CN115384129A - Aluminum alloy-graphite heat spreading plate and manufacturing method thereof - Google Patents

Aluminum alloy-graphite heat spreading plate and manufacturing method thereof Download PDF

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CN115384129A
CN115384129A CN202210411881.0A CN202210411881A CN115384129A CN 115384129 A CN115384129 A CN 115384129A CN 202210411881 A CN202210411881 A CN 202210411881A CN 115384129 A CN115384129 A CN 115384129A
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plate
aluminum alloy
graphite
heat
adhesive
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闫曦
刘进行
陶则超
刘占军
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Shanxi Institute of Coal Chemistry of CAS
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Shanxi Institute of Coal Chemistry 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
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/005—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile
    • B32B9/007—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising one layer of ceramic material, e.g. porcelain, ceramic tile comprising carbon, e.g. graphite, composite carbon
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • 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 form; Layered products 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 form; Layered products 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 form; Layered products 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 form; Layered products 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 form; Layered products 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
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products 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 a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • 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
    • B32B37/1284—Application of adhesive
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/164—Drying
    • 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
    • B32B7/08—Interconnection of layers by mechanical means
    • 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
    • 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
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different 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
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/041—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B2038/0052—Other operations not otherwise provided for
    • B32B2038/0076—Curing, vulcanising, cross-linking
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • 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
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    • B32B2307/302—Conductive

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Abstract

The invention provides an aluminum alloy-graphite heat-expanding plate and a manufacturing method thereof, wherein the aluminum alloy-graphite heat-expanding plate comprises an outer shell and a graphite plate core material, wherein the outer shell is composed of an aluminum alloy bottom plate and an aluminum alloy cover plate, the graphite plate core material is embedded into the outer shell, the total thickness of the aluminum alloy bottom plate and the aluminum alloy cover plate is 1.0-2.0mm, and the thickness of the graphite plate is 1.0-3.0mm. The heat-spreading plate is formed by wrapping graphite plate with aluminum alloy, and the heat conductivity of the heat-spreading plate is mainly determined by the thickness ratio of the aluminum alloy plate to the graphite plate and the thermal contact resistance of the aluminum alloy plate and the graphite plate.

