EP0710178A4 - Materiau d'interface thermoconducteur conformable - Google Patents
Materiau d'interface thermoconducteur conformableInfo
- Publication number
- EP0710178A4 EP0710178A4 EP94921502A EP94921502A EP0710178A4 EP 0710178 A4 EP0710178 A4 EP 0710178A4 EP 94921502 A EP94921502 A EP 94921502A EP 94921502 A EP94921502 A EP 94921502A EP 0710178 A4 EP0710178 A4 EP 0710178A4
- Authority
- EP
- European Patent Office
- Prior art keywords
- thermally conductive
- metal mesh
- expanded metal
- layer
- resin
- 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.)
- Withdrawn
Links
- 239000000463 material Substances 0.000 title claims abstract description 38
- 229910052751 metal Inorganic materials 0.000 claims abstract description 33
- 239000002184 metal Substances 0.000 claims abstract description 33
- 239000011230 binding agent Substances 0.000 claims abstract description 18
- 239000011231 conductive filler Substances 0.000 claims abstract description 13
- 239000004020 conductor Substances 0.000 claims description 39
- 239000011347 resin Substances 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 13
- 229910052582 BN Inorganic materials 0.000 claims description 5
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 4
- 229920000178 Acrylic resin Polymers 0.000 claims description 3
- 239000004925 Acrylic resin Substances 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000005060 rubber Substances 0.000 claims description 2
- 239000011787 zinc oxide Substances 0.000 claims description 2
- 239000004820 Pressure-sensitive adhesive Substances 0.000 abstract description 6
- 239000000853 adhesive Substances 0.000 abstract description 2
- 239000000945 filler Substances 0.000 description 16
- 239000000758 substrate Substances 0.000 description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 229920001296 polysiloxane Polymers 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 229920002725 thermoplastic elastomer Polymers 0.000 description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000003522 acrylic cement Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229920005560 fluorosilicone rubber Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- 229920002633 Kraton (polymer) Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 239000012669 liquid formulation Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920005596 polymer binder Polymers 0.000 description 1
- 239000002491 polymer binding agent Substances 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F7/00—Elements not covered by group F28F1/00, F28F3/00 or F28F5/00
-
- 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
- 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
-
- 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
- H05K7/20472—Sheet interfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2266/00—Composition of foam
- B32B2266/04—Inorganic
- B32B2266/045—Metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/302—Conductive
-
- 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
Definitions
- the present invention relates to a thermally conductive interface material for transferring thermal energy from a heat source to a heat sink. More particularly, the present invention relates to a thermally conductive material which is conformable, providing for better and more uniform contact between the thermally conductive material and the substrates to which it is bonded.
- the present invention relates to a thermally conductive interface material that is interposed between a source of heat, such as an electronic component and a heat sink.
- a source of heat such as an electronic component
- the most common example of this invention is the use of a thermal material between a semiconductor device and a heat sink so that heat generated by the semiconductor can be removed.
- thermally conductive materials typically, silicone, thermoplastic rubber acrylic or urethane binders filled with one or more thermally conductive materials are used as the thermal interface.
- One such product is commercially known as CHO-THERM® thermally conductive materials, available from Chomerics, Inc. and is a silicone or urethane binder filled with alumina or boron nitride filler.
- U.S. Patent 4,654,754 disclosed two means for overcoming the problem. The first is to use a series of metal springs or thermal links which apply a counterpressure to the adjoining substrate in response to the pressure applied. The second is to use a dimpled thermal pad such that the dimples compress or move in relation to the pressure applied by the adjoining substrate. Both act to conform to irregular spacing between the substrates. Both however, are specifically designed modifications which are expensive to manufacture and use and which do not address the ability to provide constant and uniform thermal conductivity across the entire substrate surface.
- the present invention provides a thermally conductive material which contains a means for conforming to the surfaces between the thermally conductive material and the substrates between which it is interposed.
- the means for conforming is an expanded metal mesh preferably encased within both major surfaces of the thermally conductive material so that as pressure is applied between the thermally conductive material and the adjacent heat sink or heat source, the thermal material conforms to the space between the two adjacent surfaces.
