Preparation method for three-dimensional highly-heat-conductive carbon material
A carbon material, high thermal conductivity technology, applied in the field of high thermal conductivity carbon material, three-dimensional high thermal conductivity carbon material preparation, can solve the problem of thermal conductivity anisotropy limitation, etc., to achieve low thermal conductivity anisotropy rate, high thermal conductivity characteristics , the effect of high thermal conductivity
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[0028] The three-dimensional high thermal conductivity material prepared by the preparation method of the three-dimensional high thermal conductivity material of the present invention uses the carbonized semi-finished product that can form a high thermal conductivity skeleton carbon material as the skeleton, and forms a fillable skeleton through opening treatment. Using a high thermal conductivity reinforcement with a particle size smaller than the pore size as a filler, the liquid phase carrier is used to repeatedly fill the high thermal conductivity reinforcement into the skeleton material after opening the pores to form a filled carbon skeleton material. The obtained filled carbon framework material is embedded with pitch and densified under high temperature and high pressure conditions, and then the densified filled carbon framework material is subjected to high temperature heat treatment. After repeated densification and high temperature heat treatment, a three-dimensional ...
Embodiment 1
[0037] 1) The mesophase pitch (softening point 290°C) was foamed at 500°C and 5 MPa for 4 hours to form a skeleton carbon material raw meal, which was then carbonized at 900°C to obtain a carbon skeleton material. The carbon skeleton material is placed in a mixed solution of nitric acid and sulfuric acid for ultrasonic vibration to open pores, cleaned with deionized water and then dried to obtain a fillable carbon framework material with a high porosity rate, and the open pore size is in the range of 50-300 μm .
[0038] 2) Using 40 μm flake graphite as a high thermal conductivity enhancer, using phenolic resin as a liquid phase carrier, filling the flake graphite into the pores of the carbon skeleton material through a combination of vacuum impregnation and pressure impregnation, and removing excess resin on the surface Carry out curing treatment. Carry out carbonization treatment at 900°C after repeated impregnation and curing treatment once, to obtain filled carbon skeleto...
Embodiment 2
[0042] 1) The mesophase pitch (softening point 320°C) was foamed at 550°C and 3 MPa for 3 hours to form a skeleton carbon material raw meal, which was then carbonized at 900°C to obtain a carbon skeleton material. The carbon skeleton material is placed in a muffle furnace for opening treatment in an aerobic environment at 400°C, cleaned with deionized water and ultrasonically oscillated, and then dried to obtain a fillable carbon skeleton material with a high porosity rate. The pore size of the open pores is 40 ~ 400μm range.
[0043] 2) Crush chopped high thermal conductivity carbon fiber (thermal conductivity about 600W / (m.K)) to obtain high thermal conductivity carbon fiber powder with a length of less than 40μm, mix it with medium temperature pitch powder, and pass vacuum impregnation-pressure in a hot melt state The combination of impregnation is used to fill the pores of the carbon skeleton material, and after removing the excess pitch on the surface, carbonization treat...
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