EP0029389B1 - Procédé de fabrication de pièces de forme à partir de poudres constituées de particules métalliques sphéroidales - Google Patents

Procédé de fabrication de pièces de forme à partir de poudres constituées de particules métalliques sphéroidales Download PDF

Info

Publication number
EP0029389B1
EP0029389B1 EP80401633A EP80401633A EP0029389B1 EP 0029389 B1 EP0029389 B1 EP 0029389B1 EP 80401633 A EP80401633 A EP 80401633A EP 80401633 A EP80401633 A EP 80401633A EP 0029389 B1 EP0029389 B1 EP 0029389B1
Authority
EP
European Patent Office
Prior art keywords
compaction
powder
mixture
water
type
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
Application number
EP80401633A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0029389A1 (fr
Inventor
Yannick Bonnor
Gérard Raisson
Yves Honnorat
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.)
Creusot Loire SA
Original Assignee
Creusot Loire SA
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 Creusot Loire SA filed Critical Creusot Loire SA
Publication of EP0029389A1 publication Critical patent/EP0029389A1/fr
Application granted granted Critical
Publication of EP0029389B1 publication Critical patent/EP0029389B1/fr
Expired 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
    • 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
    • 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
    • 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
    • B22F3/12—Both compacting and sintering

Definitions

  • the invention relates to the manufacture of non-fragile shaped parts from powders consisting of spheroidal metal particles.
  • This invention makes it possible to use these powders in applications where known techniques of mechanical compaction delivered drafts that are too fragile to be handled under industrial production conditions.
  • the invention can be applied according to Belgian patent BE-A-517440, in which the cohesion is obtained by bonding by mixing before sintering the metal powder with a cellulose-based cement, such as cellulose acetate for example. In this way, a clay mass is obtained, the shaping of which takes place without significant pressure, by simple molding.
  • a powder is generally used with an irregular grain shape, characterized by a specific surface related to the large particle size.
  • the mechanical entanglement of grains in the compaction ensures sufficient mechanical strength for all the necessary manipulations of the tablet.
  • These irregularly shaped grain powders are generally obtained by the water atomization process. This process consists of spraying a jet of liquid metal with one or more jets of water under pressure. The powder is sprayed into a water bath where it finishes cooling. After decantation, the powder is dried and undergoes a first deoxidation or reduction.
  • the powder obtained has a particle size mainly below 160 micrometers.
  • the grains have a shape depending on the shade and the atomization conditions, generally quite tormented.
  • this powder must undergo a reduction step, its composition of alloying elements must be limited to those whose oxides are easily reducible.
  • the typical grade AISI 4600 contains 2% nickel and 0.8% molybdenum.
  • Chromium-manganese grades, which are less expensive, can only be produced at the cost of an expensive carbon reduction treatment at 1200 ° C. followed by grinding of the sintered powder.
  • the neutral gas atomization process makes it possible to completely overcome this problem of composition.
  • This process involves spraying a jet of liquid metal with several jets of pressurized gas.
  • the solidification of the droplets and the cooling of the powder are carried out in a confined enclosure; the atomizing gas which fills the enclosure is neutral with respect to the atomized metal.
  • the grade it can be either argon or nitrogen.
  • the device and the atomization enclosure can advantageously be designed according to the principles of the French breveis 73-43159 of December 4, 1973 or n ° 73-45788 of December 20, 1973.
  • the powder obtained has a particle size between a few microns and 500 microns , with a spheroidal grain shape.
  • the variable oxygen content depending on the grade is typically of the order of 100 to 200 ppm, and the specific surface area related to the particle size is close to the minimum value of a quasi-spherical powder.
  • the mechanical strength of the tablets depends on the interparticle contact surface produced during compaction. In practice, it is found that for a Vickers hardness under 500 g greater than 100, the mechanical strength and the resistance to crumbling of the tablets become insufficient to allow normal handling of these tablets, which severely limits the potential applications of these powders for making blanks by cold compaction.
  • the present invention makes it possible both to overcome this severe limitation and to ensure, from powder made up of spheroidal metallic particles, the production of non-fragile shaped parts having a Vickers hardness under 500 g greater than 500.
  • the principle used is the incorporation into the metal powder, by dry mixing, of an organic binder in the form of a powder of the methylcellulose type or more generally of cellulose gums which are polymers soluble in water.
  • the progressive incorporation into the mixture of an amount of water equal to that of methylcellulose, that is to say from 0.2 to 2% by weight, allows the solubilization of the methylcellulose and avoids the phenomena of demixing of the different constituents of the mixture, such as graphite powder, solid lubricant powder, etc.
  • the mixture is then ready for use and provides the tablets with mechanical strength and sufficient crumbling resistance for normal handling with compacting pressures of 25 to 75 daN / mm 2 . These properties can be increased, if necessary, by a steaming treatment at 120 ° C.
  • the elimination of this organic binder is ensured during sintering by a heat treatment under a neutral or reducing atmosphere comprising a plateau between 300 and 500 ° C., the actual sintering being carried out under the same atmosphere under the conditions of time and temperature required by the application and the shade.
  • the dosages on sintered product indicate an increase in the carbon content of less than 0.2 times the content of the initial mixture in methylcellulose and no variation in the oxygen content compared to the gas atomized powder.
  • the powder consisting of spheroidal metal particles used can advantageously be obtained by atomization of liquid metal by means of gaseous jets.
  • the cellulose gum used can advantageously be methylcellulose.
  • test pieces compacted under 75 daN / mm 2 have a flexural breaking strength of 0.200 daN / mm 2 . After baking at 120 ° C, the flexural strength increases to 0.400 daN / mm 2 . These values allow handling of the tablets without special precautions. In addition, the use of hydrolyzed methylcellulose as a compaction binder brings a spectacular improvement in the resistance to the erosion of the edges and the sufaces of the tablets.
  • the annular compaction was carried out at 40 daN / mm 2 with an industrial mechanical press.
  • the density obtained is 6.4 g / cm 3 .
  • the filling of the powder and the ejection of the blank were carried out automatically at rhythm of 400 pieces / hour.
  • the tablets produced from mixtures without hydrolyzed methylcellulose are very friable and cannot be handled, even after compression under 150 daN / mm 2 .
  • a practically complete densification of these tablets could be obtained by a heat treatment under vacuum comprising a plateau between 300 and 500 ° C. and a sintering at high temperature depending on the structure to be obtained, this temperature being able in some cases to be between 1250 ° C and 1350 ° C, for example.
  • spherical blanks were produced by cold isostatic compaction.
  • the powder is placed in latex molds and the molds placed in an enclosure where a hydraulic pressure of 2,000 to 3,500 bans is applied. Beads 8 to 30 mm in diameter were thus obtained which were sintered under the conditions indicated in Example 3.
  • the strip passes at the same speed in a passage oven under a cracked ammonia atmosphere comprising a zone at 300-500 ° C where the organic binder is eliminated and a zone at 1150 ° C where is carried out the actual sintering.
  • This strip retains a porosity of 25% by volume and can be used, for example, as a filter medium.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
EP80401633A 1979-11-14 1980-11-14 Procédé de fabrication de pièces de forme à partir de poudres constituées de particules métalliques sphéroidales Expired EP0029389B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7928066A FR2469233B1 (ja) 1979-11-14 1979-11-14
FR7928066 1979-11-14

