CN203032018U - Adhesive film-free metal foil-graphite heat-conducting composite - Google Patents

Abstract

The utility model discloses an adhesive film-free metal foil-graphite heat-conducting composite. An aluminum foil substrate or a copper foil substrate and a graphite coating formed by coating graphite powder paint on the bottom surface or the surface layer of the aluminum foil substrate or the copper foil substrate constitute an aluminum foil-graphite heat-conducting composite or a copper foil-graphite heat-conducting composite. The graphite coating is formed by coating the graphite powder paint on the bottom surface or the surface layer of the aluminum foil substrate or the copper foil substrate. The graphite coating is 3-30 micrometers in thickness. The aluminum foil substrate and the copper foil substrate are 7-100 micrometers and 15-100 micrometers in thickness. The heat conductivity of the aluminum foil substrate is 230W/M*K. The heat conductivity of the copper foil substrate is 380W/M*K. The composite is easy to manufacture, can be cut and stamped into any shape, and can be smoothly attached to any plane and bent surface. The aluminum foil substrate or the copper foil substrate is composited with the graphite coating, so that the heat-conducting property is improved.

Description

Metal foil graphite thermally conductive composite without adhesive film

technical field

The utility model belongs to the technical field of interface heat-conducting materials, and relates to a metal foil graphite heat-conducting composite material without an adhesive film. the

Background technique

With the acceleration of the upgrading of electronic products and the increasing number of miniature, highly integrated and high-performance electronic devices, the heat conduction or heat dissipation technology of electronic products is changing with each passing day. The heat dissipation effect of heat-conducting materials becomes the key to the miniaturization design of the whole machine. In order to ensure the steady-state operation of electronic devices or equipment, it is necessary to dissipate the generated heat in time and remove hot spots. Therefore, higher requirements are put forward for the quality and thermal conductivity of thermal conductive materials. the

In the prior art, Chinese Invention Patent Application Publication No. CN102039716A, application publication date May 04, 2011, "Method for Manufacturing Conductive and Thermally Conductive Graphite Strips" discloses that the conductive and thermally conductive graphite strips are sprayed by graphite powder on the substrate with the base film through a powder spraying machine. On the film glue, the graphite powder and the film are rolled and flattened. The base film is polyimide film or polyester film; the adhesive film is acrylate rubber pressure-sensitive adhesive. the

Its disadvantages: the thermal conductivity of polyimide film or polyester film base film is low, and the thermal conductivity of both materials is below 0.4 W/M K. The thermal resistance is increased due to the use of an acrylate rubber pressure-sensitive adhesive film as an adhesive. The use of base film and adhesive film reduces the thermal conductivity of this product. the

Commercially available metal foils - aluminum foil and copper foil are widely used for their lightness, thinness and good thermal conductivity. However, in practical applications, aluminum foil and copper foil exposed to the air are easily oxidized, thereby reducing their thermal conductivity. How to maintain the good thermal conductivity of aluminum foil and copper foil, so that the thermal conductive composite material has high thermal conductivity, is an urgent problem to be solved in the field of interface thermal conductive material engineering technology. the

Utility model content

The purpose of the utility model is to aim at the technical defects existing in the prior art, and to provide a metal foil graphite heat-conducting composite material without an adhesive film. The heat-conducting material has high heat conduction efficiency, is not easily oxidized, is light in weight, and has bending resistance. Attaches smoothly to any flat and curved surface. the

For realizing the purpose of this utility model, the technical scheme adopted is:

A metal foil graphite heat-conducting composite material without an adhesive film, characterized in that: the metal foil is an aluminum foil material and a copper foil material, and the aluminum foil material and the copper foil material are respectively used as an aluminum foil base material and a copper foil base material, and the The metal foil graphite heat-conducting composite material without adhesive film is composed of aluminum foil base material or copper foil base material and graphite coated on the bottom surface or surface layer of aluminum foil base material or the bottom surface or surface layer of copper foil base material respectively. Powder paint molding graphite coating composition .

The graphite coating is designed to have a thickness of 3 μm to 30 μm. the

The thickness of the aluminum foil substrate is designed to be 7 μm to 100 μm. the

The thickness of the copper foil substrate is designed to be 15 μm to 100 μm. the

The aluminum foil base material has a thermal conductivity of 230 W/M·K. the

The copper foil base material has a thermal conductivity of 380 W/M·K. the

Advantages and beneficial effects

Compared with the prior art, the utility model has the following advantages and beneficial effects:

advantage

Easy to make, light in weight, can be cut and punched into any shape, can be bent multiple times, has good bending resistance, can be smoothly attached to any flat or curved surface, and has a beautiful appearance.

