EP0209179A1 - Process for manufacturing a mechanically alloyed composite powder - Google Patents

Process for manufacturing a mechanically alloyed composite powder Download PDF

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Publication number
EP0209179A1
EP0209179A1 EP86201163A EP86201163A EP0209179A1 EP 0209179 A1 EP0209179 A1 EP 0209179A1 EP 86201163 A EP86201163 A EP 86201163A EP 86201163 A EP86201163 A EP 86201163A EP 0209179 A1 EP0209179 A1 EP 0209179A1
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Prior art keywords
drum
axis
grinding
powder
mill
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Granted
Application number
EP86201163A
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German (de)
French (fr)
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EP0209179B1 (en
Inventor
Manfred Dr. Rühle
Peter Prof. Dr. Wincierz
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GEA Group AG
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Metallgesellschaft AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/14—Mills in which the charge to be ground is turned over by movements of the container other than by rotating, e.g. by swinging, vibrating, tilting
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • B22F2009/041—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by mechanical alloying, e.g. blending, milling

Definitions

  • the invention relates to a method for producing a mechanically alloyed composite powder by grinding of at least one metal powder with at least one non-metallic powder or metallic powder whose components are imperfectly in the liquid state or not at all soluble in each other, in a T drum mill with high energy input in the regrind, if necessary under control of the atmospheric and / or temperature conditions.
  • the method of mechanical alloying enables the production of composite powders, the fine dispersion of a metallic or nonmetallic particles of low T eilchenabstand in a metallic matrix exist.
  • the method is used for the production of such alloys, the components of which are not sufficiently soluble in one another in the molten state and / or which are subject to undesirable oozing out during solidification.
  • metallic powder and one or more ingredients such as refractory oxide powder or other metal powder in a drum mill T with high energy input ground.
  • the powder particles are rolled out and / or crushed into thin foils by the grinding media and at the same time the thin foils are welded together again and again.
  • the solution of this problem is the use of a centrifugal mill with a cylindrical grinding drum, which rotates about its own axis and rehkir simultaneously on a rotation circle with a constant D about a fixed and the axis of the grinding drum parallel R OTA tion axis is rotated and a drive mechanism for the Rotation of the grinding drum around the drum axis and for rotation on the rotation circle of the axis of the grinding drum is provided.
  • the center of rotation lies within the cross section of the grinding vessel.
  • the M ahlgefäß itself no rotational movement leads around its own axis.
  • centrifugal mill known from DE-OS 26 31 826, which has no critical speed, uses up to 30 times the acceleration due to gravity for grinding, in contrast to the mills described above in relation to the prior art. This leads to a much higher E nerve-gie Notice in the mill and therefore a substantially smaller construction.
  • the centrifugal has been previously used for grinding mineral R ohstof- fen and other products to high fineness and specific surface areas due to the high efficiency and for F einmahlung of coal in K ohle / water or K ohle / oil suspensions.
  • the very good mixing effect due to the high effective centrifugal forces has a positive effect here.
  • D is missing a complicated sprockets and pinions, wear is correspondingly lower.
  • the degree of filling is expediently 30 to 90% with a throughput of 0.01 to 1.5 t / h.
  • the high plastic deformation is essential for the mechanically alloyed composite powders produced in the Z centrifugal mill of predominant importance, which creates the high hardness of the powder particles.
  • the composite powders can be compacted by extrusion and, if necessary, then heat-treated.