- the present invention provides a conformal thermal interface material formed of a polymeric binder, a thermal filler and which contains a layer of expanded metal mesh. The expanded metal mesh deforms, even under relatively low pressures, so as to conform to the shape of the surfaces between which it is applied. This allows the material to minimize air gaps without the need for constant pressure between the layers.
- the thermally conductive material has a polymeric binder that is a pressure sensitive adhesive, such as an acrylic or silicone pressure sensitive adhesive.
- a pressure sensitive thermally conductive material allows for bonding of the thermal interface material directly to the adjacent surfaces of the heat source and heat sink without the need for other retaining means such as screws, rivets, clamps, etc. It also allows for the use of thermal interface materials on electronic components which previously could not retain such materials, due to size, configuration, etc. Moreover, it allows for the automated application and assembly of thermally conductive electronic assemblies or packages.
- thermally conductive materials comprising a blend of a polymeric binder and a thermally conductive filler wherein the material has an expanded metal mesh layer embedded therein.
- a further object of the present invention is to provide a thermally conductive, form stable sheet formed of a blend of a polymeric binder selected from the group consisting of acrylic resin, silicone rubber, fluorosilicone rubber, thermoplastic rubber and polyurethane, a thermally conductive filler and an expanded metal mesh which is embedded within at least one major surface of the material.
- Another object of the present invention is to provide a thermally conductive interface comprised of a pressure sensitive adhesive polymeric binder and one or more thermally conductive fillers and an expanded metal mesh layer embedded within at least one surface of the interface.
- Figure 1 shows a crosssectional as view of first preferred embodiment of the thermally conductive material of the present invention.
- Figure 2 shows a crosssectional view of another preferred embodiment of the thermally conductive material of the present invention.
- Figure 3 shows a crosssectional view of the embodiment of Figure 2 interposed between a heat source and a heat sink.
- a preferred embodiment of the present invention comprises a form stable, sheet like thermally conductive material formed of a polymeric binder, one or more thermally conductive fillers and an expanded metal mesh layer embedded into at least one major surface of the material.
- a form stable, sheet like thermally conductive material formed of a polymeric binder, one or more thermally conductive fillers and an expanded metal mesh layer embedded into at least one major surface of the material.
- the first major surface 3 of the material be adjacent to the heat dissipator, such as a heat sink and the second major surface 4 is adjacent to heat source.
- Figure 2 shows an alternative embodiment of the thermally conductive material wherein the expanded metal mesh 22 is fully embedded between the two major surfaces 24, 25 of the interface material.
- the embodiment basically forms three layers or zones, with the two outer ones, 21, 23, being formed solely of resin and filler and the other 22, being formed of resin, filler and the expanded metal mesh.
- Another preferred embodiment of the present invention is an assembly of a thermal energy generating means, such as an electronic component, a thermal energy dissipating means, such as a heat sink or a heat spreader, and a thermal energy transferring means such as a thermally conductive polymeric material interposed between the generating means and the dissipating means so as to move the thermal energy from the generating means to the dissipating means.
- a thermal energy generating means such as an electronic component
- a thermal energy dissipating means such as a heat sink or a heat spreader
- a thermal energy transferring means such as a thermally conductive polymeric material interposed between the generating means and the dissipating means so as to move the thermal energy from the generating means to the dissipating means.
- the assembly of Figure 3 shows the heat generating means, 35, which is typically an electronic component such as a semiconductor, a thermal energy transferring means formed of the embodiment of Figure 2 with two outer layers, 32, 34, being comprised of resin and filler and the inner or middle layer, 33, being comprised of the expanded metal mesh with the resin/filler matrix being embedded in the interstices of the metal mesh.
- a thermal energy dissipating means 31 is mounted to the outer surface of the outer layer of the transferring means.
- the dissipating means, 31, in this instance a heat sink has a disconformity or high spot 36 which applies pressure to the transfer means below and distorts the expanded metal mesh accordingly at 37.
- the expanded metal mesh accommodates such imperfections and allows the transfer means to conform to the surface of the heat sink so as to provide for uniform and constant thermal transfer across the entire surface of the substrate. This eliminates the potential for the generation of hot spots or the incomplete transfer of thermal energy from the heat generating means 35 to the heat dissipating means 31.
- the thermally conductive material may be selected from a variety of well-known polymer binders, such as acrylic resin, silicone and fluorosilicone rubber, the thermoplastic rubber such as KRATON® rubber, and various polyurethanes filled with one or more thermally conductive fillers.
