EP0039014A1 - Method of manufacturing compacts from powder - Google Patents
Method of manufacturing compacts from powder Download PDFInfo
- Publication number
- EP0039014A1 EP0039014A1 EP81102953A EP81102953A EP0039014A1 EP 0039014 A1 EP0039014 A1 EP 0039014A1 EP 81102953 A EP81102953 A EP 81102953A EP 81102953 A EP81102953 A EP 81102953A EP 0039014 A1 EP0039014 A1 EP 0039014A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- capsule
- powder
- pressure
- temperature
- shape
- 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
Links
- 239000000843 powder Substances 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 239000002775 capsule Substances 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 13
- 239000007787 solid Substances 0.000 claims abstract description 4
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 claims abstract 2
- 239000002184 metal Substances 0.000 claims description 3
- 229910052903 pyrophyllite Inorganic materials 0.000 claims description 3
- 229910052623 talc Inorganic materials 0.000 claims description 3
- 239000000454 talc Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 229910000997 High-speed steel Inorganic materials 0.000 claims 1
- 239000007858 starting material Substances 0.000 abstract description 2
- 239000011810 insulating material Substances 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 description 3
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 235000012222 talc Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 239000011345 viscous material Substances 0.000 description 1
Images
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
- 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
- B22F3/1208—Containers or coating used therefor
- B22F3/1216—Container composition
- B22F3/1241—Container composition layered
-
- 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
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
Definitions
- the invention relates to a method for producing pressed articles from powder according to the preamble of claim 1.
- European patent application 80 100 788.1 describes a process for the production of metallic compacts in which the starting material is a metal powder.
- powder is enclosed in a capsule, the capsule is heated with the powder, the capsule is inserted into the pressure chamber of a press and surrounded with a layer of an easily deformable, thermally stable powder with a layer structure of powder grains which easily slide against one another and with good heat-insulating properties.
- a piston is inserted into the pressure chamber and compresses the powder and binds the powder grains to one another, so that a homogeneous body is obtained whose density is completely or approximately equal to the theoretical maximum density.
- the easily deformable powder is preferably talc, but another material with similar properties, such as pyrophyllite, can also be used.
- the finished pressed compacts are further processed into workpieces, the shape and size of which differ from the * shape and size of the compact.
- the known method is not suitable for manufacturing Position of compacts, the shape and size of which almost matches the shape and size of the finished workpiece.
- the invention has for its object to develop a method of the type mentioned, with which compacts can be produced, the shape and size of which largely corresponds to a workpiece of complicated shape, so that only a small amount of processing of the compact is required in order to to get the final shape and dimensions of the finished workpiece.
- the powder is enclosed in a first capsule, which has the same shape as the finished product, but is slightly larger.
- the powder is degassed and the capsule is closed.
- This first capsule is placed approximately in the middle of a second, larger capsule.
- This second capsule can have a simple shape.
- the space between the two capsules is filled with an agent that is viscous at the pressing temperature.
- the second capsule with its contents is heated to a temperature at which the powder grains are bound together under pressure, whereupon they are placed in the pressure chamber of a press and surrounded by an easily deformable material such as talc or pyrophyllite.
- a piston is then inserted into the pressure chamber, which pressurizes the contents of the pressure chamber.
- the material that complicates the first capsule The shape surrounding it is so viscous that it exerts all-round isostatic pressure on the capsule and compresses it without significantly changing its proportions. Under the combined effect of this compression and the high temperature, the powder bodies are bound together so that a solid body is formed.
- the material between the two capsules can be a salt, a metal or a type of glass, the melting or softening temperature of this material being far below the pressing temperature used.
- the compression pressure is usually above 1 kbar, preferably between 3 and 10 kbar.
- the pressing temperature depends on the material. Suitable molding temperatures are for steel (S c hnellstahl) 1050-1100 ° C, for superalloys 1100-1250 ° C, for ceramic material from 1000 to 1700 ° C and for carbide 1400-1500 ° C.
