CN107314353B - Graphene metal composite multilayer radiator with high heat conductivity and preparation method thereof - Google Patents
Graphene metal composite multilayer radiator with high heat conductivity and preparation method thereof Download PDFInfo
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- CN107314353B CN107314353B CN201710533656.3A CN201710533656A CN107314353B CN 107314353 B CN107314353 B CN 107314353B CN 201710533656 A CN201710533656 A CN 201710533656A CN 107314353 B CN107314353 B CN 107314353B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Abstract
The invention discloses a graphene metal composite multilayer radiator with high heat conductivity and a preparation method thereof, and belongs to the technical field of heat dissipation. The heat sink includes: the graphene film layer is uniformly deposited on the surface of the metal base layer; the preparation method comprises the following steps: adding graphene powder and an additive into an absolute ethyl alcohol solution, and dispersing by using ultrasonic waves to obtain a uniformly dispersed graphene dispersion liquid; adopting a strip-shaped metal sheet with equal thickness, and using dilute nitric acid, deionized water, absolute ethyl alcohol and ultrasonic waves for surface treatment to serve as a cathode; immersing the cathode and the anode together in the graphene dispersion liquid for electrophoretic deposition; and then tightly rolling the metal base layer into a multilayer cylinder from one end, welding the other end of the metal base layer on the outer side of the cylinder, annealing, and cutting the metal base layer into a cake-shaped graphene metal composite multilayer radiator in a direction perpendicular to the axial direction of the cylinder. The radiator has the advantages of high radiating efficiency, simple process, energy conservation, environmental protection, low cost and high radiating efficiency.
Description
Technical Field
The invention belongs to the technical field of heat dissipation, and particularly relates to a graphene metal composite multilayer heat radiator with high heat conductivity and a preparation method thereof.
Background
The graphene is a super-light, ultra-thin, super-strong and super-large specific surface area quasi-two-dimensional material, and the surface density is about 0.77mg/m2The thickness of the single-layer graphene is about 0.34nm, the toughness of the graphene is excellent, the elastic modulus is 1.0TPa, the microscopic strength can reach 30GPa, the thickness is more than 100 times of that of the traditional steel, and the theoretical specific surface area is 2630m2A/g, and has very high electrical and thermal conductivity, e.g. a resistivity of 2X 10-6Omega, cm, electron mobility can reach 2 x 105cm2/V.S, horizontal thermal conductivity at room temperature of about 5X 103W/m.K. Meanwhile, the graphene has high thermal stability, chemical stability and excellent anti-permeability and anti-wear properties. Therefore, the graphene has a wide application prospect in various fields such as mechanics, electronics, optics, thermology, new energy and the like, and particularly attracts people to pay attention to the synthesis of LED heat dissipation materials. The LED lamp is a novel light source in the 21 st century, and has the advantages that the traditional light source is high in efficiency, long in service life, not easy to damage and the like, and cannot be compared with the traditional light source. Poor heat dissipation of the LED can cause the problems of power supply damage, fast light attenuation, short service life, and the like, and therefore, it is important to improve the performance of the LED lighting system to improve the heat dissipation efficiency. The heat dissipation body of the traditional LED lamp is made of copper or aluminum materials, the structure is single, and the heat dissipation performance is not good.
According to the report, the heat dissipation performance of the metal material can be effectively improved by adding a proper amount of graphene into the metal material. At present, the synthesis methods of graphene/metal composite heat dissipation materials mainly include three methods: 1. coating a graphene heat dissipation coating on the metal substrate; 2. a metal powder method; 3. a melt co-refining method, and the like. However, due to the characteristic that graphene is easy to agglomerate, the problems of nonuniform dispersion and nonuniform trend of graphene and the like occur in the preparation of the composite material, so that the heat dissipation effect of the graphene composite material is reduced. In addition, in the first method, the graphene and the surface of the metal substrate are often bonded by using an organic coating, and the general organic coating has a low thermal conductivity, which is not favorable for improving the heat dissipation performance. The latter two methods are common methods for improving the comprehensive performance of metals, but the process is complex, the energy consumption is large, and the phenomena of oxidation or interface reaction and the like can be generated during high-temperature burning to cause the reduction of the material performance.
Disclosure of Invention
The invention aims to provide a graphene metal composite multilayer radiator with high heat conductivity and a preparation method thereof aiming at the problems in the prior art, and the method is simple in process, energy-saving and environment-friendly; the radiator has the advantages of novel structure, low cost and good radiating effect, and is suitable for radiating the LED.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a compound multilayer radiator of high heat conductivility graphite alkene metal which characterized in that includes: the metal substrate, the graphene film layer and the welding part; the graphene metal composite layer is tightly rolled into a round cake shape to form a spiral multilayer composite structure in which the metal base layer and the graphene film layer are alternately stacked, and the edge of the outermost graphene metal composite layer is welded with the outer surface of the multilayer composite structure to form a welding part.
