EP1342250A2 - Electrical component and method for producing the same - Google Patents

Electrical component and method for producing the same

Info

Publication number
EP1342250A2
EP1342250A2 EP20010990291 EP01990291A EP1342250A2 EP 1342250 A2 EP1342250 A2 EP 1342250A2 EP 20010990291 EP20010990291 EP 20010990291 EP 01990291 A EP01990291 A EP 01990291A EP 1342250 A2 EP1342250 A2 EP 1342250A2
Authority
EP
Grant status
Application
Patent type
Prior art keywords
intermediate layer
base body
method
protective layer
layer
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
EP20010990291
Other languages
German (de)
French (fr)
Other versions
EP1342250B1 (en )
Inventor
Harald SCHÖPF
Thomas Trenkler
Chong Wang
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.)
Epcos AG
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

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01CRESISTORS
    • H01C1/00Details
    • H01C1/02Housing; Enclosing; Embedding; Filling the housing or enclosure
    • H01C1/028Housing; Enclosing; Embedding; Filling the housing or enclosure the resistive element being embedded in insulation with outer enclosing sheath
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01CRESISTORS
    • H01C1/00Details
    • H01C1/02Housing; Enclosing; Embedding; Filling the housing or enclosure

Abstract

The invention relates to an electrical component with a base (1), at least two connecting elements (4, 5) linked with the base (1), an intermediate layer (6) disposed on the surface of the base (1), and a protective layer (7) disposed on the intermediate layer (6). The intermediate layer (6) and the protective layer (7) are produced from the same solvent-containing starting material, with the intermediate layer (6) having a lower solvent content than the protective layer (7). The invention further relates to a method for producing such a component. It is especially advantageous to apply the intermediate layer (6) by spraying it onto the heated base (1) of the component, thereby increasing the voltage stability of the PTC thermistor.

Description

description

The electrical component and method for its production

The invention relates to an electrical component comprising a base body, at least two with the basic body connection elements and associated with a protective layer. Moreover, the invention relates to a method for manufacturing the component.

There are known electrical components of the type mentioned, the base body made of a ceramic material with a positive temperature coefficient of the ohmic resistance. In addition, the base body of the known devices with a organic components is wrapped containing protective layer. Such devices are commonly used as a PCT resistor. In this case barium titanate is used as ceramic material, for example, donor-and Acceptor used. The protective layer is a customary SHORT- by a dip coating on the

includes base body applied, dried paint, the organic solvent such as xylene or Acetolester and organic binder.

From the document DE 25 00 789 AI electrical components with a compressible intermediate layer are known, on which a protective layer is applied. The intermediate layer serves to trap tension forces acting body and the protective layer to the base body due to different thermal expansion coefficients of electrical ground. The intermediate layer may consist of a solvent ittelhaltigen material whose Lδsungsmittelanteil was evaporated after application of the material onto the base body by heating.

From patent specification DE 51 956 C2, a PTC thermistor is known which is surrounded by a housing, the material is free of nucleophiles. This can prevent the main body of the cold head of a chemical reaction of the housing material. The housing is encapsulated by a potting material.

The PTC resistors are evaluated for quality including through its voltage storage stability. The power storage stability indicates that electric voltage of the PTC resistance over a longer period, for example 24 hours, can withstand without losing its characteristic properties. Due to the applied voltage, a current flows through the PTC resistor, which heats it. Thus, the voltage storage stability of the PTC resistance is closely linked to its temperature stability. Since, among other chemical processes with significant time constants play a role in assessing the stability of a PTC-resistor, a voltage applied only for a short time electric voltage to assess the stability is not meaningful.

The known devices have the disadvantage that the applied as a protective layer coating having a relatively high layer thickness of between 10 and 500 microns because of the Tauchlackierverfahrens. Therefore produced during drying of the paint on the surface encrusted surfaces, while the interior of the paint, a proportion of organic components is still present, which is prevented in the further course of the drying process by the crusted surface at the exit completely the varnish.