- S c hnellstahl steel
- superalloys 1100-1250 ° C for ceramic material from 1000 to 1700 ° C and for carbide 1400-1500 ° C.
- a high temperature results in a high density even at relatively low pressure and a short pressing time. If the powder temperature is lowered, the same high density can be obtained by increasing the pressure and / or the pressing time. Below a certain temperature it is no longer possible to achieve a bond and a
- the viscous material between the two capsules also acts as a heat accumulator that surrounds the inner capsule and delays its cooling. This prevents small and protruding parts with large areas from being cooled in terms of their volume in relation to the enclosed powder volume. These parts therefore maintain the binding temperature for a long time so that pressure can be applied as long as the conditions for binding are met. It is therefore possible to press workpieces with very thin, outstanding parts.
- 1 denotes a press table and 2 a movable piston of a press, which is otherwise not shown.
- a press cylinder 3 with a loose inner bottom 4 is placed on the press table.
- This inner capsule 5 is placed in the middle of an outer capsule 7, and is surrounded on all sides by a means 8 which is so viscous at the pressing temperature that it essentially behaves like a liquid and thereby exerts pressure on the inner capsule 5 from all sides exercises and compresses the powder enclosed in the capsule without significantly changing the shape of the capsule 5.
- the outer capsule 7 is placed in the pressure chamber 9, which is formed from the press cylinder 3, the bottom 4 and the piston 2.
- the outer capsule 7 is surrounded on all sides with a layer of talcum powder 10.
- pressure is applied to the talcum powder 10.
- Talc powder does not have ideal properties as a pressure-transmitting agent, since it would change the shape of a capsule embedded in it to a certain extent. This imperfection is a major disadvantage when a workpiece of complex shape is to be pressed into almost its final shape and dimensions.
- the viscous agent 8 the capsule 5 is exposed to all-round pressure, so that no or only an insignificant change in shape occurs during pressing.
- the material 8 can be one which is powdery at room temperature or which consists of blocks pressed or cast from powder, which together form a cavity adapted to the capsule 5. If the material 8 takes on its viscous properties when heated; there is a risk that the capsule 5 descends or rises. To prevent this, 7 supports can be fitted between the inner capsule 5 and the outer capsule.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
Verfahren zur Herstellung eines Preßlings aus einem Pulver als Ausgangsmaterial, wobei der fertiggepreßte Preßling nahezu die endgültige Form und Größe eines herzustellenden Werkstückes komplizierter Form hat. Das Pulver (6) wird in einer ersten (inneren) Kapsel (5) plaziert, welche die Form des gewünschten Preßlings hat und deren Größe der Volumenverminderung des Pulvers beim Pressen zu einem dichten Körper angepaßt ist. Die erste Kapsel (5) wird in einer zweiten größeren Kapsel (7) placiert und wird in dieser von allen Seiten mit einem Material (8) umgeben, das bei der Preßtemperatur viskos ist. Die zweite, äußere Kapsel (7) wird mit ihrem Inhalt erhitzt und anschließend in den Druckraum (9) einer Presse eingesetzt, wobei sie in dem Druckraum von einem leicht verformbaren, wärmeisolierenden Material (10), wie z.B. Talk, umgeben ist. Ein Kolben (2) wird in den Druckraum (9) eingeführt und übt auf den Inhalt einen Druck aus, bei dem das Material in der ersten Kapsel (5) zu einem homogenen festen Körper verdichtet wird.Process for the production of a compact from a powder as a starting material, the finished compact having almost the final shape and size of a workpiece to be produced of a complicated shape. The powder (6) is placed in a first (inner) capsule (5), which has the shape of the desired compact and the size of which is adapted to the volume reduction of the powder when pressed into a dense body. The first capsule (5) is placed in a second larger capsule (7) and is surrounded on all sides by a material (8) which is viscous at the pressing temperature. The contents of the second, outer capsule (7) are heated and then inserted into the pressure chamber (9) of a press, where they are made of an easily deformable, heat-insulating material (10), e.g. Talk, is surrounded. A piston (2) is inserted into the pressure chamber (9) and exerts a pressure on the contents, in which the material in the first capsule (5) is compressed into a homogeneous solid body.