The metal base layer is any one metal sheet or aluminum alloy sheet of a strip copper sheet, an aluminum sheet, a silver sheet and platinum with uniform thickness, and the thickness of the metal base layer is any value within the range of 0.05-1 mm; the graphene film layer is formed by a single layer or few layers of graphene sheets which are uniformly electrophoretically deposited on the surface of the metal base layer, and the graphene sheets are uniformly laid on the metal base layer and are mutually and tightly combined with the metal base layer or the graphene sheets.
The preparation method of the graphene metal composite multilayer radiator with high heat conductivity is characterized by comprising the following steps: the method comprises the following steps:
the first step is as follows: preparing a graphene mixed solution with the concentration of 0.01-0.025 mg/ml by using an absolute ethyl alcohol solution and graphene powder, then adding a metal salt into the mixed solution to enable the concentration of the metal salt to reach 0.3-1 mg/ml, and dispersing for 3-5 hours by using ultrasonic waves to obtain a uniformly dispersed graphene electrophoresis solution;
the second step is that: taking a strip-shaped metal sheet with the thickness of 0.05-1 mm as a metal base layer, soaking the metal sheet in dilute nitric acid with the concentration of 5-10% for 3 minutes to remove surface oxides of the metal base layer, washing the metal base layer with deionized water for multiple times, putting the metal base layer into an absolute ethyl alcohol solution, carrying out ultrasonic treatment for 5 minutes, taking out the metal base layer, and airing the metal base layer to serve as a cathode;
the third step: adopting a graphite sheet with the size equivalent to that of the cathode as an anode, arranging the surface of the cathode and the surface of the anode to be parallel, keeping the distance between the cathode and the anode at 1-2 cm, then immersing the cathode and the anode into the graphene electrophoretic liquid obtained in the first step, and carrying out electrophoretic deposition for 1-6 min under the direct current voltage of 80-160V to obtain a product uniformly covered with the graphene film layer on the metal base layer;
the fourth step: tightly rolling the product obtained in the third step from one end into a multilayer cylinder shape by using a steel nail as a rotating shaft, and fixing the edge of the other end of the product on the outer side surface of the cylinder by using a laser welding method to form a welding part to obtain a sample;
the fifth step: and annealing the sample obtained in the fourth step at the temperature of 200-300 ℃ for 1-3 h in a nitrogen atmosphere, cooling, and cutting the sample into a round cake-shaped structure in the direction perpendicular to the axial direction of the cylinder, thereby obtaining the graphene metal composite multilayer radiator with high heat conductivity.
The preparation method of the high-heat-conductivity graphene metal composite multilayer radiator is characterized by comprising the following steps of: the graphene is a single-layer or few-layer graphene sheet grown by a CVD method, and the sheet diameter is 5-50 micrometers.
The preparation method of the high-heat-conductivity graphene metal composite multilayer radiator is characterized by comprising the following steps of: the metal salt is any one or combination of magnesium nitrate, aluminum nitrate, copper nitrate and silver nitrate.
Technical effects of the invention
According to the technical scheme of the invention, the radiator and the preparation method thereof have the advantages of high radiating efficiency, simple process, energy conservation, environmental protection and low cost. The radiator can effectively solve the problems of inconsistent trend, uneven distribution and the like of graphene in the composite material, thereby greatly improving the heat dissipation coefficient of the traditional metal heat dissipation device. The axial heat conductivity coefficient of the radiator is far greater than that of a common metal radiator, and the radiator provided by the invention can rapidly reduce the temperature of an LED chip and improve the heat dissipation efficiency, thereby prolonging the service life of an LED lamp.
Drawings
Fig. 1 is a schematic structural diagram illustrating a graphene-metal composite multilayer heat sink with high thermal conductivity according to the present invention.
Fig. 2 is an oblique view illustrating a cross section of the high thermal conductivity graphene metal composite multilayer heat sink provided by the present invention.
Fig. 3 is a scanning electron microscope image of the surface of the graphene film layer of the high thermal conductivity graphene metal composite multilayer heat spreader provided by the present invention.
In the figure: 1-metal substrate, 2-graphene film layer, and 3-welding part.
Detailed Description
The structure of the high thermal conductivity graphene metal composite multilayer heat sink and the preparation method thereof of the present invention are described in detail below.
First, the structure of the high thermal conductivity graphene metal composite multilayer heat sink according to the present invention will be described in detail with reference to the accompanying drawings.
