EP0334212A2 - Method for producing moulded parts from metal powders and a sealing element produced by said method - Google Patents

Method for producing moulded parts from metal powders and a sealing element produced by said method Download PDF

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Publication number
EP0334212A2
EP0334212A2 EP89104732A EP89104732A EP0334212A2 EP 0334212 A2 EP0334212 A2 EP 0334212A2 EP 89104732 A EP89104732 A EP 89104732A EP 89104732 A EP89104732 A EP 89104732A EP 0334212 A2 EP0334212 A2 EP 0334212A2
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EP
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Prior art keywords
sintered part
pores
layered silicate
pressed
mixture
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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.)
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EP89104732A
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German (de)
French (fr)
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EP0334212A3 (en
Inventor
Hans A. Dipl.-Ing. Härle
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Schwaebische Huettenwerke Automotive GmbH
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Schwaebische Huettenwerke Automotive GmbH
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Publication of EP0334212A2 publication Critical patent/EP0334212A2/en
Publication of EP0334212A3 publication Critical patent/EP0334212A3/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/0089—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with other, not previously mentioned inorganic compounds as the main non-metallic constituent, e.g. sulfides, glass
    • 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
    • B22F3/24—After-treatment of workpieces or articles
    • B22F3/26—Impregnating

Definitions

  • the invention relates to a method for producing molded parts from metal particles by compression molding and subsequent sintering.
  • the invention also relates to a sealing element which is produced from a sintered part.
  • the production of sintered parts in powder metallurgy from metal particles, in general metal powder, has long been known.
  • the metal particles used for this purpose are pressed in the cold or warm state and then sintered. Sintering takes place in a reducing atmosphere at temperatures in the amount of 2/3 to 4/5 of the melting point of the metal particles are carried out. In this process, the metal surfaces bake together and the metal particles solidify.
  • Such a sintered part is more fine-grained and uniform than other metal particles and has higher strength properties. It is also relatively porous and has little elongation.
  • Sintered parts are used in technology in many areas, e.g. as storage materials and as metal filters for cleaning liquid metals.
  • the present invention is therefore based on the object of creating a method for producing a sintered part and a sintered part itself which has high sliding properties and high temperature resistance at the same time.
  • this object is achieved in that powdered layered silicate is also pressed into the pores of the sintered part.
  • the lubricity of the sintered part is increased even more by the lubricating effect of the graphite. Due to its insulating effect, the layered silicate takes on a protective function for graphite against excessive temperatures. The layered silicate practically envelops the graphite in the pores. The higher the desired temperature, the more mica will be used.
  • Such a sintered part can thus be used as a high-temperature-resistant sealing element, because the pores are now closed by the layered silicate or the mixture.
  • Such a use is completely surprising and runs counter to the previous knowledge and applications of sintered parts, where their porosity has just been set.
  • Layered silicates belong to a large mineral group, which also includes mica and all clay minerals. Allen is an infinitely extended, polar out as a component directed layer of SiO4 tetrahedra together, which in turn form hexagonal rings. From this group, mica in particular has proven to be the most suitable. Of course, however, other layered silicates are also possible for the purpose mentioned, if necessary.
  • the mixture is pressed into the pores under vacuum, for which purpose the sintered part is placed accordingly in a vacuum container.
  • the introduction of the mixture is facilitated and achieved in an optimal manner if the mixture is pressed into the pores via a liquid carrier medium.
  • Oil or water can serve as possible carrier media.
  • carrier media are also possible if required.
  • the mixing ratio between graphite and layered silicate depends on the application, whereby, as mentioned, only layered silicate may be used alone.
  • a mixing ratio of 50:50 is possible, as are deviations of 10, 20, 30 or 40% down and up.
  • small metal wire pieces or metal chips are pressed as metal particles instead of metal powder and sintered after molding.
  • sintered parts which are produced with the metal wire pieces according to the invention have a significantly higher elasticity and better damping behavior.
  • This method can also be used to produce parts with very low density and high material strength are put, with which a high amount of the mixture according to the invention can be introduced into the sintered part.
  • the length and diameter of the metal wire pieces depends on the application. In general, pieces of metal wire or metal shavings will be used, which have a diameter or a width of 0.1 to 2 mm and a length of approximately 0.5 to 10 mm, with deviations downwards and upwards being possible within the scope of the invention .
  • a sintered part produced according to the invention will be used as the sealing element, which can be exposed to a high temperature load.
  • the sintered part When using powder, the sintered part is compression-molded in a mold in a customary manner in a hydraulic or eccentric press and then sintered in a customary manner.
  • Graphite powder and mica powder are mixed into a solution of a calibration oil or other oily medium.
  • the sintered part is then placed in a vacuum container and then the mixture of graphite powder and mica powder is used under vacuum using the Calibration oil is pressed into the pores of the sintered part as a carrier medium.
  • the oil is then pressed out again, for example by heating.
  • the proportion of the graphite / mica powder mixture can be up to 10 or more% by weight of the sintered part. The lower the density of the sintered part and the larger the pores, the more graphite and mica powder can be introduced. This applies in particular to a sintered part which is pressed and sintered from pieces of metal wire.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)

