EP0437917B1 - Verfahren zur inneren Oxidation zur Herstellung elektrischer Kontaktmaterialien - Google Patents

Verfahren zur inneren Oxidation zur Herstellung elektrischer Kontaktmaterialien Download PDF

Info

Publication number
EP0437917B1
EP0437917B1 EP90308996A EP90308996A EP0437917B1 EP 0437917 B1 EP0437917 B1 EP 0437917B1 EP 90308996 A EP90308996 A EP 90308996A EP 90308996 A EP90308996 A EP 90308996A EP 0437917 B1 EP0437917 B1 EP 0437917B1
Authority
EP
European Patent Office
Prior art keywords
internal
weight
silver
alloys
electrical contact
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
EP90308996A
Other languages
English (en)
French (fr)
Other versions
EP0437917A2 (de
EP0437917A3 (en
Inventor
Masaharu C/O Chugai Denki Kogyo K.K. Yida
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.)
Chugai Electric Industrial Co Ltd
Original Assignee
Chugai Electric Industrial Co Ltd
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 Chugai Electric Industrial Co Ltd filed Critical Chugai Electric Industrial Co Ltd
Publication of EP0437917A2 publication Critical patent/EP0437917A2/de
Publication of EP0437917A3 publication Critical patent/EP0437917A3/en
Application granted granted Critical
Publication of EP0437917B1 publication Critical patent/EP0437917B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • C22C32/001—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 only oxides
    • C22C32/0015—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 only oxides with only single oxides as main non-metallic constituents
    • C22C32/0021—Matrix based on noble metals, Cu or alloys thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • 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
    • H01H1/0237—Composite material having a noble metal as the basic material and containing oxides
    • H01H1/02372—Composite material having a noble metal as the basic material and containing oxides containing as major components one or more oxides of the following elements only: Cd, Sn, Zn, In, Bi, Sb or Te
    • H01H1/02376—Composite material having a noble metal as the basic material and containing oxides containing as major components one or more oxides of the following elements only: Cd, Sn, Zn, In, Bi, Sb or Te containing as major component SnO2

