EP0147607A1 - Varistance en oxyde de zinc - Google Patents

Varistance en oxyde de zinc Download PDF

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Publication number
EP0147607A1
EP0147607A1 EP84113877A EP84113877A EP0147607A1 EP 0147607 A1 EP0147607 A1 EP 0147607A1 EP 84113877 A EP84113877 A EP 84113877A EP 84113877 A EP84113877 A EP 84113877A EP 0147607 A1 EP0147607 A1 EP 0147607A1
Authority
EP
European Patent Office
Prior art keywords
oxide
oxygen
zinc oxide
substances
active part
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
EP84113877A
Other languages
German (de)
English (en)
Other versions
EP0147607B1 (fr
Inventor
Elias Dr. Jülke
Tony Dr. Kaiser
Maged A. Dr. Osman
Roger S. Dr. Perkins
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.)
BBC Brown Boveri AG Switzerland
Original Assignee
BBC Brown Boveri AG Switzerland
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 BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of EP0147607A1 publication Critical patent/EP0147607A1/fr
Application granted granted Critical
Publication of EP0147607B1 publication Critical patent/EP0147607B1/fr
Expired legal-status Critical Current

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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
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
    • Y10T428/31609—Particulate metal or metal compound-containing
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31652—Of asbestos
    • Y10T428/31663—As siloxane, silicone or silane
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31786—Of polyester [e.g., alkyd, etc.]

Definitions

  • the invention relates to a zinc oxide varistor according to the preamble of claim 1.
  • a varistor which, in order to prevent or slow down the oxygen diffusion, is provided with a coating of an organic polymer on the side surface running between its contact surfaces which is said to be gas impermeable.
  • JP-PS 957 072 the degradation of zinc oxide varistors in .SF 6 can be considerably slowed down by adding 10-30 S oxygen. Apart from the fact that it cannot be used if the varistors are surrounded by a liquid or solid medium, this method has the disadvantage that it requires a gas-tight partitioning of the space containing the varistors from other system parts and complicates maintenance. There is also a reduction in dielectric strength.
  • the object of the invention is to improve a generic zinc oxide varistor with respect to the oxygen impermeability of the coating covering the peripheral lateral surface.
  • the at least one oxygen barrier layer contained in the coating of a zinc oxide varistor according to the invention prevents oxygen from diffusing out of the peripheral layer of the varistor part because of the substantially oxygen-impermeable inorganic filler which drastically lengthens the diffusion paths or even gives off oxygen counteracts more than the coating of known generic zinc oxide varistors.
  • the coating of a zinc oxide varistor according to the invention is hardly more difficult to produce.
  • the organic matrix material which determines the mechanical, thermodynamic and chemical properties of said oxygen barrier layer, can moreover be used , optimized with regard to heat resistance, elasticity, thermal expansion coefficients, corrosion resistance, mechanical strength etc. and in particular also to the conditions of use such as the surrounding medium can be adapted to given special requirements essentially without regard to its oxygen permeability.
  • FIGS. 1-4 show zinc oxide varistors, which in their basic structure each contain a cylindrical active part 1 made of a sintered mass, which consists of metal oxides with a predominant proportion of zinc oxide, and 1 contact layers on the base and top surface of the active part 2a, b made of conductive material, e.g. Aluminum, which form opposite contact surfaces 3a, b.
