CN109808282A - A kind of graphite aluminum matrix composite and preparation method thereof - Google Patents
A kind of graphite aluminum matrix composite and preparation method thereof Download PDFInfo
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- CN109808282A CN109808282A CN201711162933.0A CN201711162933A CN109808282A CN 109808282 A CN109808282 A CN 109808282A CN 201711162933 A CN201711162933 A CN 201711162933A CN 109808282 A CN109808282 A CN 109808282A
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Abstract
The embodiment of the invention discloses a kind of preparation methods of graphite aluminum matrix composite, which comprises carries out configuration to graphite film, obtains structure parameters；Perforation processing is carried out to the graphite film based on structure parameters, is obtained and the matched graphite film with perforation structure of the structure parameters；It is sintered after being mixed with the matched graphite film with perforation structure of the structure parameters with aluminum substrate, aluminum substrate is enable at least through the perforation structure, to obtain graphite aluminum matrix composite.The embodiment of the invention also discloses a kind of graphite aluminum matrix composites.
Description
Technical field
The present invention relates to metal-base composites and its preparation technical field more particularly to a kind of graphite aluminum matrix composites
And preparation method thereof.
Background technique
With the continuous development of electronics industry, electronic device is constantly to miniaturization, integrated, high power and lightweight side
To development, this is continuously increased its heat density, and heat-dissipating space constantly reduces, and heat dissipation becomes the key problem in the field.Therefore,
There is an urgent need to develop with high thermal conductivity, low thermal coefficient of expansion, lightweight thermal management materials.And metal-base composites is to collect high
The thermal management materials of the excellent properties such as thermally conductive, low thermal expansion, low-density, for example, graphite/metal composite material, due to
It is the heat pipe of a kind of great competitiveness and development prospect with superelevation thermal conductivity, low thermal expansion, lightweight and good processing performance
Manage material.
The graphite/metal composite material has serious anisotropy, for example, graphite film/aluminium laminar composite
Thermal conductivity may be up to 380-940W/mK in face, and the thermal conductivity of thickness direction is very low, only 29-7W/mK).That is, this
Kind material is ideal two-dimentional heat sink material, it enables to heat quickly to spread along two-dimensional directional, realizes soaking and heat dissipation
Purpose.But many heat management occasions need material that not only direction has high thermal conductivity in face, thickness direction should also have
There is higher thermal conductivity.Therefore, how making graphite/metal composite material, not only the direction in face has high thermal conductivity, but also
Thermal conductivity with higher can also be also answered to become urgent problem to be solved in thickness direction.
Summary of the invention
To solve existing technical problem, the embodiment of the invention provides a kind of graphite aluminum matrix composite and its systems
Preparation Method can at least solve the above-mentioned problems in the prior art.
The technical solution of the embodiment of the present invention is achieved in that
First aspect of the embodiment of the present invention provides a kind of preparation method of graphite aluminum matrix composite, comprising:
Configuration is carried out to graphite film, obtains structure parameters；
Perforation processing is carried out to the graphite film based on structure parameters, is obtained matched with perforation with the structure parameters
The graphite film of structure；
It is sintered after being mixed with the matched graphite film with perforation structure of the structure parameters with aluminum substrate,
Aluminum substrate is set at least through the perforation structure, to obtain graphite aluminum matrix composite.
In above scheme, the graphite film is artificial synthetic graphite film or graphene film；And/or
The aluminum substrate is aluminum or aluminum alloy；And/or
The aluminum substrate is that the following are at least one of shapes: foil-like, plate, powdery.
In above scheme, the structure parameters include at least one of following parameter: hole dimension, punching rate and perforation
Arrangement mode.
In above scheme, the punching rate is greater than 0, is less than or equal to 80%；Alternatively, the punching rate is 1%-40%.
In above scheme, the arrangement mode of the perforation is at least one of following manner: rectangular pitch, polygon
Arrangement, center of area arrangement.
In above scheme, hole dimension is 200 μm of -6mm.
