CN115195218A - Heat-conducting composite material and preparation method and application thereof - Google Patents

Heat-conducting composite material and preparation method and application thereof Download PDF

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CN115195218A
CN115195218A CN202210736446.5A CN202210736446A CN115195218A CN 115195218 A CN115195218 A CN 115195218A CN 202210736446 A CN202210736446 A CN 202210736446A CN 115195218 A CN115195218 A CN 115195218A
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heat
graphite
conducting
composite material
layer
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马洪兵
薛晨
赵忱
彭永忠
杨国永
江南
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Ningbo Institute of Material Technology and Engineering of CAS
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Ningbo Institute of Material Technology and Engineering of CAS
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    • 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
    • B32B5/16—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 formed of particles, e.g. chips, powder or granules
    • 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
    • B32B15/00—Layered products comprising a layer of 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/16—Layered products comprising a layer of metal next to a particulate layer
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • 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
    • B32B5/22—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/30—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being formed of particles, e.g. chips, granules, powder
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • 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
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • 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
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/107—Ceramic
    • B32B2264/108—Carbon, e.g. graphite particles
    • 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
    • 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
    • B32B2571/00—Protective equipment

Abstract

The invention relates to a heat-conducting composite material and a preparation method and application thereof, wherein the heat-conducting composite material comprises the following preparation steps: providing a metal sheet, and respectively forming a graphite layer and a hard heat conducting particle layer on two opposite surfaces of the metal sheet to obtain a composite unit, wherein the particle diameter ratio of graphite in the graphite layer to hard heat conducting particles in the hard heat conducting particle layer is 10-1000; stacking at least two composite units to obtain a composite body; and carrying out cold pressing and hot press molding on the composite body to obtain the heat-conducting composite material, wherein the temperature of the prefabricated body for hot press molding is higher than the melting temperature of the metal sheet. According to the invention, the graphite layer and the hard heat-conducting particle layer which are formed on the opposite surfaces of the metal sheet are matched with the metal sheet under the vacuum hot-pressing condition, so that the prepared heat-conducting composite material has excellent mechanical property and heat-conducting property.

Description

Heat-conducting composite material and preparation method and application thereof
Technical Field
The invention relates to the technical field of metal heat-conducting composite materials, in particular to a heat-conducting composite material and a preparation method and application thereof.
Background
The traditional metal heat dissipation material has the problem of poor heat dissipation, and cannot meet the rapid development of the technologies of semiconductors, new energy sources and the like. Therefore, in the traditional technology, high-thermal-conductivity fillers such as graphite, diamond and the like are added into a metal matrix to prepare high-thermal-conductivity composite materials such as diamond-metal, graphite-metal and the like, so that the composite materials have good heat conduction and heat dissipation performance.
Although the graphite-metal matrix heat-conducting composite material has better heat conductivity, the graphite is easy to agglomerate in a metal matrix, so that the problem of uneven heat-conducting performance of the heat-conducting composite material is caused; meanwhile, when the graphite-metal matrix heat-conducting composite material is prepared, the mechanical property of the heat-conducting composite material is easily deteriorated due to the natural brittleness and the agglomeration phenomenon of graphite.
Disclosure of Invention
In view of the above, there is a need to provide a heat conductive composite material, a preparation method and applications thereof, wherein the heat conductive composite material prepared by the method has excellent mechanical properties and heat conductivity.
A preparation method of a heat-conducting composite material comprises the following preparation steps:
providing a metal sheet, and respectively forming a graphite layer and a hard heat conducting particle layer on two opposite surfaces of the metal sheet to obtain a composite unit, wherein the particle diameter ratio of graphite in the graphite layer to hard heat conducting particles in the hard heat conducting particle layer is 10-1000;
stacking at least two composite units to obtain a composite, wherein in the two adjacent composite units, the graphite layer and the hard heat-conducting particle layer are stacked;
carrying out cold pressing on the complex to obtain a prefabricated body; and
and carrying out hot press molding on the prefabricated body to obtain the heat-conducting composite material, wherein the temperature for carrying out hot press molding on the prefabricated body is higher than the melting temperature of the metal sheet.
In one embodiment, the graphite has a particle size of 10 μm to 500 μm.
In one embodiment, the hard heat-conducting particles have a particle size of 0.1 μm to 30 μm.
In one embodiment, the graphite is selected from at least one of flake graphite powder, spherical graphite powder, or graphite fiber powder.
In one embodiment, the hard heat conducting particles are selected from at least one of silicon carbide particles, aluminum nitride particles or diamond particles.
In one embodiment, the graphite layer has a thickness of 10 μm to 100 μm;
and/or the thickness of the hard heat-conducting particle layer is 0.5-30 μm;
and/or the thickness of the metal sheet is 10-100 μm.
In one embodiment, the metal sheet is selected from at least one of aluminum foil, copper foil, or silver foil.
In the preparation method of the heat-conducting composite material, the metal sheet is melted to form a semi-molten body or a flowable body, so that the gaps between the graphite and the hard heat-conducting particles can be rearranged to form a metal framework, and the mechanical property of the prepared heat-conducting composite material is improved. The particle diameter ratio of the graphite to the hard heat-conducting particles is 10-1000, the graphite and the hard heat-conducting particles can be effectively matched, so that the density of the graphite and the hard heat-conducting particles is improved, the rearranged hard heat-conducting particles can be embedded in the graphite, the slippage between the graphite and the expansion of fracture cracks are hindered, and the mechanical property of the heat-conducting composite material is improved. Meanwhile, the rearranged graphite and hard heat-conducting particles can form a heat-conducting network chain in high-orientation arrangement, so that the heat-conducting performance of the heat-conducting composite material is improved. Therefore, the heat-conducting composite material prepared by the preparation method has excellent mechanical property and heat-conducting property.