Definitions

  • This invention relates to a method for making electrical contact materials by the internal-oxidation of silver-solute metals alloys, whereby the solute metals in the silver matrix are converted to metal oxides which afford the alloys a high refractoriness. And, this invention also relates to such electrical contact materials, matrices of which are silver and which are produced in accordance with this invention method.
  • Silver-tin oxides alloys matrices of which are silver and solute elements of which are tin which are in turn internal-oxidized to tin oxides, are widely employed today as electrical contact materials.
  • silver-cadmium oxides alloys are known as efficient electrical contact materials, though compared to the silver-tin oxides alloys, they are less employed, because cadmium is harmful to health and becuase of the prevention of pollution.
  • auxiliary solute metals which have faster diffusion velocities and according are capable to carry and convey oxygen towards the inside of silver matrices fast.
  • a typical example of such auxiliary solute metals is indium.
  • silver-tin-indium system alloys are internal-oxidized to abtain excellent electrical contact materials.
  • electrical contact materials which are one of the best electrical contact materials industrially used today, are made by internal-oxidizing silver alloys containing 5-10 weight % of tin and 1.0-6 weight % of indium.
  • the present inventor has sought for a method of the internal-oxidation of silver-tin alloys completely and evenly without employing any auxiliary solute metal element such as indium or at least with the employment of a minimum trace amount of the auxiliary solute metal element. He perceived Zr.
  • Zr has very small solid-solubility with silver. Accordingly, when molten alloys of Ag-Sn-Zr are cooled to a solid phase, almost entire amounts of Zr contained in the alloys are precipitated dispersedly and evenly in the solid phase of Ag-Sn alloy structures. At a temperature between 500-700°C for the internal-oxidation, Zr atoms thus dispersedly precipitated remain in silver matrices as they were precipitated or as inter-metallic compounds produced with Sn at sites where they were precipitated, and act as nuclei for the oxidation and precipitation of Sn.
  • Zr is employed at an amount as much as small or at a nominal amount.
  • the employment of Zr is advantageous also in respect of the fact that their oxides are not so weak, and zirconium oxides have a higher refractoriness than tin oxides.
  • the present inventor has conducted a large number of various experiments, and discovered that even with Zr of such trace amount as 0.05-0.1 weight %, Ag-Sn alloys which contain Sn of more than 4.5% to 12%, an amount near to the upper limit of solid-solubility of Sn to Ag, can be internal-oxidized completely, if an oxygen atmosphere for the internal-oxidation is made remarkably high such as more than 10 atm.
  • a method of the complete internal-oxidation of Ag alloys which is consisted of Sn of more than 4.5 weight % to 12 weight % and a balance of Ag, is provided in which Zr is added to the alloys at a trace amount of 0.05 weight % to 0.1 weight %, and the alloys are internal-oxidized at an oxygen atmosphere of more than 10 atm to 200 atm (1 ⁇ 106-20 ⁇ 106 Pa).
  • This invention is also to provide electrical contact materials obtained by this method.
  • the above constituent (1) was melted and made to an ingot of 120mm in diameter and 40mm in length.
  • the ingot was hot-extruded into squre bars of 30mm in thickness and 50mm in width.
  • the bars were then cut to a length of 500mm each, and their upper and lower surfaces were shaved by a thickness of 3mm each to obtain square bars of 24mm in thickness, 510mm in width, and 500mm in length.
  • Alloys of the above constituents (2) and (3) of this invention were made, similarly to the above (1), into disk-shaped contacts backed with pure silver, of 6mm in diameter and 1.2mm in thickness. They were internal-oxidized, similarly to the above (1), however that in this instance, the oxygen atmosphere was made to 30 atm.
  • this conventional alloy (4) was prepared. Though this contains harmful Cd, it is known as it has fine and uniform internal oxidized structures, and in fact, it is one of the excellent today's electrical contact materials having good electrical properties.
  • This alloy (4) was internal-oxidized similarly to the alloys (1), that is, in a normal oxygen atmosphere.
  • Amounts of consumption (mg) by ASTM test method were as follows.
  • this invention can provide electrical contact materials which are made by the internal-oxidation of Ag-Sn system alloys, provided with excellent electrical performance as electrical contacts on account of extremely fine metal oxides evenly and uniformally dispered in Ag matrices.
  • one or more elements of iron family elements may be added to alloys, solely for account of further fining alloy structures at the expense of the balance element Ag. But, this is neither intended for the acceleration nor assistance of internal-oxidation by such elements.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Contacts (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Manufacture Of Switches (AREA)

Claims (3)

  1. Verfahren zur inneren Oxydation einer Silberlegierung zur Gewinnung eines elektrischen Kontaktmaterials, bei welchem die Legierung aus mehr als 4,5 Gew.-% bis zu 12 Gew.-% Sn, 0,05 bis 0,1 Gew.-% Zr und dem Rest Ag besteht und bei welchem die Legierung durch innere Oxydation in einer Sauerstoffatmosphäre von mehr als 10 bis zu 200 at (1·10⁶ bis 20·10⁶ Pa) hergestellt wird.
  2. Verfahren nach Anspruch 1, bei welchem die Legierung auch ein oder mehr Elemente der Gruppe Ni, Co und Fe in einer Menge von 0,001 bis 1 Gew.-% auf Kosten des Restelements Ag enthält.
  3. Elektrisches Kontaktmaterial, das aus einer durch innere Oxydation hergestellten Legierung gefertigt wird, die nach einem Verfahren nach Anspruch 1 oder Anspruch 2 gewonnen wurde.
EP90308996A 1990-01-19 1990-08-16 Verfahren zur inneren Oxidation zur Herstellung elektrischer Kontaktmaterialien Expired - Lifetime EP0437917B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9909/90 1990-01-19
JP2009909A JPH03215635A (ja) 1990-01-19 1990-01-19 電気接点材料の内部酸化法と電気接点材料

Publications (3)

Publication Number Publication Date
EP0437917A2 EP0437917A2 (de) 1991-07-24
EP0437917A3 EP0437917A3 (en) 1992-04-22
EP0437917B1 true EP0437917B1 (de) 1994-10-19

Family

ID=11733239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90308996A Expired - Lifetime EP0437917B1 (de) 1990-01-19 1990-08-16 Verfahren zur inneren Oxidation zur Herstellung elektrischer Kontaktmaterialien

Country Status (5)

