| 摘要 |
PURPOSE:To increase the bulk density and anti-eduction force after the baking process and reduce electric resistance by subjecting an extrusively molded carbon rod before the regular baking process to a preliminary heat treatment for holding the rod in an air atmosphere in the specific temp. range and specific oxygen concentration range for a long period of time. CONSTITUTION:A preliminary heat treatment is conducted under the conditions that the temp. is between 100-350 deg.C, oxygen concentration between 10-21%, and the treating duration between 3-20hr. A too low temp. retards the speed of hydrogen removing reaction due to oxidation very much, while a too high temp. sinks the carbon rod residual carbon factor contrariwise or causes crazing in the rod to lead to drop of the performance against the intension. A too low oxygen concentration weakens the oxidizing power while a too high concentration worsens the economy. A too short duration results in poor progress of the hydrogen removing reaction of the binder. Thus a carbon rod is obtained, which is equipped with an increased residual carbon factor, bulk density and anti-eduction force, and also a sunk electric resistance. |