The heat-conducting composite material comprises metal frameworks and heat conductors filled between the metal frameworks, wherein the heat conductors comprise directionally arranged graphite, and hard heat-conducting particles are embedded between the graphite.
In the heat-conducting composite material, the graphite which is directionally arranged in the heat conductor is matched with the hard heat-conducting particles which are embedded between the graphite, and the hard heat-conducting particles and the metal framework act together, so that the heat-conducting composite material is endowed with excellent mechanical property and heat-conducting property.
In one embodiment, the total mass fraction of the metal skeleton, the graphite and the hard heat-conducting particles is 100%, the mass fraction of the metal skeleton is 45% -55%, the mass fraction of the graphite is 37% -52%, and the mass fraction of the hard heat-conducting particles is 3% -8%.
A thermally conductive article comprising said thermally conductive composite;
alternatively, the thermally conductive article is made of the thermally conductive composite material.
The heat-conducting composite material obtained by the invention has excellent mechanical property and heat-conducting property, so that the prepared heat-conducting product can meet the application scene of high heat dissipation and high strength requirements, and can be widely applied to the technical fields of high heat dissipation requirements and high strength requirements of semiconductors, new energy sources, communication technologies and the like.
Drawings
Fig. 1 is a scanning electron micrograph of a cross section of a thermally conductive composite of example 2;
fig. 2 is an XRD (X-ray diffraction) pattern of the thermally conductive composite of example 2;
FIG. 3 is a SEM image of the area inside the graphite layer of the cross-section of the thermally conductive composite material of example 9;
fig. 4 is a scanning electron micrograph of a cross section of the thermally conductive composite of comparative example 4.
Detailed Description
The preparation method of the heat-conducting composite material and the heat-conducting composite material provided by the invention are further described below.
One surface of the metal sheet is referred to as an upper surface, and a surface opposite to the upper surface is referred to as a lower surface.
The invention provides a preparation method of a heat-conducting composite material, which comprises the following preparation steps:
the preparation method comprises the following steps of S1, providing a metal sheet, and forming a graphite layer and a hard heat-conducting particle layer on two opposite surfaces of the metal sheet respectively to obtain a composite unit, wherein the particle diameter ratio of graphite in the graphite layer to hard heat-conducting particles in the hard heat-conducting particle layer is (10);
s2, stacking at least two composite units to obtain a composite, wherein in the two adjacent composite units, the graphite layer and the hard heat-conducting particle layer are stacked;
s3, carrying out cold pressing on the complex to obtain a prefabricated body; and
and S4, carrying out hot press molding on the prefabricated body to obtain the heat-conducting composite material, wherein the temperature for carrying out hot press molding on the prefabricated body is higher than the melting temperature of the metal sheet.
According to the preparation method of the heat-conducting composite material, the metal sheet is melted into a semi-molten body or a flowable body, the metal framework is formed after the gaps between the graphite and the hard heat-conducting particles are rearranged, the graphite and the hard heat-conducting particles with the particle diameter ratio of 10-1000 are adopted for effective matching, and the hard heat-conducting particles are embedded in the graphite, so that the prepared heat-conducting composite material has excellent mechanical property and heat-conducting property together.
In step S1, the metal sheet is selected from at least one of an aluminum foil, a copper foil, or a silver foil, so that the metal sheet can be better melted during hot pressing. Specifically, the thickness of the metal sheet is 10-100 μm.
Optionally, the graphite is selected from at least one of crystalline flake graphite powder, spherical graphite powder or graphite fiber powder, so that the graphite and the hard heat conducting particles are better matched, the hard heat conducting particles can be better embedded in the graphite, and the mechanical property and the heat conducting property of the heat conducting composite material are further improved.
Optionally, the hard heat conducting particles are selected from at least one of silicon carbide particles, aluminum nitride particles or diamond particles, so that the hard heat conducting particles can be better matched with graphite, more hard points are added in the graphite, and the mechanical property and the heat conducting property of the heat conducting composite material are better improved.
In order to better compound graphite and hard heat conducting particles, and improve the density and uniformity between the graphite and the hard heat conducting particles, and further improve the mechanical property and the heat conducting property of the heat conducting composite material, the particle diameter ratio of the graphite to the hard heat conducting particles is preferably 10 to 1000, more preferably, the particle diameter ratio of the graphite to the hard heat conducting particles is 20 to 1, and particularly preferably, the particle diameter ratio of the graphite to the hard heat conducting particles is 20 to 300.
In order to further improve the density between the graphite and the hard heat conducting particles, and improve the inlaying degree of the hard heat conducting particles in the graphite, and further improve the mechanical property and the heat conducting property of the heat conducting composite material, the particle size of the graphite is preferably 10 μm to 500 μm, more preferably 50 μm to 500 μm, and particularly preferably 100 μm to 500 μm. The particle size of the hard heat-conducting particles is preferably 0.1-30 μm, more preferably 0.1-20 μm, and particularly preferably 1-20 μm.
Optionally, the thickness of the graphite layer is 10 μm to 100 μm, preferably, the thickness of the graphite layer is 30 μm to 100 μm, and more preferably, the thickness of the graphite layer is 30 μm to 60 μm.