Abstract

In a process for producing moulded parts from metal particles, pulverulent sheet silicate and optionally graphite powder are pressed into the pores of the sintered part by compression moulding and subsequent sintering. Mica can be used as the sheet silicate.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von Form­teilen aus Metallteilchen durch ein Formpressen und einem anschließenden Sintern. Außerdem betrifft die Erfindung ein Dichtungselement, das aus einem Sinterteil hergestellt ist.The invention relates to a method for producing molded parts from metal particles by compression molding and subsequent sintering. The invention also relates to a sealing element which is produced from a sintered part.

Die Herstellung von Sinterteilen in der Pulvermetallurgie aus Metallteilchen, im allgemeinen Metallpulver, ist seit langem bekannt. Die hierzu verwendeten Metallteilchen werden im kalten oder warmen Zustand formgepreßt und anschließend gesintert. Sintern wird in reduzierender Atmosphäre bei Tem­peraturen, die in Höhe von 2/3 bis 4/5 des Schmelzpunktes der Metallteilchen liegen, durchgeführt. Bei diesem Vorgang backen die Metallflächen zusammen und die Metallteilchen ver­festigen sich. Ein derartiges Sinterteil ist im Vergleich zu anderen Metallteilchen feinkörniger und gleichmäßiger und weist höhere Festigkeitseigenschaften auf. Außerdem ist es relativ porös und besitzt eine geringe Dehnung.The production of sintered parts in powder metallurgy from metal particles, in general metal powder, has long been known. The metal particles used for this purpose are pressed in the cold or warm state and then sintered. Sintering takes place in a reducing atmosphere at temperatures in the amount of 2/3 to 4/5 of the melting point of the metal particles are carried out. In this process, the metal surfaces bake together and the metal particles solidify. Such a sintered part is more fine-grained and uniform than other metal particles and has higher strength properties. It is also relatively porous and has little elongation.

In der Technik werden Sinterteile auf vielen Gebieten einge­setzt, wie z.B. als Lagerwerkstoffe und als Metallfilter zur Reinigung von Flüssigmetallen.Sintered parts are used in technology in many areas, e.g. as storage materials and as metal filters for cleaning liquid metals.

Nachteilig ist jedoch, daß deren Temperaturbeständigkeit beschränkt ist.However, it is disadvantageous that their temperature resistance is limited.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zum Herstellen eines Sinterteiles und ein Sin­terteil selbst zu schaffen, das hohe Gleiteigenschaften bei gleichzeitig hoher Temperaturbeständigkeit aufweist.The present invention is therefore based on the object of creating a method for producing a sintered part and a sintered part itself which has high sliding properties and high temperature resistance at the same time.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß in die Poren des Sinterteiles pulverförmiges Schichtsilikat mit eingepreßt wird.According to the invention, this object is achieved in that powdered layered silicate is also pressed into the pores of the sintered part.

Durch das Einpressen des Schichtsilikates in die natürlichen Poren des Sinterteiles wird zum einen eine hohe Temperatur­beständigkeit erhalten und zum anderen wird die Gleiteigen­ schaft des Sinterteiles beibehalten. Dies ist auf die hohe Temperaturbeständigkeit von Glimmer zurückzuführen.By pressing the layered silicate into the natural pores of the sintered part, a high temperature resistance is obtained on the one hand and on the other hand the sliding properties maintain the sintered part. This is due to the high temperature resistance of mica.