The structure of the high-thermal-conductivity graphene metal composite multilayer radiator provided by the invention is shown in fig. 1, and the high-thermal-conductivity graphene metal composite multilayer radiator provided by the invention comprises a metal base layer 1, a graphene film layer 2 and a welding part 3. The metal base layer 1 is an alloy equal-thickness strip-shaped metal sheet formed by any one or more of aluminum, copper, silver and platinum, and the thickness of the alloy equal-thickness strip-shaped metal sheet is 0.05-1 mm. And a layer of graphene film layer 2 is uniformly deposited on the surface of the strip-shaped metal sheet, and the thickness of the graphene film layer is equal to that of a single layer or few layers of graphene. The welding part 3 is positioned on the outer side of the high-heat-conductivity graphene/metal composite multilayer radiator.
Fig. 2 is an oblique view of a cross section of the high thermal conductivity graphene metal composite multilayer heat sink provided by the present invention. It can be seen that the high thermal conductivity graphene metal composite multilayer heat sink of the present invention is formed by tightly rolling the metal base layer 1 and the graphene thin film layer 2 uniformly deposited on the surface of the metal base layer 1 into a circular cake shape, and in the heat sink, the metal layer 1 and the graphene thin film layer 2 are alternately stacked to form a spiral multilayer composite structure.
The graphene thin film layer 2 of the present invention is formed by electrodepositing the graphene sheet on the surface of the metal base layer 1 by an electrophoretic deposition method.
Fig. 3 is a scanning electron microscope image showing the surface topography of the graphene film layer 2 of the high thermal conductivity graphene metal composite multilayer heat spreader provided by the present invention. As shown in fig. 3, in the graphene thin film layer 2, the graphene sheets are almost parallel to the substrate (the metal base layer 1), and lie uniformly on the surface of the substrate, and are connected to the substrate or each other closely and seamlessly. The high-thermal-conductivity graphene metal composite multilayer radiator not only solves the trend problem of graphene in composite materials, but also increases the contact area between the graphene and a base layer, so that the thermal conductivity of the radiator can be greatly improved.
In addition, according to the high-thermal-conductivity graphene metal composite multilayer radiator, the thickness can be selected at will according to actual conditions, namely, any size can be cut according to actual needs. The radius of the round cake-shaped radiator is related to the thickness of the metal layer, the thickness of the graphene film layer and the number of the rolling layers, and any size can be prepared according to actual needs.
In order to further understand the high thermal conductivity graphene metal composite multilayer heat sink and the method for manufacturing the same of the present invention, the high thermal conductivity graphene metal composite multilayer heat sink and the method for manufacturing the same of the present invention are described in detail below by examples.
Example 1:
the high-heat-conductivity graphene metal composite multilayer radiator comprises a metal base layer 1, a graphene film layer 2 and a welding part 3. The metal base layer 1 is composed of strip-shaped aluminum sheets with the thickness of 1 mm. And a layer of graphene film layer 2 is uniformly deposited on the surface of the strip-shaped aluminum sheet, and the thickness of the graphene film layer is equal to that of single-layer or few-layer graphene. The welding part 3 is positioned on the outer side of the high-heat-conductivity graphene aluminum composite multilayer radiator. The high-heat-conductivity graphene aluminum composite multilayer radiator is formed by tightly rolling a strip aluminum sheet and a graphene film layer 2 uniformly deposited on the surface of the strip aluminum sheet into a round cake shape, and the strip aluminum sheet and the graphene film layer 2 are alternately stacked in the radiator to form a spiral multilayer composite structure. The graphene thin film layer 2 of the present embodiment is a thin film formed by electrodepositing the graphene sheet on the surface of the strip-shaped aluminum sheet by an electrophoretic deposition method. In the graphene thin film layer 2, the graphene sheets are almost parallel to a substrate (strip-shaped aluminum sheet), and lie on the surface of the substrate uniformly and flatly, and are connected with the substrate or connected with each other tightly and seamlessly.