When the particle size of the graphite is smaller than or equal to the thickness of the graphite layer, the graphite is selected from at least one of flake graphite powder, spherical graphite powder, or graphite fiber powder, and when the particle size of the graphite is larger than the thickness of the graphite layer, the graphite is flake graphite powder.
Optionally, the thickness of the hard thermal conductive particle layer is 0.5 μm to 30 μm, preferably, the thickness of the hard thermal conductive particle layer is 0.5 μm to 20 μm, and more preferably, the thickness of the hard thermal conductive particle layer is 1 μm to 20 μm.
Through the thickness of preferred graphite layer and the thickness of stereoplasm heat conduction grained layer for graphite and stereoplasm heat conduction grain can contact the matching better, promote heat conductivity composite's heat conductivility and mechanical properties better.
In one embodiment, bonding layers are respectively arranged between the metal sheet and the graphite layer and between the metal sheet and the hard heat-conducting particle layer, and the thickness of each bonding layer is 1-50 μm, so that the graphite layer and the hard heat-conducting particle layer can be more uniformly and firmly adhered to the surface of the metal sheet.
Specifically, the adhesive agent may be adhered to both opposite surfaces of the metal sheet by spin coating, spraying, or the like, thereby forming the adhesive layer. Preferably, when the adhesive is sprayed on the opposite surfaces of the metal sheet by spraying means, the spraying time is 5s to 100s.
Optionally, the binder is selected from atomized glue, and the binder can be decomposed and volatilized in a vacuum hot-pressing process, so that the molten metal sheet can be better contacted with graphite and hard heat-conducting particles and rearranged to form a metal framework with more excellent mechanical properties, and further the mechanical properties of the heat-conducting composite material are improved.
In order to improve the uniform distribution degree and the bonding degree of the graphite and the hard heat conduction particles on the surface of the metal sheet, auxiliary bonding can be carried out by means of electrostatic adsorption, mechanical occlusion and the like.
Preferably, can squeeze the relative surface of metal sheet respectively with graphite layer and stereoplasm heat conduction grained layer through the roll-in mode and pave for graphite layer and stereoplasm heat conduction grained layer more are close to metal sheet, thereby reduce the porosity between graphite and the stereoplasm heat conduction grain in the vacuum hot pressing treatment process, give the more excellent density of heat conduction composite, promote heat conductivity composite's heat conductivility. Further, the rolling pressure is 0.1MPa-10MPa, and the rolling time is 1min-10min.
Further, graphite and hard heat conducting particles which are not completely bonded on the surface of the metal sheet can be removed in a cleaning or blowing mode, so that the retained graphite and hard heat conducting particles can be better paved on the surface of the metal sheet, the uniform distribution degree of the graphite and hard heat conducting particles on the surface of the metal sheet is better improved, the graphite and the hard heat conducting particles can be better contacted and matched in the vacuum hot pressing treatment process, and the mechanical property and the heat conducting property of the heat conducting composite material are further improved.
In step S2, the number of the composite units is preferably 50 to 500, and more preferably, the number of the composite units is 100 to 300.
In practical application, a corresponding number of composite units can be selected to be stacked according to application requirements, so that the heat-conducting composite material with the required thickness and performance range can be prepared.
In the step S3, when the composite body is subjected to cold pressing, the applied pressure direction is vertical to the transverse direction of the composite body, so that the graphite and the hard heat-conducting particles are better horizontally arranged, and the uniform distribution degree of the graphite and the hard heat-conducting particles is further improved. Further, the cold pressing temperature is normal temperature, generally 25 +/-2 ℃, and the pressure is 1MPa-15MPa.
In step S4, the step of hot press forming the preform includes: and vacuumizing, heating and pressurizing the preform and the hot-pressing mold together, preserving heat when the hot-pressing temperature reaches 660-1100 ℃, and carrying out hot-pressing sintering in a heat preservation state. And then cooling to room temperature and demolding to obtain the heat-conducting composite material.
Optionally, the heating rate is 5 ℃/min to 10 ℃/min, and the pressure of the vacuum hot-pressing treatment is 10MPa to 100MPa.
Preferably, the temperature of the vacuum hot pressing is 665-1100 ℃, and within the temperature range, the metal sheet can be better made into a semi-molten body or a flowable body, so that gaps among graphite, gaps among hard heat-conducting particles and gaps between the graphite and the hard heat-conducting particles can be better rearranged, a metal framework can be better formed, and the mechanical property of the heat-conducting composite material can be improved.
The heat preservation time of the vacuum hot pressing treatment is 10min-300min, so that the metal sheet is melted at a more stable temperature, the metal sheet is better matched with graphite and hard heat-conducting particles, and the mechanical property and the heat-conducting property of the heat-conducting composite material are further improved. More preferably, the heat preservation time of the vacuum hot pressing treatment is 30min-60min.
The invention also provides a heat-conducting composite material, which comprises metal frameworks and heat conductors filled among the metal frameworks, wherein the heat conductors comprise graphite which is arranged in an oriented mode, and hard heat-conducting particles are embedded among the graphite.
In the heat-conducting composite material, the graphite which is directionally arranged in the heat conductor is matched with the hard heat-conducting particles which are embedded between the graphite, and the hard heat-conducting particles and the metal framework act together, so that the heat-conducting composite material is endowed with excellent mechanical property and heat-conducting property.
In order to further improve the cooperation among the metal framework, the graphite and the hard heat-conducting particles and improve the heat-conducting property and the mechanical property of the heat-conducting composite material, the mass fraction of the metal framework in the heat-conducting composite material is 45-55%, the mass fraction of the graphite in the heat-conducting composite material is 37-52%, and the mass fraction of the hard heat-conducting particles in the heat-conducting composite material is 3-8%.