In above scheme, the volume content of graphite film is 11-70% in the graphite aluminum matrix composite.
In above scheme, the sintering processes, comprising:
It is 645-660 DEG C in temperature, and/or, pressure 20-45MPa, and/or, sintering time is the item of 60-100min
It is sintered under part.
It is described to be mixed with the matched graphite film with perforation structure of the structure parameters with aluminum substrate in above scheme
After be sintered before, the method also includes:
The graphite film with perforation structure is cleaned using acetone.
Second aspect of the embodiment of the present invention provides a kind of graphite aluminum matrix composite, and the graphite aluminum matrix composite is
The preparation-obtained graphite aluminum matrix composite of any of the above method.
Graphite aluminum matrix composite and preparation method thereof described in the embodiment of the present invention, compared with continuous laminar configuration, energy
Perforation structure is enough utilized, therefore introducing aluminium channel in the thickness direction of graphite film can be such that the thermal conductivity of thickness direction is mentioned
Height, and for direction in face, graphite film still has high-orientation, i.e., thermal conductivity maintains higher level in face.Moreover, by
It can regulate and control in more broad range in the parameters such as hole dimension (namely aperture) and punching rate, it is described, it enables to
The performance of graphite aluminum matrix composite regulate and control in the larger context, meet the different demands of different heat management occasions.
Detailed description of the invention
Fig. 1 is the flow chart of the preparation method of graphite of embodiment of the present invention aluminum matrix composite；
Fig. 2 is graphite film of embodiment of the present invention configuration design scheme schematic diagram；
Fig. 3 is preparation flow schematic diagram of the composite material of the embodiment of the present invention in a specific example；
Fig. 4 is the micro-structure diagram of graphite of embodiment of the present invention aluminum matrix composite.
Specific embodiment
The big feature of composite material one be exactly with designability, but for graphite/aluminium composite material, but seldom about
Regulate and control the report of its performance by controlling shape, distribution and continuity of graphite etc..But in fact, these configurations of graphite are joined
Number has a great impact for the performance of composite material, for example, graphite is in face from continuous laminar configuration to discontinuous laminar configuration
The continuity in interior direction reduces, and aluminium increases in the continuity of thickness direction, this allow in material face and it is thick to thermal conductivity
It changes.In practical application, many heat management occasions need according to the actual situation to the performance of used thermal management materials into
Row design and regulation, therefore, it is necessary to seek effective method graphite/metal composite material is regulated and controled and be designed, make
Thickness is promoted to thermal conductivity, to improve its anisotropy, meanwhile, form the design of graphite/metal composite property and regulation
Means, to meet the different demands of different heat management occasions.
Therefore, to solve the above-mentioned problems, the embodiment of the invention provides a kind of graphite aluminum matrix composite and its preparations
Method.Here, in order to more fully hereinafter understand the features of the present invention and technology contents, with reference to the accompanying drawing to of the invention
Realization is described in detail, appended attached drawing purposes of discussion only for reference, is not used to limit the present invention.
The preparation method for present embodiments providing a kind of graphite aluminum matrix composite specifically present embodiments provides one
Kind high thermal conductivity graphite/aluminium composite material configuration design scheme and preparation method thereof, this method is simply controllable, parameter variation range
Extensively, effective, prepared composite property is excellent, and can regulate and control in very wide range, and then can adapt to difference
Demand of the heat management occasion to the performance of material is ideal thermal management materials.
Specifically, Fig. 1 is the implementation process schematic diagram of the preparation method of graphite of embodiment of the present invention aluminum matrix composite, such as
Shown in Fig. 1, which comprises
Step 101: configuration being carried out to graphite film, obtains structure parameters；
Specifically, graphite film configuration is designed, how perforation processing is carried out to graphite film as shown in Fig. 2, designing first, than
Such as, some perforation for meeting structure parameters are designed on graphite film.Here, the structure parameters are controllable, can be according to reality
Demand and regulate and control, for example, can be set according to theoretical model, according to actual performance demand to structure parameters in practical application
Meter；Further, the structure parameters include at least one of following parameter: hole dimension, the arrangement of punching rate and perforation
Mode.
