Preparation method of heat-conducting artificial graphite gasket
A technology of artificial graphite and graphite flakes, used in lighting and heating equipment, chemical instruments and methods, semiconductor devices, etc., can solve the problem of heat dissipation of high-power LED lamps, achieve good thermal conductivity, overcome easy drying failure, and compressibility ratio high effect
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[0021] A preparation method of thermally conductive artificial graphite gasket, which comprises the following steps:
[0022] Step 1, using biaxially stretched polyimide film as raw material, heating carbonization at 1200°C-1400°C, and ultra-high temperature graphitization at 2800°C-2900°C to obtain the first graphite material;
[0023] Step 2, the first graphite material is placed in an acid solution for treatment; then, the acid-treated graphite material is placed in a carbonization furnace under vacuum conditions and heated to 600-1000°C to obtain a second graphite material; preferably, in In step 2, the acid solution is nitric acid, perchloric acid, phosphoric acid or a mixture of at least two. More preferably, the acid solution also includes an auxiliary intercalation agent, and the auxiliary intercalation agent is potassium permanganate or hydrogen peroxide.
[0024] Step 3, compressing the second graphite material in its thickness direction, the compressed thickness is...
Embodiment 1
[0027] Cut the 50-micron thick biaxially stretched PI film (polyimide film) into 200mm*300mm size, carbonize at 1400 degrees Celsius, and then graphitize at 2900 degrees Celsius to obtain the first graphite material. The first graphite material The thickness can reach about 50 microns. The surface of the graphite material has good flatness and good appearance. It can be compressed to a maximum of 25 microns and the compression ratio is 50%;
[0028] Further, the first graphite material is put into a molar concentration ratio of [A1], sulfuric acid, hydrogen peroxide in a mixed solution of 2.5:10:2.5 to obtain an oxidized intercalated graphite material;
[0029] Further put the oxidized intercalated graphite material into the carbonization furnace, and rapidly raise the temperature to 800 degrees Celsius under the protection of nitrogen to obtain the second graphite material. The second graphite material is soft and has a thickness of up to 5 mm. The surface is uneven and has ex...
Embodiment 2
[0033] Cut the 50-micron thick biaxially stretched PI film into 300mm*300mm size, heat up carbonization at 1200 degrees Celsius, and then undergo ultra-high temperature graphitization at 2800 degrees Celsius to obtain the first graphite material. The thickness of the first graphite material can reach about 48 microns. The graphite material has good surface flatness and good appearance, and can be compressed to a maximum of 22 microns, with a compression ratio of 54%;
[0034] Further, the first graphite material is put into a mixed solution of nitric acid, sulfuric acid, and potassium permanganate with a molar concentration ratio of 5:10:0.5 to obtain an oxidized intercalated graphite material;
[0035] Further put the oxidized intercalated graphite material into the carbonization furnace, and rapidly raise the temperature to 500 degrees Celsius under the protection of nitrogen to obtain the second graphite material. The modified second graphite material is soft and the thickne...
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