Therefore, the protective layer of the known devices containing a residue of organic constituents. These ingredients may reach the base body and there, if the temperature of the device exceeds 220 ° C due to a high applied voltage, lead to a chemical reaction which depolarizes the grain boundaries of the ceramic. Thus, the PTC effect of the ceramic is destroyed, causing the component rr

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layer can be produced with the appropriate thickness for the device.

One such suitable thickness, which is necessary for the protective function of the protective layer is between 10 and 500 microns. A suitable film thickness for the intermediate layer is in the range between 5 and 100 microns.

Furthermore, the invention provides a method for producing an electrical component, wherein the device comprises a base body which is contacted with at least two connecting elements and has on its surface an intermediate layer made of a solvent-containing starting material and wherein the base body during the construction bringens the intermediate layer is heated by a current flowing through it the electric current.

The heating of the base body during the application of the intermediate layer has the advantage that the solvent contained in the starting material can easily volatilize, whereby the solvent content of the intermediate layer and thus the effects of the solvent on the surface of the base body can be reduced.

In particular, the inventive method for making the intermediate layer of the device according to the invention is suitable.

The starting material can be particularly advantageously applied for forming the intermediate layer on the surface of the basic body by spraying. All conventional spray methods are conceivable, for example, air brush. The spraying of the starting material enables a continuous, thin application of the intermediate layer, in particular, can also be a layer coating having a homogeneous film thickness. Characterized in that the intermediate layer grows very slowly when applied by spraying, the content of the solvent may easily evaporate during application of the intermediate layer.

Furthermore, it is by applying the intermediate layer by spraying readily possible to enclose the basic body of the component on all sides with the intermediate layer, whereby the ingress of moisture or solvent, arranged on the intermediate layer protective layer the base body is effectively reduced.

In the application of the intermediate layer by means of spraying, it is particularly advantageous if the base body is heated to a temperature which causes at least 90% of the solvent content of the starting material during the Aufbrin- gens evaporate the intermediate layer. This ensures that the intermediate layer contains only a very small proportion of solvent.

An equalization of the coating application can be performed, in- which the actual temperature of the base body is stabilized during the application of the intermediate layer such that it deviates by less than 10% of a suitable desired temperature. Thereby, it is ensured that at any time of coating application, the temperature of the base body is so high on the one hand, that sufficient evaporated much of the solvent and on the other hand, the temperature is so low that the intermediate layer or the base body is not thermally damaged.

It can be used advantageously in the method, a base body, the UI characteristic has at least one maximum. Then that it is possible to cause the current flowing through the base electric current by applying an electric voltage to the terminal elements, which is in a range of negative slope of the UI characteristic.

Due to the negative slope of the characteristic curve, an increase of the voltage causes a decrease in the component of the fließen- the current, which has a stabilizing effect on the converted electric power P, and thus also on the temperature of the device or the base body.

As a basic body, the UI characteristic has at least a maximum, for example, is a base body of a PTC ceramic into consideration. Choosing an electric voltage, which is in a range of negative slope of the UI characteristic is known for PTC thermistors, the term "tilting".

As a suitable material for the ceramic positive temperature coefficient, for example, donor-doped barium titanate or a (V, Cr) 2O3 ceramic comes into consideration.

When using a base body of a PTC ceramic of the base body can be heated by a current 1-2 A at a temperature between 140 and 150 ° C. Such a temperature is, for example, suitable for spraying a layer of silicate paint.

On the intermediate layer may be made of the same starting material, a protective layer with a different method, such as dipping, may be applied. Such a protective layer can be made thicker than the intermediate layer and is suitable as a protective layer against external influences.

By spraying the starting material onto the base body, the intermediate layer can be applied in particular on all sides enclosing the base body and thus protect the body against further effective solvent-containing outer layers.

In the following the invention will be explained with reference to exemplary embodiments and the associated figures. 1 shows an example of a component of the invention in schematic cross section.

Figure 2 shows an example of the UI characteristic of Bauele- ment of FIG. 1

Figure 3 shows an example of a component during the construction bringing a layer using the method according to the invention in schematic cross section.