Further, the transverse thermal conductivity of the heat-conducting composite material is 250W/m.K-600W/m.K, the longitudinal thermal conductivity of the heat-conducting composite material is 50W/m.K-180W/m.K, the bending strength of the heat-conducting composite material is 75MPa-180MPa, and the thermal expansion coefficient of the heat-conducting composite material is 4ppm/K-8ppm/K, so that the heat conductivity and the bending strength of the heat-conducting composite material are better improved, and the heat-conducting composite material has a lower thermal expansion coefficient.
The invention also provides a heat-conducting product which comprises the heat-conducting composite material or is made of the heat-conducting composite material.
When the heat-conducting composite material is applied, the heat-conducting composite material in the heat-conducting product has excellent mechanical property and heat-conducting property, so that the requirements of high heat dissipation and high strength can be met, and the heat-conducting composite material can be widely applied to the technical fields of high heat dissipation requirements and high strength requirements of semiconductors, new energy sources, communication technologies and the like.
Hereinafter, the preparation method of the heat conductive material and the heat conductive composite material will be further described by the following specific examples.
Example 1
The emulsion adhesive was sprayed on the upper surface of 3003 aluminum foil (40 μm thick) for 10 seconds to form an adhesive layer of 10 μm thickness on the upper surface. And then, pouring crystalline flake graphite powder (with the grain size of 400 microns) on the bonding layer, paving, and removing redundant crystalline flake graphite powder by using an air blower to form a graphite layer with the thickness of 30 microns.
And spraying an emulsion adhesive on the lower surface of the 3003 aluminum foil for 5s to form an adhesive layer with the thickness of 5 microns on the lower surface. Then, silicon carbide particles (having a particle size of 5 μm) were poured onto the adhesive layer, and after the adhesive layer was laid flat, excess silicon carbide particles were removed by brush cleaning, thereby forming a silicon carbide particle layer having a thickness of 5 μm. The mass ratio of the scale graphite powder, the aluminum foil and the silicon carbide particles is 43.
And stacking 20 graphite-aluminum-silicon carbide composite units to obtain a composite, wherein in two adjacent graphite-aluminum-silicon carbide composite units, a graphite layer and a silicon carbide particle layer are laminated. And (3) carrying out cold pressing on the stacked composite body at normal temperature to obtain a prefabricated body, wherein the direction of pressure applied during cold pressing is vertical to the transverse direction of the composite body, and the pressure is 1MPa. And then placing the prefabricated body into a hot-pressing mold, sintering in a vacuum unidirectional hot-pressing sintering furnace, heating the temperature in the sintering furnace to 680 ℃ at the heating rate of 10 ℃/min, sintering, keeping the temperature for 60min and the pressure at 30MPa, and then cooling to room temperature (25 +/-2 ℃) along with the furnace to obtain the heat-conducting composite material.
Example 2
A water-soluble adhesive was sprayed on the upper surface of 3003 aluminum foil (30 μm thick) for 10 seconds to form an adhesive layer of 10 μm thickness on the upper surface. And then, pouring the crystalline flake graphite powder (with the particle size of 500 mu m) on the bonding layer, paving the bonding layer, and then sweeping the bonding layer by using a brush to remove the redundant crystalline flake graphite powder to form a graphite layer with the thickness of 40 mu m.
A water-soluble adhesive was sprayed on the lower surface of the 3003 aluminum foil for 10 seconds to form an adhesive layer having a thickness of 10 μm on the lower surface. Then, silicon carbide particles (having a particle size of 5 μm) were poured onto the adhesive layer, and after the adhesive layer was laid flat, excess silicon carbide particles were removed by brush cleaning, thereby forming a silicon carbide particle layer having a thickness of 5 μm. At this time, the mass ratio of the scale graphite powder, the aluminum foil, and the silicon carbide particles was 50.
And stacking 20 graphite-aluminum-silicon carbide composite units to obtain a composite, wherein in two adjacent graphite-aluminum-silicon carbide composite units, a graphite layer and a silicon carbide particle layer are laminated. And (3) carrying out cold pressing on the stacked composite body at normal temperature to obtain a prefabricated body, wherein the direction of pressure applied during cold pressing is vertical to the transverse direction of the composite body, and the pressure is 15MPa. And then placing the prefabricated body into a hot-pressing mold, sintering in a vacuum unidirectional hot-pressing sintering furnace, heating the temperature in the sintering furnace to 675 ℃ at the heating rate of 8 ℃/min, sintering, keeping the temperature for 100min and the pressure at 30MPa, and then cooling to room temperature (25 +/-2 ℃) along with the furnace to obtain the heat-conducting composite material.
Example 3
A water-soluble adhesive was sprayed on the upper surface of 1235 aluminum foil (thickness 80 μm) for 20 seconds to form an adhesive layer having a thickness of 20 μm on the upper surface. And then, pouring the crystalline flake graphite powder (with the particle size of 300 mu m) on the bonding layer, paving the bonding layer, and then sweeping the bonding layer by using a brush to remove the redundant crystalline flake graphite powder to form a graphite layer with the thickness of 50 mu m.
A water-soluble adhesive was sprayed on the lower surface of the 1235 aluminum foil for 10 seconds to form an adhesive layer having a thickness of 10 μm on the lower surface. Then, silicon carbide particles (having a particle size of 30 μm) were poured onto the adhesive layer, and after the adhesive layer was laid flat, excess silicon carbide particles were removed by brush cleaning, thereby forming a silicon carbide particle layer having a thickness of 30 μm. At this time, the mass ratio of the scale graphite powder, the aluminum foil and the silicon carbide particles was 37.
