FR2431757A1 - Doped metal oxide substrate for varistors prodn. - by adding sufficient dopant to give grain boundary deposits in base metal oxide, prior to melt diffusion of surface layer - Google Patents

Doped metal oxide substrate for varistors prodn. - by adding sufficient dopant to give grain boundary deposits in base metal oxide, prior to melt diffusion of surface layer

Info

Publication number
FR2431757A1
FR2431757A1 FR7916285A FR7916285A FR2431757A1 FR 2431757 A1 FR2431757 A1 FR 2431757A1 FR 7916285 A FR7916285 A FR 7916285A FR 7916285 A FR7916285 A FR 7916285A FR 2431757 A1 FR2431757 A1 FR 2431757A1
Authority
FR
France
Prior art keywords
metal oxide
base metal
varistors
prodn
surface layer
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
FR7916285A
Other languages
French (fr)
Other versions
FR2431757B1 (en
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.)
HERMSDORF KERAMIK VEB
Original Assignee
HERMSDORF KERAMIK VEB
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 HERMSDORF KERAMIK VEB filed Critical HERMSDORF KERAMIK VEB
Publication of FR2431757A1 publication Critical patent/FR2431757A1/en
Application granted granted Critical
Publication of FR2431757B1 publication Critical patent/FR2431757B1/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
    • H01C7/105—Varistor cores
    • H01C7/108—Metal oxide

Abstract

Semiconductive metallic oxide body consists of a semiconductive metal oxide and dopant materials, the dopant materials being formed as deposits in the grain boundaries. The body specifically has a textured or a coarse grain structure, (>30 mu). The body is prepd. by adding to the base metal oxide dopant materials in sufficient quantity to exceed their solubility in the base oxide, mixing, shaping the green ceramic and sintering for a long time to develop the desired grain texture. The pref. base metal oxide is ZnO, and the dopants are oxides, fluorides or hydrolysable salts of Co, Ni, Cr, Ti, Mn and Al.
FR7916285A 1978-07-20 1979-06-25 Doped metal oxide substrate for varistors prodn. - by adding sufficient dopant to give grain boundary deposits in base metal oxide, prior to melt diffusion of surface layer Granted FR2431757A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD20682178A DD137867A1 (en) 1978-07-20 1978-07-20 SUBSTRATE FOR CERAMIC SEMICONDUCTOR RESISTORS AND MANUFACTURING METHOD

Publications (2)

Publication Number Publication Date
FR2431757A1 true FR2431757A1 (en) 1980-02-15
FR2431757B1 FR2431757B1 (en) 1984-10-19

Family

ID=5513680

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7916285A Granted FR2431757A1 (en) 1978-07-20 1979-06-25 Doped metal oxide substrate for varistors prodn. - by adding sufficient dopant to give grain boundary deposits in base metal oxide, prior to melt diffusion of surface layer

Country Status (4)

Country Link
JP (1) JPS5533086A (en)
DD (1) DD137867A1 (en)
DE (1) DE2921497A1 (en)
FR (1) FR2431757A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3231118C1 (en) * 1982-08-20 1983-11-03 Siemens AG, 1000 Berlin und 8000 München Combined circuit arrangement with varistor and method for its production
EP3018111A1 (en) * 2014-11-07 2016-05-11 Plansee SE Metal oxide thin film, method for depositing metal oxide thin film and device comprising metal oxide thin film

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3723175A (en) * 1967-10-09 1973-03-27 Matsushita Electric Ind Co Ltd Nonlinear resistors of bulk type
FR2246038A1 (en) * 1973-09-27 1975-04-25 Gen Electric
DE2642567A1 (en) * 1975-09-25 1977-04-07 Gen Electric METAL OXYDE VARISTOR WITH IMPROVED ELECTRICAL PROPERTIES
FR2395577A1 (en) * 1977-06-23 1979-01-19 Hermsdorf Keramik Veb Ceramic semiconductor resistor, esp. thermistor and varistor prodn. - by contacting one side of moulded base powder with metal oxide and heating

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH504764A (en) * 1968-12-10 1971-03-15 Hugo Dipl Phys Wyss Method for producing an electrically conductive resistance body
GB1346851A (en) * 1971-05-21 1974-02-13 Matsushita Electric Ind Co Ltd Varistors
US3953371A (en) * 1973-11-12 1976-04-27 General Electric Company Controlled grain size metal oxide varistor and process for making

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3723175A (en) * 1967-10-09 1973-03-27 Matsushita Electric Ind Co Ltd Nonlinear resistors of bulk type
FR2246038A1 (en) * 1973-09-27 1975-04-25 Gen Electric
DE2642567A1 (en) * 1975-09-25 1977-04-07 Gen Electric METAL OXYDE VARISTOR WITH IMPROVED ELECTRICAL PROPERTIES
FR2395577A1 (en) * 1977-06-23 1979-01-19 Hermsdorf Keramik Veb Ceramic semiconductor resistor, esp. thermistor and varistor prodn. - by contacting one side of moulded base powder with metal oxide and heating

Also Published As

Publication number Publication date
FR2431757B1 (en) 1984-10-19
DD137867A1 (en) 1979-09-26
DE2921497A1 (en) 1980-01-31
JPS5533086A (en) 1980-03-08

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