EP0399295B1 - Pâte résistive propre à la fabrication d'une résistance électrique en couche et couche résistive fabriquée à partir de celle-ci - Google Patents

Pâte résistive propre à la fabrication d'une résistance électrique en couche et couche résistive fabriquée à partir de celle-ci Download PDF

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Publication number
EP0399295B1
EP0399295B1 EP90108782A EP90108782A EP0399295B1 EP 0399295 B1 EP0399295 B1 EP 0399295B1 EP 90108782 A EP90108782 A EP 90108782A EP 90108782 A EP90108782 A EP 90108782A EP 0399295 B1 EP0399295 B1 EP 0399295B1
Authority
EP
European Patent Office
Prior art keywords
resistance
paste according
resistance paste
glassy carbon
carbon
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.)
Expired - Lifetime
Application number
EP90108782A
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German (de)
English (en)
Other versions
EP0399295A3 (fr
EP0399295A2 (fr
Inventor
Peter Dipl.-Chem. Ambros
Walter Budig
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.)
Preh GmbH
Original Assignee
Preh GmbH
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Publication date
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Application filed by Preh GmbH filed Critical Preh GmbH
Publication of EP0399295A2 publication Critical patent/EP0399295A2/fr
Publication of EP0399295A3 publication Critical patent/EP0399295A3/fr
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Publication of EP0399295B1 publication Critical patent/EP0399295B1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/06—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base
    • H01C17/065—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base by thick film techniques, e.g. serigraphy
    • H01C17/06506—Precursor compositions therefor, e.g. pastes, inks, glass frits
    • H01C17/06513—Precursor compositions therefor, e.g. pastes, inks, glass frits characterised by the resistive component
    • H01C17/0652—Precursor compositions therefor, e.g. pastes, inks, glass frits characterised by the resistive component containing carbon or carbides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H01C10/305—Adjustable resistors the contact sliding along resistive element consisting of a thick film
    • H01C10/306—Polymer thick film, i.e. PTF

