DE2951296A1 - Heat transmissive electrical insulator layer - has barrel-shaped conducting sections in sheet with plastics spacers and coating - Google Patents

Heat transmissive electrical insulator layer - has barrel-shaped conducting sections in sheet with plastics spacers and coating

Info

Publication number
DE2951296A1
DE2951296A1 DE19792951296 DE2951296A DE2951296A1 DE 2951296 A1 DE2951296 A1 DE 2951296A1 DE 19792951296 DE19792951296 DE 19792951296 DE 2951296 A DE2951296 A DE 2951296A DE 2951296 A1 DE2951296 A1 DE 2951296A1
Authority
DE
Germany
Prior art keywords
insulating body
thermally conductive
conductive particles
barrel
insulating
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
DE19792951296
Other languages
German (de)
Other versions
DE2951296C2 (en
Inventor
Hans 7900 Ulm Bendig
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.)
Thales Electron Devices GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE19792951296 priority Critical patent/DE2951296A1/en
Publication of DE2951296A1 publication Critical patent/DE2951296A1/en
Application granted granted Critical
Publication of DE2951296C2 publication Critical patent/DE2951296C2/de
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
    • H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
    • H01L23/3733—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon having a heterogeneous or anisotropic structure, e.g. powder or fibres in a matrix, wire mesh, porous structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies
    • H01B17/62—Insulating-layers or insulating-films on metal bodies
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
    • H05K7/20436—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing
    • H05K7/20445—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing the coupling element being an additional piece, e.g. thermal standoff
    • H05K7/20454—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing the coupling element being an additional piece, e.g. thermal standoff with a conformable or flexible structure compensating for irregularities, e.g. cushion bags, thermal paste
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Thermal Sciences (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
  • Laminated Bodies (AREA)

Abstract

An electrical insulating but heat transmitting sheet is sandwiched between conducting materials, typically between a transistor and the heat sink where insulation is required but with excellent heat transfer properties. The material is flexible and suitable for uneven surfaces. The heat conducting parts (2) are rigid, pressure resistant barrel-shaped ceramics made of aluminium oxide, titanium oxide or beryllium oxide. They are separated from each other by disc inserts (1) of a synthetic soft PU material or a type of PTFE. The covering material (3) covers both sides over the tops of the barrel parts and the spacing discs (1) which are of like thickness so that the top and bottom covers (3) form a flat area.

Description

eschreibungdescription

Isolierkörper Die vorliegende Erfindung betrifft einen flächenhaft ausgebildeten Isolierkörper zur Zwischenfügung zwischen elektrisch leitende Oberflächen und zur Erzielung eines Wärmeüberganges zwischen den elektrisch leitenden Oberflächen, der aus einem flexiblen Isolierstoff mit eingelagerten wärmeleitenden Teilchen besteht.Insulating body The present invention relates to a planar trained insulating body for interposition between electrically conductive surfaces and to achieve heat transfer between the electrically conductive surfaces, which consists of a flexible insulating material with embedded heat-conducting particles.

Bei einer Vielzahl von technischen Vorrichtungen ist es erwünscht, zwei metallische Teile gegeneinander elektrisch zu isolieren und gleichzeitig einen guten Wärmeübergang zwischen den beiden metallischen Teilen zu erhalten. Solche Probleme treten beispielsweise auf, wenn es gilt, Verlustwärme von elektrischen Elektroden, wie Kollektorelektroden von Wanderfeldröhren oder Kollektorelektroden von Transistoren abzuführen.In the case of a large number of technical devices, it is desirable to electrically isolate two metallic parts from each other and at the same time one to get good heat transfer between the two metallic parts. Such Problems arise, for example, when it comes to heat loss from electrical Electrodes, such as the collector electrodes of traveling wave tubes or collector electrodes dissipate from transistors.

Für diesen Zweck sind z. 13. Keramikteiie1Glimmerplättchen oder auch Verbundwerkstoffe mit vorwiegend irregulär eingelagerten wärmeleitenden Teilchen gebräuchlich.For this purpose z. 13. Ceramic parts, or mica platelets Composite materials with predominantly irregularly embedded thermally conductive particles common.

