| 摘要 |
PROBLEM TO BE SOLVED: To obtain a vitreous carbon material having a uniform structure in the cross section in the thickness direction and having excellent shock resistance by forming such a structure that the difference of the average lattice distance of graphite hexagonal mesh layers between in the surface layer part and in the center part of the cross section to a specified range. SOLUTION: This impact resistant vitreous carbon is produced to satisfy such requirement that the difference of the average lattice distance d002 , in the graphite hexagonal mash layers is within 0.01nm between in the surface layer part and in the center part in the cross section or that the difference of the grain size Lc (002) is within 1.5nm in the surface layer part and in the center part of the cross section. The obtd. material shows a uniform structure for both of the inner and outer layers in the cross section and has little inner stress or residual stress, so that stress fracture due to an external impact can effectively be reduced. Further, by controlling the average lattice distance of the graphite hexagonal mesh layers in the cross section to 0.345-0.365nm and controlling the grain size in the center part to 1.3-4.0nm, the shock resistance is further improved. |
