Patent ID: 10550001

Abstract:
Provided is a metallic impurity-free graphite material utilizing Joule heat generation with well-balanced resistances at room temperature and at high temperatures. The graphite material has a specific resistance at 25° C. (ρ25) of 10.0 μΩ·m or more and 12.0 μΩ·m or less; a specific resistance at 1600° C. (ρ1600) of 9.5 μΩ·m or more and 11.0 μΩ·m or less; a ratio (ρ1600/ρ25) of specific resistance at 1600° C. to that at 25° C. of 0.85 or more and 1.00 or less; a temperature at which the minimum specific resistance (ρmin) appears of 500° C. or higher and 800° C. or lower; a ratio (ρmin/ρ25) of the minimum specific resistance to the specific resistance at 25° C. of 0.70 or more and 0.80 or less; and a bulk density of 1.69 g/cm3 or more and 1.80 g/cm3 or less.