The preparation method of the graphene-aluminum composite multilayer radiator with high thermal conductivity according to the embodiment comprises the following steps: the first step is as follows: adding graphene powder into a cup of absolute ethyl alcohol solution with enough amount to form a mixed solution with the concentration of 0.015mg/ml, adding metal salt into the mixed solution to enable the concentration of the metal salt to reach 0.3mg/ml, and then ultrasonically dispersing the mixed solution for 4 hours by using an ultrasonic disperser to obtain uniformly dispersed graphene electrophoresis solution; the second step is that: in the ultrasonic dispersion process of the graphene mixed solution, a strip-shaped aluminum sheet with the thickness of 1mm is adopted and is used as a metal base layer, the metal base layer is soaked in 5% dilute nitric acid for 3 minutes to remove surface oxides of the aluminum sheet, the aluminum sheet is washed by deionized water for multiple times and then is placed in an absolute ethyl alcohol solution for ultrasonic treatment for 5 minutes, and the aluminum sheet is taken out and dried to be used as a cathode for standby; the third step: adopting a graphite sheet with the size equivalent to that of the cathode as an anode, arranging the surface of the cathode and the surface of the anode to be parallel, keeping the distance between the cathode and the anode at 1cm, then immersing the cathode and the anode together in the graphene electrophoretic solution obtained in the first step, and carrying out electrophoretic deposition for 6min under the direct current voltage of 80V to obtain a product, wherein the strip-shaped aluminum sheet is uniformly covered with the graphene film layer; the fourth step: tightly rolling the product obtained in the fourth step from one end into a multilayer cylinder by using a steel nail as a rotating shaft, and fixing the other end on the outer side of the cylinder by using a laser welding method; the fifth step: annealing at 200 ℃ for 3h in a nitrogen atmosphere, cooling, and cutting the sample into a round cake-shaped structure in the axial direction, thereby obtaining the graphene metal composite multilayer radiator with high heat conductivity.
According to the preparation method of the graphene-aluminum composite multilayer heat sink with high thermal conductivity of the embodiment, the graphene used in the preparation method is a single-layer or few-layer graphene sheet grown by a CVD method, and the sheet diameter is about 30 microns.
According to the preparation method of the graphene-aluminum composite multilayer heat sink with high thermal conductivity in the embodiment, the metal salt used in the preparation method is aluminum nitrate.
Example 2:
the high-thermal-conductivity graphene metal composite multilayer radiator comprises a metal base layer 1, a graphene film layer 2 and a welding portion 3. The metal base layer 1 is composed of strip-shaped aluminum alloy sheets with the thickness of 0.05 mm. And a layer of graphene film layer 2 is uniformly deposited on the surface of the strip-shaped aluminum alloy sheet, and the thickness of the graphene film layer is equal to that of a single layer or few layers of graphene. The welding part 3 is positioned on the outer side of the high-heat-conductivity graphene aluminum composite multilayer radiator. The high-heat-conductivity graphene aluminum alloy composite multilayer radiator is formed by tightly rolling strip aluminum alloy sheets and the graphene film layer 2 uniformly deposited on the surfaces of the strip aluminum alloy sheets into a round cake shape, and the strip aluminum alloy sheets and the graphene film layer 2 are alternately stacked in the radiator to form a spiral multilayer composite structure. The graphene film layer 2 of the present embodiment is a film formed by electrodepositing the graphene sheet on the surface of the strip-shaped aluminum alloy sheet by an electrophoretic deposition method. In the graphene film layer 2, the graphene sheets are almost parallel to a substrate (strip-shaped aluminum alloy sheet), and are uniformly and flatly laid on the surface of the substrate and are closely and seamlessly connected with the substrate or connected with each other.
The preparation method of the high-thermal-conductivity graphene-aluminum alloy composite multilayer radiator according to the embodiment comprises the following steps: the first step is as follows: adding graphene powder into a cup of absolute ethyl alcohol solution with enough amount to form a mixed solution with the concentration of 0.025mg/ml, adding metal salt into the mixed solution to enable the concentration of the metal salt to reach 1mg/ml, and then ultrasonically dispersing the mixed solution for 4 hours by using an ultrasonic disperser to obtain uniformly dispersed graphene electrophoresis solution; the second step is that: in the ultrasonic dispersion process of the graphene mixed solution, a strip-shaped aluminum sheet with the thickness of 0.05mm is adopted and is used as a metal base layer, the metal base layer is soaked in 10% dilute nitric acid for 3 minutes to remove surface oxides of the aluminum sheet, the aluminum sheet is repeatedly washed by deionized water and then is placed in an absolute ethyl alcohol solution for ultrasonic treatment for 5 minutes, and the aluminum sheet is taken out and dried to be used as a cathode for standby; the third step: adopting a graphite sheet with the size equivalent to that of the cathode as an anode, arranging the surface of the cathode and the surface of the anode to be parallel, keeping the distance between the cathode and the anode at 1cm, then immersing the cathode and the anode together in the graphene electrophoretic solution obtained in the first step, and carrying out electrophoretic deposition for 4min under the direct current voltage of 100V to obtain a product with the graphene film layer uniformly covered on the strip-shaped aluminum sheet; the fourth step: tightly rolling the product obtained in the fourth step from one end into a multilayer cylinder by using a steel nail as a rotating shaft, and fixing the other end on the outer side of the cylinder by using a laser welding method; the fifth step: annealing for 2 hours at the temperature of 300 ℃ in the nitrogen atmosphere, cooling, and cutting the sample into a round cake-shaped structure in the axial direction, thereby obtaining the graphene metal composite multilayer radiator with high heat conductivity.
