| 摘要 |
PURPOSE:To improve the surface smoothness of glass like carbon sheet by putting and pressing an aromatic polyimide film between carbonaceous pressing plates and burning the film in a state applying pressing pressure in non-oxidizing atmosphere. CONSTITUTION:A polyimide film having 25mum-2.5mm thickness and molecular structural formula expressed by formula I or formula II is put and pressed between pressing plates formed of graphite polished fo <=65mum Rmax surface roughness and having <=100mum maximum granule size and >=1.75g/cm<2> bulk density. Then the film is burned at 80-2100 deg.C in a state applying at least 20gf/cm<2> pressing pressure under non-oxidizing atmosphere such as N2 gas to provide the glass like carbon sheet having good-precise surface smoothness and uniform dense structure. |
