US3795048A - Method for manufacturing non-linear resistors - Google Patents

Method for manufacturing non-linear resistors Download PDF

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Publication number
US3795048A
US3795048A US00327177A US3795048DA US3795048A US 3795048 A US3795048 A US 3795048A US 00327177 A US00327177 A US 00327177A US 3795048D A US3795048D A US 3795048DA US 3795048 A US3795048 A US 3795048A
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US
United States
Prior art keywords
sintered
wafers
varistor
linear resistors
superposed
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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
US00327177A
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English (en)
Inventor
K Tachibana
M Nishioka
M Ono
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Mitsubishi Mining and Cement Co Ltd
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Mitsubishi Mining and Cement Co Ltd
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Publication of US3795048A publication Critical patent/US3795048A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y10T29/49101—Applying terminal

Definitions

  • DiPalma Attorney, Agent, or Firm-Brenner & Wray ABSTRACT A method for manufacturing non linear resistors comprising superposing several sintered wafers and applying silver electrodes to opposite surfaces of the sintered wafers superposed respectively is disclosed.
  • the sintered wafer consisting essentially of iron oxide and copper oxide has negative resistance and also possesses such thermister constant BK a nd s pe i tic res i stance R0 K!) at 273 K as satisfy the relation B X R0 5 10KQK.
  • the non-linear resistors manufactured by this method based on utilization of the property of the contact surfaces between the sintered wafers superposed, have remarkably stable volt-ampere I characteristics and are inexpensive in cost,
  • This invention relates to a novel method for manufacturing non-linear resistors comprising superposing several sintered wafers, said sintered wafer having negative resistance and also possessing the thermistor constant BK and the specific resistance R KQ at 273 K Hastin s/"afaintingremiss (T):
  • thermoister sintered oxide material
  • a primary object of this invention is to provide a method for manufacturing a varistor which has'a remarkably stable volt-ampere characteristic
  • Another object of thisinvention is to provide a method for manufacturing a varistor which is able to be small-sized.
  • Still another object of this invention is to provide a method for manufacturing a varistor which is inexpensive in cost.
  • a method for manufacturing a non-linear resister comprising superposing several sintered wafers, said sintered wafer having negativeresistance and also possessing the thermister constant BK and the specific resistiiiiEFRbKIYflT/FKYBM satisfy the relation PIXRo 10,000 K!) K, and applying electrodes to opposite surfaces of said sintered wafers superposed respectively.
  • FIG. 1 is a sectional view of a varistor manufactured by the method of this invention.
  • FIG. 2 shows a volt-ampere characteristic suitable for a varistor.
  • FIG. 3 shows a volt-ampere characteristic unsuitable for a varistor.
  • this invention provides a method for manufacturing a varistor comprising, for example, superposing two sintered wafers 1, 1, each sintered wafer obtained by processing and sintering a thermister material so as to make the product of BK and R KQ and thereof be not more than l0,000KQ- K, applying electrodes, for example silver electrodes 2, 2 to opposite surfaces of the sintered wafers 1, l superposed respectively in a conventional manner, attaching lead wires 5,
  • the wafer l is a sintered plate having any one of various shapes such as circular, square, rectangular, etc.
  • This invention also provides a method for manufacturing a non-linear resistor comprising superposing more than three plates of said sintered wafers and applying electrodes to opposite surfaces of said sintered wafers superposed in the same manner.
  • the thus manufactured resistors have remarkably stable volt-ampere characteristics as shown in H6. 2, thus providing to be suitable for a'varistor. 7
  • varistors of this invention have, asrExample shows, remarkably stable volt-ampere characteristics, their yield rate is much higher, as compared with the conventional methods. Moreover, as the varistors of this invention utilize iron oxide, copper oxide, etc. as the main raw materials, they are. also advantageous in cost. This invention, as described hereinabove, provides a method for manufacturing varistors having remarkably stable characteristics at much higher yield rate and at quite lower cost, therefore it is industrially of great value.
  • the sintered body is prepared byaconventional technique.
  • the starting material in the composite de fined in Table 1 is respectively mixed in a potmill so as to produce a homogeneous mixture.
  • the mixture is dried in a dryer, pressed in a mold at a pressure of about IOOOkg/cm into a disc of 15mm in diameter and 2mm in thickness.
  • the pressed disc is sintered in air at about 1,000. C, thus the sintered disc 1 is obtained.
  • a varistor is manufactured by superposing the sintered disc 1 upon the other, applying silver electrodes 2, 2 to opposite surfaces of the sintered discs ll, 1 superposed, asttaching lead wires 5, 5 to the silver electrodes 2, 2 by using solder 4 and coating over the whole with epoxy resin 6.
  • a method for manufacturing a non-linear resistor comprising superposing several sintered wafers, said sintered wafers having negative resistance and also pos- 10,000KQ" K, and applying electrodes to op-
US00327177A 1972-02-16 1973-01-26 Method for manufacturing non-linear resistors Expired - Lifetime US3795048A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1630572A JPS549294B2 (de) 1972-02-16 1972-02-16

Publications (1)

Publication Number Publication Date
US3795048A true US3795048A (en) 1974-03-05

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ID=11912812

Family Applications (1)

Application Number Title Priority Date Filing Date
US00327177A Expired - Lifetime US3795048A (en) 1972-02-16 1973-01-26 Method for manufacturing non-linear resistors

Country Status (4)

