CN102344780B - Composite heat dissipating graphite material and manufacturing method thereof - Google Patents
Composite heat dissipating graphite material and manufacturing method thereof Download PDFInfo
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- CN102344780B CN102344780B CN201010245745.6A CN201010245745A CN102344780B CN 102344780 B CN102344780 B CN 102344780B CN 201010245745 A CN201010245745 A CN 201010245745A CN 102344780 B CN102344780 B CN 102344780B
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Abstract
The invention provides a composite heat dissipating graphite material and a manufacturing method thereof, belonging to the field of heat dissipating products. The composite heat dissipating graphite material comprises a graphite material body, and a surface hot-melt metal body which is even with the surface of the graphite material body or higher than the surface of the graphite material body. The manufacturing method comprises the following steps: heating the graphite material body to below, within or above the temperature with which a hot-melt metal base material can be melted, and dispersing the hot-melt metal base material on the high temperature graphite material body; carrying out hot melting treatment on the metal base material on the surface of the graphite material to form the hot-melt metal body; and cooling the graphite material body having the hot-melt metal body to obtain the composite heat dissipating graphite material. According to the invention, the combination of heat dissipating material and heating parts is reinforced, and the heat dissipating performance is improved.
Description
Technical field
The invention belongs to heat sink article field, the structure formation of particularly a kind of height heat radiation realized by graphite products.
Background technology
Current, the tempo of various electronic product quickly.Such as, the notebook computer that we often use or mobile phone, its arithmetic speed is more and more faster, function from strength to strength, size is more and more less simultaneously.Can also in this case, while how making the performance of computer be promoted, reduce size? on the basis of development related hardware technology and software engineering, also having a great difficulty to need to overcome, is exactly the heat dissipation problem of product.
How to solve the heat dissipation problem of product, have various solution.Current electronic product, such as, the arithmetic processor of notebook computer, is provided with compulsory fan usually, and be used for dispel the heat radiator element.The radiator element adopted is mostly the good copper product of the capacity of heat transmission.But, use heat sink material, have some difficulties to need to overcome.First, be exactly between heat sink material and heat generating components, usually have gap, this gap is either large or small, all can affect radiating efficiency.In addition, the heat dispersion of high heat sink material, has conclusive impact to radiating effect equally.
In recent years, graphite, as high thermal conductivity material, is subject to the attention of numerous researchist.Because the wetting property of graphite and metal is poor, scientific research personnel proposes the metal such as copper or aluminium to be distributed in graphite particle as joint material, forms decentralized compound system.Such as, Chinese patent (application number 200580049340) proposes a kind of high heat conductance graphite particle decentralized complex body and manufacture method thereof, form with the graphite particle solidification that the high heat conductivity metal such as silver, copper, aluminium carry out being coated to, by regulating and controlling the volume ratio of graphite particle and metal, the engaging force of regulation and control composite base material and relational structure.
Summary of the invention
Object of the present invention, is to provide a kind of composite heat-conducting graphite material and manufacture method, thus can realize good heat conduction function, and, make between product and heat generating components, there is good intervention relation.
Composite heat-dissipating graphite material of the present invention, it comprises graphite material body, this graphite material body is provided with hot-melting type metallic object, wherein, described hot-melting type metallic object is by hot-melting type metal base graphite material body at high operating temperatures occurring melt the metal dots formed.
Further, described composite heat-dissipating graphite material, also has following technical characteristic:
Described graphite material body is the laminate structure be made up of graphite.
Described hot-melting type metal base is at least one in silver, gold, copper, aluminium.
Described hot-melting type metallic object is arranged on the surface of graphite material body.
Described hot-melting type metallic object is that regular distribution shape is arranged on the surface of graphite material body.
The surface of described hot-melting type metallic object is equal with the surface of graphite material body, or higher than the surface of graphite material body.
Another object of the present invention is the manufacture method proposing this composite heat-dissipating graphite material, and the method includes following steps:
Step 1, manufactures the graphite material body be made up of graphite substrate;
Step 2, before graphite material body is heated to the temperature range that hot-melting type metal base can melt among or afterwards, hot-melting type metal base is distributed in described pyrographite material body;
Step 3, metal base carries out hot melt process on graphite material surface, forms hot-melting type metallic object;
Step 4, by the graphite material body cooling with hot-melting type metallic object obtained by step 3, obtains composite heat-dissipating graphite material.
Further, described composite heat-dissipating graphite material, also has following technical characteristic:
Described graphite material body is the laminate structure be made up of graphite.
Described hot-melting type metal base is at least one in silver, gold, copper, aluminium.