Abstract

Bei einem Verfahren zur Herstellung mechanisch legierter Verbundpulver werden wenigstens ein metallisches Pulver mit wenigstens einem nichtmetallischen Pulver in einer Trommelmühle mit hoher Energieeinbringung vermahlen. Zur Erzielung reproduzierbarer mechanisch-technologischer Eigenschaften ist vorgesehen, die Vermahlung der Pulver in einer Zentrifugalmühle mit zylinderförmiger Mahltrommel, die um ihre Achse und gleichzeitig auf einem Rotationskreis mit konstantem Drehverhältnis um eine feststehende und zu der Trommelachse parallelen Rotationsachse rotiert, durchzuführen.In a method for producing mechanically alloyed composite powders, at least one metallic powder is ground with at least one non-metallic powder in a drum mill with high energy input. In order to achieve reproducible mechanical-technological properties, it is provided that the powders are ground in a centrifugal mill with a cylindrical grinding drum which rotates around its axis and at the same time rotates on a rotating circle with a constant rotation ratio around a fixed axis of rotation parallel to the drum axis.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines mechanisch legierten Verbundpulvers durch Vermahlen von wenigstens einem metallischen Pulver mit wenigstens einem nichtmetallischen Pulver oder von metallischen Pulvern, deren Komponenten im flüssigen Zustand unvollkommen bzw. gar nicht ineinander löslich sind, in einer Trommelmühle mit hoher Energieeinbringung in das Mahlgut, ggf. unter Steuerung der atmosphärischen und/oder Temperatur-Bedingungen.The invention relates to a method for producing a mechanically alloyed composite powder by grinding of at least one metal powder with at least one non-metallic powder or metallic powder whose components are imperfectly in the liquid state or not at all soluble in each other, in a T drum mill with high energy input in the regrind, if necessary under control of the atmospheric and / or temperature conditions.

Das Verfahren des mechanischen Legierens erlaubt die Herstellung von Verbundpulvern, die aus einer Dispersion feinster metallischer oder nichtmetallischer Teilchen mit niedrigem Teilchenabstand in einer metallischen Grundmasse bestehen. Das Verfahren wird zur Herstellung solcher Legierungen benutzt, deren Komponenten im schmelzflüssigen zustand nicht hinreichend ineinander löslich sind und/oder die bei der Erstarrung einem unerwünschten Ausseigern unterliegen. Beim mechanischen Legieren werden metallische Pulver und ein oder mehrere Bestandteile, wie z.B. hochschmelzendes Oxidpulver oder ein anderes Metallpulver in einer Trommelmühle mit hoher Energieeinbringung vermahlen. Dabei werden die Pulverteilchen von den Mahlkörpern zu dünnen Folien ausgewalzt und/oder zerkleinert und gleichzeitig die dünnen Folien immer wieder miteinander verschweißt. Wegen der hohen energetischen Bedingungen stellt sich sehr schnell ein Gleichgewicht zwischen Verschweißen der Pulverteilchen und Zerkleinern ein, so daß im allgemeinen ein Verbundpulver gleichmäßiger Korngröße und sehr homogener Dispersion erzielt wird. Während der Vermahlung entstehen Verbundpulverteilchen identischer Zusammensetzung mit einem meist schichtenförmigen Aufbau, wobei die Dicke der einzelnen Schichten mit zunehmender Vermahlungsdauer immer mehr ab- und die Anzahl der Schichten je Pulverteilchen immer mehr zunimmt. Durch mechanisches Legieren lassen sich nicht nur duktile Metalle miteinander legieren, sondern auch spröde und/oder nicht-metallische Komponenten in einer feinen Verteilung in eine metallische Matrix einbringen. Die Vermahlung erfolgt in konventionellen Kugelmühlen oder in Attritoren, ggf. unter Steuerung der atmosphärischen und/ oder der Temperatur-Bedingungen. Um die gewünschte Homogenisierung des legierten Verbundpulvers zu erzielen, wird bei Einsatz einer Kugelmühle eine vergleichsweise sehr viel längere Behandlungsdauer als bei Einsatz eines Attritors benötigt. Beiden Mahlaggregaten ist jedoch gemein, daß es praktisch unmöglich ist, die mechanisch-technologischen Eigenschaften der mechanisch legierten Verbundpulverteil- chen zu reproduzieren. Darüber hinaus unterliegen die Bauteile der genannten Mahlaggregate einem nicht unbeachtlichen Verschleiß.The method of mechanical alloying enables the production of composite powders, the fine dispersion of a metallic or nonmetallic particles of low T eilchenabstand in a metallic matrix exist. The method is used for the production of such alloys, the components of which are not sufficiently soluble in one another in the molten state and / or which are subject to undesirable oozing out during solidification. During mechanical alloying metallic powder and one or more ingredients, such as refractory oxide powder or other metal powder in a drum mill T with high energy input ground. The powder particles are rolled out and / or crushed into thin foils by the grinding media and at the same time the thin foils are welded together again and again. Because of the high energetic conditions, an equilibrium between welding of the powder particles and comminution is established very quickly, so that in general a composite powder of uniform grain size and very homogeneous dispersion is achieved. During grinding, composite powder particles of identical composition with a mostly layered structure are formed, the thickness of the individual layers decreasing more and more with increasing grinding time and the number of layers per powder particle increasing more and more. Mechanical alloying not only allows ductile metals to be alloyed with one another, but also brittle and / or non-metallic components can be introduced into a metallic matrix in a fine distribution. The grinding takes place in conventional ball mills or in attritors, possibly under control of the atmospheric and / or temperature conditions. To obtain the desired homogenization to achieve the alloyed composite powder is when using a ball mill requires a comparatively much longer duration of treatment than when using an A ttritors. However, two grinding units in common that it is virtually impossible, the mechanical properties of mechanically alloyed V erbundpulverteil- reproduce chen. In addition, the components of the grinding units mentioned are subject to considerable wear.