- polymer binders such as acrylic resin, silicone and fluorosilicone rubber, the thermoplastic rubber such as KRATON® rubber, and various polyurethanes filled with one or more thermally conductive fillers.
- Such materials formed of silicone thermoplastic rubber or urethane are taught in U.S. Patents 4,574,879, U.S. 4,869,954 and which are incorporated herein by reference in their entireties.
- the thermally conductive material is formed of a polymeric binder of a pressure sensitive adhesive material, such as silicone or an acrylic adhesive, one or more thermally conductive fillers and the expanded metal mesh layer.
- a pressure sensitive adhesive material such as silicone or an acrylic adhesive
- thermally conductive fillers suitable for use in the present invention are particulate solids capable of providing the material with the desired thermal conductivity.
- these fillers are particulate solids which are electrically insulative as well as thermally conductive. Examples of such particles include but are not limited to aluminum oxide, aluminum nitride, boron nitride, magnesium oxide, zinc oxide, silver, gold and copper or metal coated materials, such as silver coated copper or silver coated aluminum.
- the particles should be of a sufficiently small size as to not distort the surface of the thermally conductive material.
- the filler will be of a size from about 1 micron to about 100 microns, more preferably in a range of from about 5 microns to about 25 microns.
- the fillers are to be included in the binder in an amount sufficient to provide the desired thermal conductivity.
- the fillers are included in amount of from about 10% by weight to about 85% by weight of the finished product. More preferably, the fillers are included in amounts ranging from about 40% by weight to about 75% by weight and most preferably about 68% by weight.
- the more preferred fillers are boron nitride, magnesium oxide and aluminum oxide with boron nitride being the most preferred filler.
- Additional ingredients may also be added so long as they do not interfere with the conformability or thermal conductivity of the product.
- a solvent when compounding the binder or a coupling agent for the filler so as to make the mixing and application easier.
- one may also add a pigment, flame retardant, and/or antioxidant to the material.
- Examples of preferred metals useful as an expanded metal mesh include but are not limited to, aluminum, copper, silver, iron, tinned copper, nickel plated copper, tin plated, copper clad steel and other plated or clad metals. Regardless of the material used, it should be as thin as practicable while still providing the desired conformability. Such materials are well known and commercially available. Typically these meshes are thin, about .005 inch (.127 mm) .030 inch (,76mm) in thickness and generally have diamond shaped openings of from about 25 openings/inch 2 to 2600 opening/inch 2 . Such products are available from a number of commercial sources, including Exmet and Delker.
- the expended metal mesh may be totally embedded in the thermally conductive material or at least partially embedded into one surface of the thermally conductive material.
- the thermally conductive material is formed such that there are three or more layers or zones with the expanded metal mesh/conductive resin layer forming the center layer and solely thermally conductive material forming the outer layers.
- the thermally conductive material of the present invention is formed as the pressure sensitive material it may be formed as a continuous tape, a tape containing discrete parts or as individual pads or pieces.
- the thermally conductive material of the present invention may be formed in many ways.
- One method of forming the material is to combine the resin binder with the selected filler or fillers and thoroughly mix the ingredients while slowly adding a solvent until a liquid having a smooth texture is achieved. The material is then cast onto a release sheet such as a piece of glass, MYLAR® film or coated paper, containing the expanded metal layer and heated to drive off the solvent and form the thermally conductive material.
- a release sheet such as a piece of glass, MYLAR® film or coated paper
- An alternative method is to thoroughly mix the ingredients together with a sufficient amount of solvent to obtain a thin liquid.
- the liquid can then be sprayed or coated onto a surface of the expanded metal mesh and heated to cure.
- the same liquid formulation may be used as a clip both into which the metal mesh is dipped to form the desired material.
- Another method of forming the heat conductive material of the present invention is by molding. This is particularly useful when one wishes to form a substantially thick heat conductive layer or when one wishes to form a specifically shaped heat conductive material.
- the components are mixed and poured into a prefabricated mold which contains the expanded metal mesh in its desired position.
- a release coating Preferably, one may coat the inside of the mold with a release coating before adding the components.
