WO1988002921A3 - Varistors a oxyde metallique, compositions pulverulentes de precurseurs et procede de preparation - Google Patents

Varistors a oxyde metallique, compositions pulverulentes de precurseurs et procede de preparation Download PDF

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Publication number
WO1988002921A3
WO1988002921A3 PCT/US1987/002695 US8702695W WO8802921A3 WO 1988002921 A3 WO1988002921 A3 WO 1988002921A3 US 8702695 W US8702695 W US 8702695W WO 8802921 A3 WO8802921 A3 WO 8802921A3
Authority
WO
WIPO (PCT)
Prior art keywords
oxide
powder
metal oxide
varistors
precursor
Prior art date
Application number
PCT/US1987/002695
Other languages
English (en)
Other versions
WO1988002921A2 (fr
Inventor
Mark S Thompson
Gary H Wiseman
Edward S Sherman
Original Assignee
Raychem Corp
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25443158&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1988002921(A3) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Raychem Corp filed Critical Raychem Corp
Priority to AT87907859T priority Critical patent/ATE72908T1/de
Priority to DE8787907859T priority patent/DE3776898D1/de
Priority to BR8707507A priority patent/BR8707507A/pt
Publication of WO1988002921A2 publication Critical patent/WO1988002921A2/fr
Publication of WO1988002921A3 publication Critical patent/WO1988002921A3/fr
Priority to KR1019880700679A priority patent/KR880701958A/ko

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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G9/00—Compounds of zinc
    • C01G9/02—Oxides; Hydroxides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/14—Methods for preparing oxides or hydroxides in general
    • C01B13/36—Methods for preparing oxides or hydroxides in general by precipitation reactions in aqueous solutions
    • C01B13/363—Mixtures of oxides or hydroxides by precipitation
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/453—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zinc, tin, or bismuth oxides or solid solutions thereof with other oxides, e.g. zincates, stannates or bismuthates
    • 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
    • H01C7/112—ZnO type

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Ceramic Engineering (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Thermistors And Varistors (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

Procédé de préparation d'une poudre de précurseur de varistor à oxyde métallique consistant (a) à dissoudre des précurseurs solubles d'oxydes métalliques additifs, par exemple du nitrate de bismuth à titre de précurseur pour l'oxyde de bismuth, en solution aqueuse, (b) à former une suspension ou une bouillie dans la solution aqueuse d'une poudre de l'oxyde métallique primaire désiré, par exemple l'oxyde de zinc, dont les particules présentent les dimensions désirées, (c) à ajouter un réactif de précipitation afin de convertir le métal additif de la forme précurseur soluble en forme oxyde ou oxyde hydraté et à précipiter l'oxyde ou l'oxyde hydraté en présence des particules d'oxyde métallique primaire, (d) à extraire l'eau ainsi que les sous-produits de sels pour former une poudre. La poudre précurseur ainsi obtenue contient des particules d'oxydes métalliques additifs de dimensions plus petites réparties uniformément parmi les particules de dimensions plus importantes de l'oxyde métallique primaire. Les varistors préparés à partir de cette poudre peuvent être frittés à des températures inférieures aux températures de frittage habituellement utilisées, par exemple 900°C à 1000°C et les varistors ainsi obtenus possèdent des propriétés de voltage maximum par région de grain supérieures à celles des varistors conventionnels, par exemple 3,75 à 4,5, ainsi que des constantes diélectriques inférieures à celles des varistors conventionnels, par exemple inférieures à 1000.
PCT/US1987/002695 1986-10-16 1987-10-14 Varistors a oxyde metallique, compositions pulverulentes de precurseurs et procede de preparation WO1988002921A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT87907859T ATE72908T1 (de) 1986-10-16 1987-10-14 Verfahren zur herstellung eines metalloxidpulvers fuer einen varistor.
DE8787907859T DE3776898D1 (de) 1986-10-16 1987-10-14 Verfahren zur herstellung eines metalloxidpulvers fuer einen varistor.
BR8707507A BR8707507A (pt) 1986-10-16 1987-10-14 Varistores de oxido metalico,composicao em po de precursor,e metodos para a sua preparacao
KR1019880700679A KR880701958A (ko) 1986-10-16 1988-06-16 금속산화물 배리스터, 이들의 전구물질 분말조성물 및 이들의 제조방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US92010086A 1986-10-16 1986-10-16
US920,100 1986-10-16