Stacking 300 graphite-aluminum-silicon carbide composite units to obtain a composite, wherein in two adjacent graphite-aluminum-silicon carbide composite units, a graphite layer and a silicon carbide particle layer are stacked. And (3) carrying out cold pressing on the stacked composite body at normal temperature to obtain a prefabricated body, wherein the direction of pressure applied during cold pressing is vertical to the transverse direction of the composite body, and the pressure is 5MPa. And then placing the prefabricated body into a hot-pressing mold, sintering in a vacuum unidirectional hot-pressing sintering furnace, heating the temperature in the sintering furnace to 690 ℃ at the heating rate of 10 ℃/min, sintering, keeping the temperature for 300min and the pressure at 60MPa, and then cooling to room temperature (25 +/-2 ℃) along with the furnace to obtain the heat-conducting composite material.
Example 4
A solvent-based adhesive was sprayed on the upper surface of 3003 aluminum foil (10 μm thick) for 10 seconds to form an adhesive layer of 10 μm thickness on the upper surface. Then pouring graphite fiber powder (with the particle size of 10 mu m) on the bonding layer, spreading the graphite fiber powder, removing redundant graphite fiber powder by using an air blower, and then carrying out rolling treatment on the graphite fiber powder, wherein the rolling pressure is 0.1MPa, and the rolling time is 10min, so as to form a graphite layer with the thickness of 10 mu m.
A solvent type adhesive was sprayed on the lower surface of 3003 aluminum foil for 5 seconds to form an adhesive layer with a thickness of 5 μm on the lower surface. Then, silicon carbide particles (particle size of 1 μm) were poured onto the adhesive layer, and after being laid flat, excess silicon carbide particles were removed by cleaning with a brush, thereby forming a silicon carbide particle layer having a thickness of 1 μm. At this time, the mass ratio of the graphite fiber powder, the aluminum foil, and the silicon carbide particles was 44.
And stacking 20 graphite-aluminum-silicon carbide composite units to obtain a composite, wherein in two adjacent graphite-aluminum-silicon carbide composite units, a graphite layer and a silicon carbide particle layer are laminated. And (3) carrying out cold pressing on the stacked composite body at normal temperature to obtain a prefabricated body, wherein the direction of pressure applied during cold pressing is vertical to the transverse direction of the composite body, and the pressure is 1MPa. And then placing the prefabricated body into a hot-pressing die, sintering in a vacuum unidirectional hot-pressing sintering furnace, heating the temperature in the sintering furnace to 665 ℃ at the heating rate of 5 ℃/min, sintering, keeping the temperature for 120min and the pressure for 100MPa, and then cooling to room temperature (25 +/-2 ℃) along with the furnace to obtain the heat-conducting composite material.
Example 5
Spraying emulsion adhesive on the upper surface of 3003 aluminum foil (thickness 60 μm) for 20s to form an adhesive layer with a thickness of 20 μm on the upper surface. Then, spherical graphite powder (with the grain diameter of 60 microns) is poured on the bonding layer, after the bonding layer is paved, redundant spherical graphite powder is removed through an air blower, and then the spherical graphite powder is subjected to rolling treatment, wherein the rolling pressure is 5MPa, the rolling time is 10min, and a graphite layer with the thickness of 60 microns is formed.
And spraying an emulsion adhesive on the lower surface of the 3003 aluminum foil for 5s to form an adhesive layer with the thickness of 5 microns on the lower surface. Then, silicon carbide particles (having a particle size of 3 μm) were poured on the adhesive layer, and after being spread flat, excess silicon carbide particles were removed by sweeping with a brush, thereby forming a silicon carbide particle layer having a thickness of 3 μm. At this time, the mass ratio of the spherical graphite powder, the aluminum foil, and the silicon carbide particles was 42.
Stacking 10 graphite-aluminum-silicon carbide composite units to obtain a composite, wherein in two adjacent graphite-aluminum-silicon carbide composite units, a graphite layer and a silicon carbide particle layer are stacked. And (3) carrying out cold pressing on the stacked composite body at normal temperature to obtain a prefabricated body, wherein the direction of pressure applied during cold pressing is vertical to the transverse direction of the composite body, and the pressure is 10MPa. And then placing the prefabricated body into a hot-pressing mold, sintering in a vacuum unidirectional hot-pressing sintering furnace, heating the temperature in the sintering furnace to 685 ℃ at the heating rate of 5 ℃/min, sintering, keeping the temperature for 120min and the pressure at 100MPa, and then cooling to room temperature (25 +/-2 ℃) along with the furnace to obtain the heat-conducting composite material.
Example 6
A water-soluble adhesive is coated on the upper surface of a 3003 aluminum foil (with the thickness of 100 mu m), and an adhesive layer with the thickness of 50 mu m is formed on the upper surface. Then, spherical graphite powder (with the particle size of 100 mu m) is poured on the bonding layer, and after the spherical graphite powder is laid flat, redundant spherical graphite powder is blown away by a blower to form a graphite layer with the thickness of 100 mu m.
A water-soluble adhesive was sprayed on the lower surface of the 3003 aluminum foil for 5 seconds to form an adhesive layer having a thickness of 5 μm on the lower surface. Then, diamond particles (with a particle size of 8 μm) were poured onto the adhesive layer, and after being laid flat, excess diamond particles were blown off by an air blower, to form a diamond particle layer with a thickness of 8 μm. At this time, the mass ratio of the spherical graphite powder, the aluminum foil, and the diamond particles was 43.
