US3705796A - Contact material - Google Patents

Contact material Download PDF

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Publication number
US3705796A
US3705796A US75041A US3705796DA US3705796A US 3705796 A US3705796 A US 3705796A US 75041 A US75041 A US 75041A US 3705796D A US3705796D A US 3705796DA US 3705796 A US3705796 A US 3705796A
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US
United States
Prior art keywords
contact
silver
contact material
zinc
alloy
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
US75041A
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English (en)
Inventor
Hiroaki Takahashi
Toshito Hara
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Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Application granted granted Critical
Publication of US3705796A publication Critical patent/US3705796A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals

Definitions

  • This invention provides an Ag-Zn-Al alloy contact material improving the oxidation resisting property greatly deteriorated by the existence of the zinc component, without deteriorating the excellent sulfurization resisting property of the Ag-Al alloy contact.
  • This invention forms a solid solution alloy by adding aluminum to silver or a metal the main constituent of which is silver and zinc and uses this solid solution alloy as the contact material.
  • the atom percentages of the Zn component and the Al component are 5-36% and 0.5- 5%, respectively, and Ag component, or the metal the main constituent of which is silver, constituting the remainder.
  • FIG. 1 compares, graphically, the oxidation characteristic of two embodiments of the contact material according to this invention in the air at elevated temperature with the oxidation characteristic of a conventional contact material consisting of a silver-Zinc solid solution alloy under the same condition;
  • FIG. 2 compares, graphically, the dynamic contact characteristics of two embodiments of the contact material of the invention with the dynamic contact characteristic of a conventional contact material of pure silver in the oxidizing atmosphere;
  • FIG. 3 compares the dynamic contact characteristics of two embodiments of the contact material of the invention with the dynamic contact characteristic of a conventional Patented Dec. 12, 1972 ICC contact material of pure silver in the sulfurizing atmosphere.
  • FIG. 1 compares the oxidation characteristic of two embodiments of the contact material of this invention in the air of a high temperature of 390 C. with the oxidation characteristic of a conventional Ag-Zn alloy contact material in the same atmosphere.
  • the first embodiment of this invention consists of 29 at Zn, 0.88 at Al and the remaining at Ag.
  • the second embodiment consists of 29 at Zn, 1.71 at Al and the remaining at Ag.
  • the conventional contact material consists of 30 at Zn, and the remaining at Ag.
  • the addition of the Al component of the order of 2 at can effectively improve the oxidation resisting property of the Ag-Zn alloy.
  • FIG. 2 compares the contact characteristics of said two embodiments of the contact material of this invention used in relays in the air (switching cycle 10 Hz.) with the contact characteristic of a well known silver contact in the same atmosphere
  • FIG. 3 compares the contact characteristics of the same two embodiments used in relays in the air containing 1000-2000 p.p.m. hydrogen sulfide gas and -87% R.H., switching cycle 1 Hz. with the contact characteristic of the well known silver contact in the same atmosphere.
  • No load condition was selected as the load condition as failures are most likely to occur under this condition.
  • the contact resistance was measured under the supply voltage of 50 mv. and contact current of under 10 ma. to prevent the electrical destruction of the film in the measurement.
  • the cumulative failure rate in the above figures is the percentage of the number of operations exceeding failure level (which is 10 in the example of FIG. 2 and 2.59 in the example of FIG. 3), divided by the number of measured operations, 80 to operations, at each measuring time. From 5 to 8 contacts were simultaneously tested under each condition.
  • the contact material of this invention formed by adding zinc and aluminum to silver has less contact failure in the oxidizing atmosphere and the sulfurizing atmosphere compared with the conventional silver contact and is therefore a superior contact material. Addition of above 5 at aluminum will cause the increase of the contact resistance due to the oxidation or sulfurization of the aluminum component itself and as the result the contact material becomes usable.
  • the Ag-Zn-Al alloy contact material has a contact characteristic superior to that of the silver contact in both of the oxidizing atmosphere and the sulfurizing atmosphere even under a relatively large load condition that will produce arc and the contact material of this invention is an inexpensive and useful contact material that can be substituted for the silver contact.
  • a contact material consisting essentially of 29 at zinc and 0.88-2 at aluminum, the remainder being silver.
  • the contact material of claim 1 consisting essentially of 29 at zinc, 1.71 at aluminum, the remainder being silver.

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  • 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 Switches (AREA)
  • Conductive Materials (AREA)
US75041A 1969-09-29 1970-09-24 Contact material Expired - Lifetime US3705796A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44077616A JPS4830203B1 (enExample) 1969-09-29 1969-09-29

Publications (1)

Publication Number Publication Date
US3705796A true US3705796A (en) 1972-12-12

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ID=13638832

Family Applications (1)

Application Number Title Priority Date Filing Date
US75041A Expired - Lifetime US3705796A (en) 1969-09-29 1970-09-24 Contact material

Country Status (5)

Country Link
US (1) US3705796A (enExample)
JP (1) JPS4830203B1 (enExample)
DE (1) DE2046876C3 (enExample)
FR (1) FR2064833A5 (enExample)
GB (1) GB1270199A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4131458A (en) * 1976-10-21 1978-12-26 National Research Institute For Metals Electrical contact material of silver base alloy

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4131458A (en) * 1976-10-21 1978-12-26 National Research Institute For Metals Electrical contact material of silver base alloy

Also Published As

Publication number Publication date
DE2046876B2 (de) 1973-03-29
FR2064833A5 (enExample) 1971-07-23
JPS4830203B1 (enExample) 1973-09-18
DE2046876C3 (de) 1973-10-31
GB1270199A (en) 1972-04-12
DE2046876A1 (de) 1971-05-13

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