Method for preparing high thermal conductivity graphite through catalytic graphitization
A high thermal conductivity graphite and graphitization technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problem of inability to fundamentally suppress catalyst overflow, increase the difficulty of PI film preparation, and fail to achieve catalytic graphitization, etc. problem, to achieve the effect of good anti-twisting performance, improved mechanical strength, and improved effect
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Embodiment 1
[0034] A method for preparing high thermal conductivity graphite by catalytic graphitization of the present invention comprises the following steps:
[0035] (1) Carbonization treatment: stack the polyimide film and graphite paper of the required size cross-stacked and place them in the carbonization furnace; first vacuum the carbonization furnace to within 20Pa, then start the heating power supply at a heating rate of 10°C / min Raise the carbonization furnace from room temperature to 500 °C; then raise the temperature to 600 °C at a rate of 2 °C / min, and keep it for 30 min; then increase the rate of temperature to 800 °C at a rate of 2 °C / min; Raise the heating rate to 1000°C and hold it for 1 hour to obtain a carbon film material with an amorphous carbon structure;
[0036] (2) Loading catalyst: use nickel nitrate, iron sulfate and copper nitrate as solutes, deionized water as solvent, and configure a 0.2mol / L metal salt solution, in which the molar ratio of nickel ions, iron...
Embodiment 2
[0040] A method for preparing high thermal conductivity graphite by catalytic graphitization of the present invention comprises the following steps:
[0041] (1) Carbonization treatment: Stack the polyimide film and graphite paper of the required size crosswise and place them in the carbonization furnace; first vacuum the carbonization furnace to within 20Pa, then start the heating power supply at a heating rate of 15°C / min The carbonization furnace was raised from room temperature to 500°C; then raised to 600°C at a rate of 5°C / min, and held for 60 minutes; then raised to 800°C at a rate of 5°C / min; finally, at a rate of 15°C / min Raise the heating rate to 1300°C and hold for 2 hours to obtain a carbon film material with an amorphous carbon structure;
[0042] (2) Loading catalyst: use nickel nitrate as the solute, deionized water as the solvent, and configure a 0.15mol / L nickel nitrate solution as the electrolyte; use the carbon film material as the cathode, and the electroly...
Embodiment 3
[0046] A method for preparing high thermal conductivity graphite by catalytic graphitization of the present invention comprises the following steps:
[0047] (1) Carbonization treatment: Stack the polyimide film and graphite paper of the required size crosswise and place them in the carbonization furnace; first vacuum the carbonization furnace to within 20Pa, then start the heating power supply at a heating rate of 15°C / min The carbonization furnace was raised from room temperature to 500°C; then raised to 600°C at a rate of 1°C / min, and held for 30 minutes; then raised to 800°C at a rate of 1°C / min; finally, at a rate of 15°C / min Raise the heating rate to 1300°C and hold for 2 hours to obtain a carbon film material with an amorphous carbon structure;
[0048] (2) Loading catalyst: First, soak the carbon film in concentrated nitric acid with a temperature of 80°C and a mass fraction of 65% for 2 hours, take it out and clean it, and complete the roughening treatment; Soak in a...
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