A kind of graphite electronic heat dissipation material and its preparation method and application

Abstract

The invention relates to a graphite electronic heat radiation material as well as a preparation method and application of the graphite electronic heat radiation material. The preparation method comprises the following steps that 1) expandable graphite is sent into pulses in a high-temperature furnace and a high-frequency electric induction field to be expanded into graphite worms; 2) the graphite worms are subjected to solid-gas separation; 3) the graphite worms directly pass through carbon nanometer tubes or are added into the carbon nanometer tubes after being cooled, then, the graphite worms pass through a conveying belt, electrodes are arranged under the conveying belt, calendar rollers are arranged above the conveying belt, and the pure graphite worms subjected to primary compression or the graphite worms containing the carbon nanometer tubes are obtained; and 4) the graphite worms are pressed into flexible graphite films, plates or coiled materials in a molding pressing or multi-section rolling modes. The graphite electronic heat radiation material has the beneficial effects that 1) the expansion is very sufficient, and substances inserted into positions between layers are basically volatilized at all; 2) the energy is saved, the emission is reduced, and the fuel gas heat source realizes the carbon-free discharge; 3) the heat conductivity index of products is improved; and 4) the vertical surface heat conductivity can reach 10 to 30w / (m.l), and the parallel surface heat conductivity can reach a value higher than 300 to 900w / (m.k).

Description

technical field [0001] The invention relates to a graphite electronic heat dissipation material and a preparation method and application thereof. Background technique [0002] Natural graphite is composed of layers of carbon atoms arranged in a hexagonal arrangement or network. These hexagonally arranged carbon atoms are basically flat, oriented, and regular. Because the structure of carbon atoms in the layer is similar to that of ene, single-layer graphite is also called graphene. The layers of natural graphite are basically Parallel, equidistant, and one corner of the hexagon of the upper layer is exactly in the center of the hexagon of the next layer, and so on. Due to the typical layered structure of natural graphite, that is, the carbon atoms between the layers are bonded together by weak van der Waals bonds, while the carbon atoms in the layers are bonded together by covalent bonds, so that its layers and layers The distance between carbon atoms or layer spacing is l...

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Problems solved by technology

Due to the typical layered structure of natural graphite, that is, the carbon atoms between the layers are bonded together by weak van der Waals bonds, while the carbon atoms in the layers are bonded together by covalent bonds, so that its layers and layers The distance between carbon atoms or layer spacing is larger The distance between carbon atoms in the layer is small That is, its structural anisotropy leads to its anisotropy in thermal conductivity and electrical conductivity. The thermal conductivity in its layer is relatively high—theoretically it can reach 2100w / (m.k), while the thermal conductivity between graphite layers is lower. Low—only about 6w / (m.k); it can be seen that if the method is appropriate, pure graphite can be used to prepare flexible graphite materials with high thermal conductivity, but it will be limited by the upper limit. If the upper limit is exceeded, it is necessary to introduce heat Materials with higher conductivity than graphite

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