Description

Aluminum alloy-graphite heat spreading plate and manufacturing method thereof
Technical Field
The invention belongs to the technical field of high-thermal-conductivity composite materials, and particularly relates to a method for preparing an aluminum alloy/graphite heat-spreading plate by using a high-thermal-conductivity graphite film and the aluminum alloy-graphite heat-spreading plate.
Background
In many fields such as civil electronic and electrical appliances, toys, communication, cables, war industry, aerospace and the like, parts with certain heat conduction or heat dissipation functions are required, meanwhile, high mechanical strength and certain temperature resistance are required, and the products are basically produced by using metal raw materials at present, wherein the two most widely used metals are copper and aluminum. The density of the pure copper is 8.9g/cm 3 The thermal conductivity at room temperature is about 400W/mK, and the density of pure aluminum is 2.7g/cm 3 The thermal conductivity at room temperature was about 237W/mk. The higher density of copper does not meet the requirement of weight reduction of heat dissipation parts, while aluminum is lighter, but the heat conductivity of aluminum is lower, so that the requirement of the chip field of high integration and high power consumption on heat dissipation cannot be met. Therefore, it is a research and development focus in the field of heat conduction and heat dissipation to find a material having mechanical strength of metal and superior heat conductivity to copper.
The high heat-conducting graphite film is a light, corrosion-resistant and high heat-conducting film-shaped material obtained by high-temperature treatment of carbonization, graphitization and the like on a high-molecular film and then calendering, and the density of the high heat-conducting graphite film is 1.0-1.9g/cm 3 Is lighter than aluminum, has the thermal conductivity of 700-1300W/mk, which is 2-3 times that of copper and 3-5 times that of aluminum, and is an ideal lightweight materialAnd (4) feeding. The high thermal conductivity graphite film is a flexible material. At present, mainly utilize the mode that the flexible graphite membrane was cut to the continuous film, carry out the batch production of graphite fin, adorn the graphite fin in the backplate that generates heat of 3C product (mainly smart mobile phone), reduce the chip temperature that generates heat, improve life. At present, with the improvement of the performance of the smart phone, the power consumption of the smart phone also tends to increase from below 5W to above 8W, and the traditional die-cutting graphite radiating fin has the defects of low heat flux and poor mechanical strength due to thin thickness and difficulty in meeting the requirement of the smart phone on heat dissipation; in addition, for the heating main board of aviation and aerospace high-power-consumption electronic components with power consumption of 50-300W, a simple sheet-type heat sink is useless.
How to improve the flexible graphite film, without losing the excellent thermal conductivity, and improve the heat flux and mechanical strength thereof is a current problem. At present, there are two main methods for manufacturing a heat dissipation part with high mechanical strength and high thermal conductivity: firstly, a cooling working medium is poured into a vacuum metal cavity with a fine structure on the inner wall, and then a pouring opening is sealed to form a soaking plate, also called a Vapor Chamber (Vapor Chamber). When the soaking plate works, heat enters the plate from an external high-temperature area through heat conduction, and a cooling working medium around a point heat source can quickly absorb the heat and gasify the heat into steam to take away a large amount of heat energy. When the steam in the plate is diffused from a high-pressure area to a low-pressure area (namely a low-temperature area) by utilizing the latent heat of the cooling working medium and the steam contacts the inner wall with lower temperature, the working medium steam can be quickly condensed into liquid and releases heat energy. The condensed working medium flows back to the heat source point by the capillary action of the microstructure to complete a heat conduction cycle, and a two-phase cycle system with coexistence of water and water vapor is formed. The thermal conductivity of the soaking plate is very high and can reach more than ten times of that of copper; and secondly, filling gas containing a carbon source into the high-temperature vacuum furnace body, cracking the carbon source gas at high temperature, inducing and depositing a highly oriented graphite layer on the surface of the graphite substrate, stripping to obtain highly oriented pyrolytic graphite, processing the graphite plate to the required plane size, and packaging the graphite plate between the aluminum alloy base plate and the cover plate in a vacuum diffusion welding mode. The thermal conductivity of the highly oriented pyrolytic graphite is between 1400 and 1800W/mk due to the high orientation of atomic arrangement, and the highly oriented pyrolytic graphite is better than a graphite film. However, both of these methods have respective disadvantages that are difficult to overcome: the method I has poor reliability and risks of leakage and deterioration of working media, and when the method is applied to the field of aerospace, the working media of the soaking plate are prevented from circulating under the weightless working condition, so that the heat transfer efficiency is greatly reduced; the second method for preparing the highly oriented pyrolytic graphite has the advantages of large energy consumption, low yield, very high cost and limited planar size of the obtained graphite layer, and the small-batch production of the highly oriented pyrolytic graphite layer is only found in several foreign companies at present. In addition, when the graphite plate is packaged by vacuum diffusion welding, it is difficult to ensure the close contact between the metal bottom plate and the graphite plate and the cover plate, and the thermal contact resistance between the metal surface and the graphite surface cannot be stably controlled.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an aluminum alloy-graphite heat-spreading plate and a manufacturing method thereof, wherein the thermal conductivity of the aluminum alloy is 100-200W/mk, and the thermal conductivity of a graphite plate formed by laminating and hot-pressing graphite films is 800-1200W/mk. The heat conductivity of the heat-expanding plate formed by wrapping the graphite plate with the aluminum alloy is mainly determined by the thickness ratio of the aluminum alloy plate to the graphite plate and the thermal contact resistance of the aluminum alloy plate and the graphite plate.