Country Link
US (1) US3795048A (de)
JP (1) JPS549294B2 (de)
DE (1) DE2307322C3 (de)
FR (1) FR2172134B1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4148135A (en) * 1978-03-10 1979-04-10 General Electric Company Method of treating metal oxide varistors to reduce power loss
DE2853134A1 (de) * 1977-12-09 1979-06-13 Matsushita Electric Ind Co Ltd Keramikvaristor
EP0050735A1 (de) * 1980-10-27 1982-05-05 General Electric Company Zinkoxid-Varistor und Verfahren zu seiner Herstellung
US4374456A (en) * 1979-04-12 1983-02-22 Ngk Spark Plug Co., Ltd. Process for producing a gas detecting element
US4531110A (en) * 1981-09-14 1985-07-23 At&T Bell Laboratories Negative temperature coefficient thermistors
US5313184A (en) * 1991-12-21 1994-05-17 Asea Brown Boveri Ltd. Resistor with PTC behavior
US5858533A (en) * 1993-10-15 1999-01-12 Abb Research Ltd. Composite material
US20160293300A1 (en) * 2015-04-03 2016-10-06 Thinking Electronic Industrial Co., Ltd. Preparation method for electronic components with an alloy electrode layer

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2052856B (en) * 1979-06-18 1983-08-10 Gen Electric Coating protecting varistor during manufacture
DE3900787A1 (de) * 1989-01-12 1990-07-19 Siemens Ag Verfahren zur herstellung eines keramischen elektrischen bauelementes
JP3710602B2 (ja) * 1997-07-25 2005-10-26 国産電機株式会社 発電装置
US8383202B2 (en) 2008-06-13 2013-02-26 Kateeva, Inc. Method and apparatus for load-locked printing
US9048344B2 (en) 2008-06-13 2015-06-02 Kateeva, Inc. Gas enclosure assembly and system
US10434804B2 (en) 2008-06-13 2019-10-08 Kateeva, Inc. Low particle gas enclosure systems and methods
US8899171B2 (en) 2008-06-13 2014-12-02 Kateeva, Inc. Gas enclosure assembly and system
KR101878084B1 (ko) 2013-12-26 2018-07-12 카티바, 인크. 전자 장치의 열 처리를 위한 장치 및 기술
KR102059313B1 (ko) 2014-04-30 2019-12-24 카티바, 인크. 가스 쿠션 장비 및 기판 코팅 기술

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2720573A (en) * 1951-06-27 1955-10-11 Dick O R Lundqvist Thermistor disks
US3124772A (en) * 1961-11-20 1964-03-10 Milliamperes
FR1446249A (fr) * 1964-09-11 1966-07-15 Danfoss As Perfectionnements apportés aux résistances électriques en matière céramique
US3343114A (en) * 1963-12-30 1967-09-19 Texas Instruments Inc Temperature transducer
US3503029A (en) * 1968-04-19 1970-03-24 Matsushita Electric Ind Co Ltd Non-linear resistor
US3689863A (en) * 1969-12-08 1972-09-05 Matsushita Electric Ind Co Ltd Voltage dependent resistors in a surface barrier type

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB579994A (en) * 1944-02-25 1946-08-22 Colin Henry William Clark Improvements in or relating to electric potential sensitive resistances
US3150342A (en) * 1960-02-10 1964-09-22 Morganite Resistors Ltd Non-linear resistors

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2720573A (en) * 1951-06-27 1955-10-11 Dick O R Lundqvist Thermistor disks
US3124772A (en) * 1961-11-20 1964-03-10 Milliamperes
US3343114A (en) * 1963-12-30 1967-09-19 Texas Instruments Inc Temperature transducer
FR1446249A (fr) * 1964-09-11 1966-07-15 Danfoss As Perfectionnements apportés aux résistances électriques en matière céramique
US3503029A (en) * 1968-04-19 1970-03-24 Matsushita Electric Ind Co Ltd Non-linear resistor
US3689863A (en) * 1969-12-08 1972-09-05 Matsushita Electric Ind Co Ltd Voltage dependent resistors in a surface barrier type

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2853134A1 (de) * 1977-12-09 1979-06-13 Matsushita Electric Ind Co Ltd Keramikvaristor
US4148135A (en) * 1978-03-10 1979-04-10 General Electric Company Method of treating metal oxide varistors to reduce power loss
US4374456A (en) * 1979-04-12 1983-02-22 Ngk Spark Plug Co., Ltd. Process for producing a gas detecting element
EP0050735A1 (de) * 1980-10-27 1982-05-05 General Electric Company Zinkoxid-Varistor und Verfahren zu seiner Herstellung
US4531110A (en) * 1981-09-14 1985-07-23 At&T Bell Laboratories Negative temperature coefficient thermistors
US5313184A (en) * 1991-12-21 1994-05-17 Asea Brown Boveri Ltd. Resistor with PTC behavior
US5858533A (en) * 1993-10-15 1999-01-12 Abb Research Ltd. Composite material
US20160293300A1 (en) * 2015-04-03 2016-10-06 Thinking Electronic Industrial Co., Ltd. Preparation method for electronic components with an alloy electrode layer

Also Published As

Publication number Publication date
JPS549294B2 (de) 1979-04-23
DE2307322A1 (de) 1973-09-06
DE2307322C3 (de) 1980-04-03
FR2172134A1 (de) 1973-09-28
DE2307322B2 (de) 1979-07-26
FR2172134B1 (de) 1977-12-30
JPS4941891A (de) 1974-04-19

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