WO2003009311A1 - Composant electroceramique - Google Patents

Composant electroceramique Download PDF

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Publication number
WO2003009311A1
WO2003009311A1 PCT/DE2002/001938 DE0201938W WO03009311A1 WO 2003009311 A1 WO2003009311 A1 WO 2003009311A1 DE 0201938 W DE0201938 W DE 0201938W WO 03009311 A1 WO03009311 A1 WO 03009311A1
Authority
WO
WIPO (PCT)
Prior art keywords
ceramic material
electrical component
ceramic
component according
base body
Prior art date
Application number
PCT/DE2002/001938
Other languages
German (de)
English (en)
Inventor
Axel Pecina
Robert Krumphals
Original Assignee
Epcos Ag
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 Epcos Ag filed Critical Epcos Ag
Publication of WO2003009311A1 publication Critical patent/WO2003009311A1/fr

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
    • 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
    • H01C7/18—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 comprising a plurality of layers stacked between terminals

Definitions

  • the present invention relates to an electro-ceramic component with a low capacitance and at least two contact layers provided on the surface of a ceramic base body.
  • Components of the type mentioned initially include e.g. Varistors.
  • the basic body of such known components is often made from a mixture of different metal oxides, for example based on zinc oxide.
  • Varistors have a non-linear voltage-dependent change in resistance that is used to protect an electrical circuit from overvoltage. The resistance value of varistors decreases with increasing voltage.
  • multi-layer varistors have not been used for overvoltage protection of high-frequency circuits, such as high-frequency input circuits for antenna inputs. This is due to the fact that the laminar structure of the multilayer varistors and the grain boundary effect of the varistor ceramic cause the capacitors to be too high. The result of this is that the high-frequency signal is generally disadvantageously attenuated by the high capacitance of the varistor.
  • the object of the present invention is to provide an electro-ceramic component which avoids the disadvantages mentioned.
  • the invention describes an electrical component with a base body, consisting of at least a first and a second ceramic material and at least two contact surfaces applied to the surface of the base body.
  • the capacitance of the component is reduced in that the second ceramic material has a lower dielectric constant than the first ceramic material.
  • the second ceramic material primarily serves to reduce the capacitance of the entire electrical component, while the first ceramic material, apart from the capacitance, defines the electrical properties of the component.
  • the second ceramic material should be arranged at least partially between the contact layers, but need not necessarily contact them.
  • the electrical component according to the invention can be used, for example, as a varistor.
  • the first ceramic is a varistor ceramic, for example based on zinc oxide.
  • at least some regions of the first ceramic material advantageously contact both contact layers and define a current path between these contact layers.
  • the base body of which is made up of only a single ceramic material, consist in the fact that the second material enables a sometimes considerable reduction in capacitance without impairing the varistor properties of the component. This enables the use of the varistors according to the invention in highly sensitive high-frequency circuits.
  • the second material is advantageously a ceramic based on spinels with the general formula AB2O4, where A is divalent metals and B is trivalent or tetravalent metals, for example ZnMn2Ü4.
  • the A and B positions can advantageously be filled with the elements magnesium, manganese, selenium, cobalt, nickel, zinc, aluminum or iron.
  • the zinc manganese spinel for example, has a dielectric constant in the range of approximately 10 to 20 and is therefore considerably below the dielectric constant of the varistor material (approximately 400 to 800). It is also possible to use phase mixtures, for example based on zinc oxide and bismuth oxide as the second ceramic material.
  • sintering aids such as bismuth oxide or a glass melting at a suitable temperature can be added to the second material.
  • first and second ceramic materials can be sintered together, so that the manufacture of the electrical component is greatly simplified.
  • Figure 1 shows a conventional varistor.
  • FIG. 2 shows a varistor according to the invention with two ceramic materials.
  • FIG. 3 shows a varistor according to the invention with two ceramic materials, the second ceramic material not contacting the contact layers.
  • FIG. 4 shows a varistor according to the invention, which is constructed from alternating layers of the first and the second ceramic material lying one above the other.
  • FIG. 5 shows a varistor according to the invention with internal electrodes which intermesh like a comb.
  • FIG. 6 shows a varistor according to the invention with internal electrodes which are at a distance from one another.
  • FIG. 2 shows a varistor according to the invention, the base body of which consists of regions 1 of a first ceramic material and regions 5 of a second ceramic material.
  • the two contacting layers 10 and 15 contact the two ceramic materials.
  • part of the varistor base body is therefore replaced by a second ceramic which has a lower dielectric constant. Since the capacity-reducing influence of the second ceramic material on the varistor is also possible if the second ceramic material does not contact the contact surfaces 10 and 15, an embodiment shown in FIG. 3 is also possible.
  • the second ceramic material is on the first ceramic material, the varistor ceramic, applied without contacting the contact layers.
  • a construction from alternating layers of the first and second ceramic material lying one above the other is also possible, as shown in FIG.
  • multilayer varistors can also be realized with inner electrodes 25, in which each inner electrode only contacts one contact layer 10 or 15, so that electrode stacks 30, 35 are formed, which are each connected to only one contact layer.
  • These electrodes are advantageously only arranged in the first ceramic material, the varistor ceramic, and not in the second ceramic material.
  • FIG. 6 shows an alternative embodiment in which the inner electrodes do not intermesh like a comb, but in which comb-like electrode stacks face each other at a distance, the area 40 between the electrode stacks 30, 35 consisting of the ceramic material 1.
  • the varistor voltage was approximately 370 V.
  • the first ceramic material used for both varistor types was a varistor ceramic based on zinc oxide, while ZnMn2 ⁇ 4 was additionally used as the second material for the varistor according to the invention.

