CN102344780A - 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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- CN102344780A CN102344780A CN2010102457456A CN201010245745A CN102344780A CN 102344780 A CN102344780 A CN 102344780A CN 2010102457456 A CN2010102457456 A CN 2010102457456A CN 201010245745 A CN201010245745 A CN 201010245745A CN 102344780 A CN102344780 A CN 102344780A
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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 the heat sink article field, the structure formation that particularly a kind of height of realizing through graphite products dispels the heat.
Background technology
Current, the tempo of various electronic products is very fast.Such as, notebook computer or mobile phone that we often use, its arithmetic speed is more and more faster, function from strength to strength, size is more and more littler simultaneously.Can also in this case, when how to make the performance of computer be able to promote, reduce size? On the basis of development related hardware technology and software engineering, also have a great difficulty to overcome, be exactly the heat dissipation problem of product.
How to solve the heat dissipation problem of product, various solutions are arranged.Current electronic product, such as, the arithmetic processor of notebook computer is provided with compulsory fan usually, and the radiator element that is used for dispelling the heat.The radiator element that is adopted mostly is the good copper product of the capacity of heat transmission.But, use heat sink material, there are some difficulties to overcome.At first, be exactly between heat sink material and the heat generating components, have the slit usually, this slit is either large or small, all can influence radiating efficiency.In addition, the heat dispersion of high heat sink material has decisive influence to radiating effect equally.
In recent years, graphite receives numerous researchists' attention as high thermal conductivity material.Because the wetting property of graphite and metal is poor, the scientific research personnel proposes metals such as copper or aluminium are distributed in the graphite particle as engaging material, forms the decentralized compound system.For example; Chinese patent (application number 200580049340) has proposed a kind of high heat conductance graphite particle decentralized complex body and method of manufacture thereof; The graphite particle curing that is covered with high heat conductivity metal such as silver, copper, aluminium forms; Through the volume ratio of regulation and control graphite particle and metal, the engaging force of regulation and control composite base material and relational structure.
Summary of the invention
The object of the invention provides a kind of composite heat-conducting graphite material and method of manufacture, thereby can realize good heat conduction function, and making has good intervention relation between product and the heat generating components.
Composite radiating graphite material of the present invention; It comprises the graphite material body; This graphite material body is provided with the hot-melting type metallic object; Wherein, described hot-melting type metallic object is through the hot-melting type metal base the formed metal dots of fusion to take place on the graphite material body under the condition of high temperature.
Further, described composite radiating graphite material also has following technical characterictic:
Described graphite material body is the laminate structure of being made up of graphite.
Described hot-melting type metal base is at least a in silver, gold, copper, the aluminium.
Described hot-melting type metallic object is arranged on the surface of graphite material body.
Described hot-melting type metallic object is on the surface that the regular distribution shape is arranged on the graphite material body.
The surface of described hot-melting type metallic object is surperficial equal with the graphite material body, or is higher than the surface of graphite material body.
Another object of the present invention is the method for manufacture that has proposed this composite radiating graphite material, and this method includes following steps:
Step 1 is made the graphite material body of being made up of graphite substrate;
Step 2, before the graphite material body is heated to the temperature range that the hot-melting type metal base can fuse among or afterwards, the hot-melting type metal base is distributed on the described pyrographite material body;
Step 3, metal base are carried out hot melt and are handled formation hot-melting type metallic object on the graphite material surface;
Step 4 with the prepared graphite material body cooling with hot-melting type metallic object of step 3, promptly gets the composite radiating graphite material.
Further, described composite radiating graphite material also has following technical characterictic:
Described graphite material body is the laminate structure of being made up of graphite.
Described hot-melting type metal base is at least a in silver, gold, copper, the aluminium.
The surface of described hot-melting type metallic object is surperficial equal with described graphite material body, or is higher than the surface of graphite material body, and its formation condition comprises as follows one of which at least:
(1) through heating mode, temperature rise rate or the real time temperature of regulation and control graphite material body, control the fusion situation of hot-melting type metal base on the graphite material body,
(2) through the rate of temperature fall or the cooling method of regulation and control graphite material body, form different cooling gradients, the curing situation of control hot-melting type metal base on the graphite material body.
The invention has the advantages that:
Composite radiating graphite material of the present invention comprises the graphite material body, and this graphite material body is provided with the hot-melting type metallic object, and the surface of this hot-melting type metallic object is surperficial equal with the graphite material body, or is higher than the surface of graphite material body.Compare with conventional art, have following advantage:
(1) on the surface of graphite substrate the heat conductivility good metal is set, this metal forms the contact on graphite substrate surface, thereby has strengthened combining of heat sink material and heat generating components;
(2) adopt graphite to be used as heat sink material, thereby improve its heat dispersion.
