EP0334212A2 - Procédé de fabrication de pièces moulées en poudres métalliques et élément d'étanchéité produit par le procédé - Google Patents
Procédé de fabrication de pièces moulées en poudres métalliques et élément d'étanchéité produit par le procédé Download PDFInfo
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- sintered part
- pores
- layered silicate
- pressed
- mixture
- 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.)
- Withdrawn
Links
Classifications
-
- 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.
Landscapes
- 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)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19883809737 DE3809737A1 (de) | 1988-03-23 | 1988-03-23 | Verfahren zum herstellen von formteilen aus metallteilchen und daraus hergestelltes dichtungselement |
DE3809737 | 1988-03-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0334212A2 true EP0334212A2 (fr) | 1989-09-27 |
EP0334212A3 EP0334212A3 (fr) | 1990-06-13 |
Family
ID=6350459
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89104732A Withdrawn EP0334212A3 (fr) | 1988-03-23 | 1989-03-16 | Procédé de fabrication de pièces moulées en poudres métalliques et élément d'étanchéité produit par le procédé |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0334212A3 (fr) |
JP (1) | JPH01298102A (fr) |
DE (1) | DE3809737A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0481763A1 (fr) * | 1990-10-18 | 1992-04-22 | Hitachi Powdered Metals Co., Ltd. | Pièces métalliques frittées et procédé de leur production |
WO2010074627A1 (fr) * | 2008-12-22 | 2010-07-01 | Höganäs Ab (Publ) | Composition améliorant l'usinabilité |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1947963A1 (de) * | 1968-09-26 | 1970-04-02 | Allegheny Ludlum Steel | Korrosionsbestaendiger Gegenstand aus Sintermetall und Verfahren zur Herstellung desselben |
FR2397902A1 (fr) * | 1977-07-20 | 1979-02-16 | Brico Eng | Procede pour la production d'articles par la metallurgie des poudres et articles ainsi produits. |
GB2136512A (en) * | 1983-03-16 | 1984-09-19 | Metex Corp | Seal, particularly for vehicle exhaust systems |
US4531273A (en) * | 1982-08-26 | 1985-07-30 | Worcester Controls Corporation | Method for fabricating graphite filled sintered metal seats for ball valves |
GB2164070A (en) * | 1984-09-05 | 1986-03-12 | Tba Industrial Products Ltd | Heat settable sealant material |
EP0266936A1 (fr) * | 1986-10-29 | 1988-05-11 | Eaton Corporation | Ebauche en poudre métallique |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2818634A (en) * | 1954-03-17 | 1958-01-07 | Raybestos Manhattan Inc | Sintered copper friction elements containing a mineral filler |
-
1988
- 1988-03-23 DE DE19883809737 patent/DE3809737A1/de not_active Ceased
-
1989
- 1989-03-16 EP EP89104732A patent/EP0334212A3/fr not_active Withdrawn
- 1989-03-20 JP JP6915189A patent/JPH01298102A/ja active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1947963A1 (de) * | 1968-09-26 | 1970-04-02 | Allegheny Ludlum Steel | Korrosionsbestaendiger Gegenstand aus Sintermetall und Verfahren zur Herstellung desselben |
FR2397902A1 (fr) * | 1977-07-20 | 1979-02-16 | Brico Eng | Procede pour la production d'articles par la metallurgie des poudres et articles ainsi produits. |
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 (fr) * | 1986-10-29 | 1988-05-11 | Eaton Corporation | Ebauche en poudre métallique |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0481763A1 (fr) * | 1990-10-18 | 1992-04-22 | Hitachi Powdered Metals Co., Ltd. | Pièces métalliques frittées et procédé de leur production |
AU647186B2 (en) * | 1990-10-18 | 1994-03-17 | Hitachi Powdered Metals Co. Ltd. | Sintered metal parts and their production method |
WO2010074627A1 (fr) * | 2008-12-22 | 2010-07-01 | Höganäs Ab (Publ) | Composition améliorant l'usinabilité |
CN102325614A (zh) * | 2008-12-22 | 2012-01-18 | 霍加纳斯股份有限公司 | 改进可机械加工性的组合物 |
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 (zh) * | 2008-12-22 | 2017-05-31 | 霍加纳斯股份有限公司 | 改进可机械加工性的组合物 |
CN106735165B (zh) * | 2008-12-22 | 2019-09-27 | 霍加纳斯股份有限公司 | 改进可机械加工性的组合物 |
Also Published As
Publication number | Publication date |
---|---|
DE3809737A1 (de) | 1989-10-05 |
EP0334212A3 (fr) | 1990-06-13 |
JPH01298102A (ja) | 1989-12-01 |
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Legal Events
Date | Code | Title | Description |
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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 |
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AK | Designated contracting states |
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17P | Request for examination filed |
Effective date: 19900709 |
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17Q | First examination report despatched |
Effective date: 19921120 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19930327 |