Publications (2)

Publication Number Publication Date
EP0029389A1 EP0029389A1 (fr) 1981-05-27
EP0029389B1 true EP0029389B1 (fr) 1984-03-14

Family

ID=9231666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80401633A Expired EP0029389B1 (fr) 1979-11-14 1980-11-14 Procédé de fabrication de pièces de forme à partir de poudres constituées de particules métalliques sphéroidales

Country Status (4)

Country Link
US (1) US4391772A (ja)
EP (1) EP0029389B1 (ja)
DE (1) DE3067034D1 (ja)
FR (1) FR2469233B1 (ja)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58141306A (ja) 1982-02-12 1983-08-22 Sumitomo Metal Ind Ltd 金属粉末製造用噴霧媒
SE438275B (sv) * 1983-09-09 1985-04-15 Hoeganaes Ab Avblandningsfri jernbaserad pulverblandning
JPS60221506A (ja) * 1984-04-17 1985-11-06 Honda Motor Co Ltd 工作機械における摺動面の形成方法
US4721599A (en) * 1985-04-26 1988-01-26 Hitachi Metals, Ltd. Method for producing metal or alloy articles
US4587096A (en) * 1985-05-23 1986-05-06 Inco Alloys International, Inc. Canless method for hot working gas atomized powders
US4624706A (en) * 1985-07-02 1986-11-25 Inco Alloys International, Inc. Weld wire from extruded nickel containing powder
US4591482A (en) * 1985-08-29 1986-05-27 Gorham International, Inc. Pressure assisted sinter process
JPS6274001A (ja) * 1985-09-26 1987-04-04 Nippon Kokan Kk <Nkk> 金属焼結体の製造方法
US4830994A (en) * 1986-03-31 1989-05-16 The Dow Chemical Company Greenware binder
GB8621712D0 (en) * 1986-09-09 1986-10-15 Mixalloy Ltd Flat products
US4722826A (en) * 1986-09-15 1988-02-02 Inco Alloys International, Inc. Production of water atomized powder metallurgy products
US4955798B1 (en) * 1988-10-28 1999-03-30 Nuova Merisinter S P A Process for pretreating metal powder in preparation for compacting operations
GB9102290D0 (en) * 1991-02-02 1991-03-20 Mixalloy Ltd Production of flat products
FR2707191B1 (fr) * 1993-07-06 1995-09-01 Valinox Poudre métallique pour la réalisation de pièces par compression et frittage et procédé d'obtention de cette poudre.
US5665014A (en) * 1993-11-02 1997-09-09 Sanford; Robert A. Metal golf club head and method of manufacture
WO1998041347A1 (fr) 1997-03-19 1998-09-24 Kawasaki Steel Corporation Melange pulverise a base de fer destine a la metallurgie des poudres, dote d'excellentes caracteristiques de fluidite et d'aptitude au moulage, procede de production correspondant et procede de production d'article moule utilisant ledit melange pulverise a base de fer
SE511834C2 (sv) 1998-01-13 1999-12-06 Valtubes Sa Heltäta produkter framställda genom enaxlig höghastighetspressning av metallpulver
DE10014403A1 (de) * 2000-03-24 2001-09-27 Wolfgang Kochanek Verfahren zur Fertigung von Metallteilen
CA2534472A1 (en) * 2003-09-03 2005-03-17 Apex Advanced Technologies, Llc Composition for powder metallurgy