Description of drawings
The present invention will be described in more detail below in conjunction with accompanying drawing.
Fig. 1 is the structure iron of composite radiating graphite material of the present invention.
Fig. 2 is the schema of the method for manufacture of composite radiating graphite material of the present invention.
Fig. 3 a is the synoptic diagram that on the graphite material body, forms a kind of embodiment of hot-melting type metallic object, before the hot melt.
Fig. 3 b is the synoptic diagram that on the graphite material body, forms a kind of embodiment of hot-melting type metallic object, behind the hot melt.
Embodiment
With reference to the accompanying drawings, in conjunction with specific embodiment the present invention is done further explanation.
As shown in Figure 1, composite radiating 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 through to graphite substrate; For example, at least a in pyrolytic graphite, kish and the natural graphite carries out mechanical workout; Or carrying out that high temperature carbonization is handled and other forming processes obtain, its corresponding fusing point is generally more than 3000 ℃.Corresponding concrete radiator structure; Structure that can prefabricated this graphite material body 200, for example, it can be unidimensional wire, strip, thread, banded; Also lamelliforms such as the tetragon of two dimension, circle, Polygons, also structure such as three-dimensional hexahedron.In the present invention, non-limiting as giving an example, as shown in Figure 1, and described graphite material body 200, the two dimensional that preferably has laminate structure is planar.
Aforesaid graphite material body 200 is provided with hot-melting type metallic object 300, and this hot-melting type metallic object 300 is through the hot-melting type metal base metal dots that fusion forms to take place on the graphite material body 200 under the condition of high temperature.It is arranged on the graphite material body 200 with the corresponding surface of heater block on, and be the regular distribution shape.Wherein, described hot-melting type metal base is at least a in the good silver of heat conductivility, gold, copper, the aluminium, and particularly, silver point is 961.8 ℃, and boiling point is 2213 ℃; The fusing point of gold is 1064 ℃, and boiling point is 2807 ℃; The fusing point of copper is 1083.4 ℃, and boiling point is 2567 ℃; The fusing point of aluminium is 660.4 ℃, and boiling point is 2467.0 ℃.
As innovative point of the present invention, the surface of this hot-melting type metallic object 300 is surperficial equal with the graphite material body, or is higher than the surface of graphite material body.In the present invention, the surface that preferably surface of hot-melting type metallic object 300 is higher than the graphite material body.Like this, on the one hand, the contact of this hot-melting type metallic object 300 can be got involved in the heat generating components better, thereby has strengthened combining 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 that is arranged on the graphite material body 200, can quicken the conduction of heat, thereby 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, its formation condition can comprise as follows one of which at least:
(1) heating mode through regulation and control graphite material body (for example; Type of heating: microwave heating, electric-arc heating, resistance wire heating etc.), temperature rise rate (for example; 50 ℃/s is rapidly heated; 5 ℃/s etc. heats up at a slow speed) or the real time temperature (melting temperature of hot-melting type metal; Perhaps; Be higher than the melting temperature of hot-melting type metal and be lower than the arbitrary temp between its boiling point), the fusion situation of control hot-melting type metal base on the graphite material body;
(2) rate of temperature fall through regulation and control graphite material body (for example; 80 ℃/s of fast cooling; 10 ℃/s etc. lowers the temperature at a slow speed) or cooling method (condensed fluid; Like water, liquid nitrogen etc.; Air blast cooling etc.); Form different cooling gradients, the curing situation of control hot-melting type metal base on the graphite material body.
The schema of the method for manufacture of the composite radiating graphite material that reference is shown in Figure 2, as the hot-melting type metal base, its corresponding fusing point is 961.8 ℃ with argent, boiling point is 2213 ℃,
Specific as follows explanation.
Shown in Fig. 3 a, at first has the graphite material body 200 of laminate structure, simultaneously by the graphite substrate preparation; Prepare monodispersed miniature silver-colored particle 400 by the hot-melting type argent; According to real needs, the visual particular case of the granularity of this silver particle 400 and being provided with is generally between micron order or Nano grade.
According to silver point is 961.8 ℃, and boiling point is 2213 ℃, and graphite material body 200 is heated to (961.8 ℃; 2213 ℃) temperature range; For example, the temperature of graphite material body 200 can be 1000 ℃, 1500 ℃, 2000 ℃ all can, i.e. the temperature range that can fuse of argent.
