Device and method for preparing graphite film based on Joule heating

The invention provides a device and method for preparing a graphite film based on a Joule heating method. A reaction chamber is internally provided with positive and negative electrodes and a carrier clamping a film sample, two ends of the carrier are locked on the positive and negative electrodes, the positive and negative electrodes are connected with a pulse power supply, and the chamber is provided with a vacuum pump, an air inlet valve and an air outlet valve. Through improvement, voltage is directly applied to a conductive sample, and high-temperature heat treatment of the sample is completed; or clamping or fixing the sample on the surface of the conductive carrier, applying electricity to the conductive carrier, and indirectly heating the sample. According to the preparation method, the polyimide film is placed between the carriers, the carriers are subjected to instantaneous pre-carbonization and graphitization, the reaction time scale is the second level, the graphite film almost without defects is