EP1342250A2 - Elektrisches bauelement und verfahren zu dessen herstellung - Google Patents
Elektrisches bauelement und verfahren zu dessen herstellungInfo
- Publication number
- EP1342250A2 EP1342250A2 EP01990291A EP01990291A EP1342250A2 EP 1342250 A2 EP1342250 A2 EP 1342250A2 EP 01990291 A EP01990291 A EP 01990291A EP 01990291 A EP01990291 A EP 01990291A EP 1342250 A2 EP1342250 A2 EP 1342250A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- intermediate layer
- base body
- protective layer
- solvent
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
- H01C1/028—Housing; Enclosing; Embedding; Filling the housing or enclosure the resistive element being embedded in insulation with outer enclosing sheath
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
Definitions
- the invention relates to an electrical component with a base body, at least two connection elements connected to the base body and with a protective layer.
- the invention also relates to a method for producing the component.
- the base body of which is made of a ceramic material with a positive temperature coefficient of ohmic resistance.
- the base body of the known components is covered with a protective layer containing organic components.
- Such components are usually used as a PCT resistor.
- donor- and acceptor-doped barium titanate is used as the ceramic material.
- the protective layer is usually applied to the by a dip painting process
- the organic solvent such as Contains xylene or acetol ester and organic binders.
- the intermediate layer serves to absorb stress forces which act on the base body due to different coefficients of thermal expansion of the electrical base body and the protective layer.
- the intermediate layer can consist of a solvent-containing material, the solvent content of which has been evaporated by heating after the material has been applied to the base body.
- a PTC thermistor which is surrounded by a housing, the material of which is free of nucleophiles. This can prevent a chemical reaction of the housing material with the base body of the PTC thermistor.
- the housing is encapsulated by a potting material.
- the quality of the PTC resistors is assessed, among other things, by their voltage storage stability.
- the voltage storage stability indicates which electrical voltage the PTC resistor can withstand over a longer period of time, for example 24 hours, without losing its characteristic properties. Due to the applied voltage, a current flows through the PTC resistor, which heats it up.
- the voltage storage stability of the PTC resistor is thus closely linked to its temperature stability. Since chemical processes with considerable time constants play a role in the assessment of the stability of a PTC resistor, an electrical voltage applied only over a short period of time is not meaningful for assessing the stability.
- the known components have the disadvantage that the lacquer applied as a protective layer has a relatively high layer thickness of between 10 and 500 ⁇ m due to the dip coating process. Therefore, when the paint dries, there are encrusted surfaces on the surface, while inside the paint there is still a portion of organic constituents, which is prevented by the encrusted surfaces from leaving the paint completely in the further course of the drying process.
- the protective layer of the known components contains a rest of organic components. These components can reach the base body and, if the temperature of the component exceeds 220 ° C. due to a high voltage applied, can lead to a chemical reaction that depolarizes the grain boundaries of the ceramic. This destroys the ceramic's PTC effect, causing the component to become damaged rr
- Such a suitable thickness, which is necessary for the protective function of the protective layer, is between 10 and 500 ⁇ m.
- a suitable layer thickness for the intermediate layer is in the range between 5 and 100 ⁇ m.
- the invention specifies a method for producing an electrical component, the component comprising a base body which is in contact with at least two connection elements and has on its surface an intermediate layer made of a solvent-containing starting material, and the base body during the application the intermediate layer is heated by means of an electric current flowing through it.
- Heating the base body during the application of the intermediate layer has the advantage that the solvent contained in the starting material can easily volatilize, as a result of which the solvent content of the intermediate layer and thus also the effects of the solvent on the surface of the base body can be reduced.
- the method according to the invention is particularly suitable for producing the intermediate layer of the component according to the invention.
- the starting material can be applied particularly advantageously by spraying to produce the intermediate layer on the surface of the base body. All common spraying methods are conceivable, for example also air brush.
- the spraying of the starting material enables a continuous, thin application of the intermediate layer, in particular a layer application with a homogeneous layer thickness is also possible. Because the intermediate layer grows very slowly when applied by spraying, the content of solvent can evaporate easily during the application of the intermediate layer.
- the intermediate layer by means of spraying, it is easily possible to enclose the base body of the component on all sides with the intermediate layer, as a result of which the access to moisture or solvent of a protective layer arranged on the intermediate layer is effectively reduced to the base body.
- the base body is heated to a temperature which causes at least 90% of the solvent content of the starting material to evaporate during the application of the intermediate layer. This ensures that the intermediate layer contains only a very small proportion of solvent.