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Preßlingen aus Pulver gemäß dem Oberbegriff des Anspruches 1.The invention relates to a method for producing pressed articles from powder according to the preamble of
In der europäischen Patentanmeldung 80 100 788.1 wird ein Verfahren zur Herstellung von metallischen Preßlingen beschrieben, bei dem das Ausgangsmaterial ein Metallpulver ist. Gemäß diesem Verfahren wird Pulver in eine Kapsel eingeschlossen, die Kapsel mit dem Pulver erhitzt, die Kapsel in den Druckraum einer Presse eingesetzt und mit einer Schicht aus einem leichtverformbaren, thermisch stabilen Pulver mit einer Schichtstruktur von leicht aneinandergleitenden Pulverkörnern und mit guten wärmeisolierenden Eigenschaften umgeben. Ein Kolben wird in den Druckraum eingeführt und bewirkt das Zusammenpressen des Pulvers sowie eine Bindung der Pulverkörner untereinander, so daß man einen homogenen Körper erhält, dessen Dichte völlig oder annähernd gleich der theoretischen maximalen Dichte ist. Mit Rücksicht auf den Preis und die Verfügbarkeit besteht das leichtverformbare Pulver vorzugsweise aus Talk, doch kann auch ein anderes Material mit ähnlichen Eigenschaften, wie beispielsweise Pyrophyllit, verwendet werden. Die fertiggepreßten Preßlinge werden dabei zu Werkstücken weiterverarbeitet, deren Form und Größe von der*Form und Größe des Preßlings verschieden ist. Das bekannte Verfahren eignet sich nicht zur HerStellung von Preßlingen, deren Form und Größe nahezu mit der Form und Größe des fertigen Werkstückes übereinstimmt.European patent application 80 100 788.1 describes a process for the production of metallic compacts in which the starting material is a metal powder. According to this method, powder is enclosed in a capsule, the capsule is heated with the powder, the capsule is inserted into the pressure chamber of a press and surrounded with a layer of an easily deformable, thermally stable powder with a layer structure of powder grains which easily slide against one another and with good heat-insulating properties. A piston is inserted into the pressure chamber and compresses the powder and binds the powder grains to one another, so that a homogeneous body is obtained whose density is completely or approximately equal to the theoretical maximum density. In view of price and availability, the easily deformable powder is preferably talc, but another material with similar properties, such as pyrophyllite, can also be used. The finished pressed compacts are further processed into workpieces, the shape and size of which differ from the * shape and size of the compact. The known method is not suitable for manufacturing Position of compacts, the shape and size of which almost matches the shape and size of the finished workpiece.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art zu entwickeln, mit dem Preßlinge hergestellt werden können, deren Form und Größe bereits weitgehend mit einem Werkstück komplizierter Form übereinstimmt, so daß nur noch eine geringe Bearbeitung des Preßlings erforderlich ist, um die endgültien ge Form und die endgültigen Abmessungfdes fertigen Werkstücks zu erhalten.The invention has for its object to develop a method of the type mentioned, with which compacts can be produced, the shape and size of which largely corresponds to a workpiece of complicated shape, so that only a small amount of processing of the compact is required in order to to get the final shape and dimensions of the finished workpiece.
Zur Lösung dieser Aufgabe wird ein Verfahren nach dem Oberbegriff des Anspruches 1 vorgeschlagen, welches erfindungsgemäß die im kennzeichnenden Teil des Anspruches 1 genannten Merkmale hat.To achieve this object, a method is proposed according to the preamble of
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen genannt.Advantageous developments of the invention are mentioned in the subclaims.