In einer sehr vorteilhaften Weiterbildung der Erfindung ist vorgesehen, daß in die Poren des Sinterteiles eine Mischung aus Graphitpulver und ein pulverförmiges Schichtsilikat ein­gepreßt wird.In a very advantageous development of the invention it is provided that a mixture of graphite powder and a powdered layered silicate is pressed into the pores of the sintered part.

Durch die Beimischung von Graphit wird die Gleitfähigkeit des Sinterteiles durch die Schmierwirkung des Graphites noch mehr erhöht. Das Schichtsilikat übernimmt dabei aufgrund sei­ner Isolierwirkung eine Schutzfunktion für Graphit gegen überhohe Temperaturen. Praktisch hüllt das Schichtsilikat das Graphit in den Poren ein. Je höher die gewünschte Tempe­ratur ist, desto mehr Anteil an Glimmer wird man verwenden.By adding graphite, the lubricity of the sintered part is increased even more by the lubricating effect of the graphite. Due to its insulating effect, the layered silicate takes on a protective function for graphite against excessive temperatures. The layered silicate practically envelops the graphite in the pores. The higher the desired temperature, the more mica will be used.

Damit kann man ein derartiges Sinterteil als hochtemperatur­beständiges Dichtelement verwenden, denn die Poren sind durch das Schichtsilikat bzw. die Mischung nun geschlossen. Eine derartige Verwendung ist völlig überraschend und läuft den bisherigen Erkenntnissen und Einsatzfällen von Sinter­teilen, wo man gerade deren Porösität gesetzt hat, entgegen.Such a sintered part can thus be used as a high-temperature-resistant sealing element, because the pores are now closed by the layered silicate or the mixture. Such a use is completely surprising and runs counter to the previous knowledge and applications of sintered parts, where their porosity has just been set.

Schichtsilikate gehören zu einer großen Mineralgruppe, zu welcher z.B. auch Glimmer und alle Tonminerale gehören. Al­len ist als Bauelement eine unendlich ausgedehnte, polaraus­ gerichtete Schicht von SiO₄-Tetraedern gemeinsam, welche ihrerseits hexagonale Ringe bilden. Aus dieser Gruppe hat sich insbesondere Glimmer als am besonders geeignetsten her­ausgestellt. Selbstverständlich sind jedoch im Bedarfsfalle auch noch andere Schichtsilikate für den genannten Zweck möglich.Layered silicates belong to a large mineral group, which also includes mica and all clay minerals. Allen is an infinitely extended, polar out as a component directed layer of SiO₄ tetrahedra together, which in turn form hexagonal rings. From this group, mica in particular has proven to be the most suitable. Of course, however, other layered silicates are also possible for the purpose mentioned, if necessary.

Für die Einbringung des Glimmers bzw. der Mischung in die Poren des Sinterteiles sind die verschiedenartigsten Verfah­ren möglich.Various methods are possible for introducing the mica or the mixture into the pores of the sintered part.

So kann z.B. die Mischung unter Vakuum in die Poren einge­drückt werden, wozu das Sinterteil entsprechend in einen Vakuumbehälter gelegt wird.For example, the mixture is pressed into the pores under vacuum, for which purpose the sintered part is placed accordingly in a vacuum container.

Die Einbringung der Mischung wird dabei erleichtert und auf optimale Weise erreicht, wenn die Mischung über ein flüssi­ges Trägermedium in die Poren eingepreßt wird.The introduction of the mixture is facilitated and achieved in an optimal manner if the mixture is pressed into the pores via a liquid carrier medium.

Dabei ist lediglich dafür zu sorgen, daß das Trägermedium anschließend wieder aus dem Sinterteil entfernt werden kann. Dies kann z.B. durch ein Verdunsten bei erhöhten Temperatu­ren erfolgenIt is only necessary to ensure that the carrier medium can subsequently be removed from the sintered part. This can e.g. by evaporation at elevated temperatures

Als mögliche Trägermedien können Öl oder Wasser dienen. Selbstverständlich sind hier jedoch im Rahmen der Erfindung ebenfalls bei Bedarf noch andere Trägermedien möglich.Oil or water can serve as possible carrier media. Of course here are within the scope of the invention other carrier media are also possible if required.

Das Mischungsverhältnis zwischen Graphit und Schichtsilikat richtet sich nach dem Anwendungsfall, wobei wie erwähnt ggf. auch nur Schichtsilikat alleine zur Anwendung kommt.The mixing ratio between graphite and layered silicate depends on the application, whereby, as mentioned, only layered silicate may be used alone.