Es ist die Aufgabe der vorliegenden Erfindung, einen Weg zu zeigen, der die Herstellung mechanisch legierter Verbundpulver in reproduzierbarer Art und Weise ermöglicht, mit dem eine kürzere Behandlungsdauer der Pulver bis zum Erreichen der gleichmäßigen Zusammensetzung des Verbundpulvers erreicht werden kann und durch den sich eine deutliche Senkung des Verschleisses der Bauteile der Mühle und der Mahlkörper erzielen läßt.It is the object of the present invention to show a way to rt the production of mechanically alloyed composite powder in a reproducible A fashion allows the shorter treatment duration of the powder may be up to reaching the uniform composition reaches the composite powder and through which clear Reduction of V erschleisses the components of the mill and the grinding media can be achieved.

Die Lösung dieser Aufgabe besteht in der Verwendung einer Zentrifugalmühle mit zylinderförmiger Mahltrommel, die um ihre eigene Achse rotiert und gleichzeitig auf einem Rotationskreis mit konstantem Drehverhältnis um eine feststehende und zu der Achse der Mahltrommel parallele Rota- tionsachse rotiert und mit einem Antriebsmechanismus für die Rotation der Mahltrommel um die Trommelachse und für die Rotation auf dem Rotationskreis der Achse der Mahltrommel versehen ist.The solution of this problem is the use of a centrifugal mill with a cylindrical grinding drum, which rotates about its own axis and rehverhältnis simultaneously on a rotation circle with a constant D about a fixed and the axis of the grinding drum parallel R OTA tion axis is rotated and a drive mechanism for the Rotation of the grinding drum around the drum axis and for rotation on the rotation circle of the axis of the grinding drum is provided.

Das Rotationszentrum liegt innerhalb des Mahlgefäßquerschnittes. Das Mahlgefäß selbst führt keine Rotationsbewegung um die eigene Achse aus.The center of rotation lies within the cross section of the grinding vessel. The M ahlgefäß itself no rotational movement leads around its own axis.