According to the invention, the core material for strengthening heat transfer is a solid high-heat-conduction graphite plate with certain mechanical strength instead of a liquid working medium, so that the risk of leakage and deterioration of a cooling working medium or incapability of normal circulation of the working medium under the weightlessness working condition like a soaking plate is avoided, and the reliability is high. Compared with the method for packaging the highly-oriented pyrolytic graphite by a vacuum diffusion welding process, the high-thermal-conductivity graphite plate core material is prepared by laminating and hot-pressing graphite films, and has the advantages of simple process, high yield, low energy consumption and low cost. In addition, when the heat diffusion plate is packaged, the graphite plate is packaged by the aluminum alloy bottom plate and the cover plate in a screw fastening mode, the process is simple, convenient and reliable, the thermal contact resistance of the aluminum alloy plate and the graphite plate can be quantitatively estimated through the density and the arrangement of the screws and the torque of the screws, and a basis is provided for early design and later manufacturing of the heat diffusion plate. Therefore, the composite heat spreading plate with high strength and high heat conductivity can be applied to LEDs, heat conducting elements and heat exchangers, and is an ideal device in the fields of aviation and aerospace thermal control.
The invention adopts the following technical scheme:
an aluminum alloy-graphite heat-spreading plate comprises an outer shell consisting of an aluminum alloy bottom plate and an aluminum alloy cover plate and a core material of a graphite plate embedded inside, wherein the total thickness of the aluminum alloy bottom plate and the aluminum alloy cover plate is 1.0-2.0mm, and the thickness of the graphite plate is 1.0-3.0mm.
The graphite plate is formed by laminating and hot-pressing graphite films coated with high-temperature-resistant structural adhesive on two sides. The high-temperature resistant structural adhesive includes, but is not limited to, epoxy resin adhesive, polyurethane adhesive, acrylic adhesive, silicone adhesive, and anaerobic adhesive.
A manufacturing method of an aluminum alloy-graphite heat spreading plate comprises the following steps:
(1) After the double surfaces of the high-heat-conductivity graphite film are coated with glue, drying is carried out, the drying temperature is 50-80 ℃, and the baking time is 30-60 minutes.
(2) Laminating and hot-pressing the graphite film coated with the glue in the step (1), wherein the hot-pressing temperature is 100-200 ℃, the pressure is 5-15Mpa, and the hot-pressing time is 0.5-2.0 hours. The thickness of the plate formed by hot pressing the graphite film is 1.0-3.0mm.
(3) Processing the graphite film plate subjected to hot pressing in the step (2) to a required plane size, embedding the graphite film plate into a light and ultrathin aluminum alloy base plate, covering an ultrathin aluminum alloy cover plate, and sealing the graphite film plate into an aluminum alloy shell in a screw fastening mode, thereby obtaining the aluminum alloy-graphite heat-spreading plate with the mechanical strength of aluminum alloy and the high thermal conductivity of the graphite film plate.
The invention has the beneficial effects that:
1. the graphite core material is solid, is not influenced by weightlessness, has no leakage risk, and is safe and reliable.
2. The graphite packaging process is simple, reliable and controllable, and the heat-conducting property can be designed.
3. Low energy consumption, high yield, low cost and great popularization and application value.
Drawings
FIG. 1 is a schematic view showing a disassembled structure of an aluminum alloy/graphite heat-spreading plate according to example 1 of the present invention;
FIG. 2 is an assembly view of the aluminum alloy/graphite heat-dissipating plate of example 1 of the present invention.
In the figure: 1, aluminum alloy bottom plate
1-1, a baseplate boss;
1-2, an inner groove of a bottom plate;
1-3, a stud in a bottom plate;
1-4, installing holes at the edge of a bottom plate;
2, graphite plates;
2-1, graphite plate through holes;
3, an aluminum alloy cover plate;
3-2, a cover plate through hole I;
3-1 and a cover plate through hole II.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below clearly and completely, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-2, the aluminum alloy graphite heat spreading plate of the present invention comprises an aluminum alloy bottom plate 1, graphite 2, and an aluminum alloy cover plate 3.
The aluminum alloy bottom plate 1 is 0.75mm in thickness. A plurality of base plate bosses 1-1 are distributed on the outer surface of the aluminum alloy base plate 1, and the base plate bosses 1-1 are used for being attached to chips on high-power devices. The inner side of the aluminum alloy bottom plate 1 is provided with a bottom plate inner groove 1-2, and the depth of the bottom plate inner groove 1-2 is 1.5mm and is used for embedding a graphite plate; a plurality of bottom plate inner studs 1-3 are arranged in the bottom plate inner grooves 1-2, the size of a threaded hole is M2.5, and the outer diameter of each bottom plate inner stud is 5mm; and bottom plate edge mounting holes 1-4 are formed in the edges of the peripheries of the bottom plate inner grooves 1-2 and used for penetrating screws to attach the edge of the aluminum alloy bottom plate 1 to the cold guide edge.