So ist z.B. ein Mischungsverhältnis von 50:50 möglich, eben­so wie auch Abweichungen von 10, 20, 30 oder 40 % nach unten und oben möglich sind.For example, a mixing ratio of 50:50 is possible, as are deviations of 10, 20, 30 or 40% down and up.

Entsprechend der Dichte des zu behandelnden Sinterteiles und der Porengröße kann im Bedarfsfalle eine relativ große Menge der Mischung z.B. über 10 Gew.% in die Poren gedrückt werden.Depending on the density of the sintered part to be treated and the pore size, a relatively large amount of the mixture, e.g. over 10% by weight are pressed into the pores.

In einer Weiterbildung der Erfindung kann vorgesehen sein, daß als Metallteilchen statt Metallpulver kleine Metalldraht­stücke oder Metallspäne formgepreßt und nach dem Formen gesintert werden.In a further development of the invention it can be provided that small metal wire pieces or metal chips are pressed as metal particles instead of metal powder and sintered after molding.

Im Unterschied zu Sinterteilen, die im allgemeinen eine ge­ringe Elastizität besitzen, weisen Sinterteile, die mit den erfindungsgemäßen Metalldrahtstücken hergestellt sind, eine deutlich höhere Elastizität und ein besseres Dämpfungsverhal­ten auf. Weiterhin können mit diesem Verfahren Teile mit sehr geringer Dichte bei hoher Werkstoffestigkeit herge­ stellt werden, womit sich eine hohe Menge der erfindungs­gemäßen Mischung in das Sinterteil einbringen läßt.In contrast to sintered parts, which generally have a low elasticity, sintered parts which are produced with the metal wire pieces according to the invention have a significantly higher elasticity and better damping behavior. This method can also be used to produce parts with very low density and high material strength are put, with which a high amount of the mixture according to the invention can be introduced into the sintered part.

Länge und Durchmesser der Metalldrahtstücke richtet sich da­bei nach dem Anwendungsfall. Im allgemeinen wird man Metall­drahtstücke oder Metallspäne verwenden, die einen Durchmes­ser bzw. eine Breite von 0,1 bis 2 mm und eine Länge von ca. 0,5 bis 10 mm besitzen, wobei selbstverständlich im Rahmen der Erfindung Abweichungen nach unten und oben möglich sind.The length and diameter of the metal wire pieces depends on the application. In general, pieces of metal wire or metal shavings will be used, which have a diameter or a width of 0.1 to 2 mm and a length of approximately 0.5 to 10 mm, with deviations downwards and upwards being possible within the scope of the invention .

In vorteilhafter Weise wird man ein in erfindungsgemäßer Wei­se hergestelltes Sinterteil als Dichtungselement einsetzen, welches einer hohen Temperaturbelastung ausgesetzt werden kann.In an advantageous manner, a sintered part produced according to the invention will be used as the sealing element, which can be exposed to a high temperature load.

Nachfolgend wird beispielsweise die Herstellung eines erfindungsgemäßen Sinterteiles beschrieben.The production of a sintered part according to the invention is described below, for example.

Das Sinterteil wird bei Verwendung von Pulver in üblicher Weise in einer hydraulischen oder in einer Exzenterpresse in einer Form formgepreßt und anschließend in üblicher Weise gesintert. Graphitpulver und Glimmerpulver wird in eine Lö­sung eines Kalibrieröles oder eines anderen öligen Mediums eingemischt. Das Sinterteil wird dann in einen Vakuumbehäl­ter gelegt und anschließend wird unter Vakuum die Mischung aus Graphitpulver und Glimmerpulver unter Verwendung des Kalibrieröles als Trägermedium in die Poren des Sinterteiles eingepreßt. Anschließend wird das Öl, z.B. durch Erwärmung, wieder herausgepreßt. Der Anteil der Graphit-/Glimmerpulver­mischung kann bis zu 10 oder mehr Gew.% an dem Sinterteil betragen. Je geringer die Dichte des Sinterteiles und je größer die Poren sind, desto mehr Graphit- und Glimmerpulver kann eingebracht werden. Insbesondere gilt dies für ein Sin­terteil, das aus Metalldrahtstücken formgepreßt und gesin­tert ist.When using powder, the sintered part is compression-molded in a mold in a customary manner in a hydraulic or eccentric press and then sintered in a customary manner. Graphite powder and mica powder are mixed into a solution of a calibration oil or other oily medium. The sintered part is then placed in a vacuum container and then the mixture of graphite powder and mica powder is used under vacuum using the Calibration oil is pressed into the pores of the sintered part as a carrier medium. The oil is then pressed out again, for example by heating. The proportion of the graphite / mica powder mixture can be up to 10 or more% by weight of the sintered part. The lower the density of the sintered part and the larger the pores, the more graphite and mica powder can be introduced. This applies in particular to a sintered part which is pressed and sintered from pieces of metal wire.

