EP0338401B1 - Pulvermetallurgisches Verfahren zum Herstellen eines Halbzeugs für elektrische Kontakte aus einem Verbundwerkstoff auf Silberbasis mit Eisen - Google Patents

Pulvermetallurgisches Verfahren zum Herstellen eines Halbzeugs für elektrische Kontakte aus einem Verbundwerkstoff auf Silberbasis mit Eisen Download PDF

Info

Publication number
EP0338401B1
EP0338401B1 EP89106490A EP89106490A EP0338401B1 EP 0338401 B1 EP0338401 B1 EP 0338401B1 EP 89106490 A EP89106490 A EP 89106490A EP 89106490 A EP89106490 A EP 89106490A EP 0338401 B1 EP0338401 B1 EP 0338401B1
Authority
EP
European Patent Office
Prior art keywords
powder
silver
alloy
composite
composite material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89106490A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0338401A1 (de
Inventor
Volker Dr. Dipl.-Phys. Behrens
Roland Dr. Dipl.-Ing. Michal
Karl E. Dr. Dipl.-Phys. Saeger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Doduco Solutions GmbH
Original Assignee
Doduco GmbH and Co KG Dr Eugen Duerrwaechter
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Doduco GmbH and Co KG Dr Eugen Duerrwaechter filed Critical Doduco GmbH and Co KG Dr Eugen Duerrwaechter
Publication of EP0338401A1 publication Critical patent/EP0338401A1/de
Application granted granted Critical
Publication of EP0338401B1 publication Critical patent/EP0338401B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/30—Making metallic powder or suspensions thereof using chemical processes with decomposition of metal compounds, e.g. by pyrolysis
    • 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
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
    • B22F9/26—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions using gaseous reductors
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0466—Alloys based on noble metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H01H1/023—Composite material having a noble metal as the basic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/048—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by powder-metallurgical processes

Definitions

  • the invention is based on a powder metallurgical process for producing a semi-finished product for electrical contacts from a composite material based on silver 5 to 50 wt .-% iron as the first secondary component and 0 to 5% by weight of a second secondary component from one or more substances from the group which contains the metals titanium, zircon, niobium, tantalum, molybdenum, tungsten, manganese, copper and zinc, and the rest of silver as the main component, which is disclosed in the older, but not prepublished DE-A-38 16 895.
  • the individual constituents of the composite material are mixed with one another in powder form, pressed into shaped bodies and sintered, that is to say produced by a conventional powder metallurgical process.
  • the composite material cannot be produced by melt metallurgy, because iron is not significantly soluble in silver even in the molten state.
  • a previously published prior art can be found in Japanese patent application 79/148 109, which is electrical Contact materials are disclosed which, in addition to silver, also contain iron, nickel, chromium and / or cobalt, including a material with the composition Ag90 Fe10.
  • the contact materials in question are to be used as a replacement for conventional contact materials made of silver-nickel in low-voltage switchgear, in particular in motor contactors. They are therefore expected to combine low burn-up, low tendency to weld, consistently low contact resistance (and thus low contact heating) and good arc quenching.
  • the invention has for its object to find a way in which the frequency of spontaneously occurring increases in contact resistance can be reduced.
  • Alloy powders and composite powders which can be used in the process according to the invention can be produced not only by spray pyrolysis, but also in other ways, for example by chemical mixed precipitation of the metals provided for the alloy or composite powders from a solution of their salts or by atomizing of molten metals. Chemical mixed precipitation is suitable for the production of composite powders from those components that can be dissolved and chemically precipitated under similar conditions.
  • the atomization of molten metals is primarily considered for the production of alloy or composite powders from metals which are soluble in one another at least in the molten state in the quantitative ratios of interest here, which is true for iron pairings with most of the metals intended for the second secondary component;
  • manganese is also firmly soluble in an amount of up to a few percent, whereas titanium and zircon in silver are not soluble in the solid state, but are to a certain extent soluble in the molten state.
  • a composite powder can only be formed by atomization if the molten metals are mixed intensively with one another by stirring or if the spray jets of the molten metals are allowed to penetrate one another.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Contacts (AREA)
EP89106490A 1988-04-16 1989-04-12 Pulvermetallurgisches Verfahren zum Herstellen eines Halbzeugs für elektrische Kontakte aus einem Verbundwerkstoff auf Silberbasis mit Eisen Expired - Lifetime EP0338401B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3812686 1988-04-16
DE3812686 1988-04-16

Publications (2)

Publication Number Publication Date
EP0338401A1 EP0338401A1 (de) 1989-10-25
EP0338401B1 true EP0338401B1 (de) 1995-09-27

Family

ID=6352116

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89106490A Expired - Lifetime EP0338401B1 (de) 1988-04-16 1989-04-12 Pulvermetallurgisches Verfahren zum Herstellen eines Halbzeugs für elektrische Kontakte aus einem Verbundwerkstoff auf Silberbasis mit Eisen

Country Status (3)

Country Link
EP (1) EP0338401B1 (es)
DE (1) DE58909449D1 (es)
ES (1) ES2080052T3 (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4117312A1 (de) * 1991-05-27 1992-12-03 Siemens Ag Kontaktwerkstoff auf silberbasis zur verwendung in schaltgeraeten der energietechnik sowie verfahren zur herstellung von kontaktstuecken aus diesem werkstoff
DE102004036113B4 (de) * 2004-07-24 2006-10-05 Ami Doduco Gmbh Löschblech für eine Lichtbogen-Löschkammer
JP5342931B2 (ja) * 2009-06-05 2013-11-13 マブチモーター株式会社 摺動接点材料及びクラッド複合材並びにモーター
CN102114546A (zh) * 2011-03-29 2011-07-06 兰州金川新材料科技股份有限公司 一种球形银粉的制备方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0294693A2 (de) * 1987-06-06 1988-12-14 Degussa Aktiengesellschaft Verwendung eines Silber-Eisen-Werkstoffs für elektrische Kontakte

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE643567C (de) * 1931-12-25 1937-04-12 Molybdenum Comp Nv Verfahren zur Herstellung von Zwei- oder Mehrstoffkoerpern
GB563511A (en) * 1942-02-25 1944-08-17 Mallory Metallurg Prod Ltd Improvements in and relating to electric contacting elements
DE888178C (de) * 1943-04-04 1953-08-31 Degussa Auf pulvermetallurgischem Wege hergestellter Kontaktwerkstoff aus Metallen mit guter elektrischer Leitfaehigkeit und einer Hartstoffkomponente
US2806786A (en) * 1954-05-14 1957-09-17 Gen Electric Method of making sintered electrical contact material
DE1029571B (de) * 1956-07-13 1958-05-08 Siemens Ag Verfahren zur Herstellung eines Sinterverbundwerkstoffes, insbesondere fuer elektrische Kontakte
GB1489545A (en) * 1976-05-20 1977-10-19 Meidensha Electric Mfg Co Ltd Electrical contact materials for vacuum switches
DE2853931A1 (de) * 1978-12-14 1980-06-19 Dornier System Gmbh Verfahren zur herstellung metallischer pulver
DE2929630C2 (de) * 1979-07-21 1983-12-15 Dornier System Gmbh, 7990 Friedrichshafen Verfahren zur Herstellung von Silberpulver

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0294693A2 (de) * 1987-06-06 1988-12-14 Degussa Aktiengesellschaft Verwendung eines Silber-Eisen-Werkstoffs für elektrische Kontakte

Also Published As

Publication number Publication date
ES2080052T3 (es) 1996-02-01
EP0338401A1 (de) 1989-10-25
DE58909449D1 (de) 1995-11-02

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