Method of preparing high-strength heat conducting graphite flakes with flow guiding and heat conducting functions

Abstract

The invention discloses a method of preparing high-strength heat conducting graphite flakes with flow guiding and heat conducting functions. The method includes the steps of raw material preparing, pre-crushing, pre-screening, deironing, secondary crushing, secondary screening, mixing, profiling and heating, graphitizing at high temperature, back film preparing, heat conducting tank pressing and cutting. The machining process is scientific and reasonable in step, the machining process in the prior art is improved, the raw material is processed in a refined mode, the granularity of the graphite flakes is more uniform, the qualification rate of the finished product is increased, and electrical conductivity and heat conductivity of the heat conducting graphite flakes are improved; by means of the process, the chemical stability of the graphite flakes can be improved, thermal expansion is reduced, and the graphite flakes are easy to machine and shape.

Description

technical field [0001] The invention relates to a heat-conducting graphite sheet used in the field of electronic products, in particular to a method for preparing a high-strength heat-conducting and current-conducting heat-conducting graphite sheet. Background technique [0002] Thermally conductive graphite sheet is a brand-new heat-conducting and heat-dissipating material. It conducts heat evenly along two sides, shields heat sources and components, and improves the performance of consumer electronics products. The color is generally black, and the material is finely processed natural graphite. The thermal conductivity is in the horizontal direction. Up to 1500W / M-K, using IC, CPU, MOS, LED, heat sink, LCD-TV, notebook computer, communication equipment, wireless switch, DVD, handheld device, etc. [0003] Thermally conductive graphite sheets are non-metallic materials, but have the same or even higher thermal conductivity and electrical conductivity than metals, and thei...

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Problems solved by technology

[0003] Thermally conductive graphite sheets are non-metallic materials, but have the same or even higher thermal conductivity and electrical conductivity than metals, and their thermal conductivity and electrical conductivity are stronger than aluminum foil or copper foil, but thermally conductive graphite sheets are produced in the existing production process. The electrical conductivity and thermal conductivity are relatively optimal, mainly in the processing stage of raw materials. In the prior art, the processing of raw materials for thermally conductive graphite sheets is not refined enough, resulting in more impurities in the raw materials, so that the final produced thermally conductive graphite sheets The quality is not high enough, the pass rate is reduced, and it will affect its better arrival and thermal conductivity

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