- the layer application can be made more uniform by stabilizing the actual temperature of the base body during the application of the intermediate layer in such a way that it deviates by less than 10% from a suitable target temperature. This ensures that the temperature of the base body is on the one hand so high at any point in time of the layer application that sufficient solvent evaporates and on the other hand the temperature is so low that the intermediate layer or the base body is not thermally damaged.
- a base body whose U-I characteristic curve has at least one maximum can advantageously be used in the method. Then it is then possible to produce the electrical current flowing through the base body by applying an electrical voltage to the connection elements which lies in a range of negative slope of the U-I characteristic curve.
- a base body made of a PTC thermistor ceramic, for example, can be considered as the base body, the U-I characteristic curve of which has at least one maximum.
- the selection of an electrical voltage which lies in a range of negative slope of the U-I characteristic curve is known in PTC thermistors under the term "tilting".
- a suitable material for the ceramic with a positive temperature coefficient is, for example, donor-doped barium titanate or a (V, Cr) 2O3 ceramic.
- the base body When using a base body made of a thermistor ceramic, the base body can be heated to a temperature between 140 and 150 ° C by a current between 1 and 2 A. Such a temperature is suitable, for example, for spraying on a layer of silicate lacquer.
- a protective layer can be applied to the intermediate layer from the same starting material using a different method, for example dipping.
- a protective layer can be made thicker than the intermediate layer and is then suitable as a protective layer against external influences.
- the intermediate layer can be applied to the base body in particular on all sides and thus effectively protect the base body from further solvent-containing outer layers.
- FIG. 1 shows an example of a component according to the invention in a schematic cross section.
- FIG. 2 shows an example of the U-I characteristic curve of the component from FIG. 1.
- FIG. 3 shows an example of a component during the application of a layer using the method according to the invention in a schematic cross section.
- FIG. 1 shows a PTC resistor with a disk-shaped base body 1, which consists of a suitable ceramic.
- a first contact area 2 is provided on the underside of the base body 1, which can consist, for example, of a silver baking paste.
- a first connection element 4 is fastened to the first contact area 2, which may be a wire, for example. The wire is preferably attached to the first contact area 2 by soldering.
- a second contact area 3 is arranged on the top of the base body 1, which in turn can consist of a silver baking paste. In the same way as on the first contact area 2, a second connection element 5 in the form of a soldered wire is fastened on the second contact area 3.
- the base body 1 is covered by a protective layer 6, which has a thickness of 10 to 500 ⁇ m and which consists of a solvent-containing lacquer. Furthermore, the base body 1 is encased by an intermediate layer 7 arranged within the protective layer 6, which is between 5 and 20 ⁇ m thick and which has only a very small proportion of solvent.
- the connection elements 4, 5 have end sections 8, 9, which are not covered by either of the two layers 6, 7, so that they can serve for electrical contacting of the component.
- a number of 20 of the components shown in FIG manufactured as follows: A PTC component was heated by a current of 1 to 2 A to a temperature between 140 and 150 ° C. After the temperature had stabilized, an intermediate layer 6 was applied by spraying on silicate varnish with the aid of an air brush. A protective layer 7 was then produced by immersing the PTC, which had meanwhile cooled again, in silicate lacquer and then drying it.
- the silicate varnish from Reichold was used to produce the protective layer, which experience has shown to reduce the voltage storage stability to a particular extent.
- the storage components were tested at 20 V AC for a period of 24 hours. No failures were observed in the components according to the invention after this voltage storage test, while seven failures were observed in the components without an intermediate layer. This clearly shows the positive effect of the intermediate layer according to the invention.
- the UI characteristic curve according to FIG. 2 has a maximum at a breakdown voltage UR.
- U j ⁇ the PTC thermistor can be “tilted”, which means that with increasing voltage U the current I flowing through the PTC thermistor decreases and the electrical power converted in the component can thus be stabilized.
- FIG. 3 shows the implementation of the method according to the invention, an electrical current I flowing through a basic body 1 made of a thermistor ceramic, which is provided with connecting elements 4 and 5.
- This electrical current I heats the basic body 1 to a temperature above the room temperature.
