Graphite sheet and metal layer composed thermally conductive sheet and its composing method

Abstract

The invention provides a graphite sheet and metal layer composed thermally conductive sheet and its composing method. According to one embodiment of the invention, through a PVD aluminum deposition layer, the composition of a graphite sheet and other metal layers becomes possible so as to solve the difficulty with increasing the thickness of graphite sheet and thermally-conductive sheet and the problem of low thermal conductivity in the thickness direction. Based on these ideas, the invention aims to improve the overall heat capacity of the thermally conductive sheet and the comprehensive thermal conductivity in the thickness direction. The thermally conductive sheet of the invention can replace the product structure characterized by the adhesion of adhesive layers among multiple graphite sheet layers or between a graphite sheet and metal. Based on the prior art, the present invention combines the PVD aluminum plating technique and the metal hot-press diffusion method. Compared with the pure use of CVD or liquid plating method, the method of the invention is more efficient to obtain a composite metal layer with the same thickness. In addition, the once hard-to-obtain composite thickness and composite structure in the prior art can be more likely to be achieved. The composing method resolves the problem of how to accumulate composite metal layers with designated thicknesses and avoids the inherent defects of CVD and the liquid plating method.

Description

Technical field [0001] The invention relates to the field of thermal conductive materials composed of graphite sheets, belonging to a layered body, suitable for heat conduction and heat dissipation applications of electronic components, and in particular to a thermal conductive sheet composited by graphite sheets and metal layers and a composite method thereof. Background technique [0002] As the thermal conductivity of synthetic graphite flakes is much higher than that of natural graphite flakes, they are widely used in the electronics industry. However, the thermal conductivity of the synthetic graphite sheet in the longitudinal direction (thickness direction) is low, which restricts the improvement of the heat conduction effect, which has always been a problem that the industry expects to solve. In order to improve the thermal conductivity, in addition to increasing the longitudinal thermal conductivity, there is a more feasible way to increase the thickness of the graphite s...

AI Technical Summary

Problems solved by technology

The commonly used method in the industry to increase the thickness of graphite sheets is to glue multiple layers of graphite sheets together. This method is still not ideal for improving thermal conductivity.

It was also proposed to improve the longitudinal thermal conductivity by combining graphite flakes with metal, and a method for preparing metal coatings and graphite composites in the plating solution was proposed, and it was also proposed to combine graphite flakes with graphite by CVD (chemical vapor deposition) technology. Metal composite methods, however, these methods have inherent defects such as low production efficiency and the metal layer cannot be thicker, and it is difficult to control the thickness of the metal layer. The effect of improving the longitudinal thermal conductivity is still not ideal.

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