Stacking 8 graphite-aluminum-diamond units to obtain a composite body, wherein in two adjacent graphite-aluminum-diamond units, a graphite layer and a diamond particle layer are arranged in a laminated mode. And (3) carrying out cold pressing on the stacked composite body at normal temperature to obtain a prefabricated body, wherein the direction of pressure applied during cold pressing is vertical to the transverse direction of the composite body, and the pressure is 15MPa. And then placing the prefabricated body into a hot-pressing die, sintering the prefabricated body in a vacuum unidirectional hot-pressing sintering furnace, heating the temperature in the sintering furnace to 690 ℃ at the heating rate of 5 ℃/min, sintering the prefabricated body, keeping the temperature for 60min and the pressure at 50MPa, and cooling the prefabricated body to room temperature (25 +/-2 ℃) along with the furnace to obtain the heat-conducting composite material.
Example 7
A solvent-based adhesive was sprayed on the upper surface of a copper foil (having a thickness of 40 μm) for 20 seconds to form an adhesive layer having a thickness of 20 μm on the upper surface. And then, pouring the crystalline flake graphite powder (with the particle size of 500 mu m) on the bonding layer, and blowing away the redundant crystalline flake graphite powder by using an air blower after the crystalline flake graphite powder is laid flat to form a graphite layer with the thickness of 100 mu m.
A solvent-based adhesive was sprayed on the lower surface of the aluminum foil for 10 seconds to form an adhesive layer having a thickness of 10 μm on the lower surface. And pouring aluminum nitride particles (with the particle size of 30 mu m) on the bonding layer, spreading the bonding layer, and blowing away the excessive aluminum nitride particles by using a blower to form an aluminum nitride particle layer with the thickness of 30 mu m. At this time, the mass ratio of the scale graphite powder, the copper foil and the aluminum nitride particles is 37.
Stacking 50 graphite-copper-aluminum nitride units to obtain a composite, wherein in two adjacent graphite-copper-aluminum nitride monomers, a graphite layer and an aluminum nitride particle layer are stacked. And (3) carrying out cold pressing on the stacked composite body at normal temperature to obtain a prefabricated body, wherein the direction of pressure applied during cold pressing is vertical to the transverse direction of the composite body, and the pressure is 10MPa. And then placing the prefabricated body into a hot-pressing mold, sintering in a vacuum unidirectional hot-pressing sintering furnace, heating the temperature in the sintering furnace to 1086 ℃ at the heating rate of 8 ℃/min, sintering, keeping the temperature for 45min and the pressure at 100MPa, and then cooling to room temperature (25 +/-2 ℃) along with the furnace to obtain the heat-conducting composite material.
Example 8
Spraying atomized adhesive on the upper surface of the silver foil (with the thickness of 20 μm) for 10s to form an adhesive layer with the thickness of 10 μm on the upper surface. Then, spherical graphite powder (with a particle size of 100 μm) is poured onto the adhesive layer, and after the adhesive layer is laid flat, excess spherical graphite powder is removed by an air blower, so that a graphite layer with a thickness of 100 μm is formed.
Spraying atomized adhesive on the lower surface of the silver foil for 5s to form an adhesive layer with a thickness of 5 μm on the lower surface. Then, silicon carbide particles (having a particle size of 10 μm) were poured onto the adhesive layer, and after the adhesive layer was laid flat, excess silicon carbide particles were removed by brush cleaning, thereby forming a silicon carbide particle layer having a thickness of 10 μm. At this time, the mass ratio of the spherical graphite powder, the aluminum foil, and the silicon carbide particles was 47.
And stacking 20 graphite-silver-silicon carbide composite units to obtain a composite body, wherein in two adjacent graphite-silver-silicon carbide composite units, a graphite layer and a silicon carbide particle layer are stacked. And (3) carrying out cold pressing on the stacked composite body at normal temperature to obtain a prefabricated body, wherein the direction of pressure applied during cold pressing is vertical to the transverse direction of the composite body, and the pressure is 5MPa. And then placing the prefabricated body into a hot-pressing mold, sintering in a vacuum unidirectional hot-pressing sintering furnace, heating the temperature in the sintering furnace to 970 ℃ at the heating rate of 10 ℃/min, sintering, keeping the temperature for 60min and the pressure at 30MPa, and then cooling to room temperature (25 +/-2 ℃) along with the furnace to obtain the heat-conducting composite material.
Example 9
A water-soluble adhesive is coated on the upper surface of a 1235 aluminum foil (with the thickness of 10 mu m), and an adhesive layer with the thickness of 1 mu m is formed on the upper surface. And then, pouring the flake graphite powder (with the particle size of 100 mu m) on the bonding layer, paving the bonding layer, and blowing away the excessive flake graphite powder by using an air blower to form a graphite layer with the thickness of 10 mu m.
And spraying an adhesive on the lower surface of the 1235 aluminum foil for 5s to form an adhesive layer with a thickness of 2 μm on the lower surface. Then, diamond particles (with a particle size of 0.1 μm) were poured onto the adhesive layer, and after being laid flat, excess diamond particles were blown off by an air blower to form a diamond particle layer with a thickness of 0.5 μm. The mass ratio of the scale graphite powder, the aluminum foil and the diamond particles is 44.