1 shows a PTC resistor with a disk-shaped basic body 1, which consists of a suitable ceramic. On the underside of the base body 1, a first contact portion 2 is provided, which can for example consist of a silver baking paste. At the first contact portion 2, a first connector element 4 is fixed, which may be for example a wire. The attachment of the wire to the first contact portion 2 is preferably carried out by soldering. On top of the base body 1, a second contact portion 3 is arranged, which in turn may consist of a silver baking paste. In the same manner as on the first contact portion 2, a second connecting element is fixed in the form of a soldered wire 5 on the second contact region. 3

The base body 1 is covered by a protective layer 6 having a thickness of 10 to 500 microns and consisting of a lδ- sungsmittelhaltigen varnish. Further, the basic body 1 of a arranged within the protective layer 6 intermediate layer 7 is coated, the thickness is between 5 and 20 microns and which has only a very small proportion of solvent. The connecting elements 4, 5 have end portions 8, 9 which are enclosed by neither of the two layers 6, 7 so that they can serve for the electrical contacting of the device.

In one embodiment of the invention, a number of 20 of the components shown in Figure 1 was prepared as follows: There was a PTC device is heated by a current of 1 to 2 A to a temperature between 140 and 150 ° C. After stabilizing the temperature of an intermediate layer was applied by spraying of silicate paint with the aid of air brush. 6 Subsequently, a protective layer 7 by immersing the now cooled again in PTC silicate coating and then drying was produced.

There were also as comparative samples 20 devices according to the figure 1, but without an intermediate layer.

For both the embodiments of the invention and for the comparative samples of the silicate paint Reichold was used to make the protective layer, which lowers the voltage storage stability according to experience to a particular degree.

storage devices was tested at 20 V alternating voltage for a period of 24 hours. The erfindungsge- MAESSEN components no failures were observed after this voltage storage test, whereas the components without an intermediate layer seven failures were observed. This shows clearly the positive effect of the intermediate layer according to the invention.

The UI characteristic according to figure 2 has a maximum at a tilt-voltage UR. Can for voltages U> U, the PTC thermistor to be "tipped", which means that at rising voltage U of the current flowing through the PTC current I decreases and thus the unreacted component in the electric power can be stabilized.

Figure 3 shows the implementation of the inventive method, wherein a base body 1 made of a PTC ceramic, which is provided with connecting elements 4 and 5, is traversed by an electrical current I. This electrical current I heats the base body 1 to a temperature above room temperature. By means of a nozzle 11 silicate paint can be sprayed onto the surface of the base body 1 is now, so that a layer 10 is formed which contains due to evaporation only very little solvent.

Claims

claims
1. PTC with
- a base body (1), - connected to at least two with the base body (1) connecting elements (4, 5), arranged one on the surface of the base body (1) intermediate layer (6) and a on the intermediate layer (6) arranged protective layer (7)
- wherein the intermediate layer (6) and the protective layer (7) each of the same, a solvent-containing lacquer are prepared, wherein the solvent the electrical characteristics of the device adversely affected and - in which the intermediate layer (6) has a smaller solvent content as the protective layer (7).
2. The component according to claim 1, wherein the thickness of the intermediate layer (6) is between 5 and 100 microns.
3. The component according to claim 1,
- in which the thickness of the protective layer (7) is between 10 and 500 microns.
4. A process for producing a PTC thermistor with a main body (1) provided with at least two connecting elements
(4, 5) is contacted, comprising the steps of:
A) A composition consisting of a solvent-containing lacquer
Intermediate layer (6) on the base body (1), wherein this during the application of the intermediate layer by means of a current flowing through it the electric current (I) is heated so that at least 90% of the Lösungsmittelan- (part of the paint during the application of the intermediate layer evaporate 6). B) A protective layer (7) which consists of a solvent-containing lacquer is created on the intermediate layer (6).
5. The method of claim 4, wherein the intermediate layer is applied by spraying onto the base body (1).
6. The method of claim 4 or 5, wherein a basic body (1) is used, having the UI characteristic at least a maximum, and wherein the through the base body (1) flowing electrical current (I) by applying an electrical voltage (U) hervorgeru - is fen, which is in a range of negative slope of the UI characteristic, so that the actual temperature of the base body (1) during the application of the intermediate layer (6) is stabilized so as to less than 10% of a target different temperature.
7. The method of claim 4 to 6, wherein the base body (1) is heated to a temperature between 140 and 150 ° C.
8. The method of claim 4 to 7,
- wherein the protective layer (7) is applied from the same starting material as the intermediate layer (6) in method step B).
9. The method of claim 8, wherein the protective layer (7) is applied by dipping in a liquid.
10. The method of claim 4 to 9, - wherein the intermediate layer is applied so that it encloses the basic body (1) on all sides.
EP20010990291 2000-12-14 2001-12-13 Electrical component and method for producing the same Active EP1342250B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE10062293 2000-12-14
DE2000162293 DE10062293A1 (en) 2000-12-14 2000-12-14 The electrical component and method for its production
PCT/DE2001/004688 WO2002049047A3 (en) 2000-12-14 2001-12-13 Electrical component and method for producing the same