  • the peripheral side surface between the contact surfaces 3a, b is covered with a coating 4 consisting at least partially of an organic polymer.
  • the coating 4 is designed entirely as an oxygen barrier layer 5.
  • 6 filler particles 7 are distributed in an organic matrix material. They are platelet-shaped and consist of one of the following materials: natural mica, artificial mica, vermiculite, iron mica, glass.
  • Suitable organic matrix material 6 are epoxy resins, alkyd resins, Polyurethanes, silicone resins, unsaturated polyester resins, acrylates. These substances are also commercially available as paints. They can be mixed with the filler and the side surface of the uncoated active part can be sprayed with this mixture several times. Fluidized bed sintering or electrostatic powder coating can also be used as a method for applying the oxygen barrier layer. Casting is also possible, but less suitable for series production.
  • the degradation-inhibiting effect of the oxygen barrier layer 5 should be due to the fact that the filler particles 7, which are practically impermeable to oxygen, are oriented essentially parallel to the side surface of the active part 1 and thereby form a dense structure in which diffusion paths through the oxygen barrier layer 5 running exclusively in the organic matrix material 6 compared with the thickness of which are very long. Oxygen diffused from the edge layer of the active part 1 is thereby retained in the vicinity thereof, which increases the oxygen partial pressure there and prevents further diffusion of oxygen from the active part 1.
  • one or more oxygen barrier layers 5 are formed by coating a mica tape with a carrier 8 made of paper, plastic or glass fabric, which is wound around the active part 1 in one or more layers.
  • the coating faces the active part 1, the carrier 8 is on the outside.
  • the coating in turn consists of an organic matrix material 6 with embedded filler particles 7.
  • Mica is preferably suitable as the filler, but the use of other substances in connection with the previously described or the embodiment described below is also possible.
  • the mode of operation of the oxygen barrier layer or layers 5 is of course the same as in the other embodiments.
  • the carrier 8 enables oxygen barrier layers 5 to be applied very easily and quickly by machine winding.
  • the coating 4 is again entirely designed as an oxygen barrier 5.
  • an organic matrix material distributed article 7 consist of one of the following metal oxides: iridium oxide (IrO 2 ), osmium oxide (OsO 2 ), tellurium oxide (TeO 2 ), copper oxide (Cu 2 O), bismuth oxide (Bi 2 O 3 ), lead oxide (PbO) , Antimony oxide (Sb 2 O 3 ), cobalt oxide (CoO), nickel oxide (Ni0), manganese oxide (MnO 2 , Mn 2 O 3 ), cadmium oxide (CdO), molybdenum oxide (MoO 3 ), tin oxide (SnO 2 ), tungsten oxide (WO 3 ), Iron oxide (Fe 3 O 4 ), vanadium oxide (V 2 O 5 ), zinc oxide (Zn0). Powdered active part material is also an option.
  • the substances listed in connection with the first embodiment are suitable as organic matrix materials.
  • the degradation-retarding effect of the coating should be due to the fact that the filler particles 7 release oxygen and keep the ambient oxygen partial pressure in the immediate vicinity of the edge layer of the active part 1 at a level at which the active part material does not or only slightly releases oxygen.
  • the physical effect of the mostly poorly oxygen-permeable filler as a diffusion barrier should also play a role here.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
  • Glass Compositions (AREA)
EP84113877A 1983-12-22 1984-11-16 Varistance en oxyde de zinc Expired EP0147607B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH685183 1983-12-22
CH6851/83 1983-12-22