And stacking 50 graphite-aluminum-diamond units to obtain a composite body, wherein in two adjacent graphite-aluminum-diamond units, a graphite layer and a diamond particle layer are laminated. And (3) cold pressing the stacked composite body at normal temperature to obtain a prefabricated body, wherein the direction of pressure applied during cold pressing is vertical to the transverse direction of the composite body, and the pressure is 15MPa. And then placing the prefabricated body into a hot-pressing mold, sintering in a vacuum unidirectional hot-pressing sintering furnace, heating the temperature in the sintering furnace to 662 ℃ at the heating rate of 5 ℃/min, sintering, keeping the temperature for 60min at the pressure of 50MPa, and then cooling to room temperature (25 +/-2 ℃) along with the furnace to obtain the heat-conducting composite material.
Example 10
Example 10 differs from example 5 only in that the number of layers of the graphite-aluminum-silicon carbide composite body stack is 50.
Example 11
Example 11 differs from example 5 only in that the number of layers of the graphite-aluminum-silicon carbide composite body stack is 100.
Example 12
Example 12 differs from example 5 only in that the number of layers of the graphite-aluminum-silicon carbide composite body stack is 300.
Example 13
Example 13 differs from example 5 only in that the number of layers of the graphite-aluminum-silicon carbide composite body stack was 500.
Comparative example 1
Comparative example 1 differs from example 1 only in that the ratio of the particle size of the crystalline flake graphite powder to that of the silicon carbide particles is 8.
Comparative example 2
Comparative example 2 differs from example 1 only in that the particle size ratio of the crystalline flake graphite powder to the silicon carbide particles is 3000.
Comparative example 3
Example 3 is different from example 1 only in that a crystalline flake graphite powder and silicon carbide particles are uniformly mixed and coated on the upper surface.
Comparative example 4
Comparative example 4 differs from example 1 only in that an equal amount of crystalline flake graphite powder is used instead of silicon carbide particles.
Comparative example 5
The thermally conductive composite of comparative example 5, comprising the following preparation steps:
3003 aluminum powder with the particle size of 30 microns, silicon carbide particles with the particle size of 5 microns and spherical graphite powder with the particle size of 300 microns are mixed to obtain mixed powder, wherein the mass ratio of the spherical graphite powder to the aluminum powder to the silicon carbide particles is 50. And then putting the mixed powder into a high-speed mixer for stirring at the rotating speed of 2500rpm for 1min, putting the mixed powder into a hot-pressing die, sintering in a vacuum hot-pressing sintering furnace, heating the temperature in the sintering furnace to 675 ℃ at the heating rate of 8 ℃/min for sintering, keeping the temperature for 100min and the pressure for 30MPa, and cooling to room temperature (25 +/-2 ℃) along with the furnace to obtain the heat-conducting composite material.
The thermally conductive composite materials obtained in examples 1 to 13 and comparative examples 1 to 5 were subjected to performance tests, and the results are shown in table 1.
And (3) testing thermal conductivity: transverse thermal conductivity and longitudinal thermal conductivity are tested by a method of 'measuring thermal diffusivity or thermal conductivity by flash method' of GB/T22588-2008.
Bending strength: the bending strength is tested by using a metal bending mechanical property test method of YB/T5349-2006.
Testing the thermal expansion coefficient: section 4 of the "detection method of carbon material for aluminum" using YS/T63.4-2006: measurement of thermal expansion coefficient "the thermal expansion coefficient was measured.
TABLE 1
Figure BDA0003715601190000171
As can be seen from the data in Table 1, examples 1 to 13 had a transverse thermal conductivity of 351 to 600W/mK, a longitudinal thermal conductivity of 50 to 160W/mK, a bending strength of 85 to 180MPa, and a thermal expansion coefficient of 5.4 to 7.4ppm/K. Comparative examples 1 to 5 had transverse thermal conductivity of 289 to 489W/m.K, longitudinal thermal conductivity of 65 to 289W/m.K, flexural strength of 55 to 73MPa, and thermal expansion coefficient of 6.1 to 8.7ppm/K. Examples 1 to 13 have excellent mechanical properties and thermal conductivity compared to comparative examples 1 to 5.
Comparing example 1 with comparative examples 1-2, it can be seen that the thermal conductivity and bending strength of example 1 are better, and the expansion coefficient is also lower, which indicates that controlling the graphite and the hard thermal conductive particles within a suitable range of particle diameter ratio helps to improve the mechanical properties and the thermal conductivity of the thermal conductive composite material. As can be seen from comparison between example 1 and comparative example 3, example 1 has better thermal conductivity and bending strength, and a lower expansion coefficient, which indicates that the formation of the graphite layer and the hard thermal conductive particle layer on the opposite surfaces of the metal sheet respectively contributes to the improvement of the mechanical properties and the thermal conductivity of the thermal conductive composite material. In contrast, in comparative example 3, the heat conductive composite material may have poor heat conductive performance due to the poor mixing uniformity of the graphite and the hard heat conductive particles.
Comparing example 1 with comparative example 4, it can be seen that the thermal conductive composite material of example 1 has a good thermal conductivity, which indicates that the addition of the hard thermal conductive particles with a suitable particle size is helpful for improving the thermal conductivity of the thermal conductive composite material.
As can be seen from the comparison between example 2 and comparative example 5, the heat-conducting composite material prepared by the preparation method of the present application has improved heat-conducting property and mechanical property compared with the heat-conducting composite material prepared by the conventional powder metallurgy preparation process, which indicates that the heat-conducting property and mechanical property of the heat-conducting composite material can be improved by the preparation method of the present application.