Gemäß der Erfindung wird das Pulver in eine erste Kapsel eingeschlossen, welche dieselbe Form wie das fertige Produkt hat, jedoch etwas größer ist. Das Pulver wird entgast und die Kapsel wird verschlossen. Diese erste Kapsel wird etwa in der Mitte einer zweiten, größeren Kapsel placiert. Diese zweite Kapsel kann eine einfache Form haben. Der Raum zwischen den beiden Kapseln wird mit einem Mittel gefüllt, das bei der Preßtemperatur viskos ist. Die zweite Kapsel mit ihrem Inhalt wird auf eine Temperatur erhitzt, bei welcher die Pulverkörner unter Druck aneinandergebunden werden, worauf sie in dem Druckraum einer Presse placiert und von einem leichtverformbaren Material, wie Talk oder PyrophyIlit, umgeben wird. Anschließend wird ein Kolben in die Druckkammer eingeführt, der den Inhalt der Druckkammer unter Druck setzt. Das Material, das die erste Kapsel mit komplizierter Form umgibt, ist so viskos, daß es einen allseitigen isostatischen Druck auf die Kapsel ausübt und diese verdichtet, ohne ihre Proportionen nennenswert zu verändern. Unter der gemeinsamen Wirkung dieser Verdichtung und der hohen Temperatur werden die Pulverkörper aneinandergebunden, so daß ein massiver Körper gebildet wird.According to the invention, the powder is enclosed in a first capsule, which has the same shape as the finished product, but is slightly larger. The powder is degassed and the capsule is closed. This first capsule is placed approximately in the middle of a second, larger capsule. This second capsule can have a simple shape. The space between the two capsules is filled with an agent that is viscous at the pressing temperature. The second capsule with its contents is heated to a temperature at which the powder grains are bound together under pressure, whereupon they are placed in the pressure chamber of a press and surrounded by an easily deformable material such as talc or pyrophyllite. A piston is then inserted into the pressure chamber, which pressurizes the contents of the pressure chamber. The material that complicates the first capsule The shape surrounding it is so viscous that it exerts all-round isostatic pressure on the capsule and compresses it without significantly changing its proportions. Under the combined effect of this compression and the high temperature, the powder bodies are bound together so that a solid body is formed.
Das Material zwischen den beiden Kapsel kann ein Salz, ein Metall oder eine Glassorte sein, wobei die Schmelz-oder Erweichungstemperatur dieses Materials weit unterhalb der verwendeten Preßtemperatur liegt. Der Preßdruck liegt in der Regel über 1 kBar, vorzugsweise zwischen 3 und 10 kBar. Die Preßtemperatur ist materialabhängig. Geeignete Preßtemperaturen sind für Stahl (Schnellstahl) 1050 - 1100°C, für Superlegierungen 1100 - 1250°C, für keramisches Material 1000 - 1700°C und für Hartmetall 1400 - 1500°C. Eine hohe Temperatur bewirkt eine hohe Dichte bereits bei relativ niedrigem Druck und eine kurze Preßzeit. Wird die Pulvertemperatur gesenkt, so kann man dieselbe hohe Dichte erhalten, indem der Druck und/oder die Preßzeit erhöht werden. Unterhalb einer bestimmten Temperatur ist es nicht mehr möglich, eine Bindung und eine brauchbare Dichte zu erzielen.The material between the two capsules can be a salt, a metal or a type of glass, the melting or softening temperature of this material being far below the pressing temperature used. The compression pressure is usually above 1 kbar, preferably between 3 and 10 kbar. The pressing temperature depends on the material. Suitable molding temperatures are for steel (S c hnellstahl) 1050-1100 ° C, for superalloys 1100-1250 ° C, for ceramic material from 1000 to 1700 ° C and for carbide 1400-1500 ° C. A high temperature results in a high density even at relatively low pressure and a short pressing time. If the powder temperature is lowered, the same high density can be obtained by increasing the pressure and / or the pressing time. Below a certain temperature it is no longer possible to achieve a bond and a usable density.