Eine solche keine kritische Drehzahl besitzende aus der DE-OS 26 31 826 bekannte zentrifugalmühle nutzt im Gegensatz zu den vorstehend zum Stand der Technik beschriebenen Mühlen das bis zu 30-fache der Erdbeschleunigung für die Mahlung aus. Dies führt zu einer wesentlich höheren Ener- giedichte in der Mühle und damit zu einer wesentlich kleineren Bauweise. Die zentrifugalmühle ist bisher eingesetzt worden für die Vermahlung von mineralischen Rohstof- fen und sonstigen Produkten auf hohe Feinheit und spezifische Oberflächen aufgrund des hohen Wirkungsgrades sowie zur Feinmahlung von Kohle in Kohle/Wasser- bzw. Kohle/öl-Suspensionen. Hier wirkt sich der sehr gute Mischeffekt aufgrund der hohen wirksamen Zentrifugalkräfte positiv aus. Da komplizierte Zahnkränze und Ritzel fehlen, ist der Verschleiß entsprechend geringer. Verglichen mit einem Attri- tor wird eine Energieeinsparung bis zu 30 % erreicht und gleichzeitig die Behandlungsdauer gegenüber Kugelmühlen um 95 % gegenüber Rührwerksattritoren um über 50 % erniedrigt. Da die Mahltrommel ihre Orientierung im Raum beibehält, ist es relativ einfach, eine direkte oder indirekte Kühlung zu realisieren.Such a centrifugal mill known from DE-OS 26 31 826, which has no critical speed, uses up to 30 times the acceleration due to gravity for grinding, in contrast to the mills described above in relation to the prior art. This leads to a much higher E nerve-giedichte in the mill and therefore a substantially smaller construction. The centrifugal has been previously used for grinding mineral R ohstof- fen and other products to high fineness and specific surface areas due to the high efficiency and for F einmahlung of coal in K ohle / water or K ohle / oil suspensions. The very good mixing effect due to the high effective centrifugal forces has a positive effect here. D is missing a complicated sprockets and pinions, wear is correspondingly lower. A ttri- compared with a gate, an energy saving is achieved up to 30% and at the same time, the treatment time with respect to ball mills by 95% compared to R ührwerksattritoren decreased by over 50%. A s grinding drum maintains its orientation in space, it is relatively easy to realize a direct or indirect cooling.

zweckmäßigerweise beträgt der Füllungsgrad 30 bis 90 % bei einer Durchsatzleistung von 0,01 bis 1,5 t/h.the degree of filling is expediently 30 to 90% with a throughput of 0.01 to 1.5 t / h.

Die Erfindung ist im folgenden anhand eines Ausführungsbeispiels näher erläutert:

  • Als Ausgangspulver wurden folgende handelsübliche Pulver eingesetzt:
    Figure imgb0001
The invention is explained in more detail below using an exemplary embodiment:
  • When A usgangspulver following commercial powder were used:
    Figure imgb0001

Als Mahlkörper wurden Stahlkugeln mit einem Gewicht von 2,5 kg und einem Durchmesser von 10 mm verwendet, die Mahlgutmenge betrug 2,0 kg. Das Volumen des Mahlgefäßes betrug 8 1. Als Frequenz des Mahlgefäßes wurden 450 U/min gewählt. Die im Deckel des Mahlgefäßes gemessene Temperatur stieg innerhalb 15 min auf 110 bis 130 °C an und blieb danach konstant. Anschließend wurde noch 15 min weitergemahlen. Nach dem Mahlen hat das Pulver gemäß der Siebanalyse eine Korngröße von 88 % unter 0,5 mm. Die Härte der Pulverpartikel betrug zwischen 782 und 888 HV. Die Schichten der einzelnen Komponenten waren so dünn, daß sie lichtmikroskopisch nicht mehr aufzulösen waren.Steel balls with a weight of 2.5 kg and a diameter of 10 mm were used as grinding media, the amount of ground material was 2.0 kg. The volume of grinding vessel was 8 1. As the frequency of the grinding vessel were 450 U / selected min. The temperature measured in the lid of the grinding vessel rose to 110 to 130 ° C. in the course of 15 minutes and then remained constant. The grinding was then continued for a further 15 minutes. After grinding, the powder has a grain size of 88% below 0.5 mm according to the sieve analysis. The hardness of the powder particles was between 782 and 888 HV. The layers of the individual components were so thin that they could no longer be resolved by light microscopy.