- the mold is then heated or otherwise subjected to an external energy field to form the molded shape.
- a preferred method is to form a laminated pressure sensitive adhesive material of three or more layers in which the center layer is formed of the expanded metal mesh, impregnated with the conductive resin matrix and an outer layer of the thermally conductive material formed on each side of the metal layer to form a cohesive laminated material.
- the outer layers may occur sequentially so that one side of the mesh layer is impregnated and cured and then the process is repeated on the opposite side. Preferably, the process is applied to both sides simultaneously.
- the material is adhesive, the outer surfaces are covered by a release layer such as a coated paper, foil or a plastic film.
- the thermally conductive product may be formed into continuous or discontinuous tapes; or sheets or pads and then cut to the desired shape; or molded in the desired shape at the outset, either in a mold or directly in place, as described above. If desired, one or both major surfaces may contain additional air removing structures, such as embossments or throughholes as are described in U.S. Patent 5,213,868, which has been incorporated herein in its entirety.
- the resultant thermally conductive material should be sufficiently soft so as to conform to the surfaces with which it interfaces.
- the material should have a Shore A hardness of less than 90, more preferably, a Shore A hardness of about 10.
- Thickness-1 to 20 mils, preferably about 5-8 mils
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
- Laminated Bodies (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
Matériau d'interface thermoconducteur composé d'un liant polymère (2), d'au moins une charge de remplissage thermoconductrice (1) et d'une couche d'un matériau à mailles métallique et expansé (3), au moins en partie encastrée dans l'une des surfaces principales du liant. L'interface est de préférence composée d'un matériau adhésif adhérant sous l'effet de la pression, et, idéalement, se présente sous forme d'un ruban ou de tampons autocollants.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US91497 | 1987-08-31 | ||
US9149793A | 1993-07-14 | 1993-07-14 | |
PCT/US1994/007793 WO1995002505A1 (fr) | 1993-07-14 | 1994-07-11 | Materiau d'interface thermoconducteur conformable |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0710178A1 EP0710178A1 (fr) | 1996-05-08 |
EP0710178A4 true EP0710178A4 (fr) | 1997-06-11 |
Family
ID=22228091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94921502A Withdrawn EP0710178A4 (fr) | 1993-07-14 | 1994-07-11 | Materiau d'interface thermoconducteur conformable |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0710178A4 (fr) |
JP (1) | JPH09501016A (fr) |
KR (1) | KR960703723A (fr) |
TW (1) | TW257887B (fr) |
WO (1) | WO1995002505A1 (fr) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997048957A1 (fr) * | 1996-06-21 | 1997-12-24 | Thermalloy, Inc. | Pre-application de graisse a des puits de chaleur dotes d'un revetement protecteur |
CN1150399C (zh) * | 1996-06-21 | 2004-05-19 | 热合金公司 | 一种散热片和一种在散热片上施加导热油脂的方法 |
US6059116A (en) * | 1996-06-21 | 2000-05-09 | Thermalloy, Inc. | Heat sink packaging devices |
US6143076A (en) * | 1996-06-21 | 2000-11-07 | Thermalloy Inc. | Applicator head |
DE60035798T2 (de) * | 1999-12-01 | 2008-04-30 | Cool Options, Inc. | Tragrahmen eines wärmeleitenden materials |
AU2002229042A1 (en) * | 2000-12-12 | 2002-06-24 | Shri Diksha Corporation | Lightweight circuit board with conductive constraining cores |
US6512295B2 (en) | 2001-03-01 | 2003-01-28 | International Business Machines Corporation | Coupled-cap flip chip BGA package with improved cap design for reduced interfacial stresses |