Definitions

  • the invention relates to a resistance paste made of curable, polymeric binder suitable for the production of electrical resistance layers with at least one electrically conductive pigment dispersed therein and with solvents.
  • the invention further relates to a resistance layer made from this resistance paste.
  • a generic resistance paste is known from DE-OS 31 48 680. US Pat. No. 3,686,139 also describes such resistance pastes and, in each case, resistance layers to be produced therefrom in several examples. In order to improve the abrasion resistance of a resistance layer with regard to a contacting sliding contact, selected curable polymers are proposed as binders for these resistance pastes.
  • DE-OS 36 38 130 shows another way of increasing the abrasion resistance in resistance layers. It improves the friction properties by adding additional agents to the resistance paste.
  • Binder of the resistance paste pigment to be dispersed is known (EP-OS 0 112 975). These are hard, refractory carrier particles, for example made of aluminum oxide, which are pyrolytically carbonized from the gas phase. With such resistance layers, the contact resistance increases after the carbonization has been abraded by the sliding contact as a result of the dielectric carrier particles. Resistance layers with particles coated with pyrolytic carbon as conductive pigment are also known from DE-AS 28 12 497, additional conductive pigments, such as carbon black, graphite, nickel, etc., being additionally added to the polymeric binder if necessary.
  • the properties of polymeric resistance layers are generally to be improved if, instead of the commonly used carbons, e.g. Carbon black or graphite, a special graphite is used.
  • the proposed special graphite is produced by chlorination of carbides at higher temperatures.
  • glass-like carbon is obtained as a powder with grain sizes below 50 ⁇ m.
  • the powdery, glass-like carbon can be used as an abrasive, as a filler to increase the slip resistance of tires, or for the production of ceramic moldings.
  • the resistance to abrasion of the resistance layer is for the life of an arrangement consisting of a resistance layer and a sliding contact interacting with the resistance layer an essential feature.
  • Non-abrasion-resistant resistance layers lose substance and thereby change their electrical value.
  • Rubbed layer influences the contact ability of the sliding contact.
  • the abrasion resistance of resistance layers that can be achieved in the prior art is not yet sufficient.
  • the object is achieved in that a glass-like carbon is used as the electrically conductive pigment.
  • the object is achieved in that the resistance layer is created from one of the proposed resistance pastes.
  • the glassy carbon used according to the invention as an electrically conductive pigment has long been known (see "Zeitschrift für Werkstofftechnik", Volume 15, pp. 331-338).
  • Glassy carbon is a very special carbon with a highly disoriented, polymeric crosslink structure and with the mechanical properties of glass. Its enormous hardness, comparable to diamond, its smooth and quasi-non-porous surface and its isotropy are outstanding properties that distinguish the glassy carbon from other amorphous or crystalline materials differentiate structured carbons.
  • laboratory devices, rotors for turbochargers in automotive engineering or even tools for processing glass are produced from glassy carbon.
  • glassy carbon as an electrically conductive pigment of a resistance paste initially appears to be of little use because of the great hardness, the grain size and the poor wettability or dispersibility which were found in the test. If you overcome these concerns and the adversities in preparation and processing, e.g. by considerably increasing the conventional effort, an abrasion-resistant resistance layer is obtained from such pigmented resistance paste. After 250 hours of stress on the resistance layer due to a sliding contact frequenting 40 Hz, no disadvantageous abrasion was discernible. This corresponds to an improvement of around a factor of 100. It has been shown that conventional binders are suitable.
  • the glassy carbon Compared to the amorphous carbon as the usual conductive pigment, the glassy carbon has a smooth, non-porous surface.
  • the stability of the electrical values of the resistance layer under the influence of moisture is improved.
  • the proportion of vitreous carbon usually varies between 5 and 80 percent by weight, based on the solids content of the binder.
  • Various options can be used individually or in combination to increase the microlinearity of the resistance layer to be produced with the paste. For example, it is advantageous to choose the grain size of the glassy carbon below 50 ⁇ m. It is particularly advantageous to use rounded or spherical glassy carbon with a mixed grain size, the average value of which, however, should be less than 30 ⁇ m.
  • Other electrically conductive pigments in particular carbon black, graphite, silver, nickel, individually or in combination, can be dispersed in. For resistance areas with a lower, specific conductivity, additional pigmentation of the resistance paste with relatively high-resistance conductive pigments is recommended due to the pigment thinning.
  • the resistivity layer to be produced with the paste has a low specific conductivity, filler pigmentation with abrasion-resistant, insulating material can be recommended. This is particularly the case when the proportion of the polymeric binder on the surface of the resistance layer produced is to be small. Titanium dioxide, iron oxide, aluminum oxide, silicon oxide, talc, kaolin, barium sulfate, zinc sulfide and others are suitable as the filler pigment.
  • vitreous carbon is carbonized before it is incorporated into the binder, i.e. coated with carbon pyrolytically obtained from the gas phase, it loses its repellent properties and can be wetted and dispersed without problems.
  • the electrical resistance layer generated from the resistance paste is abrasion-resistant and increases resistance to environmental influences.
  • the finished resistance paste is made up of the following substances: 20 parts by weight of dissolved, fully etherified melamine resin 9 parts by weight of dissolved, saturated polyester resin 10 parts by weight of dissolved, modified esterimide resin 61 parts by weight of glassy carbon 3 parts by weight of an acid catalyst.
  • the roughly mixed components of the recipe are dispersed in three passes in a three-roll mill.
  • the dispersion is subsequently adjusted to the processing viscosity. This can be achieved, for example, for screen printing processing using butyl carbitol acetate.
  • the finished paste which is set for processing, is applied as a film to an electrically insulating and temperature-compatible substrate using a screen printing device.
  • the film is cured for 1 hour at 230 ° C.
  • the resistance layer according to the invention is then completed. If a different way of processing the resistance paste is considered, eg pouring, drawing, spraying, etc., the processing viscosity must be adjusted to the selected processing.
  • a further exemplary embodiment of the invention results in resistance layers which are particularly suitable as a long-life potentiometric sensor in the fuel supply of diesel-powered internal combustion engines.
  • Another embodiment leads to resistance layers, for example for elastic substrates with improved electrical homogeneity. 8 parts by weight of phenolic resin 5 parts by weight of epoxy-modified phenolic resin 5 parts by weight of epoxy resin 8.5 parts by weight of isophorones 34.5 parts by weight of glass-like carbon, splinter-shaped, grain size ⁇ 30 ⁇ m 34.5 parts by weight of glassy carbon, spherical, grain size ⁇ 20 ⁇ m 2 parts by weight of flame black 10 parts by weight of methyl ethyl ketone
  • curable resins are also suitable as modified or combined as binders for the resistance paste or layer according to the invention.
  • Typical resins from this family are, for example, alkyds, epoxies, melamines, polyacrylates, polyesters, polyimides, polyphenols, polyurethanes and others.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Adjustable Resistors (AREA)
  • Non-Adjustable Resistors (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Conductive Materials (AREA)
  • Parts Printed On Printed Circuit Boards (AREA)