Aufgabe der vorliegenden Erfindung ist es,' einen neuartigen isolierkörper der eingangs genannten Art anzugeben, der vielfältig einsetzbar ist, bezüglich der gewünschten Größe leicht einsetzbar ist und der auch bei gewölbten Flächen einsetzbar ist.The object of the present invention is to provide a novel insulating body specify the type mentioned, which can be used in many ways, with respect to desired size is easy to use and can also be used on curved surfaces is.

Gemäß der Erfindung wird vorgeschlagen, daß die wärmeleitender Teilchen tonnenartig ausgebildet sind und ihre beiden Deckflächen jeweils Teile der beiden Oberflächen des Isolierkörpers bilden.According to the invention it is proposed that the thermally conductive particles are barrel-shaped and their two top surfaces each part of the two Form surfaces of the insulator.

Der beschriebene Isolierkörper gewährleistet einen guten Wärmeübergang zwischen den metallischen Flächen. Er läßt sich in einfacher Weise auf die gewünschte Größe zuschneiden, er ist flexibel und er hält verhältnismäßig große Drucke und Beschleunigungskräfte aus.The insulating body described ensures good heat transfer between the metallic surfaces. It can be easily adjusted to the desired Crop to size, it's flexible and it holds prints and relatively large Acceleration forces.

Gemäß ß einer Weiterbildung der Erfindung wird ein Verfahren zum Herstellen eines solchen Isolierkörpers angegeben, das darin besteht, daß eine einlagige Schicht von Kugeln etwa gleicher Größe auf einen Träger aufgebracht wird und dann diese einlagige Schicht in einen flexiblen Kunststoff eingegossen wird. Anschließend wird dann eine materialabhebende Bearbeitung der beiden Oberflächen vorgenommen, beispielsweise durch Schleifen, wodurch aus den Kugeln tonnenförmige Teilchen werden.According to a further development of the invention, a method for manufacturing of such an insulating body specified, which consists in that a single layer of balls of about the same size is applied to a carrier and then this single layer is poured into a flexible plastic. Then will then a material-removing machining of the two surfaces is carried out, for example by grinding, which turns the balls into barrel-shaped particles.

Anhand des in der Figur dargestellten Ausführungsbeispieles wird die Erfindung nachfolgend näher erläutert.Based on the embodiment shown in the figure, the Invention explained in more detail below.

Die Figur zeigt im Querschnitt einen Ausschnitt aus einem plattenförmigen Isolierkörper gemäß der Erfindung. Der Isolierkörper besteht aus einer Scheibe 1 eines flexiblen Werkstoffes, z. B. nach Art eines Weich-PU . Eingebettet in diese Weich-PU- Scheibe oder Platte 1 sind tonnenförmige wärmeleitende Teilchen 2, deren Deckflächen 3 in einer Ebene mit den Flächen 4 der Kunststoffscheibe 1 liegen. Die tonnenförminen Teilchen 2 sollen möglichst dicht gepackt in dieser Scheibe eingebettet sein. Sie bestehen aus gut isolierendem Material. The figure shows in cross section a detail from a plate-shaped one Insulating body according to the invention. The insulating body consists of a disk 1 a flexible material, e.g. B. in the manner of a soft PU. Embedded in this Soft PU disk or plate 1 are barrel-shaped thermally conductive particles 2, their Top surfaces 3 lie in one plane with the surfaces 4 of the plastic disk 1. the Barrel-shaped particles 2 should be embedded in this disk as tightly packed as possible be. They are made of good insulating material.

^in solcher Isolierkörper ist geeignet, z. B. zwischen den Flansch eines Transistors und die Auflagefläche eines Kühlflügels eingepreßt zu werden. Um einen guten Wärmeübergang zu erzielen, bestehen die tonnenförmigen Teilchen 2 zweckmäßig aus einem keramischen Material, wie Aluminiumoxid, Titanoxid oder Berylliumoxid. Solchektamischen wärmeleitenden Teilchen besitzen weiterhin den Vorteil, daß sie hohe Preßdrucke aushalten. ^ in such an insulating body is suitable, for. B. between the flange of a transistor and the bearing surface of a cooling wing to be pressed. In order to achieve good heat transfer, the barrel-shaped particles 2 are made expediently made of a ceramic material such as aluminum oxide, titanium oxide or beryllium oxide. Suchectamic thermally conductive particles also have the advantage that they withstand high pressures.