Das viskose Material zwischen den beiden Kapseln wirkt auch als ein Wärmespeicher, der die innere Kapsel umgibt und deren Abkühlung verzögert. Hierdurch wird verhindert, daß hinsichtlich ihres Volumens kleine und hervorstehende Teile mit großen Flächen im Verhältnis zu dem eingeschlossenen Pulvervolumen abgekühlt werden. Diese Teile behalten daher die Bindungstemperatur während einer langen Zeit bei, so daß ein Druck aufgebracht werden kann, solange die Voraussetzungen für eine Bindung gegeben sind. Es ist daher möglich, Werkstücke mit sehr dünnen herausragenden Teilen zu pressen.The viscous material between the two capsules also acts as a heat accumulator that surrounds the inner capsule and delays its cooling. This prevents small and protruding parts with large areas from being cooled in terms of their volume in relation to the enclosed powder volume. These parts therefore maintain the binding temperature for a long time so that pressure can be applied as long as the conditions for binding are met. It is therefore possible to press workpieces with very thin, outstanding parts.
Anhand der Figur soll das Verfahren nach der Erfindung näher erläutert werden.The method according to the invention will be explained in more detail with reference to the figure.
In der Figur bezeichnet 1 einen Preßtisch und 2 einen beweglichen Kolben einer im übrigen nicht dargestellten Presse. Auf dem Preßtisch ist ein Preßzylinder 3 mit einem losen inneren Boden 4 placiert. Eine innere Kapsel 5, deren Form mit der Form eines fertigen Werkstücks übereinstimmt, ist mit Pulver 6 gefüllt. Diese innere Kapsel 5 ist in der Mitte einer äußeren Kapsel 7 placiert,und von allen Seiten von einem Mittel 8 umgeben, das bei Preßtemperatur so viskos ist, daß es sich im wesentlichen wie eine Flüssigkeit verhält und dadurch einen allseitigen Druck auf die innere Kapsel 5 ausübt und das in der Kapsel eingeschlossene Pulver komprimiert, ohne die Form der Kapsel 5 nennenswert zu verändern. Die äußere Kapsel 7 ist in dem Druckraum 9 placiert, der aus dem Preßzylinder 3, dem Boden 4 und dem Kolben 2 gebildet wird. Die äußere Kapsel 7 ist von allen Seiten mit einer Schicht aus Talkpulver 10 umgeben. Wenn der Kolben 2 in den Preßzylinder 3 eingeführt wird, wird ein Druck auf das Talkpulver 10 ausgeübt. Dieser pfanzt sich bis zur äußeren Kapsel 7 fort. Das Talkpulver hat als druckübertragendes Mittel keine idealen Eigenschaften, da es die Form einer in ihm eingebetteten Kapsel in gewissem Maße verändern würde. Diese Unvollkommenheit ist ein großer Nachteil, wenn ein Werkstück komplizierter Form in nahezu seine endgültige Form und Abmessung gepreßt werden soll. Dank des viskosen Mittels 8 wird die Kapsel 5 einem allseitigen Druck ausgesetzt, so daß beim Pressen keine oder nur eine unbedeutende Formveränderung auftritt. Bei dem Material 8 kann es sich um ein solches handeln, das bei Raumtemperatur pulverförmig ist oder das aus aus Pulver gepreßten oder gegossenen Blöcken besteht, die zusammen eine der Kapsel 5 angepaßte Aushöhlung bilden. Wenn das Material 8 bei der Erhitzung seine viskosen Eigenschaften annimmt; besteht die Gefahr, daß die Kapsel 5 nach unten sinkt oder nach oben steigt. Um dies zu verhindern, können zwischen der inneren Kapsel 5 und der äußeren Kapsel 7 Stützen angebracht werden.In the figure, 1 denotes a press table and 2 a movable piston of a press, which is otherwise not shown. A