Claims (8)

  1. Pâte résistive convenant bien pour produire des couches électriquement résistives, pâte formée à partir d'un liant polymère durcissable dans lequel est incorporé en dispersion au moins un pigment électriquement conducteur et comportant des solvants, pâte caractérisée en ce que l'on utilise, à titre d'au moins un pigment électriquement conducteur, un carbone vitreux.
  2. Pâte résistive selon la revendication 1, caractérisée en ce que la proportion du carbone vitreux est de 5 à 80 % du poids de la fraction solide du liant.
  3. Pâte résistive selon la revendication 1 ou 2, caractérisée en ce que la grosseur des grains du carbone vitreux est inférieure à 50 µm.
  4. Pâte résistive selon la revendication 3, caractérisée en ce que le carbone vitreux est arrondi ou en forme de sphères.
  5. Pâte résistive selon l'une des revendications 1 à 4, caractérisée en ce que d'autres pigments électriquement conducteurs, notamment du noir de fumée, du graphite, de l'argent, du nickel sont incorporés et dispersés, isolément ou en combinaison.
  6. Pâte dispersive selon l'une des revendications 1 à 5, caractérisée en ce que des pigments isolants de charge, résistant bien à une usure par frottement, sont incorporés par dispersion dans la pâte.
  7. Pâte résistive selon l'une des revendications 1 à 6, caractérisée en ce que le carbone vitreux est recouvert de carbone pyrolytique.
  8. Couche résistive, produite à partir d'une pâte résistive selon l'une des revendications 1 à 7.
EP90108782A 1989-05-24 1990-05-10 Pâte résistive propre à la fabrication d'une résistance électrique en couche et couche résistive fabriquée à partir de celle-ci Expired - Lifetime EP0399295B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3916921 1989-05-24
DE3916921A DE3916921C1 (fr) 1989-05-24 1989-05-24

Publications (3)

Publication Number Publication Date
EP0399295A2 EP0399295A2 (fr) 1990-11-28
EP0399295A3 EP0399295A3 (fr) 1991-03-20
EP0399295B1 true EP0399295B1 (fr) 1994-08-31

Family

ID=6381316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90108782A Expired - Lifetime EP0399295B1 (fr) 1989-05-24 1990-05-10 Pâte résistive propre à la fabrication d'une résistance électrique en couche et couche résistive fabriquée à partir de celle-ci

Country Status (6)

Country Link
US (1) US5219494A (fr)
EP (1) EP0399295B1 (fr)
JP (1) JPH0311602A (fr)
AT (1) ATE110878T1 (fr)
DE (2) DE3916921C1 (fr)
ES (1) ES2062159T3 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3942799A1 (de) * 1989-12-23 1991-06-27 Bosch Gmbh Robert Verfahren zum herstellen einer abriebfesten schicht
US5111178A (en) * 1990-06-15 1992-05-05 Bourns, Inc. Electrically conductive polymer thick film of improved wear characteristics and extended life
EP0634756B1 (fr) * 1993-07-16 1998-09-30 Kabushiki Kaisha Toshiba Résistance d'oxyde de métal, résistance de puissance, et interrupteur de puissance
JP3372636B2 (ja) * 1994-03-16 2003-02-04 アルプス電気株式会社 抵抗基板の製造方法
DE19526313C2 (de) * 1995-07-19 2000-01-27 Preh Elektro Feinmechanik Diodenfassung für LED mit Steckverbindung und Vorwiderstand und Verfahren zu deren Herstellung
DE19714561C1 (de) 1997-04-09 1998-10-22 Preh Elektro Feinmechanik Verfahren zur Herstellung von pulverförmigem, glasartigen Kohlenstoff, Widerstandspaste mit diesem Kohlenstoff sowie Verwendung dieser Widerstandspaste als Widerstandsschicht
DE19821529C2 (de) * 1998-05-13 2001-05-17 Peter Hille Abriebfester elektrischer Schleifer für Potentiometer und Verfahren zu seiner Herstellung
JP3587730B2 (ja) * 1999-05-25 2004-11-10 アルプス電気株式会社 抵抗体及びその抵抗体を用いた可変抵抗器
JP3699864B2 (ja) 1999-08-02 2005-09-28 アルプス電気株式会社 導電性樹脂組成物及びそれを用いたエンコーダスイッチ
US6630080B2 (en) 2000-02-25 2003-10-07 Alps Electric Co., Ltd. Conductive resin composition and encoder switch using the same
DE10116648B4 (de) * 2001-04-04 2006-01-26 Preh Gmbh Widerstandspaste sowie Verwendung dieser Widerstandspaste als Widerstandsschicht
US20040113127A1 (en) * 2002-12-17 2004-06-17 Min Gary Yonggang Resistor compositions having a substantially neutral temperature coefficient of resistance and methods and compositions relating thereto
US7112755B2 (en) * 2003-05-21 2006-09-26 Nitta Corporation Pressure-sensitive sensor
JP5561174B2 (ja) * 2009-02-16 2014-07-30 株式会社村田製作所 導電性樹脂組成物、それを用いた電子部品の製造方法、接合方法、接合構造、および電子部品