Publications (2)

Publication Number Publication Date
EP0147607A1 true EP0147607A1 (fr) 1985-07-10
EP0147607B1 EP0147607B1 (fr) 1988-05-04

Family

ID=4316023

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84113877A Expired EP0147607B1 (fr) 1983-12-22 1984-11-16 Varistance en oxyde de zinc

Country Status (4)

Country Link
US (1) US4559167A (fr)
EP (1) EP0147607B1 (fr)
JP (1) JPS60158603A (fr)
DE (1) DE3470975D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0217021A1 (fr) * 1985-09-02 1987-04-08 BBC Brown Boveri AG Dériveur de surtension et son procédé de fabrication
EP0452511A1 (fr) * 1989-11-08 1991-10-23 Matsushita Electric Industrial Co., Ltd. Varistor a l'oxyde de zinc, production de ce composant et verre cristallise pour revetement

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0685363B2 (ja) * 1991-09-30 1994-10-26 ソマール株式会社 高電圧用バリスタ及びその製造方法
US5250229A (en) * 1991-10-10 1993-10-05 E. I. Du Pont De Nemours And Company Silver-rich conductor compositions for high thermal cycled and aged adhesion
US5742223A (en) * 1995-12-07 1998-04-21 Raychem Corporation Laminar non-linear device with magnetically aligned particles
US5932553A (en) * 1996-07-18 1999-08-03 The Regents Of The University Of California Illudin analogs useful as antitumor agents
TW345665B (en) * 1997-06-23 1998-11-21 Nat Science Council Zinc oxide varistor and multilayer chip varistor with low temperature sintering properties
JP2000091105A (ja) * 1998-09-11 2000-03-31 Murata Mfg Co Ltd チップ型セラミックサーミスタおよびその製造方法
JP2001176703A (ja) * 1999-10-04 2001-06-29 Toshiba Corp 電圧非直線抵抗体及びその製造方法
US6802116B2 (en) * 2001-03-20 2004-10-12 Abb Ab Method of manufacturing a metal-oxide varistor with improved energy absorption capability
EP1274102B1 (fr) * 2001-07-02 2011-02-23 ABB Schweiz AG Composé polymère avec une caractéristique courant-tension non linéaire et procédé de fabrication d'un composé polymère
US7015786B2 (en) * 2001-08-29 2006-03-21 Mcgraw-Edison Company Mechanical reinforcement to improve high current, short duration withstand of a monolithic disk or bonded disk stack
KR101166049B1 (ko) * 2010-12-28 2012-07-19 주식회사 아모텍 ＺｎＯ계 바리스터 조성물
US20170221612A1 (en) 2014-08-08 2017-08-03 Dongguan Littelfuse Electronics, Co., Ltd. Varistor having multilayer coating and fabrication method
EP3264427A1 (fr) * 2016-07-01 2018-01-03 ABB Schweiz AG Varistance revêtue de verre de bismuth

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100588A (en) * 1977-03-16 1978-07-11 General Electric Company Electrical overvoltage surge arrester with varistor heat transfer and sinking means
FR2485245A1 (fr) * 1980-06-23 1981-12-24 Gen Electric Varistance a l'oxyde de zinc perfectionnee et parafoudre utilisant de telles varistances
DE3116573A1 (de) * 1980-05-05 1982-04-01 ASEA AB, 72183 Västerås "ueberspannungsableiter"

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798063A (en) * 1971-11-29 1974-03-19 Diamond Shamrock Corp FINELY DIVIDED RuO{11 {11 PLASTIC MATRIX ELECTRODE
NL179524C (nl) * 1972-12-29 1986-09-16 Matsushita Electric Ind Co Ltd Werkwijze voor de vervaardiging van een spanningsafhankelijke weerstand.
US3938069A (en) * 1973-09-27 1976-02-10 General Electric Company Metal oxide varistor with passivating coating
US4031498A (en) * 1974-10-26 1977-06-21 Kabushiki Kaisha Meidensha Non-linear voltage-dependent resistor
US4210704A (en) * 1978-08-04 1980-07-01 Bell Telephone Laboratories, Incorporated Electrical devices employing a conductive epoxy resin formulation as a bonding medium
US4247364A (en) * 1979-07-02 1981-01-27 Armstrong Cork Company Method of making a smooth, dimensionally stable, mica-filled, glass fiber sheet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100588A (en) * 1977-03-16 1978-07-11 General Electric Company Electrical overvoltage surge arrester with varistor heat transfer and sinking means
DE3116573A1 (de) * 1980-05-05 1982-04-01 ASEA AB, 72183 Västerås "ueberspannungsableiter"
FR2485245A1 (fr) * 1980-06-23 1981-12-24 Gen Electric Varistance a l'oxyde de zinc perfectionnee et parafoudre utilisant de telles varistances

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0217021A1 (fr) * 1985-09-02 1987-04-08 BBC Brown Boveri AG Dériveur de surtension et son procédé de fabrication
US4805064A (en) * 1985-09-02 1989-02-14 Bbc Brown, Boveri & Company, Ltd. Lightning arrester having a housing with a high filler content
EP0452511A1 (fr) * 1989-11-08 1991-10-23 Matsushita Electric Industrial Co., Ltd. Varistor a l'oxyde de zinc, production de ce composant et verre cristallise pour revetement
EP0452511A4 (en) * 1989-11-08 1992-12-02 Matsushita Electric Industrial Co., Ltd. Zinc oxide varistor, manufacture thereof, and crystallized glass composition for coating
EP0620567A1 (fr) * 1989-11-08 1994-10-19 Matsushita Electric Industrial Co., Ltd. Varistor à l'oxyde de zinc, production de celui-ci et composition d'un verre cristallisé pour revêtement

Also Published As

Publication number Publication date
JPS60158603A (ja) 1985-08-20
DE3470975D1 (en) 1988-06-09
EP0147607B1 (fr) 1988-05-04
US4559167A (en) 1985-12-17

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