- Silicate varnish can now be sprayed onto the surface of the base body 1 by means of a nozzle 11, so that a layer 10 is formed which contains very little solvent due to the evaporation.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10062293A DE10062293A1 (de) | 2000-12-14 | 2000-12-14 | Elektrisches Bauelement und Verfahren zu dessen Herstellung |
DE10062293 | 2000-12-14 | ||
PCT/DE2001/004688 WO2002049047A2 (de) | 2000-12-14 | 2001-12-13 | Elektrisches bauelement und verfahren zu dessen herstellung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1342250A2 true EP1342250A2 (de) | 2003-09-10 |
EP1342250B1 EP1342250B1 (de) | 2007-05-23 |
Family
ID=7667106
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01990291A Expired - Lifetime EP1342250B1 (de) | 2000-12-14 | 2001-12-13 | Elektrisches bauelement und verfahren zu dessen herstellung |
Country Status (8)
Country | Link |
---|---|
US (1) | US6933829B2 (de) |
EP (1) | EP1342250B1 (de) |
JP (1) | JP5064642B2 (de) |
CN (1) | CN1288672C (de) |
AT (1) | ATE363127T1 (de) |
DE (2) | DE10062293A1 (de) |
TW (1) | TW563137B (de) |
WO (1) | WO2002049047A2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006053085A1 (de) * | 2006-11-10 | 2008-05-15 | Epcos Ag | Elektrische Baugruppe mit PTC-Widerstandselementen |
DE102006053081A1 (de) | 2006-11-10 | 2008-05-15 | Epcos Ag | Elektrische Baugruppe mit PTC-Widerstandselementen |
JP2017524270A (ja) | 2014-08-08 | 2017-08-24 | ドングアン・リテルヒューズ・エレクトロニクス・カンパニー・リミテッド | 多層被覆を有するバリスタ及び製造方法 |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE51956C (de) | ILLGEN & LUDWIG in Berlin N., Fehrbellinerstr. 14 | Druckminderer mit durch Keilfläche verschobenem Abschlufsventile | ||
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 |
US3670091A (en) * | 1971-05-20 | 1972-06-13 | Sqrague Electric Co | Encapsulated electrical components with protective pre-coat containing collapsible microspheres |
US3824328A (en) * | 1972-10-24 | 1974-07-16 | Texas Instruments Inc | Encapsulated ptc heater packages |
US4001655A (en) * | 1974-01-10 | 1977-01-04 | P. R. Mallory & Co., Inc. | Compressible intermediate layer for encapsulated electrical devices |
US4039904A (en) * | 1976-01-02 | 1977-08-02 | P. R. Mallory & Co., Inc. | Intermediate precoat layer of resin material for stabilizing encapsulated electric devices |
US4804805A (en) | 1987-12-21 | 1989-02-14 | Therm-O-Disc, Incorporated | Protected solder connection and method |
JPH0687021B2 (ja) * | 1988-10-29 | 1994-11-02 | 日本碍子株式会社 | 検出素子の製造法 |
DE4029681A1 (de) * | 1990-09-19 | 1992-04-02 | Siemens Ag | Verfahren zum herstellen von oberflaechenmontierbaren keramischen bauelementen in melf-technologie |
JPH09205005A (ja) * | 1996-01-24 | 1997-08-05 | Matsushita Electric Ind Co Ltd | 電子部品とその製造方法 |
JP3344684B2 (ja) * | 1996-05-20 | 2002-11-11 | 株式会社村田製作所 | 電子部品 |
-
2000
- 2000-12-14 DE DE10062293A patent/DE10062293A1/de not_active Withdrawn
-
2001
- 2001-12-10 TW TW090130507A patent/TW563137B/zh not_active IP Right Cessation
- 2001-12-13 WO PCT/DE2001/004688 patent/WO2002049047A2/de active IP Right Grant
- 2001-12-13 CN CN01820529.1A patent/CN1288672C/zh not_active Expired - Lifetime
- 2001-12-13 EP EP01990291A patent/EP1342250B1/de not_active Expired - Lifetime
- 2001-12-13 US US10/450,593 patent/US6933829B2/en not_active Expired - Lifetime
- 2001-12-13 JP JP2002550266A patent/JP5064642B2/ja not_active Expired - Fee Related
- 2001-12-13 DE DE50112532T patent/DE50112532D1/de not_active Expired - Lifetime
- 2001-12-13 AT AT01990291T patent/ATE363127T1/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO0249047A3 * |
Also Published As
Publication number | Publication date |
---|---|
TW563137B (en) | 2003-11-21 |
DE50112532D1 (de) | 2007-07-05 |
ATE363127T1 (de) | 2007-06-15 |
JP5064642B2 (ja) | 2012-10-31 |
WO2002049047A3 (de) | 2003-05-08 |
JP2004516647A (ja) | 2004-06-03 |
CN1288672C (zh) | 2006-12-06 |
US6933829B2 (en) | 2005-08-23 |
CN1481560A (zh) | 2004-03-10 |
US20040090303A1 (en) | 2004-05-13 |
WO2002049047A2 (de) | 2002-06-20 |
DE10062293A1 (de) | 2002-07-04 |
EP1342250B1 (de) | 2007-05-23 |
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