Publications (2)

Publication Number Publication Date
WO1988002921A2 WO1988002921A2 (fr) 1988-04-21
WO1988002921A3 true WO1988002921A3 (fr) 1988-05-05

Family

ID=25443158

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1987/002695 WO1988002921A2 (fr) 1986-10-16 1987-10-14 Varistors a oxyde metallique, compositions pulverulentes de precurseurs et procede de preparation

Country Status (8)

Country Link
EP (1) EP0289582B1 (fr)
JP (1) JP2580302B2 (fr)
KR (1) KR880701958A (fr)
AT (1) ATE72908T1 (fr)
BR (1) BR8707507A (fr)
CA (1) CA1332278C (fr)
DE (1) DE3776898D1 (fr)
WO (1) WO1988002921A2 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5143711A (en) * 1989-12-05 1992-09-01 Asea Brown Boveri Ltd. Process for manufacturing a precursor powder for use in making a varistor and a powder manufactured in this process
US4996510A (en) * 1989-12-08 1991-02-26 Raychem Corporation Metal oxide varistors and methods therefor
US5153554A (en) * 1990-05-08 1992-10-06 Raychem Corp. Low voltage varistor array
US5124822A (en) * 1990-05-08 1992-06-23 Raychem Corporation Varistor driven liquid crystal display
KR940010133A (ko) * 1992-10-20 1994-05-24 모리시타 요이찌 산화아연바리스터의 제조방법
JP3733599B2 (ja) * 1993-08-11 2006-01-11 住友化学株式会社 金属酸化物粉末およびその製造方法
JP3738454B2 (ja) * 1993-08-11 2006-01-25 住友化学株式会社 複合金属酸化物粉末およびその製造方法
EP1812340B1 (fr) * 2004-06-25 2020-11-04 Very Small Particle Company Pty Ltd Procede de production de particules a grains fins
AU2005256170B2 (en) * 2004-06-25 2010-09-02 The Very Small Particle Company Pty Ltd Method for producing fine-grained particles
WO2007000014A1 (fr) * 2005-06-29 2007-01-04 Very Small Particle Company Pty Ltd Procede de fabrication d'oxydes metalliques
CN101630553B (zh) * 2009-07-17 2011-10-12 立昌先进科技股份有限公司 一种氧化锌变阻器的制备方法
DE102016104990A1 (de) * 2016-03-17 2017-09-21 Epcos Ag Keramikmaterial, Varistor und Verfahren zum Herstellen des Keramikmaterials und des Varistors

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2526137A1 (de) * 1975-06-10 1976-12-30 Siemens Ag Verfahren zur herstellung eines spannungsabhaengigen widerstandskoerpers
EP0097923A1 (fr) * 1982-06-25 1984-01-11 Kabushiki Kaisha Toshiba Varistor en oxyde métallique
EP0154184A1 (fr) * 1984-02-21 1985-09-11 GTE Laboratories Incorporated Procédé de préparation de varistances à oxyde métallique homogène

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2526137A1 (de) * 1975-06-10 1976-12-30 Siemens Ag Verfahren zur herstellung eines spannungsabhaengigen widerstandskoerpers
EP0097923A1 (fr) * 1982-06-25 1984-01-11 Kabushiki Kaisha Toshiba Varistor en oxyde métallique
EP0154184A1 (fr) * 1984-02-21 1985-09-11 GTE Laboratories Incorporated Procédé de préparation de varistances à oxyde métallique homogène

Also Published As

Publication number Publication date
EP0289582A1 (fr) 1988-11-09
CA1332278C (fr) 1994-10-11
ATE72908T1 (de) 1992-03-15
JP2580302B2 (ja) 1997-02-12
EP0289582B1 (fr) 1992-02-26
JPH01501062A (ja) 1989-04-13
DE3776898D1 (de) 1992-04-02
KR880701958A (ko) 1988-11-07
BR8707507A (pt) 1989-02-21
WO1988002921A2 (fr) 1988-04-21

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