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81102953T ATE9449T1 (en) | 1980-04-25 | 1981-04-16 | PROCESS FOR THE MANUFACTURE OF POWDER PRESSINGS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8003138A SE426790B (en) | 1980-04-25 | 1980-04-25 | PROCEDURE FOR ISOSTATIC PRESSURE OF POWDER IN A Capsule |
SE8003138 | 1980-04-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0039014A1 true EP0039014A1 (en) | 1981-11-04 |
EP0039014B1 EP0039014B1 (en) | 1984-09-19 |
Family
ID=20340831
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81102953A Expired EP0039014B1 (en) | 1980-04-25 | 1981-04-16 | Method of manufacturing compacts from powder |
Country Status (6)
Country | Link |
---|---|
US (1) | US4389362A (en) |
EP (1) | EP0039014B1 (en) |
JP (1) | JPS56169703A (en) |
AT (1) | ATE9449T1 (en) |
DE (1) | DE3166124D1 (en) |
SE (1) | SE426790B (en) |
Cited By (6)
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EP0094164A1 (en) * | 1982-04-28 | 1983-11-16 | Kelsey-Hayes Company | Method of consolidating material with a cast pressure transmitter |
EP0105653A1 (en) * | 1982-09-20 | 1984-04-18 | The Dow Chemical Company | Method and assembly for hot consolidating materials |
FR2541151A1 (en) * | 1983-02-23 | 1984-08-24 | Metal Alloys Inc | PROCESS FOR CONSOLIDATING A METAL OR CERAMIC MASS |
FR2542228A1 (en) * | 1983-03-10 | 1984-09-14 | Cegedur | PRESSURE SINKING PROCESS OF ALUMINUM ALLOY POWDERS |
WO1991012911A1 (en) * | 1990-03-01 | 1991-09-05 | Asea Brown Boveri Ab | Method of manufacturing mouldings |
WO1994013419A1 (en) * | 1991-12-04 | 1994-06-23 | The Dow Chemical Company | A process for densifying powdered ceramics and cermets at temperatures above 1400 °c |
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FR2548562B1 (en) * | 1983-07-08 | 1989-02-24 | Commissariat Energie Atomique | COMPOSITE LOPIN FOR HOT PROCESSING |
US4539175A (en) * | 1983-09-26 | 1985-09-03 | Metal Alloys Inc. | Method of object consolidation employing graphite particulate |
US4564501A (en) * | 1984-07-05 | 1986-01-14 | The United States Of America As Represented By The Secretary Of The Navy | Applying pressure while article cools |
US4603062A (en) * | 1985-01-07 | 1986-07-29 | Cdp, Ltd. | Pump liners and a method of cladding the same |
SE455277B (en) * | 1986-03-21 | 1988-07-04 | Uddeholm Tooling Ab | SET FOR POWDER METAL SURGICAL PREPARING A FORM THROUGH HEAT COMPRESSION OF POWDER IN A CERAMIC FORM BY A PARTICULATED PRESSURE MEDIUM |
US4744943A (en) * | 1986-12-08 | 1988-05-17 | The Dow Chemical Company | Process for the densification of material preforms |
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US4853178A (en) * | 1988-11-17 | 1989-08-01 | Ceracon, Inc. | Electrical heating of graphite grain employed in consolidation of objects |
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RU2508572C1 (en) * | 2012-11-06 | 2014-02-27 | Федеральное государственное унитарное предприятие "Научно-исследовательский институт Научно-производственное объединение "ЛУЧ" (ФГУП "НИИ НПО "ЛУЧ") | Method of moulding cermet core billets |
RU2507616C1 (en) * | 2012-11-06 | 2014-02-20 | Федеральное государственное унитарное предприятие "Научно-исследовательский институт Научно-производственное объединение "ЛУЧ" (ФГУП "НИИ НПО "ЛУЧ") | Method to manufacture fuel rods |
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DE2200066A1 (en) * | 1971-03-01 | 1972-09-14 | Crucible Inc | Process for the production of metal-ceramic objects |
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DE3013943A1 (en) * | 1979-04-11 | 1980-10-30 | Inoue Japax Res | METHOD AND DEVICE FOR SINTERING A PARTICLE SIZE WITH A POWDER-SHAPED SHAPE |