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2405449A (en) * 1943-12-31 1946-08-06 Sprague Electric Co Electrical resistance element
US3686139A (en) * 1970-03-10 1972-08-22 Globe Union Inc Resistive coating compositions and resistor elements produced therefrom
US3930821A (en) * 1975-01-27 1976-01-06 Corning Glass Works Process for making carbon-containing glass resistors
US3930822A (en) * 1975-01-27 1976-01-06 Corning Glass Works Process for making carbon-containing glass resistors
DE2718380C2 (de) * 1977-04-26 1985-01-17 GOK Regler- und Armaturen GmbH & Co KG, 5200 Siegburg Heizölfilter
DE2812497C3 (de) * 1978-03-22 1982-03-11 Preh, Elektrofeinmechanische Werke, Jakob Preh, Nachf. Gmbh & Co, 8740 Bad Neustadt Gedruckte Schaltung
US4271045A (en) * 1978-06-13 1981-06-02 Steigerwald Wolf Erhard Electrically conductive layer and method for its production
DE3148680C2 (de) * 1981-12-09 1983-11-03 Preh, Elektrofeinmechanische Werke, Jakob Preh, Nachf. Gmbh & Co, 8740 Bad Neustadt Elektrische Widerstandspaste
ATE21291T1 (de) * 1982-11-25 1986-08-15 Preh Elektro Feinmechanik Einrichtung zur erfassung einer x-y-position.
DE3246412A1 (de) * 1982-12-15 1984-06-20 Preh, Elektrofeinmechanische Werke Jakob Preh Nachf. Gmbh & Co, 8740 Bad Neustadt Fluessigkeitsempfindliches element
DD213782A1 (de) * 1983-03-07 1984-09-19 Elektronische Bauelemente Veb Widerstandsmaterial zur herstellung polymerer schichtsysteme
EP0121781B1 (fr) * 1983-03-09 1989-04-12 Kao Corporation Procédé pour la production de matériau vitreux en charbon
US4600602A (en) * 1984-07-18 1986-07-15 Rohm And Haas Company Low resistance resistor compositions
JPS62112641A (ja) * 1985-11-11 1987-05-23 Nitta Kk 感圧導電性エラストマ−組成物
DE3638130A1 (de) * 1986-11-08 1988-05-19 Preh Elektro Feinmechanik Elektrische leit- oder widerstandspaste
US5111178A (en) * 1990-06-15 1992-05-05 Bourns, Inc. Electrically conductive polymer thick film of improved wear characteristics and extended life

Also Published As

Publication number Publication date
DE3916921C1 (fr) 1990-10-11
ATE110878T1 (de) 1994-09-15
DE59006946D1 (de) 1994-10-06
EP0399295A3 (fr) 1991-03-20
ES2062159T3 (es) 1994-12-16
EP0399295A2 (fr) 1990-11-28
JPH0311602A (ja) 1991-01-18
US5219494A (en) 1993-06-15

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