Landscapes

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

Abstract

L'invention concerne un composant électrique présentant une capacité amoindrie, une base comportant des zones constituées d'une première matière céramique (1) ainsi que des zones constituées d'une seconde matière céramique (5), cette seconde matière céramique présentant une constante diélectrique inférieure à celle de la première matière céramique. Sur la surface de la base sont disposées deux couches de contact (10 et 15), toutes deux en contact avec la première matière céramique, un trajet de courant est défini entre les deux couches de contact et les propriétés électriques du composant, excepté sa capacité, sont déterminées.
PCT/DE2002/001938 2001-07-17 2002-05-27 Composant electroceramique WO2003009311A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001134751 DE10134751C1 (de) 2001-07-17 2001-07-17 Elektrokeramisches Bauelement
DE10134751.0 2001-07-17

Publications (1)

Publication Number Publication Date
WO2003009311A1 true WO2003009311A1 (fr) 2003-01-30

Family

ID=7692104

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/001938 WO2003009311A1 (fr) 2001-07-17 2002-05-27 Composant electroceramique

Country Status (3)

Country Link
DE (1) DE10134751C1 (fr)
TW (1) TW564439B (fr)
WO (1) WO2003009311A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7167352B2 (en) * 2004-06-10 2007-01-23 Tdk Corporation Multilayer chip varistor
DE102004045009B4 (de) * 2004-09-16 2008-03-27 Epcos Ag Elektrisches Bauelement und dessen Verwendung
DE102005028498B4 (de) 2005-06-20 2015-01-22 Epcos Ag Elektrisches Vielschichtbauelement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5073302A (en) * 1988-02-18 1991-12-17 Somar Corporation Varistor material and process for production therefor
US5115221A (en) * 1990-03-16 1992-05-19 Ecco Limited Varistor structures
US5976420A (en) * 1997-02-17 1999-11-02 Murata Manufacturing Co., Ltd. Chip type varistor and ceramic compositions for the same
US6087923A (en) * 1997-03-20 2000-07-11 Ceratech Corporation Low capacitance chip varistor and fabrication method thereof
DE19931056A1 (de) * 1999-07-06 2001-01-25 Epcos Ag Vielschichtvaristor niedriger Kapazität

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5073302A (en) * 1988-02-18 1991-12-17 Somar Corporation Varistor material and process for production therefor
US5115221A (en) * 1990-03-16 1992-05-19 Ecco Limited Varistor structures
US5976420A (en) * 1997-02-17 1999-11-02 Murata Manufacturing Co., Ltd. Chip type varistor and ceramic compositions for the same
US6087923A (en) * 1997-03-20 2000-07-11 Ceratech Corporation Low capacitance chip varistor and fabrication method thereof
DE19931056A1 (de) * 1999-07-06 2001-01-25 Epcos Ag Vielschichtvaristor niedriger Kapazität

Also Published As

Publication number Publication date
DE10134751C1 (de) 2002-10-10
TW564439B (en) 2003-12-01

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