The surface of described hot-melting type metallic object is equal with the surface of described graphite material body, or higher than the surface of graphite material body, its formation condition comprises following at least one:
(1) pass through the heating mode of regulation and control graphite material body, temperature rise rate or real time temperature, control the melting situation of hot-melting type metal base on graphite material body,
(2) by rate of temperature fall or the cooling method of regulation and control graphite material body, form different falling temperature gradient, control the solidification situation of hot-melting type metal base on graphite material body.
The invention has the advantages that:
Composite heat-dissipating graphite material of the present invention, comprises graphite material body, and this graphite material body is provided with hot-melting type metallic object, and the surface of this hot-melting type metallic object is equal with the surface of graphite material body, or higher than the surface of graphite material body.Compared with conventional art, tool has the following advantages:
(1) arrange the good metal of heat conductivility on the surface of graphite substrate, this metal forms contact on graphite substrate surface, thus strengthens the combination of heat sink material and heat generating components;
(2) adopt graphite to be used as heat sink material, thus improve its heat dispersion.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be described in more detail.
Fig. 1 is the structure iron of composite heat-dissipating graphite material of the present invention.
Fig. 2 is the schema of the manufacture method of composite heat-dissipating graphite material of the present invention.
Fig. 3 a is the schematic diagram of a kind of embodiment forming hot-melting type metallic object on graphite material body, before hot melt.
Fig. 3 b is the schematic diagram of a kind of embodiment forming hot-melting type metallic object on graphite material body, after hot melt.
Embodiment
With reference to the accompanying drawings, the present invention is described further in conjunction with specific embodiments.
As shown in Figure 1, composite heat-dissipating graphite material 100 of the present invention, comprises graphite material body 200, and this graphite material body 200 is provided with hot-melting type metallic object 300.Wherein, described graphite material body 200 is by graphite substrate, such as, at least one in pyrolytic graphite, kish and natural graphite, carries out mechanical workout, or carrying out high temperature carbonization process and other forming processes obtain, the fusing point of its correspondence is generally more than 3000 DEG C.Correspond to concrete radiator structure, can the structure of this graphite material body 200 prefabricated, such as, it can be the wire of one dimension, strip, thread, banded, may also be the lamelliform such as tetragon, circle, Polygons of two dimension, may also be the structures such as the hexahedron of three-dimensional.In the present invention, for example and without limitation, as shown in Figure 1, described graphite material body 200, preferably has the two dimensional surface shape of laminate structure.
Aforesaid graphite material body 200 is provided with hot-melting type metallic object 300, and this hot-melting type metallic object 300 is by hot-melting type metal base graphite material body 200 at high operating temperatures occurring melt the metal dots formed.It is arranged on the surface corresponding with heater block on graphite material body 200, and in regular distribution shape.Wherein, described hot-melting type metal base is at least one in silver that heat conductivility is good, gold, copper, aluminium, and particularly, silver point is 961.8 DEG C, and boiling point is 2213 DEG C; The fusing point of gold is 1064 DEG C, and boiling point is 2807 DEG C; The fusing point of copper is 1083.4 DEG C, and boiling point is 2567 DEG C; The fusing point of aluminium is 660.4 DEG C, and boiling point is 2467.0 DEG C.
As innovative point of the present invention, the surface of this hot-melting type metallic object 300 is equal with the surface of graphite material body, or higher than the surface of graphite material body.In the present invention, preferably by the surface of the surface of hot-melting type metallic object 300 higher than graphite material body.Like this, on the one hand, the contact of this hot-melting type metallic object 300 can be got involved in heat generating components better, thus strengthens the combination of heat sink material and heat generating components; On the other hand, hot-melting type metallic object 300 itself is the good thermally conductive material of heat dispersion, as the heat radiation contact be arranged on graphite material body 200, can accelerate the conduction of heat, thus reach better radiating effect.
It should be noted that in the present invention, the surface of described hot-melting type metallic object is higher than the surface of graphite material body, and its formation condition can comprise following at least one:
(1) by regulating and controlling the heating mode of graphite material body (such as, type of heating: microwave heating, electric-arc heating, Resistant heating etc.), temperature rise rate (such as, be rapidly heated 50 DEG C/s, heat up at a slow speed 5 DEG C/s etc.) or the real time temperature (melting temperature of hot-melting type metal, or, higher than the melting temperature of hot-melting type metal lower than the arbitrary temp between its boiling point), control the melting situation of hot-melting type metal base on graphite material body;
(2) by regulating and controlling the rate of temperature fall of graphite material body (such as, fast cooling 80 DEG C/s, lower the temperature at a slow speed 10 DEG C/s etc.) or cooling method (condensed fluid, as water, liquid nitrogen etc., air blast cooling etc.), form different falling temperature gradient, control the solidification situation of hot-melting type metal base on graphite material body.
With reference to the schema of the manufacture method of the composite heat-dissipating graphite material shown in Fig. 2, using argent as hot-melting type metal base, the fusing point of its correspondence is 961.8 DEG C, and boiling point is 2213 DEG C,
Specific as follows explanation.