Für die in der Zentrifugalmühle erzeugten mechanisch legierten Verbundpulver ist die hohe plastische Verformung von vorherrschender Bedeutung, wodurch die hohe Härte der Pulverteilchen entsteht. Die Verbundpulver können durch Strangpressen verdichtet und ggf. anschließend wärmebehandelt werden.The high plastic deformation is essential for the mechanically alloyed composite powders produced in the Z centrifugal mill of predominant importance, which creates the high hardness of the powder particles. The composite powders can be compacted by extrusion and, if necessary, then heat-treated.

Claims (3)

1. Verfahren zur Herstellung eines mechanisch legierten Verbundpulvers durch Vermahlen von wenigstens einem me- tallischen Pulver mit wenigstens einem nichtmetallischen Pulver oder von metallischen Pulvern, deren Komponenten im flüssigen Zustand unvollkommen bzw. gar nicht ineinander löslich sind, in einer Trommelmühle mit hoher Energieeinbringung in das Mahlgut, ggf. unter Steuerung der atmosphärischen und/oder Temperatur-Bedingungen, dadurch gekennzeichnet, daß eine zentrifugalmühle mit zylinderförmiger Mahltrommel, die um ihre eigene Achse und gleichzeitig auf einem Rotationskreis mit konstantem Drehverhältnis um eine feststehende und zu der Trommelachse parallelen Rotationsachse rotiert und einen Antriebsmechanismus für die Rotationsmahltrommel um die Trommelachse und für die Rotation auf dem Rotationskreis der Achse der Mahltrommel aufweist, verwendet wird.1. A method for producing a mechanically alloyed composite powder by grinding of at least one metal powder with at least one non-metallic powder or metallic powder whose components are imperfectly in the liquid state or not at all soluble in each other, in a T drum mill with high energy input in the material for grinding, optionally under the control of the atmospheric and / or temperature conditions, characterized in that a centrifugal mill with a cylindrical grinding drum, which rotates about its own axis and at the same time on a R otationskreis constant rotation ratio about a fixed and the drum axis parallel the axis of rotation and having a drive mechanism for the rotary grinding drum around the drum axis and for rotation on the rotating circle of the axis of the grinding drum. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Füllungsgrad 30 bis 90 % beträgt.2. The method according to claim 1, characterized in that the degree of filling is 30 to 90%. 3. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Durchsatzleistung 0,01 bis 1,5 t/h beträgt.3. Process according to claims 1 and 2, characterized in that the throughput is 0.01 to 1.5 t / h.
EP86201163A 1985-07-13 1986-07-02 Process for manufacturing a mechanically alloyed composite powder Expired EP0209179B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853525056 DE3525056A1 (en) 1985-07-13 1985-07-13 METHOD FOR PRODUCING A MECHANICALLY ALLOYED COMPOSITE POWDER
DE3525056 1985-07-13

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EP0209179A1 true EP0209179A1 (en) 1987-01-21
EP0209179B1 EP0209179B1 (en) 1988-12-21

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EP (1) EP0209179B1 (en)
JP (1) JPS6220802A (en)
DE (2) DE3525056A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3813224A1 (en) * 1988-04-20 1988-08-25 Krupp Gmbh METHOD FOR ADJUSTING FINE CRYSTALLINE TO NANOCRISTALLINE STRUCTURES IN METAL-METAL METALOID POWDER
DE3741119A1 (en) * 1987-12-04 1989-06-15 Krupp Gmbh PRODUCTION OF SECONDARY POWDER PARTICLES WITH NANOCRISTALLINE STRUCTURE AND WITH SEALED SURFACES
DE3925973A1 (en) * 1989-08-05 1991-02-07 Eckart Standard Bronzepulver Producing aluminium-lead alloy powder - by intensively grinding together powder, of the two components
EP0510918A2 (en) * 1991-04-23 1992-10-28 Kurimoto Limited A method and apparatus for producing a hydrogen absorption alloy
DE4418598A1 (en) * 1994-05-27 1995-11-30 Fraunhofer Ges Forschung Method for producing highly disperse powder mixtures, in particular, for manufacture of components of difficult to sinter materials with intermetallic phases