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US2568157A (en) * | 1951-09-18 | Process of making refractory bodies | ||
SE7609074L (en) * | 1975-08-27 | 1977-02-28 | United Technologies Corp | PROCEDURE AND APPLIANCE FOR HYDROSTATIC METAL POWDER HOT PRESSING |
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SE417580B (en) * | 1979-02-27 | 1981-03-30 | Asea Ab | PROCEDURE FOR MANUFACTURING THE SUBSTANCES OF POWDER THROUGH HUGE VERSATILITY PRESSURE |
US4260582A (en) * | 1979-07-18 | 1981-04-07 | The Charles Stark Draper Laboratory, Inc. | Differential expansion volume compaction |
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1980
- 1980-04-25 SE SE8003138A patent/SE426790B/en not_active IP Right Cessation
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- 1981-04-16 EP EP81102953A patent/EP0039014B1/en not_active Expired
- 1981-04-16 AT AT81102953T patent/ATE9449T1/en not_active IP Right Cessation
- 1981-04-16 DE DE8181102953T patent/DE3166124D1/en not_active Expired
- 1981-04-20 JP JP5963781A patent/JPS56169703A/en active Pending
- 1981-04-22 US US06/256,521 patent/US4389362A/en not_active Expired - Fee Related
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FR2038758A5 (en) * | 1969-03-28 | 1971-01-08 | Commissariat Energie Atomique | |
DE2014163A1 (en) * | 1969-03-28 | 1971-12-09 | ||
DE2200066A1 (en) * | 1971-03-01 | 1972-09-14 | Crucible Inc | Process for the production of metal-ceramic objects |
FR2128306A1 (en) * | 1971-03-01 | 1972-10-20 | Crucible Inc | |
FR2376713A1 (en) * | 1977-01-11 | 1978-08-04 | Carbox Ab | Isostatic compaction vessel housing two liquids - constituting primary and secondary pressurisation agents separated by flexible diaphragm (SW 16.5.77) |
DE3013943A1 (en) * | 1979-04-11 | 1980-10-30 | Inoue Japax Res | METHOD AND DEVICE FOR SINTERING A PARTICLE SIZE WITH A POWDER-SHAPED SHAPE |
FR2453701A1 (en) * | 1979-04-11 | 1980-11-07 | Inoue Japax Res | SINTERING METHOD AND APPARATUS |
GB2051134A (en) * | 1979-04-11 | 1981-01-14 | Inoue Japax Res | Sintering method and apparatus using a multi-directional compression system and a powder mould |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0094164A1 (en) * | 1982-04-28 | 1983-11-16 | Kelsey-Hayes Company | Method of consolidating material with a cast pressure transmitter |
EP0105653A1 (en) * | 1982-09-20 | 1984-04-18 | The Dow Chemical Company | Method and assembly for hot consolidating materials |
FR2541151A1 (en) * | 1983-02-23 | 1984-08-24 | Metal Alloys Inc | PROCESS FOR CONSOLIDATING A METAL OR CERAMIC MASS |
FR2542228A1 (en) * | 1983-03-10 | 1984-09-14 | Cegedur | PRESSURE SINKING PROCESS OF ALUMINUM ALLOY POWDERS |
EP0119939A1 (en) * | 1983-03-10 | 1984-09-26 | Cegedur Societe De Transformation De L'aluminium Pechiney | Process for pressure-sintering aluminium alloy powder |
WO1991012911A1 (en) * | 1990-03-01 | 1991-09-05 | Asea Brown Boveri Ab | Method of manufacturing mouldings |
WO1994013419A1 (en) * | 1991-12-04 | 1994-06-23 | The Dow Chemical Company | A process for densifying powdered ceramics and cermets at temperatures above 1400 °c |
Also Published As
Publication number | Publication date |
---|---|
EP0039014B1 (en) | 1984-09-19 |
JPS56169703A (en) | 1981-12-26 |
US4389362A (en) | 1983-06-21 |
SE426790B (en) | 1983-02-14 |
SE8003138L (en) | 1981-10-26 |
DE3166124D1 (en) | 1984-10-25 |
ATE9449T1 (en) | 1984-10-15 |
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