 EP 95115703 A EP95115703 A EP 95115703A EP 95115703 A EP95115703 A EP 95115703A EP 0710516 B1 EP0710516 B1 EP 0710516B1
Authority
EP
European Patent Office
Prior art keywords
powder
injection
alloy
molding composition
carbonyl
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
EP95115703A
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German (de)
English (en)
French (fr)
Other versions
EP0710516A3 (de
EP0710516A2 (de
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
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 EP0710516A2 publication Critical patent/EP0710516A2/de
Publication of EP0710516A3 publication Critical patent/EP0710516A3/de
Application granted granted Critical
Publication of EP0710516B1 publication Critical patent/EP0710516B1/de
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 method for producing metallic Molded body and on an injection molding compound, which are used for the production such moldings can be used.
  • metallic Shaped bodies are made, the oxidation-sensitive metals contain.
  • Metallic moldings can be formed by molding, debinding and sintering of a compound.
  • Powder injection molding is one Injection molding compound injected into a metallic mold and after molding debinded and sintered.
  • the injection molding compound must determine Morphology and particle size requirements are sufficient. Particles with spherical geometry show good flow properties and are therefore in Injection molding process to process particularly well. Fine powder are sinter-active and lead to a particularly homogeneous alloy good mechanical properties.
  • Carbonyl metal powder i.e. powder that is produced by the carbonyl process
  • Decomposition of the corresponding metal carbonyl are suitable look good due to their fine particle size and spherical particle shape for the production of metallic moldings by injection molding.
  • the disadvantage is that carbonyl powder is only available from a few metals
  • the atomization is, however, in the case of refractory or reactive metals or with alloys. which separate during melting, not possible. Gas atomized powders flow well because they have a spherical particle structure; atomized finished alloy powders are coarse-grained and therefore little sinter active.
  • EP-A-0 421 811 relates to an alloy steel for use in injection molded Sintered molded body. It becomes a mother alloy made of an Fe-Cr alloy or one Fe-Mn alloy mixed with carbonyl iron powder, injection molded and debindered sintered. An iron alloy of another metal is thus used.
  • iron alloys are not combined with any other Metal used as alloy powder.
  • JP-A-1 290 704 relates to a magnetic powder mixture which is suitable for sintering.
  • the powder mixture with a binding agent can be injection molded.
  • the steel alloy powder came aluminum, nickel, chromium, molybdenum or cobalt.
  • EP-A-0 356 131 relates to sintered bodies and production processes therefor.
  • For the production are made of titanium powder or atomized iron-silicon powder or a mixture Carbonyl iron powder and ground iron 44% silicon powder used.
  • the object of the invention is therefore a simple method and easy to produce injection molding compound for the production of metallic To provide moldings that contain oxidation-sensitive metals.
  • high-alloy steels are to be manufactured that are sensitive to oxidation Contain metals.
  • This task is accomplished by the following procedures. Doing so Injection molding compound, the at least one carbonyl metal powder and at least one Contains element powder of metals from the group Cr, Mn, V or Ti, shaped, debindered and sintered. The task is also through a procedure solved in which an injection molding compound containing at least one carbonyl metal powder and contains at least one alloy powder, molded, debindered and is sintered.
  • the alloy powder contains at least one metal the group Cr, Mn, V, Si, Ti or / and at least one other metal, the is at least as sensitive to oxidation, but is free of iron.
  • the Use of the inexpensive carbonyl metal powder leads to a significant price advantage in manufacturing costs.
  • the procedures allow also the production of alloys, of which because of their high Melting point or due to separation effects occurring in the melt no alloy powders can be produced.
  • the carbonyl metal powders preferably have a proportion by weight of the Injection molding compound of at least 30%. Use is further preferred of carbonyl metal powders made from metals of the iron group are. The use of carbonyl iron powder as carbonyl metal powder is preferred. The ratio of the mean particle diameters is preferably the carbonyl metal powder to the element and alloy powders at most 1: 2. The alloy metals preferably have one Weight fraction of the metallic molded body of at least 5%. Alloy metals are those metals that use element or alloy powder were added. A sintering process in vacuum is preferred or in a reducing protective gas atmosphere, especially in hydrogen, Hydrogen / argon or hydrogen / nitrogen, or in an inert protective gas atmosphere, especially in nitrogen or argon.
  • An injection molding compound contains at least one carbonyl metal powder and at least one an element powder of metals from the group Cr, Mn, V or Ti instead of an element powder, the mass can also contain an alloy powder, the at least one metal from the group Cr, Mn, V, Si, Ti or / and contains at least one metal that is also sensitive to oxidation, however is free of iron.
  • the injection molding compound preferably has a proportion of carbonyl metal powders of at least 30% by weight.
  • the injection molding compound preferably contains Carbenyl metal powder of metals of the iron group, more preferably carbonyl iron powder.
  • the ratio of the average particle diameter of the carbonyl metal powder to the element and alloy powders is preferably at most 1: 2.
  • Sintered metallic moldings can be formed, debinding and Sintering of such an injection molding compound can be produced.
  • the proportion of alloy metals is at least 5% by weight.
  • the moldings produced in this way have lower surface roughness and a greater surface gloss, which reduces the effort for mechanical Postprocessing drops significantly.
  • shaped bodies made of AISI type stainless steel 316L granules were made by mixing a powder mixture in a heated laboratory kneader mixed with binder materials and was kneaded.
  • the powder mixture consisted of 6900 g carbonyl iron powder with a Carbon content of 0.7 wt .-% and an average particle size of 4 ⁇ m and 3100 g of a gas atomized master alloy of 55% by weight Cr, 38% by weight of Ni and 7% by weight of Mo, the average particle size in the master alloy was less than 25 ⁇ m. 952 g were used as binder materials Polyoxymethylene and 104 g of polyethylene are used.
  • the granules obtained were added using a screw injection molding machine Tensile test bars with 85.5 mm length and 4 mm diameter processed (according to MPIF Standard 50, 1992).
  • All moldings were catalytically debinded at 110 ° C. in a nitrogen stream of 500 l / h, to which 20 ml / h concentrated HNO 3 was added.
  • the samples were then sintered in an electrically heated oven in dry hydrogen with a residual moisture content corresponding to a 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.
  • Fig. 1 shows a comparison of the shrinkage behavior according to the alloys produced by various processes. For this, the debindered green castings are sintered in a dilatometer.
  • the relative change in length of the cylindrical injection molded green bodies is applied over the sintering period.
  • the associated sintering temperature results from the temperature curve T (° C) in connection with the Temperature axis.
  • 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.
  • the flexural strength of the according to the invention Process from a carbonyl iron powder and a CrNiMo master alloy Alloy produced is significantly higher than that in the comparison process from a pre-alloyed powder sintered alloy.
  • This Property is particularly advantageous for industrial manufacturing because the Injection molded parts less sensitive to mechanical shocks are. This also makes the storage of large, more complex shapes 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 Verfahren und Spritzgussmasse für die Herstellung metallischer Formkörper Expired - Lifetime EP0710516B1 (de)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=6530227