It can be seen from comparison between example 5 and examples 10-13 that the number of stacked layers of the graphite-aluminum-silicon carbide composite is different, and the prepared heat-conducting composite material has different heat-conducting properties and mechanical properties, so that the heat-conducting composite material can be applied to heat-conducting products with different performance requirements.
In addition, as can be seen from fig. 1 to 4, the heat-conducting composite material prepared in embodiment 2 in fig. 1 includes metal frameworks and a heat conductor filled between the metal frameworks, in the heat conductor, graphite layers are arranged in an oriented manner, and hard heat-conducting particles are uniformly embedded in the graphite layers. As can be seen from fig. 2, the heat conductive composite material contains aluminum metal, hard-particle silicon carbide, and graphite. As can be seen from FIG. 3, the combination between the single hard particles in the graphite layer and the graphite in the graphite layer is compact, and the mechanical properties of the whole graphite layer are improved. Through the cooperative action between the graphite and the hard heat-conducting particles, the heat-conducting property and the mechanical property of the heat-conducting composite material can be improved. Fig. 4 is a scanning electron microscope image of a cross section of the heat-conducting composite material prepared in comparative example 4, and it can be seen from the image that the structure includes metal skeletons and graphite heat conductors filled between the metal skeletons, and the arrangement and mechanical strength of the graphite heat conductors can affect the heat conduction and mechanical properties of the whole material.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The preparation method of the heat-conducting composite material is characterized by comprising the following preparation steps:
providing a metal sheet, and respectively forming a graphite layer and a hard heat-conducting particle layer on two opposite surfaces of the metal sheet to obtain a composite unit, wherein the particle diameter ratio of graphite in the graphite layer to hard heat-conducting particles in the hard heat-conducting particle layer is (10-1000);
stacking at least two composite units to obtain a composite, wherein in the two adjacent composite units, the graphite layer and the hard heat-conducting particle layer are stacked;
carrying out cold pressing on the composite body to obtain a prefabricated body; and
and carrying out hot press molding on the prefabricated body to obtain the heat-conducting composite material, wherein the temperature for carrying out hot press molding on the prefabricated body is higher than the melting temperature of the metal sheet.
2. The method of claim 1, wherein the graphite has a particle size of 10 μm to 500 μm.
3. The method of claim 1, wherein the hard thermal conductive particles have a particle size of 0.1 μm to 30 μm.
4. The method of claim 1, wherein the graphite is at least one selected from the group consisting of flake graphite powder, spherical graphite powder, and graphite fiber powder.
5. The method of claim 1, wherein the hard thermally conductive particles are selected from at least one of silicon carbide particles, aluminum nitride particles, or diamond particles.
6. The method for preparing the heat conductive composite material according to claim 1, wherein the graphite layer has a thickness of 10 μm to 100 μm;
and/or the thickness of the hard heat-conducting particle layer is 0.5-30 μm;
and/or the thickness of the metal sheet is 10-100 μm.
7. The method of claim 1, wherein the metal sheet is at least one selected from the group consisting of aluminum foil, copper foil, and silver foil.
8. A heat-conducting composite material obtained by the production method as set forth in any one of claims 1 to 7, characterized in that the heat-conducting composite material comprises metal skeletons and heat conductors filled between the metal skeletons, the heat conductors comprise oriented graphite, and hard heat-conducting particles are embedded between the graphite.
9. The heat conductive composite material of claim 8, wherein the metal skeleton has a mass fraction of 45% to 55% in the heat conductive composite material, the graphite has a mass fraction of 37% to 52% in the heat conductive composite material, and the hard heat conductive particles have a mass fraction of 3% to 8% in the heat conductive composite material.
10. A thermally conductive article comprising the thermally conductive composite of any one of claims 8-9;
alternatively, the thermally conductive article is made of the thermally conductive composite material as claimed in any one of claims 8 to 9.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100143690A1 (en) * 2007-03-27 2010-06-10 Universidad De Alicante Production of composite materials with high thermal conductivity
CN204160826U (en) * 2014-09-02 2015-02-18 苏州环明电子科技有限公司 A kind of Novel heat-conducting material structure
CN205510635U (en) * 2016-01-25 2016-08-24 衡山县佳诚新材料有限公司 High heat conduction graphite alkene heat dissipation metal forming
CN106671501A (en) * 2017-01-13 2017-05-17 重庆云天化瀚恩新材料开发有限公司 Highly heat-resistant graphite film metal composite and preparation method thereof
CN113122188A (en) * 2019-12-31 2021-07-16 宁波赛墨科技有限公司 Heat-conducting composite material, preparation method and application thereof
CN113122189A (en) * 2019-12-31 2021-07-16 宁波材料所杭州湾研究院 Heat-conducting composite material, preparation method and application thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100143690A1 (en) * 2007-03-27 2010-06-10 Universidad De Alicante Production of composite materials with high thermal conductivity
CN204160826U (en) * 2014-09-02 2015-02-18 苏州环明电子科技有限公司 A kind of Novel heat-conducting material structure
CN205510635U (en) * 2016-01-25 2016-08-24 衡山县佳诚新材料有限公司 High heat conduction graphite alkene heat dissipation metal forming
CN106671501A (en) * 2017-01-13 2017-05-17 重庆云天化瀚恩新材料开发有限公司 Highly heat-resistant graphite film metal composite and preparation method thereof
CN113122188A (en) * 2019-12-31 2021-07-16 宁波赛墨科技有限公司 Heat-conducting composite material, preparation method and application thereof
CN113122189A (en) * 2019-12-31 2021-07-16 宁波材料所杭州湾研究院 Heat-conducting composite material, preparation method and application thereof

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