JP4062994B2 (ja) * | 2001-08-28 | 2008-03-19 | 株式会社豊田自動織機 | 放熱用基板材、複合材及びその製造方法 |
CN100370210C (zh) * | 2002-11-06 | 2008-02-20 | 徐惠群 | 填满热传导件间间隙的方法及其热传导件结构 |
USRE45637E1 (en) | 2005-08-29 | 2015-07-28 | Stablcor Technology, Inc. | Processes for manufacturing printed wiring boards |
US7730613B2 (en) | 2005-08-29 | 2010-06-08 | Stablcor, Inc. | Processes for manufacturing printed wiring boards |
CN103298243B (zh) | 2006-07-14 | 2016-05-11 | 斯塔布科尔技术公司 | 具有构成电路一部分的核心层的增层印刷线路板衬底 |
DE102008047649B4 (de) * | 2008-09-15 | 2011-03-31 | Gerhard Menninga | Platte zum Ausgleichen von Wärme in einer Leiterplatte und zum Abführen von Wärme von einer Leiterplatte und Anordnung einer solchen Platte mit einer Leiterplatte |
CN103079819B (zh) * | 2010-08-31 | 2015-06-17 | 保力马科技(日本)株式会社 | 导热片 |
JP2013220652A (ja) * | 2012-04-19 | 2013-10-28 | Three M Innovative Properties Co | 遮熱シート |
DE102013208653A1 (de) * | 2013-05-10 | 2014-11-13 | Sts Spezial-Transformatoren-Stockach Gmbh & Co. Kg | Induktives Bauteil |
US9332632B2 (en) | 2014-08-20 | 2016-05-03 | Stablcor Technology, Inc. | Graphene-based thermal management cores and systems and methods for constructing printed wiring boards |
WO2020211930A1 (fr) * | 2019-04-16 | 2020-10-22 | Huawei Technologies Co., Ltd. | Un dispositif de transfert de chaleur entre une première unité et une seconde unité |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4037009A (en) * | 1976-08-11 | 1977-07-19 | Metex Corporation | Conductive elastomeric elements |
US4258100A (en) * | 1977-09-09 | 1981-03-24 | Kabushiki Kaisha Kyowa | Pressure-sensitive electric conductive sheet material |
US4685987A (en) * | 1983-09-02 | 1987-08-11 | The Bergquist Company | Method of preparing interfacings of heat sinks with electrical devices |
JPH01173514A (ja) * | 1987-12-25 | 1989-07-10 | Shin Etsu Chem Co Ltd | 熱伝導性電気絶縁シート及びその製造方法 |
EP0528606A2 (fr) * | 1991-08-13 | 1993-02-24 | Parker-Hannifin Corporation | Matériaux thermoconducteurs d'interface |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4900877A (en) * | 1987-01-13 | 1990-02-13 | Raychem Corporation | Shielding and sealing gaskets |
US4869954A (en) * | 1987-09-10 | 1989-09-26 | Chomerics, Inc. | Thermally conductive materials |
-
1994
- 1994-07-11 KR KR1019960700166A patent/KR960703723A/ko not_active Application Discontinuation
- 1994-07-11 EP EP94921502A patent/EP0710178A4/fr not_active Withdrawn
- 1994-07-11 JP JP7504659A patent/JPH09501016A/ja active Pending
- 1994-07-11 WO PCT/US1994/007793 patent/WO1995002505A1/fr not_active Application Discontinuation
- 1994-08-03 TW TW083107108A patent/TW257887B/zh active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4037009A (en) * | 1976-08-11 | 1977-07-19 | Metex Corporation | Conductive elastomeric elements |
US4258100A (en) * | 1977-09-09 | 1981-03-24 | Kabushiki Kaisha Kyowa | Pressure-sensitive electric conductive sheet material |
US4685987A (en) * | 1983-09-02 | 1987-08-11 | The Bergquist Company | Method of preparing interfacings of heat sinks with electrical devices |
JPH01173514A (ja) * | 1987-12-25 | 1989-07-10 | Shin Etsu Chem Co Ltd | 熱伝導性電気絶縁シート及びその製造方法 |
EP0528606A2 (fr) * | 1991-08-13 | 1993-02-24 | Parker-Hannifin Corporation | Matériaux thermoconducteurs d'interface |
US5213868A (en) * | 1991-08-13 | 1993-05-25 | Chomerics, Inc. | Thermally conductive interface materials and methods of using the same |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 013, no. 445 (E - 829) 6 October 1989 (1989-10-06) * |
See also references of WO9502505A1 * |
Also Published As
Publication number | Publication date |
---|---|
TW257887B (fr) | 1995-09-21 |
EP0710178A1 (fr) | 1996-05-08 |
JPH09501016A (ja) | 1997-01-28 |
WO1995002505A1 (fr) | 1995-01-26 |
KR960703723A (ko) | 1996-08-31 |
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