Step 102: perforation processing being carried out to the graphite film based on structure parameters, is obtained matched with the structure parameters
Graphite film with perforation structure；
Specifically, graphite film configuration handle, for example, as shown in Fig. 2, according to designed hole dimension (namely aperture),
The structure parameters such as punching rate and the arrangement mode of perforation carry out perforation processing to graphite film using punch, obtain having perforation
The graphite film of structure.
Here, in practical applications, after step 102, can be used acetone to configuration, treated with perforation structure
Graphite film is cleaned, spare after drying.
Step 103: being carried out after being mixed with the matched graphite film with perforation structure of the structure parameters with aluminum substrate
Sintering processes enable aluminum substrate at least through the perforation structure, to obtain graphite aluminum matrix composite.
Specifically, prepared by composite material, by the configuration graphite film that treated has perforation structure and aluminum substrate according to one
Fixed volume content mixing is placed in mold, is sintered；Here, due to having perforation structure in graphite film, so,
During the sintering process, aluminium base physical efficiency at least runs through the perforation structure, and then obtains graphite aluminum matrix composite.
In a specific example, as shown in figure 3, aluminum substrate is placed in the upper and lower surfaces of the graphite film with perforation structure,
Here, in practical application, the arrangement of graphite film and aluminum substrate can be adjusted according to performance requirement；Further, it will arrange
The graphite film with perforation structure after cloth is placed in mold with aluminum substrate, is sintered, during sintering processes,
Aluminum substrate can penetrate into the graphite film, and can run through aluminum substrate in perforation structure, in this way, obtaining graphite aluminum matrix composite.
In the present embodiment, the vacuum hotpressing temperature during the sintering processes is higher than the melting temperature of aluminum substrate；Than
Such as, in a specific example, the sintering processes, comprising: temperature be 645-660 DEG C, and/or, pressure 20-45MPa,
And/or sintering time is progress vacuum heating-press sintering processing under conditions of 60-100min.
In a specific example, the graphite film can be artificial synthesized graphite film, be also possible to graphene film.
In another specific example, the aluminum substrate refers to aluminium either aluminium and its alloy, further, the aluminium base
Body is that the following are at least one of shapes: foil-like, plate, powdery.
In a specific example, the arrangement mode of the perforation is at least one of following manner: rectangular pitch, more
The arrangement of side shape, center of area arrangement.
In another specific example, the volume content of graphite film is 11%-70% in the graphite aluminum matrix composite.
In another embodiment, the hole dimension is not less than 200 μm.Preferably, the diameter of perforation, namely perforation
Having a size of 200 μm of -6mm.
In another embodiment, the punching rate is not more than 80%.Preferably, punching rate 1%-40%.
In this way, the obtained graphite aluminum matrix composite of the embodiment of the present invention can utilize compared with continuous laminar configuration
Perforation structure, therefore introducing aluminium channel in the thickness direction of graphite film can be such that the thermal conductivity of thickness direction is improved, and
For direction in face, graphite film still has high-orientation, i.e., thermal conductivity maintains higher level in face.Moreover, because wearing
The parameters such as pore size (namely aperture) and punching rate can regulate and control in more broad range, described, the stone enabled to
The performance of black aluminum matrix composite regulates and controls in the larger context, meets the different demands of different heat management occasions.
Therefore, method described in the embodiment of the present invention is easy to operate, and preparation process is controllable, and structure parameters variation range is wide,
It can obtain the high-heat-conductive composite material with different performance.And the performance of composite material that the present embodiment obtains is close
Aluminium alloy has certain strength and toughness, can be used as structural material use.
The embodiment of the present invention is described in further details below in conjunction with specific example；Graphite used in the following embodiment
Film is mainly artificial synthesized graphite film, and aluminum substrate is mainly aluminium foil or aluminium sheet, and the composite material configuration being prepared mainly wraps
Include perforation configuration and continuous laminar configuration.