Beneficial effect

1. Aluminum foil or copper foil base material is compounded with graphite coating to enhance thermal conductivity. the

2. Reduce dust pollution. the

Description of drawings

Fig. 1 is the structural representation of the aluminum foil graphite heat-conducting composite material without adhesive film of the present invention;

Fig. 2 is a schematic structural view of the copper foil graphite heat-conducting composite material without an adhesive film of the present invention.

In Figure 1: 1-graphite coating; 2-aluminum foil substrate. the

In Fig. 2: 1 - graphite coating; 3 - copper foil substrate. the

Detailed ways

Below in conjunction with embodiment the utility model is further described. the

Example 1

A metal foil graphite heat-conducting composite material without an adhesive film, the metal foil is an aluminum foil material as an aluminum foil base material 2, the aluminum foil base material 2 and the graphite powder coating coated on the bottom surface or surface layer of the aluminum foil base material 2 The formed graphite coating 1 constitutes an aluminum foil graphite heat-conducting composite material. As shown in FIG. . the

The graphite coating 1 is designed to have a thickness of 3 μm to 30 μm, and the utility model is designed to be 5 μm. the

The thickness of the aluminum foil substrate 2 is designed to be 7 μm to 100 μm, and the thickness of the utility model is designed to be 12 μm. the

The aluminum foil substrate 2 has a thermal conductivity of 230 W/M·K. the

Example 2

A metal foil graphite heat-conducting composite material without an adhesive film, the metal foil is a copper foil material as a copper foil base material 3, and the copper foil base material 3 is coated on the bottom surface or the surface layer of the copper foil base material 3 The graphite coating 1 formed by the graphite powder coating constitutes a copper foil graphite heat-conducting composite material. As shown in Figure 2, the graphite coating 1 is coated on the bottom surface or surface layer of the copper foil substrate 3 by the graphite powder coating Formed graphite coating 1. the

The graphite coating 1 is designed to have a thickness of 3 μm to 30 μm, and the utility model is designed to be 5 μm. the

The thickness of the copper foil substrate 3 is designed to be 15 μm to 100 μm, and the thickness of the utility model is designed to be 20 μm. the

The copper foil substrate 3 has a thermal conductivity of 380 W/M·K. the

Aluminum foil in the utility model, copper foil, graphite powder are all commercially available products. the

In the utility model, since the aluminum foil rolled by pure aluminum is used as the base material of the heat-conducting material, its thermal conductivity is 230 W/M K, and the thermal conductivity of the aluminum foil is second only to silver, gold and copper, which is about 60% of that of copper. . Graphite coating 1 formed by coating graphite powder paint on the bottom or surface of aluminum foil substrate 2 constitutes a thermally conductive material, or coating graphite on the bottom or surface of copper foil substrate 3 with a thermal conductivity of 380 W/M K The graphite coating 1 formed by the powder coating constitutes a thermally conductive material, thereby optimizing the thermal conductivity of the aluminum foil-graphite thermally conductive material or the copper foil-graphite thermally conductive material, and providing the possibility for the thinning development of electronic products. the

The metal foil graphite heat-conducting composite material without adhesive film of the utility model is applied to electronic products such as notebook computers, high-power LED lighting lamps, flat panel displays, and mobile phones. the

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the structure of the present utility model in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model still belong to the scope of the technical solution of the present utility model. the

Claims (6)

1. A metal foil graphite heat-conducting composite material without an adhesive film, characterized in that: the metal foil is an aluminum foil material and a copper foil material, and the aluminum foil material and the copper foil material are used as the aluminum foil base material (1) and the copper foil material respectively The foil base material (3), the metal foil graphite heat-conducting composite material without an adhesive film, is composed of an aluminum foil base material (1) or a copper foil base material (3) and the bottom surface or surface layer of the aluminum foil base material (1) The graphite coating (2) formed by graphite powder coating on the bottom surface or the surface layer of the copper foil substrate (3). 2. The film-free metal foil graphite heat-conducting composite material according to claim 1, characterized in that: the thickness of the graphite coating (2) is designed to be 3 μm to 30 μm. 3. The metal foil-graphite heat-conducting composite material without adhesive film according to claim 1, characterized in that: the thickness of the aluminum foil substrate (1) is designed to be 7 μm-100 μm. 4. The metal foil-graphite heat-conducting composite material without adhesive film according to claim 1, characterized in that: the thickness of the copper foil substrate (3) is designed to be 15 μm-100 μm. 5. The metal foil graphite thermally conductive composite material without adhesive film according to claim 1, characterized in that: the aluminum foil substrate (1) has a thermal conductivity of 230 W/M·K. 6. The metal foil-graphite thermally conductive composite material without adhesive film according to claim 1, characterized in that: the thermal conductivity of the copper foil substrate (3) is 380 W/M·K. the

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