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE517440A (ja) *
US2598796A (en) * 1947-02-08 1952-06-03 Husqvarna Vapenfabriks Ab Methods for the reduction and sintering of bodies containing reducible metal compounds
US3725142A (en) * 1971-08-23 1973-04-03 Smith A Inland Inc Atomized steel powder having improved hardenability
GB1452510A (en) * 1973-01-05 1976-10-13 Xerox Corp Spheroidization method and apparatus
US3988524A (en) * 1973-01-15 1976-10-26 Cabot Corporation Powder metallurgy compacts and products of high performance alloys
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
CA1119847A (en) * 1977-09-26 1982-03-16 Minnesota Mining And Manufacturing Company Infiltrated molded articles of spherical non-refractory metal powders
US4298383A (en) * 1979-06-25 1981-11-03 National-Standard Company Low viscosity composition for forming shaped bodies

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Pulvermetallurgie Sinter- und Verbundwerkstoffe Seite 342-343 *

Also Published As

Publication number Publication date
US4391772A (en) 1983-07-05
EP0029389A1 (fr) 1981-05-27
DE3067034D1 (en) 1984-04-19
FR2469233A1 (ja) 1981-05-22
FR2469233B1 (ja) 1982-06-18

Similar Documents

Publication Publication Date Title
EP0029389B1 (fr) Procédé de fabrication de pièces de forme à partir de poudres constituées de particules métalliques sphéroidales
JP3884618B2 (ja) 凝集した球形金属粉を単軸圧縮する方法
RU2181317C2 (ru) Способ изготовления деталей посредством порошковой металлургии и деталь, изготовленная данным способом
KR20010079834A (ko) 강분말의 열간 압분
US4955798A (en) Process for pretreating metal in preparation for compacting operations
CN112760538B (zh) 一种钒钨合金靶坯的制备方法
FR2490975A1 (fr) Procede de production d&#39;objets en forme
JP2849710B2 (ja) チタン合金の粉末成形法
US3359095A (en) Sintering of loose particulate aluminum metal
EP0202886A1 (en) Canless method for hot working gas atomized powders
US4569822A (en) Powder metal process for preparing computer disk substrates
EP0749791A1 (fr) Procédé de mise en forme par frittage réactif de matériaux intermetalliques
WO2005068112A2 (de) Verfahren zum leichtmetall-legierungs-sintern
RU2285582C1 (ru) Способ получения антифрикционных порошковых материалов на основе меди
CA2632883C (en) Enhancement of thermal stability of porous bodies comprised of stainless steel or an alloy
JPS6043423B2 (ja) 複合組織を有する工具合金の製造方法
JPS5847444B2 (ja) 金属粉からの金属物品の製法
JP2003531961A (ja) 親水コロイドの結合剤を炭素源として用いて炭素鋼の部品を焼結させる方法
RU2090308C1 (ru) Способ получения антифрикционных порошковых материалов
JPH0762184B2 (ja) Ｔｉ合金製品の製造方法
WO2003005375A1 (fr) Procede de fabrication d&#39;un materiau combustible nucleaire composite constitue d&#39;amas d&#39; (u,pu)o2 disperses dans une matrice de uo¿2?
FR2672619A1 (fr) Materiau composite a base de tungstene et procede pour sa preparation.
JPS5852526B2 (ja) 青銅系焼結軸受材の製造法
JPS59205404A (ja) 粉末の固化方法
JP3135555B2 (ja) 高速度工具鋼の焼結体

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE GB IT SE

17P Request for examination filed

Effective date: 19810417

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): DE GB IT SE

REF Corresponds to:

Ref document number: 3067034

Country of ref document: DE

Date of ref document: 19840419

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19921103

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19921116

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19921123

Year of fee payment: 13

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19931114

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19931115

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19931114

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19940802

EUG Se: european patent has lapsed

Ref document number: 80401633.5

Effective date: 19940610