The graphite plate 2 is formed by laminating and hot-pressing graphite films, the thickness of the graphite plate 2 is 1.5mm, the plane size of the graphite plate 2 is consistent with that of the bottom plate inner groove 1-2, the graphite plate 2 is provided with graphite plate through holes 2-1 which correspond to the studs 1-3 in the bottom plate, and during installation, the studs 1-3 in the bottom plate penetrate through the graphite plate through holes 2-1, so that the graphite plate 2 is embedded into the bottom plate inner groove 1-2 of the aluminum alloy bottom plate 1.
The aluminum alloy cover plate 3 is 0.75mm thick and is provided with a cover plate through hole I3-2 which corresponds to a base plate inner stud 1-3 in the base plate inner groove 1-2 during installation and a cover plate through hole II 3-1 which corresponds to a base plate edge installation hole 1-4 during installation.
Example 1
Coating polyurethane adhesive on two sides of a single high-thermal-conductivity graphite film with the thickness of 30 micrometers and the size of 200 x 200mm, placing the film in an oven, baking the film for 0.5 hour at the temperature of 80 ℃, taking out the film, laminating the film by 50 films, hot-pressing the film by a vulcanizing machine at the temperature of 150 ℃ and under the pressure of 5MPa, and taking out the film after hot-pressing for 1 hour to obtain the high-thermal-conductivity graphite plate 2 with the thickness of 1.5 mm.
The graphite plate 2 is processed to the required plane size, and then the surface of the graphite plate 2 is wiped by alcohol cotton to remove the excess materials such as dust and the like. And then the aluminum alloy base plate is embedded into a base plate inner groove 1-2 on the inner side of a pre-processed aluminum alloy base plate 1, a plurality of base plate inner studs 1-3 are arranged in the base plate inner groove 1-2, and base plate edge mounting holes 1-4 are arranged on the periphery of the base plate inner groove 1-2. Covering an aluminum alloy cover plate 3, fastening the aluminum alloy cover plate 3 on the aluminum alloy base plate 1 by using screws, and packaging the graphite plate 2 between the aluminum alloy base plate 1 and the aluminum alloy cover plate 3 to obtain the high-heat-conductivity aluminum alloy-graphite heat-spreading plate.
And (3) testing: electric heating sheets are pasted on a plurality of base plate bosses 1-1 in the middle of an aluminum alloy base plate 1, the total heating power of the electric heating sheets is 56W, constant-temperature water cooling plates of 25 ℃ are pasted on four sides of the aluminum alloy base plate, and when the whole aluminum alloy-graphite heat diffusion plate reaches steady-state heat balance, the maximum temperature difference on the heat diffusion plate surface is 9 ℃.
Comparative example
An aluminum alloy plate was processed to have exactly the same size as the aluminum alloy-graphite heat-diffusing plate in example 1, to obtain an aluminum alloy heat-diffusing plate. 56W of heating power was applied to the aluminum alloy-graphite heat-dissipating plate at the same position as in example 1, and the maximum temperature difference on the surface of the heat-dissipating plate was 30 ℃.
Example 2
Coating polyurethane glue on two sides of a single high-thermal-conductivity graphite film with the thickness of 30 micrometers and the size of 200 x 200mm, placing the film in an oven, baking the film for 0.5 hour at the temperature of 80 ℃, taking out the film, laminating 67 films, pressurizing the films by using a vulcanizing machine, carrying out hot pressing at the temperature of 150 ℃ and under the pressure of 5MPa for 1 hour, and taking out the films to obtain the high-thermal-conductivity graphite plate with the thickness of 2.0 mm.
Processing the graphite plate to the required plane size, and then wiping the surface of the graphite plate by alcohol cotton to remove the excess materials such as dust. Then the aluminum alloy base plate is embedded into a base plate inner groove 1-2 of a pre-processed aluminum alloy base plate 1, a plurality of base plate inner studs 1-3 are arranged in the base plate inner groove 1-2, and base plate edge mounting holes 1-4 are arranged at the peripheral edge of the base plate inner groove 1-2. Covering an aluminum alloy cover plate 3, fastening the aluminum alloy cover plate 3 on the aluminum alloy base plate 1 by using screws, and packaging a graphite plate 2 between the aluminum alloy base plate 1 and the aluminum alloy cover plate 3 to obtain the high-heat-conductivity aluminum alloy-graphite heat-spreading plate.
And (3) testing: an electric heating sheet is pasted on a bottom plate boss in the middle position of the outer side of the aluminum alloy bottom plate, the total heating power of the electric heating sheet is 56W, 25 ℃ constant-temperature water cooling plates are pasted on four sides of the aluminum alloy bottom plate, and when the aluminum alloy-graphite heat spreading plate integrally achieves stable heat balance, the maximum temperature difference on the heat spreading plate surface is 7 ℃.
Comparative example
An aluminum alloy plate was processed to have the same dimensions as those of the aluminum alloy-graphite heat-radiating plate in example 2, to obtain an aluminum alloy-graphite heat-radiating plate. An electric heating plate is pasted on the same position of the aluminum alloy-graphite heat spreading plate as the embodiment 2, the total heating power of the heating plate is 56W, 25 ℃ constant-temperature water cooling plates are pasted on four sides of an aluminum alloy bottom plate, and when the whole aluminum alloy-graphite heat spreading plate reaches steady-state heat balance, the maximum temperature difference on the heat spreading plate surface is 25 ℃.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (5)