According to the preparation method of the graphene-aluminum alloy composite multilayer heat sink with high thermal conductivity in the embodiment, the graphene used in the preparation method is a single-layer or few-layer graphene sheet grown by a CVD method, and the sheet diameter is about 50 micrometers.
According to the preparation method of the graphene-aluminum alloy composite multilayer radiator with high thermal conductivity, the metal salt used in the preparation method is magnesium nitrate.
Example 3:
the high-thermal-conductivity graphene metal composite multilayer radiator comprises a metal base layer 1, a graphene film layer 2 and a welding portion 3. The metal base layer 1 is composed of strip-shaped copper sheets with the thickness of 0.1 mm. And a graphene film layer 2 is uniformly deposited on the surface of the strip copper sheet, and the thickness of the graphene film layer is equal to that of a single layer or few layers of graphene. The welding part 3 is positioned on the outer side of the high-heat-conductivity graphene copper composite multilayer radiator. The high-thermal-conductivity graphene copper composite multilayer radiator is formed by tightly rolling strip copper sheets and the graphene thin film layer 2 uniformly deposited on the surfaces of the strip copper sheets into a round cake shape, and the strip copper sheets and the graphene thin film layer 2 are alternately stacked in the radiator to form a spiral multilayer composite structure. The graphene film layer 2 of this embodiment is a film formed by electrodepositing the graphene sheet on the surface of the strip-shaped copper sheet by an electrophoretic deposition method. In the graphene film layer 2, the graphene sheets are almost parallel to a substrate (strip-shaped copper sheet), and are uniformly and horizontally laid on the surface of the substrate and are closely and seamlessly connected with the substrate or the substrate.
The preparation method of the high-thermal-conductivity graphene-copper composite multilayer radiator according to the embodiment comprises the following steps: the first step is as follows: adding graphene powder into a cup of absolute ethyl alcohol solution with enough amount to form a mixed solution with the concentration of 0.02mg/ml, adding metal salt into the mixed solution to enable the concentration of the metal salt to reach 0.6mg/ml, and then ultrasonically dispersing the mixed solution for 5 hours by using an ultrasonic disperser to obtain uniformly dispersed graphene electrophoresis solution; the second step is that: in the ultrasonic dispersion process of the graphene mixed solution, a strip copper sheet with the thickness of 0.1mm is adopted and is used as a metal base layer, the metal base layer is soaked in 8% dilute nitric acid for 3 minutes to remove surface oxides of the metal base layer, the metal base layer is washed by deionized water for multiple times and then is placed in an absolute ethyl alcohol solution for ultrasonic treatment for 5 minutes, and the metal base layer is taken out and dried to be used as a cathode for standby; the third step: adopting a graphite sheet with the size equivalent to that of the cathode as an anode, arranging the surface of the cathode and the surface of the anode to be parallel, keeping the distance between the cathode and the anode at 1.5cm, then immersing the cathode and the anode together in the graphene electrophoretic solution obtained in the first step, and carrying out electrophoretic deposition for 3min under the direct current voltage of 120V to obtain a product with the graphene film layer uniformly covered on the strip-shaped copper sheet; the fourth step: tightly rolling the product obtained in the fourth step from one end into a multilayer cylinder by using a steel nail as a rotating shaft, and fixing the other end on the outer side of the cylinder by using a laser welding method; the fifth step: annealing at 300 ℃ for 1h in a nitrogen atmosphere, cooling, and cutting the sample into a round cake-shaped structure in the axial direction, thereby obtaining the graphene metal composite multilayer radiator with high heat conductivity.
According to the preparation method of the high-thermal-conductivity graphene-copper composite multilayer heat sink, the graphene used in the preparation method is a single-layer or few-layer graphene sheet grown by a CVD method, and the sheet diameter is about 20 microns.
According to the preparation method of the high-thermal-conductivity graphene-copper composite multilayer heat sink of the embodiment, the metal salt used in the preparation method is copper nitrate.