Mögliche Einsatzgebiete sind sich bewegende Dichtelemente, wobei es auf eine gute Gleiteigenschaft bei einer hohen Temperaturbeständigkeit ankommt, wie z.B. Auspuffdichtringe von Verbrennungsmotoren.Possible areas of application are moving sealing elements, whereby good sliding properties and high temperature resistance are important, e.g. Exhaust sealing rings of internal combustion engines.

Claims (14)

1. Verfahren zum Herstellen von Formteilen aus Metallteil­chen durch ein Formpressen und einem anschließenden Sintern, dadurch gekennzeichnet, daß
in die Poren des Sinterteiles pulverförmiges Schichtsilikat eingepreßt wird.1. A method for producing molded parts from metal particles by compression molding and subsequent sintering, characterized in that
powdered layered silicate is pressed into the pores of the sintered part. 2. Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß
in die Poren des Sinterteils eine Mischung aus Graphitpulver und einem pulverförmigen Schichtsilikat eingepreßt wird.2. The method according to claim 1,
characterized in that
a mixture of graphite powder and a powdered layered silicate is pressed into the pores of the sintered part. 3. Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß
als Schichtsilikat Glimmer verwendet wird.3. The method according to claim 1 or 2,
characterized in that
mica is used as layered silicate. 4. Verfahren nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet, daß
das Schichtsilikat bzw. die Mischung unter Vakuum in das Sinterteil eingepreßt wird.4. The method according to claim 1, 2 or 3,
characterized in that
the layered silicate or the mixture is pressed into the sintered part under vacuum. 5. Verfahren nach einem der Ansprüche 1 - 4,
dadurch gekennzeichnet, daß
das Schichtsilikat bzw. die Mischung durch ein flüssiges Trägermedium in die Poren eingepreßt wird.5. The method according to any one of claims 1-4,
characterized in that
the layered silicate or the mixture is pressed into the pores by a liquid carrier medium. 6. Verfahren nach Anspruch 5,
dadurch gekennzeichnet, daß
als Trägermedium Öl verwendet wird.6. The method according to claim 5,
characterized in that
Oil is used as the carrier medium. 7. Verfahren nach Anspruch 5,
dadurch gekennzeichnet, daß
als Trägermedium Wasser verwendet wird.7. The method according to claim 5,
characterized in that
water is used as the carrier medium. 8. Verfahren nach Anspruch 2,
dadurch gekennzeichnet, daß
das Mischungsverhältnis 20 bis 80 % Graphitpulver und 20 bis 80 % pulverförmiges Schichtsilikat beträgt.8. The method according to claim 2,
characterized in that
the mixing ratio is 20 to 80% graphite powder and 20 to 80% powdered layered silicate. 9. Verfahren nach einem der Ansprüche 1 - 8,
dadurch gekennzeichnet, daß
die in die Poren eingebrachte Mischung bis zu 10 Gew.% des Sinterteiles beträgt.9. The method according to any one of claims 1-8,
characterized in that
the mixture introduced into the pores is up to 10% by weight of the sintered part. 10. Verfahren nach einem der Ansprüche 1 - 9,
dadurch gekennzeichnet, daß
als Metallteilchen für die Sinterung Metallpulver verwendet wird.10. The method according to any one of claims 1-9,
characterized in that
metal powder is used as metal particles for sintering. 11. Verfahren nach einem der Ansprüche 1 - 10,
dadurch gekennzeichnet, daß
als Metallteilchen kleine Metalldrahtstücke oder Metallspäne verwendet werden.11. The method according to any one of claims 1-10,
characterized in that
small metal wire pieces or metal chips can be used as metal particles. 12. Verfahren nach Anspruch 11,
dadurch gekennzeichnet, daß
Metalldrahtstücke bzw. Metallspäne verwendet werden, die einen Durchmesser bzw. eine Breite von 0,1 bis 2 mm und eine Länge von ca. 0,5 bis 10 mm besitzen.12. The method according to claim 11,
characterized in that
Metal wire pieces or metal chips are used, which have a diameter or width of 0.1 to 2 mm and a length of about 0.5 to 10 mm. 13. Aus einem Sinterteil gebildetes Dichtungselement,
dadurch gekennzeichnet, daß
in die Poren des Sinterteiles pulverförmiges Schichtsilikat eingepreßt ist.13. Sealing element formed from a sintered part,
characterized in that
powdered layered silicate is pressed into the pores of the sintered part. 14. Aus einem Sinterteil gebildetes Dichtungselement nach Anspruch 12 oder 13,
dadurch gekennzeichnet, daß
in die Poren des Sinterteiles eine Mischung aus Graphitpul­ver und einem pulverförmigen Schichtsilikat eingepreßt ist.14. A sealing element formed from a sintered part according to claim 12 or 13,
characterized in that
a mixture of graphite powder and a powdered layered silicate is pressed into the pores of the sintered part.
EP89104732A 1988-03-23 1989-03-16 Method for producing moulded parts from metal powders and a sealing element produced by said method Withdrawn EP0334212A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883809737 DE3809737A1 (en) 1988-03-23 1988-03-23 METHOD FOR PRODUCING MOLDED PARTS FROM METAL PARTICLES AND SEALING ELEMENT MADE THEREOF
DE3809737 1988-03-23

