| 摘要 |
PROBLEM TO BE SOLVED: To produce a high quality graphite sheet having high flexibility and toughness and excellent in thermal conductivity. SOLUTION: This method for producing the graphite sheet in foamed state comprises a first heat treatment step of heat treating a polyimide film as a raw material at upper limit temperature of 1,000-1,600 deg.C under an inert atmosphere and, after heat treating in the first heat treatment step, a second heat treating step of heat treating at the upper limit temperature of 2,500-3,100 deg.C under an inert atmosphere. The graphite sheet can be obtained by the process mentioned above. |
