| 摘要 |
PROBLEM TO BE SOLVED: To provide a graphite heater capable of directly using conventional facilities of electric source and heating furnace, useful for a heating furnace having a long life and a high specific resistance. SOLUTION: This graphite heater has >=17 μΩ.m specific resistance at a room temperature and >=12 μΩ.m specific resistance at 1,873K. The graphite heater uses an isotropic graphite having >=1.7 g/cm3 bulk density, <=1.5 μm average pore radius, <=20 ppm total ash content and 12-19 mass % oxidation consumption ratio in air at 973K for 2.5 hours. |