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EP0334212A2 true EP0334212A2 (en) 1989-09-27
EP0334212A3 EP0334212A3 (en) 1990-06-13

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JP (1) JPH01298102A (en)
DE (1) DE3809737A1 (en)

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EP0481763A1 (en) * 1990-10-18 1992-04-22 Hitachi Powdered Metals Co., Ltd. Sintered metal parts and their production method
WO2010074627A1 (en) * 2008-12-22 2010-07-01 Höganäs Ab (Publ) Machinability improving composition

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GB2164070A (en) * 1984-09-05 1986-03-12 Tba Industrial Products Ltd Heat settable sealant material
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DE1947963A1 (en) * 1968-09-26 1970-04-02 Allegheny Ludlum Steel Corrosion-resistant sintered metal article and method for making the same
FR2397902A1 (en) * 1977-07-20 1979-02-16 Brico Eng PROCESS FOR THE PRODUCTION OF ARTICLES BY POWDER METALLURGY AND ARTICLES THUS PRODUCED.
US4531273A (en) * 1982-08-26 1985-07-30 Worcester Controls Corporation Method for fabricating graphite filled sintered metal seats for ball valves
GB2136512A (en) * 1983-03-16 1984-09-19 Metex Corp Seal, particularly for vehicle exhaust systems
GB2164070A (en) * 1984-09-05 1986-03-12 Tba Industrial Products Ltd Heat settable sealant material
EP0266936A1 (en) * 1986-10-29 1988-05-11 Eaton Corporation Powdered metal part

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0481763A1 (en) * 1990-10-18 1992-04-22 Hitachi Powdered Metals Co., Ltd. Sintered metal parts and their production method
AU647186B2 (en) * 1990-10-18 1994-03-17 Hitachi Powdered Metals Co. Ltd. Sintered metal parts and their production method
WO2010074627A1 (en) * 2008-12-22 2010-07-01 Höganäs Ab (Publ) Machinability improving composition
CN102325614A (en) * 2008-12-22 2012-01-18 霍加纳斯股份有限公司 Machinability improving composition
US8795407B2 (en) 2008-12-22 2014-08-05 Hoganas Ab (Publ) Machinability improving composition
US9393617B2 (en) 2008-12-22 2016-07-19 Hoganas Ab (Publ) Machinability improving composition
CN106735165A (en) * 2008-12-22 2017-05-31 霍加纳斯股份有限公司 Improve the composition of machinability
CN106735165B (en) * 2008-12-22 2019-09-27 霍加纳斯股份有限公司 Improve the composition of machinability

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Publication number Publication date
DE3809737A1 (en) 1989-10-05
EP0334212A3 (en) 1990-06-13
JPH01298102A (en) 1989-12-01

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