As shown in Figure 3 a, the graphite material body 200 with laminate structure is first prepared by graphite substrate, simultaneously, by hot-melting type metallic silver for monodispersed miniature Argent grain 400, according to real needs, the visual particular case of granularity of this Argent grain 400 and arranging, generally between micron order or Nano grade.
It is 961.8 DEG C according to silver point, boiling point is 2213 DEG C, graphite material body 200 is heated to (961.8 DEG C, 2213 DEG C) temperature range, such as, the temperature of graphite material body 200 can be 1000 DEG C, 1500 DEG C, 2000 DEG C, and namely the temperature range of melting can occur argent.
As shown in Figure 3 b, when the temperature of graphite material body 200 rises to (961.8 DEG C, 2213 DEG C) temperature range in time, namely the Argent grain 400 being arranged on graphite material body 200 surface melts, and namely the silver being in molten state can partly be got involved in graphite material body 200.
The graphite material body cooling of the condition of high temperature will be in, the part do not got involved, along with the temperature-fall period curing molding of graphite material body, graphite material body 200 is formed the contact higher than graphite material body surface, obtain hot-melting type metallic object 300, thus be prepared into the composite heat-dissipating graphite material with hot-melting type argent.
Be more than the description of this invention and non-limiting, based on other embodiment of inventive concept, all among protection scope of the present invention.
Claims (10)
1. a composite heat-dissipating graphite material, it comprises graphite material body, it is characterized in that:
This graphite material body is provided with hot-melting type metallic object, and wherein, described hot-melting type metallic object is by hot-melting type metal base graphite material body at high operating temperatures occurring melt the metal dots formed.
2. a kind of composite heat-dissipating graphite material according to claim 1, is characterized in that: described graphite material body is the laminate structure be made up of graphite.
3. a kind of composite heat-dissipating graphite material according to claim 1, is characterized in that: described hot-melting type metal is at least one in silver, gold, copper, aluminium.
4. a kind of composite heat-dissipating graphite material according to claim 1, is characterized in that: described hot-melting type metallic object is arranged on the outside surface of graphite material body.
5. a kind of composite heat-dissipating graphite material according to claim 3, is characterized in that: described hot-melting type metallic object is that regular distribution shape is arranged on the outside surface of graphite material body.
6. a kind of composite heat-dissipating graphite material according to claim 3, is characterized in that: the surface of described hot-melting type metallic object is equal with the surface of graphite material body, or higher than the surface of graphite material body.
7. a manufacture method for composite heat-dissipating graphite material, is characterized in that the method includes following steps:
Step 1, manufactures the graphite material body be made up of graphite substrate;
Step 2, before graphite material body is heated to the temperature range that hot-melting type metal base can melt among or afterwards, hot-melting type metal base is distributed in described pyrographite material body;
Step 3, metal base carries out hot melt process on graphite material surface, forms hot-melting type metallic object;
Step 4, by the graphite material body cooling with hot-melting type metallic object obtained by step 3, obtains composite heat-dissipating graphite material.
8. the manufacture method of a kind of composite heat-dissipating graphite material according to claim 7, is characterized in that: described graphite material body is the laminate structure be made up of graphite.
9. the manufacture method of a kind of composite heat-dissipating graphite material according to claim 7, is characterized in that: described hot-melting type metal base is at least one in silver, gold, copper, aluminium.
10. the manufacture method of a kind of composite heat-dissipating graphite material according to claim 7, it is characterized in that: the surface of described hot-melting type metallic object is equal with the surface of described graphite material body, or higher than the surface of graphite material body, its formation condition comprises following at least one:
(1) pass through the heating mode of regulation and control graphite material body, temperature rise rate or real time temperature, control the melting situation of hot-melting type metal base on graphite material body,
(2) by rate of temperature fall or the cooling method of regulation and control graphite material body, form different falling temperature gradient, control the solidification situation of hot-melting type metal base on graphite material body.
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| CN201010245745.6A CN102344780B (en) | 2010-08-05 | 2010-08-05 | Composite heat dissipating graphite material and manufacturing method thereof |
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| 《Ti 对C/Cu 复合材料界面润湿及浸渗组织的影响》;胡锐等;《中国有色金属学报》;20080515;第18卷(第5期);第840-844页 * |
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Address after: 213145 Jiangsu city of Changzhou province Wujin Lanxiang Road Economic Development Zone No. 7 Applicant after: TANYUAN TECHNOLOGY Co.,Ltd. Address before: 306 room 213122, building A, 18 Huashan Road, Xinbei District, Jiangsu, Changzhou Applicant before: TANYUAN TECHNOLOGY Co.,Ltd. |
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