Für gewisse Anwendungen, insbesondere für Anwendungen, bei denen der Isolierkörper auf Biegung beansprucht wird, ist es zweckmäßig, daß die wärmeleitenden Teilchen 2 mit einer dünnen Schicht eines Trennmittels z. D. n z.B. nach Art von PTFE umgeben sind, wodurch die Reibung zwischen den wärmeleitenden Teilchen 2 und der Einbettungs masse 1 verringert wird. Die wärmeleitfähigen Teilchen sind dann gewissermaßen schwimmend in die Kunststoffschicht eingebettet. For certain applications, especially for applications where the insulating body is subjected to bending, it is appropriate that the thermally conductive Particles 2 with a thin layer of a release agent e.g. D. n e.g. in the manner of PTFE are surrounded, reducing the friction between the thermally conductive particles 2 and the embedding mass 1 is reduced. The thermally conductive particles are then to a certain extent floating embedded in the plastic layer.

Die in etwa tonnenförmige Ausbildung der wärmeleitfähigen Teilchen stellt sicher, daß die flexible Vergußmasse 1 eine in sich selbst tragende 1atrix darstellt, die mit genügender Sicherheit eine halterung der wärnieleitenden Teilchen darstellt.The roughly barrel-shaped formation of the thermally conductive particles ensures that the flexible casting compound 1 is a self-supporting 1atrix represents, with sufficient security, a holder of the heat-conducting particles represents.

Bei zu@ Anwendung des bevorzugten Herstellungsverfahrens, bei dem als wärmeleitende Teilchen Kugeln verwendet werden, die dann abgeschliffen werden, ist es zweckmäßig, so weit abzuschleifen, daß die Deckflächen der tonnenförmigen wärmeleitenden Teilchen einen Durchmesser aufweisen, der etwa 3/4 bis 4/5 des Kugeldurchmessers beträgt. Zweckmäßig ist auch,die Packung der wärmeleitenden Teilchen so dicht zu machen, daß sich die einzelnen tonnenförmigen Teilchen im Bereich ihres Größendurchmessers möglichst berühren. Die an den Berührungspunkten auftretende Reibung wird sehr klein, wenn, besonders in diesem Fall, die wärmeleitenden Teilchen mit einer dünnen Schicht eines Trennmittels umgeben sind.When using the preferred manufacturing process in which balls are used as thermally conductive particles, which then sanded off it is advisable to grind so far that the top surfaces of the barrel-shaped thermally conductive particles have a diameter that is about 3/4 to 4/5 of the diameter of the sphere amounts to. It is also useful to keep the packing of the thermally conductive particles so tight make that the individual barrel-shaped particles are in the range of their size diameter touch as much as possible. The friction occurring at the points of contact is very small, when, especially in this case, the thermally conductive particles with a thin layer are surrounded by a release agent.

Claims (7)