Example 4:
the high-thermal-conductivity graphene metal composite multilayer radiator comprises a metal base layer 1, a graphene film layer 2 and a welding portion 3. The metal base layer 1 is composed of strip-shaped silver sheets with the thickness of 0.5 mm. And a layer of graphene film layer 2 is uniformly deposited on the surface of the strip-shaped silver sheet, and the thickness of the graphene film layer is equal to that of single-layer or few-layer graphene. The welding part 3 is positioned on the outer side of the high-heat-conductivity graphene silver composite multilayer radiator. The high-thermal-conductivity graphene/silver composite multilayer radiator is formed by tightly rolling strip-shaped silver sheets and the graphene thin film layer 2 uniformly deposited on the surfaces of the strip-shaped silver sheets into a round cake shape, and the strip-shaped silver sheets and the graphene thin film layer 2 are alternately stacked in the radiator to form a spiral multilayer composite structure. The graphene thin film layer 2 of this embodiment is a thin film formed by electrodepositing the graphene sheet on the surface of the strip-shaped silver sheet by an electrophoretic deposition method. In the graphene film layer 2, the graphene sheets are almost parallel to the substrate (strip-shaped silver sheet), and lie on the surface of the substrate uniformly and flatly, and are connected with the substrate or connected with each other tightly and seamlessly.
The preparation method of the high-thermal-conductivity graphene-silver composite multilayer radiator according to the embodiment comprises the following steps: the first step is as follows: adding graphene powder into a cup of absolute ethyl alcohol solution with enough quantity to form a mixed solution with the concentration of 0.01mg/ml, adding metal salt into the mixed solution to enable the concentration of the metal salt to reach 0.3mg/ml, and then ultrasonically dispersing the mixed solution for 3 hours by using an ultrasonic wave dispersing instrument to obtain uniformly dispersed graphene electrophoresis solution; the second step is that: in the ultrasonic dispersion process of the graphene mixed solution, a strip-shaped silver sheet with the thickness of 0.5mm is adopted and is used as a metal base layer, the metal base layer is soaked in 5% dilute nitric acid for 3 minutes to remove surface oxides of the metal base layer, the metal base layer is washed with deionized water for multiple times and then is placed in an absolute ethyl alcohol solution for ultrasonic treatment for 5 minutes, and the metal base layer is taken out and dried to be used as a cathode for standby; the third step: adopting a graphite sheet with the size equivalent to that of the cathode as an anode, arranging the surface of the cathode and the surface of the anode to be parallel, keeping the distance between the cathode and the anode at 2cm, and then immersing the cathode and the anode together in the graphene electrophoretic solution obtained in the first step for electrophoretic deposition for 6min under the direct current voltage of 160V to obtain a product with the graphene film layer uniformly covered on the strip-shaped silver sheet; the fourth step: tightly rolling the product obtained in the fourth step from one end into a multilayer cylinder by using a steel nail as a rotating shaft, and fixing the other end on the outer side of the cylinder by using a laser welding method; the fifth step: annealing at 250 ℃ for 2h in a nitrogen atmosphere, cooling, and cutting the sample into a round cake-shaped structure in the axial direction, thereby obtaining the graphene metal composite multilayer radiator with high heat conductivity.
According to the preparation method of the graphene-silver composite multilayer radiator with high heat conductivity, the graphene used in the preparation method is a single-layer or few-layer graphene sheet grown by a CVD (chemical vapor deposition) method, and the sheet diameter is about 10 micrometers.
According to the preparation method of the high-thermal-conductivity graphene-silver composite multilayer heat sink of the embodiment, the metal salt used in the preparation method is silver nitrate.
Example 5:
the high-thermal-conductivity graphene platinum composite multilayer radiator comprises a metal base layer 1, a graphene film layer 2 and a welding portion 3. The metal base layer 1 is composed of a strip-shaped platinum sheet with the thickness of 0.2 mm. And a layer of graphene film layer 2 is uniformly deposited on the surface of the strip-shaped silver sheet, and the thickness of the graphene film layer is equal to that of single-layer or few-layer graphene. The welding part 3 is positioned on the outer side of the high-heat-conductivity graphene platinum composite multilayer radiator. The high-thermal-conductivity graphene platinum composite multilayer radiator is formed by tightly rolling a strip platinum sheet and a graphene thin film layer 2 uniformly deposited on the surface of the strip platinum sheet into a round cake shape, and the strip platinum sheet and the graphene thin film layer 2 are alternately stacked inside the radiator to form a spiral multilayer composite structure. The graphene thin film layer 2 of this embodiment is a thin film formed by electrodepositing the graphene sheet on the surface of the strip-shaped platinum sheet by an electrophoretic deposition method. In the graphene film layer 2, the graphene sheets are almost parallel to a substrate (strip platinum sheet), and lie on the surface of the substrate uniformly and flatly, and are connected with the substrate or connected with the substrate tightly and seamlessly.