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95115703A Expired - Lifetime EP0710516B1 (de) 1994-10-07 1995-10-05 Verfahren und Spritzgussmasse für die Herstellung metallischer Formkörper

Country Status (5)

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

Families Citing this family (9)

* 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
AU3319700A (en) * 1999-04-27 2000-11-10 Bbr Systems Ltd. Method and device for anchoring strands and method for producing clamping wedges
SE520251C2 (sv) * 1999-05-20 2003-06-17 Sandvik Ab Motståndselement av molybdensilicidtyp för sintring av metallpulver
DE10019447A1 (de) * 2000-04-19 2001-10-25 Basf Ag Bindemittel für anorganische Materialpulver zur Herstellung metallischer und keramischer Formkörper
DE10218002B4 (de) * 2002-04-23 2006-09-07 Ims Connector Systems Gmbh Verfahren zur Herstellung eines Steckverbindergehäuse sowie Steckverbindergehäuse
AU2003278115A1 (en) * 2002-10-29 2004-05-25 Basf Aktiengesellschaft Metal powder injection molding material and metal powder injection molding method
WO2014082870A1 (en) * 2012-11-30 2014-06-05 Nv Bekaert Sa A 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

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01290704A (ja) * 1988-05-16 1989-11-22 Daido Steel Co Ltd 焼結用磁性粉末混練物
US5055128A (en) * 1988-05-30 1991-10-08 Kawasaki Steel Corporation Sintered fe-co type magnetic materials
US4964907A (en) * 1988-08-20 1990-10-23 Kawasaki Steel Corp. Sintered bodies and production process thereof
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
DE69024582T2 (de) * 1989-10-06 1996-05-15 Sumitomo Metal Mining Co Stahllegierung zum Anwenden in spritzgegossenen pulvermetallurgisch hergestellten gesinterten Formkörpern
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 (en) * 1992-03-16 1997-01-08 Kawasaki Steel Corporation Binder system for use in the injection molding of sinterable powders and molding compound containing the binder system
US5401292A (en) * 1992-08-03 1995-03-28 Isp Investments Inc. Carbonyl iron power premix composition
EP0604773B2 (en) * 1992-11-27 2000-08-30 Toyota Jidosha Kabushiki Kaisha Fe-based alloy powder adapted for sintering, Fe-based sintered alloy having wear resistance, and process for producing the same
DE4305201C1 (de) * 1993-02-19 1994-04-07 Eos Electro Optical Syst Verfahren zum Herstellen eines dreidimensionalen Objekts

Also Published As

Publication number Publication date
US5802437A (en) 1998-09-01
JPH08209204A (ja) 1996-08-13
EP0710516A3 (de) 1996-07-24
JP3980084B2 (ja) 2007-09-19
DE59506018D1 (de) 1999-07-01
EP0710516A2 (de) 1996-05-08
ES2131736T3 (es) 1999-08-01
DE4435904A1 (de) 1996-04-11

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