Embodiment one
A kind of graphite film/aluminium composite material (namely graphite aluminum matrix composite) with perforation configuration, the diameter of perforation
For 1.5mm, the arrangement mode of perforation is simple rectangular pitch, punching rate 10%.
Taking size is the graphite film of 35mm*10mm*29.5 μm (long * wide * is thick), with the punch of 1.5mm to the stone
Ink film carries out perforation processing, and perforation arrangement control is simple rectangular pitch, that is to say, that multiple perforation can make up rectangular
Shape, perforation number are 21, and punching rate is about 10%, are just there is the graphite of perforation structure (namely perforation configuration) after perforation processing
Film.It is dried for standby after being cleaned using graphite film of the acetone to perforation structure.
Taking size is 35mm*10mm*26 μm of 1060 aluminium foils (namely aluminum substrate of foil-like), wears it with above-mentioned
The graphite film of pore structure is compound, and here, the volume fraction of graphite film is controlled 53.2% or so.Specifically, to aluminium foil surface into
Row soda acid is washed to remove surface film oxide, is then placed in hot pressing die with the graphite film of perforation structure, is 655 in hot pressing temperature
DEG C, hot pressing pressure obtains graphite film/aluminium composite material of fine and close perforation configuration for hot pressing 100min under conditions of 45MPa.
The microstructure of composite that the present embodiment is prepared is fine and close, and graphite film and aluminium interface cohesion are good, thermal conductivity in face
About 618W/mK, thickness direction thermal conductivity are about 35W/mK.
Graphite film/aluminium composite material micro-structure diagram that Fig. 4 the present embodiment is prepared, as shown in figure 4, graphite film with
Interface cohesion is good between aluminum substrate.The degree of orientation of graphite film is higher, so that thermal conductivity is higher in the face of the composite material.
Further, compared with laminar configuration, aluminum substrate forms quick conductive channel in thickness direction in configuration of perforating, in this way, making
It obtains thickness of composite material direction thermal conductivity to be improved compared with laminar configuration, and then improves graphite film/aluminium composite material performance
Anisotropy.
Embodiment two
A kind of graphite film/aluminium composite material (namely graphite aluminum matrix composite) with laminar configuration, using not wearing
The graphite film and aluminium foil of hole processing are compound.
Taking size is 35mm*10mm*29.5 μm of graphite film, is dried for standby after being cleaned with acetone.Take size
For 35mm*10mm*26 μm of 1060 aluminium foils, keep it compound with above-mentioned graphite film, here, the volume fraction control of graphite film exists
53.2% or so.Specifically, soda acid is carried out to aluminium foil surface to wash to remove surface film oxide, be then placed in hot-die with graphite film
It is 655 DEG C in hot pressing temperature, hot pressing 100min is under conditions of hot pressing pressure is 45MPa to obtain fine and close laminar configuration in tool
Graphite film/aluminium composite material.
The microstructure of composite that the present embodiment is prepared is fine and close, and graphite film and aluminium interface cohesion are good, thermal conductivity in face
About 781W/mK, thickness direction thermal conductivity are about 11W/mK.
Embodiment three
A kind of graphite film/aluminium composite material (namely graphite aluminum matrix composite) with perforation configuration, the diameter of perforation
It is 200 μm, the arrangement mode of perforation is simple rectangular pitch, punching rate 1%.
Taking size is 10mm*10mm*29.5 μm of graphite film, is worn with 200 μm of punches to the graphite film
Hole processing, perforation arrangement control are simple rectangular pitch, and perforation number is 36, and punching rate is about 1%, after perforation processing
To the graphite film for just having perforation structure (namely perforation configuration).It is dried after being cleaned using graphite film of the acetone to perforation structure
It is spare.