Country Link
EP (1) EP0437917B1 (de)
JP (1) JPH03215635A (de)
KR (1) KR910014967A (de)
CN (1) CN1053509A (de)
DE (1) DE69013485T2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103714981B (zh) * 2013-12-20 2015-08-05 宁波赛特勒电子有限公司 一种继电器
CN108220650A (zh) * 2017-12-27 2018-06-29 昆明贵金属研究所 一种多组元氧化物增强银基电接触材料及其制备方法
CN110983096A (zh) * 2019-12-07 2020-04-10 福达合金材料股份有限公司 一种能提高抗熔焊性能的内氧化法制备银基体氧化物电接触材料的方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB611813A (en) * 1945-07-28 1948-11-04 Mallory Metallurg Prod Ltd Improvements in and relating to the production of metal-metal oxide compositions or alloys
DE2011002C3 (de) * 1970-03-09 1978-10-05 Fa. Dr. Eugen Duerrwaechter Doduco, 7530 Pforzheim Schmelzmetallurgisch hergestellter innenoxidierter Kontaktwerkstoff auf Silber-Kadmiumoxid-Basis
US3933485A (en) * 1973-07-20 1976-01-20 Chugai Denki Kogyo Kabushiki-Kaisha Electrical contact material
JPS51121795A (en) * 1975-04-17 1976-10-25 Nippon Tungsten Co Ltd Ag-tin oxide-system electric contact material
US4472211A (en) * 1982-05-20 1984-09-18 Chugai Denki Kogyo Kobushiki Kaisha Method of internally oxidizing Ag-Sn alloy contact material

Also Published As

Publication number Publication date
CN1053509A (zh) 1991-07-31
DE69013485D1 (de) 1994-11-24
KR910014967A (ko) 1991-08-31
DE69013485T2 (de) 1995-05-04
EP0437917A2 (de) 1991-07-24
EP0437917A3 (en) 1992-04-22
JPH03215635A (ja) 1991-09-20

Similar Documents

Publication Publication Date Title
US4150982A (en) AG-Metal oxides electrical contact materials containing internally oxidized indium oxides and/or tin oxides
EP0469578B1 (de) Elektrisches Kontaktmaterial
US4242135A (en) Electrical contact materials of internally oxidized Ag-Sn-Bi alloy
EP0031159A1 (de) Elektrischer Kontakt
US5360673A (en) Semifinished product for electric contacts made of a composite material based on silver-tin oxide and powdermetallurgical process of making said product
EP0437917B1 (de) Verfahren zur inneren Oxidation zur Herstellung elektrischer Kontaktmaterialien
US5078810A (en) Method of making Ag-SnO contact materials by high pressure internal oxidation
EP0508746A1 (de) Intern oxidierte Ag-Sn-In elektrische Kontaktwerkstofflegierungen und deren Herstellungsverfahren
EP0172411A1 (de) Vakuumschütz mit Kontaktstücken aus CuCr und Verfahren zur Herstellung dieser Kontaktstücke
US4981533A (en) Internal-oxidation method of electrical contact materials and the materials produced thereby
US4636270A (en) Internal oxidized Ag-Sn system alloy contact materials
US5286441A (en) Silver-metal oxide composite material and process for producing the same
Stevens Powder-metallurgy solutions to electrical-contact problems
EP0460680B1 (de) Kontakt für einen Vakuumschalter
EP0508055A1 (de) Auf Silberoxid basierendes elektrisches Kontaktmaterial
GB2055398A (en) Electrical contact materials of internally oxidized Ag-Sn-Bi alloy
US3437479A (en) Contact materials for vacuum switches
US5147728A (en) Ag-SnO2 electrical contact materials
US4695330A (en) Method of manufacturing internal oxidized Ag-SnO system alloy contact materials
US5102480A (en) Ag-sno-cdo electrical contact materials and manufacturing method thereof
US4647322A (en) Internal oxidized Ag-SnO system alloy electrical contact materials
EP0441018A1 (de) Elektrisches Kontaktmaterial sowie Verfahren zu dessen Herstellung
GB2093066A (en) Electrical contact material
JP3751327B2 (ja) 銀−酸化物系電気接点素子
CA2009671A1 (en) Ag-sno electrical contact materials and manufacturing method thereof

Legal Events

Date Code Title Description
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

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19911111

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17Q First examination report despatched

Effective date: 19931206

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19941019

REF Corresponds to:

Ref document number: 69013485

Country of ref document: DE

Date of ref document: 19941124

EN Fr: translation not filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19950816

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19950816

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19970822

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990601