The preparation method of the high-thermal-conductivity graphene platinum composite multilayer radiator according to the embodiment comprises the following steps: the first step is as follows: adding graphene powder into a cup of absolute ethyl alcohol solution with enough amount to form a mixed solution with the concentration of 0.015mg/ml, adding metal salt into the mixed solution to enable the concentration of the metal salt to reach 0.3mg/ml, and then ultrasonically dispersing the mixed solution for 4 hours by using an ultrasonic disperser to obtain uniformly dispersed graphene electrophoresis solution; the second step is that: in the ultrasonic dispersion process of the graphene mixed solution, a strip platinum sheet with the thickness of 0.5mm is adopted and taken as a metal base layer, the metal base layer is soaked in 10% dilute nitric acid for 3 minutes to remove surface oxides of the metal base layer, the metal base layer is repeatedly washed by deionized water and then placed in an absolute ethyl alcohol solution for ultrasonic treatment for 5 minutes, and the metal base layer is taken out and dried to be used as a cathode for standby; the third step: adopting a graphite sheet with the size equivalent to that of the cathode as an anode, arranging the surface of the cathode and the surface of the anode to be parallel, keeping the distance between the cathode and the anode at 2cm, and then immersing the cathode and the anode together in the graphene electrophoretic solution obtained in the first step for electrophoretic deposition for 6min under the direct current voltage of 150V to obtain a product uniformly covered with the graphene film layer on the strip-shaped platinum sheet; the fourth step: tightly rolling the product obtained in the fourth step from one end into a multilayer cylinder by using a steel nail as a rotating shaft, and fixing the other end on the outer side of the cylinder by using a laser welding method; the fifth step: annealing at the temperature of 300 ℃ for 3h, cooling, and cutting the sample into a round cake-shaped structure in the axial direction, thereby obtaining the graphene metal composite multilayer radiator with high heat conductivity.
According to the preparation method of the high-thermal-conductivity graphene platinum-gold composite multilayer radiator, the graphene used in the preparation method is a single-layer or few-layer graphene sheet grown by a CVD (chemical vapor deposition) method, and the sheet diameter is about 5 microns.
According to the preparation method of the graphene platinum gold composite multilayer heat sink with high thermal conductivity in the embodiment, the metal salt used in the preparation method is magnesium nitrate.
Example 6:
the high-thermal-conductivity graphene metal composite multilayer radiator comprises a metal base layer 1, a graphene film layer 2 and a welding portion 3. The metal base layer 1 is composed of strip-shaped aluminum sheets with the thickness of 0.1 mm. And a layer of graphene film layer 2 is uniformly deposited on the surface of the strip-shaped aluminum sheet, and the thickness of the graphene film layer is equal to that of single-layer or few-layer graphene. The welding part 3 is positioned on the outer side of the high-heat-conductivity graphene aluminum composite multilayer radiator. The high-heat-conductivity graphene/aluminum composite multilayer radiator is formed by tightly rolling a strip-shaped aluminum sheet and a graphene film layer 2 uniformly deposited on the surface of the strip-shaped aluminum sheet into a round cake shape, and the strip-shaped aluminum sheet and the graphene film layer 2 are alternately stacked in the radiator to form a spiral multilayer composite structure. The graphene thin film layer 2 of the present embodiment is a thin film formed by electrodepositing the graphene sheet on the surface of the strip-shaped aluminum sheet by using an electrophoretic deposition method. In the graphene film layer 2, the graphene sheets are almost parallel to a substrate (strip-shaped aluminum sheet), and are uniformly and horizontally laid on the surface of the substrate and are closely and seamlessly connected with the substrate or the substrate.
The preparation method of the graphene-aluminum composite multilayer radiator with high heat conductivity comprises the following steps: the first step is as follows: adding graphene powder into a cup of absolute ethyl alcohol solution with enough amount to form a mixed solution with the concentration of 0.025mg/ml, adding metal salt into the mixed solution to enable the concentration of the metal salt to reach 0.8mg/ml, and then ultrasonically dispersing the mixed solution for 4 hours by using an ultrasonic disperser to obtain uniformly dispersed graphene electrophoresis solution; the second step is that: in the ultrasonic dispersion process of the graphene mixed solution, a strip-shaped aluminum sheet with the thickness of 0.1mm is adopted and is used as a metal base layer, the metal base layer is soaked in 5% dilute nitric acid for 3 minutes to remove surface oxides of the aluminum sheet, the aluminum sheet is repeatedly washed by deionized water and then is placed in an absolute ethyl alcohol solution for ultrasonic treatment for 5 minutes, and the aluminum sheet is taken out and dried to be used as a cathode for standby; the third step: adopting a graphite sheet with the size equivalent to that of the cathode as an anode, arranging the surface of the cathode and the surface of the anode to be parallel, keeping the distance between the cathode and the anode at 1cm, then immersing the cathode and the anode together in the graphene electrophoretic solution obtained in the first step, and carrying out electrophoretic deposition for 1min under the direct current voltage of 120V to obtain a product with the graphene film layer uniformly covered on the strip-shaped aluminum sheet; the fourth step: tightly rolling the product obtained in the fourth step from one end into a multilayer cylinder by using a steel nail as a rotating shaft, and fixing the other end on the outer side of the cylinder by using a laser welding method; the fifth step: annealing at 200 ℃ for 3h in a nitrogen atmosphere, cooling, and cutting the sample into a round cake-shaped structure in the axial direction, thereby obtaining the graphene metal composite multilayer radiator with high heat conductivity.
