| 摘要 |
PURPOSE:To control the distribution of electric resistance by applying an electric current to a carbon-ceramic composite material having the electric resistance in a specific range in an oxygen-containing atmosphere. CONSTITUTION:Si particles are dispersed in water, coated on the surface of a carbon board, dried and subsequently thermally reacted with the carbon at approximately 1800 deg.C in an inert gas to produce a carbon-ceramic composite material, such as a carbon-SiC composite material, having an electric resistance of 2mu10<-4> to 1OMEGAcm. The carbon-ceramic composite material 1 is equipped with electrodes 3,5, disposed in a heat-resistant container 7, and subsequently subjected to the application of an electric current, while introducing an oxygen- containing gas such as air from a charging port 17. The temperatures of the composite material are measured with thermometers 27, 29, 31 and 33, and the electric voltage and the electric current are controlled to approximately 5-50V and approximately 50-500A, respectively, with a thermocouple 11, a temperature controller 13 and an electric power controller 15 to control the temperature of the composite material 1. Sixtyminutes later from the starting time of the electric current application, the difference between the temperatures of the respective sites is minimized, and the whole electric resistances of the composite material are equalized. The electric resistance can continuously be inclined by adjusting the attaching positions of the electrodes. |