Shown in Fig. 3 b; When the temperature of graphite material body 200 rises to (961.8 ℃; 2213 ℃) temperature range in the time, the silver-colored particles 400 that are arranged on graphite material body 200 surface promptly fuse, the silver that is in molten state promptly can partly be got involved in the graphite material body 200.
To be in the graphite material body cooling of the condition of high temperature; The part of Jie Ruing not; Be accompanied by the temperature-fall period curing molding of graphite material body; On graphite material body 200, form the contact that is higher than the graphite material body surface; Promptly get hot-melting type metallic object 300, thereby be prepared into composite radiating graphite material with hot-melting type argent.
More than be 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. composite radiating graphite material, it comprises the graphite material body, it is characterized in that:
This graphite material body is provided with the hot-melting type metallic object, and wherein, described hot-melting type metallic object is through the hot-melting type metal base the formed metal dots of fusion to take place on the graphite material body under the condition of high temperature.
2. a kind of composite radiating graphite material according to claim 1 is characterized in that: the laminate structure of described graphite material body for being made up of graphite.
3. a kind of composite radiating graphite material according to claim 1 is characterized in that: described hot-melting type metal is at least a in silver, gold, copper, the aluminium.
4. a kind of composite radiating 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 radiating graphite material according to claim 3 is characterized in that: described hot-melting type metallic object is on the outside surface that the regular distribution shape is arranged on the graphite material body.
6. a kind of composite radiating graphite material according to claim 3 is characterized in that: the surface of described hot-melting type metallic object is surperficial equal with the graphite material body, or is higher than the surface of graphite material body.
7. the method for manufacture of a composite radiating graphite material is characterized in that this method includes following steps:
Step 1 is made the graphite material body of being made up of graphite substrate;
Step 2, before the graphite material body is heated to the temperature range that the hot-melting type metal base can fuse among or afterwards, the hot-melting type metal base is distributed on the described pyrographite material body;
Step 3, metal base are carried out hot melt and are handled formation hot-melting type metallic object on the graphite material surface;
Step 4 with the prepared graphite material body cooling with hot-melting type metallic object of step 3, promptly gets the composite radiating graphite material.
8. the method for manufacture of a kind of composite radiating graphite material according to claim 7 is characterized in that: the laminate structure of described graphite material body for being made up of graphite.
9. the method for manufacture of a kind of composite radiating graphite material according to claim 7 is characterized in that: described hot-melting type metal base is at least a in silver, gold, copper, the aluminium.
10. the method for manufacture of a kind of composite radiating graphite material according to claim 7; It is characterized in that: the surface of described hot-melting type metallic object is surperficial equal with described graphite material body; Or be higher than the surface of graphite material body, its formation condition comprises as follows one of which at least:
(1) through heating mode, temperature rise rate or the real time temperature of regulation and control graphite material body, control the fusion situation of hot-melting type metal base on the graphite material body,
(2) through the rate of temperature fall or the cooling method of regulation and control graphite material body, form different cooling gradients, the curing situation of control hot-melting type metal base on the graphite material body.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105081333A (en) * | 2014-05-20 | 2015-11-25 | 中国科学院宁波材料技术与工程研究所 | Graphite-metal heat conduction composite material and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201785338U (en) * | 2010-08-05 | 2011-04-06 | 徐世中 | Composite heat-dissipating graphite material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201785338U (en) * | 2010-08-05 | 2011-04-06 | 徐世中 | Composite heat-dissipating graphite material |
Non-Patent Citations (1)
| Title |
|---|
| 胡锐等: "《Ti 对C/Cu 复合材料界面润湿及浸渗组织的影响》", 《中国有色金属学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105081333A (en) * | 2014-05-20 | 2015-11-25 | 中国科学院宁波材料技术与工程研究所 | Graphite-metal heat conduction composite material and preparation method thereof |
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Address after: 306 room 213122, building A, 18 Huashan Road, Xinbei District, Jiangsu, Changzhou Applicant after: TANYUAN TECHNOLOGY Co.,Ltd. Address before: 306 room 213122, building A, 18 Huashan Road, Xinbei District, Jiangsu, Changzhou Applicant before: Jiangsu carbon dollar Polytron Technologies Inc. Address after: 306 room 213122, building A, 18 Huashan Road, Xinbei District, Jiangsu, Changzhou Applicant after: Jiangsu carbon dollar Polytron Technologies Inc. Address before: 306 room 213122, building A, 18 Huashan Road, Xinbei District, Jiangsu, Changzhou Applicant before: CHANGZHOU TANYUAN TECHNOLOGY DEVELOPMENT Co.,Ltd. |
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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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