Patentansprüche Flächenhaft ausgebildeter Isolierkörper zur Zwischenfügung zwischen elektrisch leitende Oberflächen und zur Erzielung eines Wärmeüberganges zwischen den elektrisch leitenden Oberflächen, der aus einem flexiblen Isolierstoff mit eingelagerten wärmeleitenden Teilchen besteht, dadurch gekennzeichnet, daß die wärmeleitenden Teilchen tonnenartig ausgebildet sind und ihre beiden Deckflächen jeweils Teile der beiden Oberflächen des Isolierkörpers bilden.Claims Flat insulating body for interposition between electrically conductive surfaces and to achieve heat transfer between the electrically conductive surfaces, made of a flexible insulating material with embedded thermally conductive particles, characterized in that the thermally conductive particles are barrel-shaped and their two top surfaces each form parts of the two surfaces of the insulating body. 2. Isolierkörper nach Anspruch 1, dadurch gekennzeichnet, daß die wärmeleitenden Teilchen aus Kugeln mit zwei gegenäberliegenden Abplattungen bestehen.2. Insulating body according to claim 1, characterized in that the thermally conductive particles consist of spheres with two opposite flattened areas. 3. Isolierkörper nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet daß der flexible Isolierstoff ein Kunststoff ist.3. Insulating body according to claim 1 or claim 2, characterized that the flexible insulating material is a plastic. 4. Isolierkörper nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß zwisclion den wärmeleitenden Teilchen und dem Isolierstoff eine Trennmittelschicht vorgesehen ist.4. Insulating body according to one of claims 1 to 3, characterized in that that between the thermally conductive particles and the insulating material a separating agent layer is provided. 5. Ssolierkörper nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die wärmeleitenden Teilchen aus Keramik bestehen.5. Insulating body according to one of claims 1 to 4, characterized in that that the thermally conductive particles are made of ceramic. 6. Isolierkörper nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die wärmeleitenden Teilchen aus einem starren, druckfesten Material bestehen.6. Insulating body according to one of claims 1 to 5, characterized in that that the thermally conductive particles consist of a rigid, pressure-resistant material. 7. Verfahren zum herstellen eines nach einem der Ansprüche 1 bis 6 ausgebildeten Isolierkörpers, dadurch gekennzeichnet, l\ß eine Vielzahl von Kugeln aus isolierendem und wärmeleitendem tglatcrial etwa gleicher Größe einlagig nebeneinanderliegend in einen flexiblen Kunststoff eingebettet werden und dann durch materialabhebende Bearbeitung der beiden Oberflächen die Kugeln beidseitig mit im wesentlichen ebenen und zueinander parallelen Deckflächen versehen werden.7. A method for producing one according to any one of claims 1 to 6 trained insulating body, characterized in that l \ ß a plurality of balls Made of insulating and heat-conducting tglatcrial of approximately the same size, one layer next to one another be embedded in a flexible plastic and then removed by material Machining of the two surfaces, the balls on both sides with essentially flat surfaces and cover surfaces parallel to one another are provided.
DE19792951296 1979-12-20 1979-12-20 Heat transmissive electrical insulator layer - has barrel-shaped conducting sections in sheet with plastics spacers and coating Granted DE2951296A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19792951296 DE2951296A1 (en) 1979-12-20 1979-12-20 Heat transmissive electrical insulator layer - has barrel-shaped conducting sections in sheet with plastics spacers and coating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792951296 DE2951296A1 (en) 1979-12-20 1979-12-20 Heat transmissive electrical insulator layer - has barrel-shaped conducting sections in sheet with plastics spacers and coating

Publications (2)

Publication Number Publication Date
DE2951296A1 true DE2951296A1 (en) 1981-06-25
DE2951296C2 DE2951296C2 (en) 1988-10-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4782893A (en) * 1986-09-15 1988-11-08 Trique Concepts, Inc. Electrically insulating thermally conductive pad for mounting electronic components
WO2002039797A1 (en) * 2000-11-10 2002-05-16 Telefonaktiebolaget Lm Ericsson (Publ) A dielectric spacing layer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3325582A (en) * 1964-08-27 1967-06-13 Bosch Gmbh Robert Arrangement for supporting and for conducting heat away from a semiconductor element in a capsule of electrically conductive material
US3391242A (en) * 1966-12-27 1968-07-02 Admiral Corp Transistor insulator with self-contained silicone grease supply

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3325582A (en) * 1964-08-27 1967-06-13 Bosch Gmbh Robert Arrangement for supporting and for conducting heat away from a semiconductor element in a capsule of electrically conductive material
US3391242A (en) * 1966-12-27 1968-07-02 Admiral Corp Transistor insulator with self-contained silicone grease supply

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4782893A (en) * 1986-09-15 1988-11-08 Trique Concepts, Inc. Electrically insulating thermally conductive pad for mounting electronic components
WO2002039797A1 (en) * 2000-11-10 2002-05-16 Telefonaktiebolaget Lm Ericsson (Publ) A dielectric spacing layer

Also Published As

Publication number Publication date
DE2951296C2 (en) 1988-10-27

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Owner name: AEG ELEKTRONISCHE ROEHREN GMBH, 89077 ULM, DE

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