1. The aluminum alloy-graphite heat-spreading plate is characterized by comprising an outer shell and a graphite plate core material, wherein the outer shell is composed of an aluminum alloy bottom plate and an aluminum alloy cover plate, the graphite plate core material is embedded into the outer shell, the total thickness of the aluminum alloy bottom plate and the aluminum alloy cover plate is 1.0-2.0mm, and the thickness of the graphite plate is 1.0-3.0mm.
2. The aluminum alloy-graphite heat-spreading plate according to claim 1, wherein the graphite plate is formed by coating high-temperature-resistant structural adhesive on both sides of a graphite film, laminating and hot-pressing.
3. The aluminum alloy-graphite heat spreading plate of claim 2, wherein the high temperature resistant structural adhesive is any one of epoxy resin adhesive, polyurethane adhesive, acrylic adhesive, silicone adhesive and anaerobic adhesive.
4. The manufacturing method of the aluminum alloy-graphite heat spreading plate is characterized by comprising the following steps of:
step (1), gluing two sides of a high-thermal-conductivity graphite film, and drying at 50-80 ℃ for 30-60 minutes;
laminating and hot-pressing the graphite film coated with the glue in the step (1), wherein the hot-pressing temperature is 100-200 ℃, the pressure is 5-15Mpa, the hot-pressing time is 0.5-2.0 hours, and the thickness of the plate formed by hot-pressing the graphite film is 1.0-3.0mm;
and (3) processing the graphite film plate subjected to hot pressing in the step (2) to the required plane size, embedding the graphite film plate on an aluminum alloy bottom plate, covering an aluminum alloy cover plate, fastening by using a screw, and packaging the graphite film plate into an aluminum alloy shell to obtain the aluminum alloy-graphite heat diffusion plate.
5. The method for manufacturing the aluminum alloy-graphite heat spreading plate according to claim 4, wherein the adhesive in the step (1) is a high-temperature-resistant structural adhesive and is any one of epoxy resin adhesive, polyurethane adhesive, acrylic adhesive, silicone adhesive and anaerobic adhesive.
CN202210411881.0A 2022-04-19 2022-04-19 Aluminum alloy-graphite heat spreading plate and manufacturing method thereof Pending CN115384129A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101106892A (en) * 2007-08-07 2008-01-16 哈尔滨工程大学 A graphite-metal compound heat dispersion base material and its making technology
CN104691036A (en) * 2013-12-04 2015-06-10 凯尔凯德新材料科技泰州有限公司 High-thermal-conductivity graphite composite block and preparation method thereof
CN104754913A (en) * 2013-12-27 2015-07-01 华为技术有限公司 Heat-conductive composite material sheet and preparation method thereof
CN106626578A (en) * 2016-12-30 2017-05-10 株洲晨昕中高频设备有限公司 Heat conduction graphite plate and preparation method thereof
CN109548379A (en) * 2018-12-14 2019-03-29 中国航空工业集团公司西安航空计算技术研究所 A kind of graphite heat conduction plate of mechanical connection

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101106892A (en) * 2007-08-07 2008-01-16 哈尔滨工程大学 A graphite-metal compound heat dispersion base material and its making technology
CN104691036A (en) * 2013-12-04 2015-06-10 凯尔凯德新材料科技泰州有限公司 High-thermal-conductivity graphite composite block and preparation method thereof
CN104754913A (en) * 2013-12-27 2015-07-01 华为技术有限公司 Heat-conductive composite material sheet and preparation method thereof
CN106626578A (en) * 2016-12-30 2017-05-10 株洲晨昕中高频设备有限公司 Heat conduction graphite plate and preparation method thereof
CN109548379A (en) * 2018-12-14 2019-03-29 中国航空工业集团公司西安航空计算技术研究所 A kind of graphite heat conduction plate of mechanical connection

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