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A kind of metal-coated graphite sheet and preparation method thereof

A graphite sheet, metal plating technology, applied in metal material coating process, sputtering coating, vacuum evaporation coating and other directions, can solve the problems of affecting the heat dissipation effect, easy to be oxidized, affecting the shielding effect, etc., to enhance thermal conductivity and electromagnetic shielding performance, no deformation and cracking, and the effect of reducing production costs

Active Publication Date: 2022-04-22
SHENZHEN HANKE NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages: Because there is a layer of adhesive between the graphite sheet and the copper foil, this layer of adhesive has poor thermal conductivity, which is equivalent to a layer of heat insulation layer, so that the heat on the graphite sheet is difficult to transfer to the copper foil, which affects the heat dissipation effect
Due to the thin metal coating, the metal shielding effect is affected, and the shielding effectiveness is only about 70dB, which cannot meet the higher shielding requirements
②The metal of the metal shielding layer is more active and easily oxidized, which affects the shielding effect
③Regardless of vacuum evaporation or magnetron sputtering method of coating, no matter which method is used to vaporize the metal target metal, high temperature will be generated. At too high temperature, the PET film (plastic film) supporting the graphite sheet will soften, so that it cannot be rolled into batches Production
[0006] Further, the existing heat dissipation structure of graphite sheets on the motherboard of mobile phones is not conducive to the thin design of mobile phones

Method used

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  • A kind of metal-coated graphite sheet and preparation method thereof

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preparation example Construction

[0017] The invention provides a kind of preparation method of metal-coated graphite sheet, comprises the steps:

[0018] Step 1, plating chromium metal on the graphite sheet by magnetron sputtering to obtain the first graphite sheet with a chromium support layer;

[0019] Step 2, plating the copper alloy on the copper alloy target onto the chromium support layer of the first graphite sheet by magnetron sputtering to obtain a second graphite sheet with a copper alloy shielding layer;

[0020] The weight percent composition of the copper alloy target material is: Cr 0.1-0.5%, Al 1-3%, and the rest is Cu;

[0021] Step 3. Plating nickel metal on the copper alloy shielding layer of the second graphite sheet by magnetron sputtering to obtain a metal-coated graphite sheet.

[0022] The metal-plated graphite sheet of the present invention is provided with three coatings with different functions, including chromium support layer, copper alloy shielding layer and nickel metal layer su...

Embodiment 1

[0032] A preparation method of metal-coated graphite sheet, comprising the steps of:

[0033] Step 1, plating chromium metal on the graphite sheet by magnetron sputtering to obtain the first graphite sheet with a chromium support layer;

[0034] Step 2, plating the copper alloy on the copper alloy target onto the chromium support layer of the first graphite sheet by magnetron sputtering to obtain a second graphite sheet with a copper alloy shielding layer;

[0035] The preparation method of the copper alloy target material is as follows: preparing Cr, Al and Cu raw materials, and then using induction melting method to conduct melting and alloying at a temperature of 1100-1200° C. in a vacuum atmosphere, and then, the alloyed The melt is cast into a mold to obtain a copper alloy target.

[0036] The weight percent composition of the copper alloy target material is: Cr 0.1%, Al 1%, and the rest is Cu;

[0037] Step 3, plating nickel metal on the copper alloy shielding layer of...

Embodiment 2

[0040] A preparation method of metal-coated graphite sheet, comprising the steps of:

[0041] Step 1, plating chromium metal on the graphite sheet by magnetron sputtering to obtain the first graphite sheet with a chromium support layer;

[0042] Step 2, plating the copper alloy on the copper alloy target onto the chromium support layer of the first graphite sheet by magnetron sputtering to obtain a second graphite sheet with a copper alloy shielding layer;

[0043] The preparation method of the copper alloy target material is as follows: preparing Cr, Al and Cu raw materials, and then using induction melting method to conduct melting and alloying at a temperature of 1100-1200° C. in a vacuum atmosphere, and then, the alloyed The melt is cast into a mold to obtain a copper alloy target.

[0044] The weight percent composition of the copper alloy target material is: Cr 0.3%, Al 2%, and the rest is Cu;

[0045] Step 3. Plating nickel metal on the copper alloy shielding layer of...

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Abstract

The invention relates to the technical field of heat sinks, in particular to a metal-coated graphite sheet and a preparation method thereof. The preparation method comprises the following steps: plating chromium metal on the graphite sheet by magnetron sputtering; step 2, coating a copper alloy target The copper alloy on the material is plated on the chromium support layer of the first graphite sheet by the magnetron sputtering method; Step 3, the nickel metal is plated on the copper alloy shielding layer of the second graphite sheet by the magnetron sputtering method, Metallized graphite flakes are obtained. The beneficial effects of the present invention are: in the obtained metal-coated graphite sheet, the thermal conductivity of the plated alloy metal layer is stronger than that in the thickness direction of the graphite sheet, and compared with no copper plating or simple copper plating, it not only enhances the thermal conductivity of the graphite heat sink in the thickness direction Thermal conductivity in turn enhances electromagnetic shielding performance. Doping chromium in the copper alloy shielding layer improves the strength and electromagnetic shielding ability of the copper alloy, making it have good electrical and thermal conductivity, and making it have high hardness, crack resistance and softening temperature.

Description

technical field [0001] The invention relates to the technical field of heat sinks, in particular to a metal-coated graphite sheet and a preparation method thereof. Background technique [0002] As electronic products such as mobile phones gradually turn to the development trend of thinner and lighter, the power consumption of chips is increasing, and the heat dissipation problem of electronic products is becoming more and more prominent. In order to improve the heat dissipation of electronic products, graphite sheets are widely used in the design of electronic products. [0003] Graphite sheet is a kind of heat sink with very efficient heat conduction ability in the plane direction. When one end of the graphite sheet touches the heat source, the heat can be quickly and evenly transferred to the entire graphite sheet. However, the heat conduction and heat dissipation capabilities of the graphite sheet in the thickness direction are poor, and the heat cannot be dissipated in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/35C23C14/18C22C9/01H05K7/20
CPCC23C14/35C23C14/185C23C14/3407C22C9/01H05K7/2039
Inventor 刘稳王荣福
Owner SHENZHEN HANKE NEW MATERIAL TECH CO LTD
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