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JPH0720441B2 (en) * 1988-02-10 1995-03-08 ローマン商事株式会社 Method for producing a plastic heel having a leather grain mark
DE4343106C2 (en) * 1992-12-23 1995-12-07 Deutsche Forsch Luft Raumfahrt Mechanical alloying of brittle and hard materials using planetary mills
WO2002100548A2 (en) * 2001-06-13 2002-12-19 Inhale Therapeutic Systems, Inc. Centrifuged rotating drum for treating cohesive powders
GB2511111B (en) * 2013-02-25 2015-08-19 Chinook End Stage Recycling Ltd Improvements in Waste Processing
FR3055813B1 (en) 2016-09-09 2020-06-26 H.E.F MULTIMATERIAL COMPOSITE GRAIN POWDER FOR ADDITIVE SYNTHESIS
LU101177B1 (en) 2019-04-16 2020-10-16 Delmee Maxime Functionalized metal powders by small particles made by non-thermal plasma glow discharge for additive manufacturing applications

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US2995780A (en) * 1958-12-09 1961-08-15 Int Nickel Co Treatment of metal powder
DE1151665B (en) * 1958-12-09 1963-07-18 Mond Nickel Co Ltd Process for increasing the grain size of carbonyl nickel powder, carbonyl iron powder or copper powder
US3723092A (en) * 1968-03-01 1973-03-27 Int Nickel Co Composite metal powder and production thereof

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US3529780A (en) * 1968-05-08 1970-09-22 Cecil H Wilkinson Jr Planetary grinding mill
SU814453A1 (en) * 1979-04-12 1981-03-23 Государственный Научно-Исследовательскийи Проектно-Конструкторский Институтгидрометаллургии Цветных Металлов Planetary mill

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US2995780A (en) * 1958-12-09 1961-08-15 Int Nickel Co Treatment of metal powder
DE1151665B (en) * 1958-12-09 1963-07-18 Mond Nickel Co Ltd Process for increasing the grain size of carbonyl nickel powder, carbonyl iron powder or copper powder
US3723092A (en) * 1968-03-01 1973-03-27 Int Nickel Co Composite metal powder and production thereof

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3741119A1 (en) * 1987-12-04 1989-06-15 Krupp Gmbh PRODUCTION OF SECONDARY POWDER PARTICLES WITH NANOCRISTALLINE STRUCTURE AND WITH SEALED SURFACES
DE3813224A1 (en) * 1988-04-20 1988-08-25 Krupp Gmbh METHOD FOR ADJUSTING FINE CRYSTALLINE TO NANOCRISTALLINE STRUCTURES IN METAL-METAL METALOID POWDER
DE3925973A1 (en) * 1989-08-05 1991-02-07 Eckart Standard Bronzepulver Producing aluminium-lead alloy powder - by intensively grinding together powder, of the two components
EP0510918A2 (en) * 1991-04-23 1992-10-28 Kurimoto Limited A method and apparatus for producing a hydrogen absorption alloy
EP0510918A3 (en) * 1991-04-23 1993-09-08 Kurimoto Limited A method and apparatus for producing a hydrogen absorption alloy
US6016981A (en) * 1991-04-23 2000-01-25 Kurimoto, Ltd. Apparatus for producing hydrogen adsorption alloy
DE4418598A1 (en) * 1994-05-27 1995-11-30 Fraunhofer Ges Forschung Method for producing highly disperse powder mixtures, in particular, for manufacture of components of difficult to sinter materials with intermetallic phases
DE4418598C2 (en) * 1994-05-27 1998-05-20 Fraunhofer Ges Forschung Process for producing a highly disperse powder mixture, in particular for producing components from materials that are difficult to sinter with intermetallic phases

Also Published As

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EP0209179B1 (en) 1988-12-21
DE3661463D1 (en) 1989-01-26
DE3525056A1 (en) 1987-01-22
JPS6220802A (en) 1987-01-29
US4706894A (en) 1987-11-17

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