Taking size is 10mm*10mm*13 μm of 1060 aluminium foils, keeps it compound with the graphite film of above-mentioned perforation structure,
Here, the volume fraction of graphite film is controlled 70% or so.Specifically, soda acid is carried out to aluminium foil surface to wash to remove surface oxidation
Then film is placed in hot pressing die with the graphite film of perforation structure, be 645 DEG C in hot pressing temperature, hot pressing pressure is the item of 20MPa
Hot pressing 100min is under part to obtain graphite film/aluminium composite material of fine and close perforation configuration.
The microstructure of composite that the present embodiment is prepared is fine and close, and graphite film and aluminium interface cohesion are good, thermal conductivity in face
About 896W/mK, thickness direction thermal conductivity are about 9W/mK.
Example IV
A kind of perforation configuration graphite film/aluminium composite material (namely graphite aluminum matrix composite), the diameter of perforation are
1.5mm, perforation arrangement are that the simple center of area is arranged, punching rate 10%.
Taking size is 35mm*10mm*29.5 μm of graphite film, is worn with the punch of 1.5mm to the graphite film
Hole processing, it is that the center of area is arranged that perforation, which is arranged and controlled, i.e. vertex and face heart position of the perforation positioned at composed quadrilateral units, is worn
Hole count is 20, and punching rate is about 10%, is just there is the graphite film of perforation structure (namely perforation configuration) after perforation processing.Benefit
It is dried for standby after being cleaned with graphite film of the acetone to perforation structure.
Taking size is 35mm*10mm*26 μm of 1060 aluminium foils, keeps it compound with above-mentioned perforation graphite film, here, stone
The volume fraction of ink film is controlled 17.4% or so.Specifically, soda acid is carried out to aluminium foil surface to wash to remove surface film oxide, so
It is placed in hot pressing die with the graphite film of perforation structure afterwards, is 655 DEG C in hot pressing temperature, under conditions of hot pressing pressure is 45MPa
Hot pressing 100min is to obtain graphite film/aluminium composite material of fine and close perforation configuration.
The microstructure of composite that the present embodiment is prepared is fine and close, and graphite film and aluminium interface cohesion are good, thermal conductivity in face
About 343W/mK, thickness direction thermal conductivity are about 33W/mK.
Embodiment five
A kind of graphite film/aluminium composite material (namely graphite aluminum matrix composite) with perforation configuration, the diameter of perforation
For 6mm, perforation arrangement is simple rectangular pitch, makes its punching rate 40%.
Taking size is 35mm*10mm*29.5 μm of graphite film, is perforated with the punch of 6mm to the graphite film
Processing, perforation arrangement control is simple rectangle, this is rectangular having a size of 30mm*6mm, and number of perforating is 5, and punching rate is about
40%, just there is the graphite film of perforation structure (namely perforation configuration) after perforation processing.Using acetone to the stone of perforation structure
Ink film is dried for standby after being cleaned.
Taking size is 35mm*10mm*140 μm of 1060 aluminium sheets, keeps it compound with the graphite film of above-mentioned perforation structure,
Here, the volume fraction of graphite film is controlled 11% or so.Specifically, soda acid is carried out to aluminium foil surface to wash to remove surface oxidation
Then film is placed in hot pressing die with the graphite film of perforation structure, be 660 DEG C in hot pressing temperature, hot pressing pressure is the item of 25MPa
Hot pressing 60min is under part to obtain graphite film/aluminium composite material of fine and close perforation configuration.
The microstructure of composite that the present embodiment is prepared is fine and close, and graphite film and aluminium interface cohesion are good, thermal conductivity in face
About 285W/mK, thickness direction thermal conductivity are about 39.9W/mK.
Embodiment six
A kind of graphite film/aluminium composite material (namely graphite aluminum matrix composite) with perforation configuration, the diameter of perforation
For 6mm, perforation arrangement is that simple polygon is arranged, and makes its punching rate 80%.
Taking size is 35mm*10mm*29.5 μm of graphene, is perforated with the punch of 6mm to the graphite film
Processing, perforation arrangement control be polygonal array, punching rate is about 80%, perforation processing after just had perforation structure (namely
Perforate configuration) graphite film.It is dried for standby after being cleaned using graphite film of the acetone to perforation structure.
