Metal-plated graphite sheet and preparation method thereof

Abstract

The invention relates to the technical field of cooling sheets, in particular to a metal-plated graphite sheet and a preparation method thereof. The preparation method comprises the following steps of1, plating a graphite sheet with chromium metal through a magnetron sputtering method, 2, plating the chromium support layer of the first graphite sheet with copper alloy on a copper alloy target material through the magnetron sputtering method; and 3, plating the copper alloy shielding layer of the second graphite sheet with nickel metal through the magnetron sputtering method to obtain the metal-plated graphite sheet. The metal-plated graphite sheet and the preparation method have the beneficial effects that in the obtained metal-plated graphite sheet, the heat conduction performance of theplating alloy metal layers is higher than the heat conduction performance of the graphite sheet in the thickness direction, and compared with the condition of no-copper plating or only-copper plating, the heat conduction performance of the graphite cooling sheet in the thickness direction is enhanced, and the electromagnetic shielding performance is also enhanced. The copper alloy shielding layeris doped with the chromium element, so that the strength and the electromagnetic shielding capability of the copper alloy are improved, the copper alloy has good electrical conductivity and thermal conductivity, and the hardness, the crack resistance and the softening temperature of the copper alloy are high.

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 ...

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

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