According to the preparation method of the graphene-aluminum composite multilayer heat sink with high thermal conductivity of the embodiment, the graphene used in the preparation method is a single-layer or few-layer graphene sheet grown by a CVD method, and the sheet diameter is about 40 micrometers.
According to the preparation method of the graphene-aluminum composite multilayer heat sink with high thermal conductivity in the embodiment, the metal salt used in the preparation method is aluminum nitrate.
While the basic features and fabrication methods of the graphene-metal composite multilayer heat sink with high thermal conductivity have been described in the above embodiments, it should be understood by those skilled in the art that the present invention is not limited by the above embodiments, which are only for illustrating the structural features and principles of the present invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a compound multilayer radiator of high heat conductivility graphite alkene metal which characterized in that includes: the metal substrate, the graphene film layer and the welding part; the graphene film layer is uniformly deposited on the surface of the metal base layer to form a graphene metal composite layer, the graphene metal composite layer is tightly rolled into a round cake shape to form a spiral multilayer composite structure in which the metal base layer and the graphene film layer are alternately stacked, and the edge of the graphene metal composite layer on the outermost layer is welded with the outer surface of the multilayer composite structure to form a welding part; the graphene film layer is formed by a single layer or few layers of graphene sheets which are uniformly electrophoretically deposited on the surface of the metal base layer, and the graphene sheets are uniformly laid on the metal base layer and are mutually and tightly combined with the metal base layer or the graphene sheets.
2. The graphene-metal composite multilayer heat sink according to claim 1, wherein the metal base layer is any one of a strip-shaped copper sheet, an aluminum sheet, a silver sheet and platinum sheet or an aluminum alloy sheet with uniform thickness, and the thickness of the metal base layer is any value within a range of 0.05-1 mm.
3. The method for preparing the high-thermal-conductivity graphene metal composite multilayer heat sink according to claim 1, wherein the method comprises the following steps: the method comprises the following steps:
the first step is as follows: preparing a graphene mixed solution with the concentration of 0.01-0.025 mg/ml by using an absolute ethyl alcohol solution and graphene powder, then adding a metal salt into the mixed solution to enable the concentration of the metal salt to reach 0.3-1 mg/ml, and dispersing for 3-5 hours by using ultrasonic waves to obtain a uniformly dispersed graphene electrophoresis solution;
the second step is that: taking a strip-shaped metal sheet with the thickness of 0.05-1 mm as a metal base layer, soaking the metal sheet in 5-10% dilute nitric acid for 3 minutes to remove surface oxides, washing the metal sheet with deionized water for multiple times, putting the metal sheet into an absolute ethyl alcohol solution, carrying out ultrasonic treatment for 5 minutes, taking out the metal sheet, and airing the metal sheet to serve as a cathode;
the third step: adopting a graphite sheet with the size equivalent to that of the cathode as an anode, arranging the surface of the cathode and the surface of the anode to be parallel, keeping the distance between the cathode and the anode at 1-2 cm, then immersing the cathode and the anode into the graphene electrophoretic liquid obtained in the first step, and carrying out electrophoretic deposition for 1-6 min under the direct current voltage of 80-160V to obtain a product uniformly covered with a graphene film layer on the metal base layer;
the fourth step: tightly rolling the product obtained in the third step from one end into a multilayer cylinder shape by using a steel nail as a rotating shaft, and fixing the edge of the other end of the product on the outer side surface of the cylinder by using a laser welding method to form a welding part to obtain a sample;
the fifth step: and annealing the sample obtained in the fourth step at the temperature of 200-300 ℃ for 1-3 h in a nitrogen atmosphere, cooling, and cutting the sample into a round cake-shaped structure in the direction perpendicular to the axial direction of the cylinder, thereby obtaining the graphene metal composite multilayer radiator with high heat conductivity.
4. The method for preparing the high-thermal-conductivity graphene metal composite multilayer radiator according to claim 3, wherein the method comprises the following steps: the graphene film layer is a single-layer or few-layer graphene sheet grown by a CVD method, and the sheet diameter is 5-50 micrometers.
5. The method for preparing the high-thermal-conductivity graphene metal composite multilayer radiator according to claim 3, wherein the method comprises the following steps: the metal salt is any one or combination of magnesium nitrate, aluminum nitrate, copper nitrate and silver nitrate.
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