Taking size is 35mm*10mm*140 μm of 1060 aluminium sheets, keeps it compound with the graphite film of above-mentioned perforation structure,
Here, the volume fraction of graphite film is controlled 53.2% or so.Specifically, soda acid is carried out to aluminium foil surface to wash to remove Surface Oxygen
Change film, be then placed in hot pressing die with the graphite film of perforation structure, is 660 DEG C in hot pressing temperature, hot pressing pressure is 25MPa's
Under the conditions of hot pressing 80min to obtain graphite film/aluminium composite material of fine and close perforation configuration.
The microstructure of composite that the present embodiment is prepared is fine and close, and graphite film and aluminium interface cohesion are good, thermal conductivity in face
About 619W/mK, thickness direction thermal conductivity are about 43W/mK.
Based on example given above it can be concluded that following performance table；As shown in the table.
Performance table
In conclusion the graphite aluminum matrix composite that the embodiment of the present invention obtains, can be improved the thermal conductivity in thickness direction
Rate improves compound property anisotropy.Moreover, method is easy to operate, preparation process is controllable, and structure parameters variation range is very
Extensively, convenient for obtaining the high-heat-conductive composite material with different performance, enable composite property more wide
Range value, to meet demand of the different heat management occasions to highly heat-conductive material.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of preparation method of graphite aluminum matrix composite, which is characterized in that the described method includes:
Configuration is carried out to graphite film, obtains structure parameters；
Perforation processing is carried out to the graphite film based on structure parameters, is obtained matched with perforation structure with the structure parameters
Graphite film；
It is sintered after being mixed with the matched graphite film with perforation structure of the structure parameters with aluminum substrate, makes aluminium
Matrix can at least run through the perforation structure, obtain graphite aluminum matrix composite.
2. the method according to claim 1, wherein the graphite film is artificial synthetic graphite film or graphene
Film；And/or
The aluminum substrate is aluminum or aluminum alloy；And/or
The aluminum substrate is that the following are at least one of shapes: foil-like, plate, powdery.
3. the method according to claim 1, wherein the structure parameters include at least one in following parameter
Kind: hole dimension, punching rate and the arrangement mode of perforation.
4. according to the method described in claim 3, it is characterized in that, the punching rate is to be less than or equal to 80% greater than 0；Alternatively,
The punching rate is 1%-40%.
5. according to the method described in claim 3, it is characterized in that, the arrangement mode of the perforation be following manner at least
It is a kind of: rectangular pitch, polygonal array, center of area arrangement.
6. method according to claim 1 or 3, which is characterized in that hole dimension is 200 μm of -6mm.
7. the method according to claim 1, wherein the volume of graphite film contains in the graphite aluminum matrix composite
Amount is 11-70%.
8. the method according to claim 1, wherein the sintering processes, comprising:
It is 645-660 DEG C in temperature, and/or, pressure 20-45MPa, and/or, under conditions of sintering time is 60-100min
It is sintered.
9. the method according to claim 1, wherein described will be matched with perforation knot with the structure parameters
Before the graphite film of structure is sintered after mixing with aluminum substrate, the method also includes:
The graphite film with perforation structure is cleaned using acetone.
10. a kind of graphite aluminum matrix composite, which is characterized in that the graphite aluminum matrix composite is that claim 1 to 9 is made
Standby obtained graphite aluminum matrix composite.
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| CN112339359A (en) * | 2020-09-23 | 2021-02-09 | 中国电子科技集团公司第二十九研究所 | Aluminum-graphite aluminum composite material structure for enhancing longitudinal heat conductivity coefficient |
| WO2021119384A1 (en) | 2019-12-13 | 2021-06-17 | All-Clad Metalcrafters, L.L.C. | Cookware having a graphite core |
| 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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| WO2021119384A1 (en) | 2019-12-13 | 2021-06-17 | All-Clad Metalcrafters, L.L.C. | Cookware having a graphite core |
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Application publication date: 20190528 |