Publications (2)

Publication Number Publication Date
EP1342250A2 true true EP1342250A2 (en) 2003-09-10
EP1342250B1 EP1342250B1 (en) 2007-05-23

Family

ID=7667106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010990291 Active EP1342250B1 (en) 2000-12-14 2001-12-13 Electrical component and method for producing the same

Country Status (6)

Country Link
US (1) US6933829B2 (en)
EP (1) EP1342250B1 (en)
JP (1) JP5064642B2 (en)
CN (1) CN1288672C (en)
DE (2) DE10062293A1 (en)
WO (1) WO2002049047A3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006053085A1 (en) 2006-11-10 2008-05-15 Epcos Ag Electrical assembly with PTC resistance elements
DE102006053081A1 (en) 2006-11-10 2008-05-15 Epcos Ag Electrical assembly with PTC resistance elements
WO2016019569A1 (en) * 2014-08-08 2016-02-11 Dongguan Littelfuse Electronics, Co., Ltd Varistor having multilayer coating and fabrication method

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DE51956C (en)
US2664324A (en) * 1948-10-14 1953-12-29 Skf Ind Inc Multirow cylindrical roller bearing with removable inner assembly
US2558798A (en) * 1948-10-18 1951-07-03 Meivin A Thom Electrical resistor
US2664364A (en) * 1949-02-15 1953-12-29 Melvin A Thom Process for drying coated resistors
US2649424A (en) * 1950-10-11 1953-08-18 Battelle Development Corp Protective coating material
US2731312A (en) * 1950-11-01 1956-01-17 Bendix Aviat Corp Brake assembly
US2640132A (en) * 1951-03-27 1953-05-26 Thom Melvin Arnold Electrical resistor and method of making same
US2725312A (en) * 1951-12-28 1955-11-29 Erie Resistor Corp Synthetic resin insulated electric circuit element
US2741687A (en) * 1953-08-21 1956-04-10 Erie Resistor Corp Pyrolytic carbon resistors
US3562007A (en) * 1968-04-25 1971-02-09 Corning Glass Works Flame-proof,moisture resistant coated article and process of making same
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US3824328A (en) * 1972-10-24 1974-07-16 Texas Instruments Inc Encapsulated ptc heater packages
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Also Published As

Publication number Publication date Type
JP5064642B2 (en) 2012-10-31 grant
US6933829B2 (en) 2005-08-23 grant
DE50112532D1 (en) 2007-07-05 grant
WO2002049047A3 (en) 2003-05-08 application
CN1288672C (en) 2006-12-06 grant
US20040090303A1 (en) 2004-05-13 application
EP1342250B1 (en) 2007-05-23 grant
DE10062293A1 (en) 2002-07-04 application
WO2002049047A2 (en) 2002-06-20 application
CN1481560A (en) 2004-03-10 application
JP2004516647A (en) 2004-06-03 application

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