FR2399129A1 - Stabilisation of metal oxide varistor against thermal runaway - is performed by diffusing silver into its external surfaces to form surface layers - Google Patents

Stabilisation of metal oxide varistor against thermal runaway - is performed by diffusing silver into its external surfaces to form surface layers

Info

Publication number
FR2399129A1
FR2399129A1 FR7821669A FR7821669A FR2399129A1 FR 2399129 A1 FR2399129 A1 FR 2399129A1 FR 7821669 A FR7821669 A FR 7821669A FR 7821669 A FR7821669 A FR 7821669A FR 2399129 A1 FR2399129 A1 FR 2399129A1
Authority
FR
France
Prior art keywords
metal oxide
silver
stabilisation
thermal runaway
surface layers
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
Application number
FR7821669A
Other languages
French (fr)
Other versions
FR2399129B1 (en
Inventor
John Edward May
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of FR2399129A1 publication Critical patent/FR2399129A1/en
Application granted granted Critical
Publication of FR2399129B1 publication Critical patent/FR2399129B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/102—Varistor boundary, e.g. surface layers

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)

Abstract

The object of the proposed process is to inhibit the tendency to thermal runaway in a metal oxide variator which has to pass full load current for extended periods. A satisfactory stabilisation of the material is achieved by coating the whole external surface of the varistor element with silver and then heating it to a temperature in excess of 500 deg.C for a length of time. During this process the silver is diffused into the outer regions of the metal oxide. The process may be extended to include the production, simultaneously with the coating and diffusion, of electrical contact surfaces on the varistor. These surfaces have a thicker layer of silver. Alternatively the contact surfaces can be added in a further manufacturing stage.
FR7821669A 1977-07-29 1978-07-21 Stabilisation of metal oxide varistor against thermal runaway - is performed by diffusing silver into its external surfaces to form surface layers Granted FR2399129A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US82036777A 1977-07-29 1977-07-29

Publications (2)

Publication Number Publication Date
FR2399129A1 true FR2399129A1 (en) 1979-02-23
FR2399129B1 FR2399129B1 (en) 1984-02-17

Family

ID=25230582

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7821669A Granted FR2399129A1 (en) 1977-07-29 1978-07-21 Stabilisation of metal oxide varistor against thermal runaway - is performed by diffusing silver into its external surfaces to form surface layers

Country Status (5)

Country Link
JP (1) JPS5441492A (en)
DE (1) DE2832735C2 (en)
FR (1) FR2399129A1 (en)
IE (1) IE47121B1 (en)
NL (1) NL7807850A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029749A1 (en) * 1979-11-27 1981-06-03 Matsushita Electric Industrial Co., Ltd. Voltage dependent resistor and method of making same

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5840259B2 (en) * 1975-11-20 1983-09-05 松下電器産業株式会社 Cassette recorder
JPH0210609Y2 (en) * 1981-02-27 1990-03-15
US4460623A (en) * 1981-11-02 1984-07-17 General Electric Company Method of varistor capacitance reduction by boron diffusion
DE3917570A1 (en) * 1989-05-30 1990-12-06 Siemens Ag Electrical ceramic component esp. cold conductor - has over-doped surface giving increased breakdown resistance
DE102014107040A1 (en) 2014-05-19 2015-11-19 Epcos Ag Electronic component and method for its production

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2138453A1 (en) * 1971-05-21 1973-01-05 Matsushita Electric Ind Co Ltd

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3857174A (en) * 1973-09-27 1974-12-31 Gen Electric Method of making varistor with passivating coating
JPS53115095A (en) * 1977-02-28 1978-10-07 Matsushita Electric Ind Co Ltd Preparation of porcelain electron articles

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2138453A1 (en) * 1971-05-21 1973-01-05 Matsushita Electric Ind Co Ltd

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029749A1 (en) * 1979-11-27 1981-06-03 Matsushita Electric Industrial Co., Ltd. Voltage dependent resistor and method of making same

Also Published As

Publication number Publication date
JPS5441492A (en) 1979-04-02
DE2832735A1 (en) 1979-02-08
IE47121B1 (en) 1983-12-28
FR2399129B1 (en) 1984-02-17
DE2832735C2 (en) 1984-10-11
NL7807850A (en) 1979-01-31
IE781395L (en) 1979-01-29

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Legal Events

Date Code Title Description
ST Notification of lapse