Installation notes for silicon carbon rod
◆(1) After the silicon carbon rod is heated in the air, a dense silicon oxide film is formed on the surface, which becomes an anti-oxidation protective film. In recent years, various coatings have been developed to prevent the cracking of silicon carbide rods, which are used in furnaces with various gases.
◆(2) The greater the current applied to the silicon carbide rod, the higher the surface temperature of the silicon carbide rod. It is recommended to use the smallest possible surface load density (power). Please note that the value recorded at the cold end of the silicon carbide rod is the current and voltage of 1000C in the air, which may not be consistent with the actual use. In general, the surface power of the silicon carbide rod is obtained from the relationship between the temperature in the furnace and the surface temperature of the silicon carbide rod. It is recommended to use the current and voltage of the density of the silicon carbide rod, which is inconsistent with the actual use. In general, the surface power of the silicon carbide rod is obtained from the relationship between the temperature in the furnace and the surface temperature of the silicon carbide rod. It is recommended to use the surface power (W/cm2) of 1/2-1/3 of the density of the silicon carbide rod.
(3) When the silicon carbide rod is used continuously, it is hoped to increase the resistance slowly to maintain the life.
(4) The silicon carbide rods are connected in parallel as much as possible. If the resistance values of the silicon carbide rods are different, the load of the silicon carbide rods with high resistance in series will be concentrated, resulting in a rapid increase in the resistance of a silicon carbide rod and a shortened life span of 50%.
(5) The temperature distribution characteristics of silicon carbide rods, the inspection specifications when new shipments are within △60°C within the effective heating length are considered qualified. Of course, the temperature distribution will increase with its aging, and may eventually reach 200 "C. The specific temperature distribution changes are also different due to the atmosphere in the furnace and the conditions of use.
◆(6) The service life of the silicon carbide rod is shortened with the higher the service temperature. Therefore, after the furnace temperature exceeds 1400℃, the oxidation speed will be accelerated and the service life will be shortened. During use, try not to let the surface temperature of the silicon carbide rod be too high. In the future, the oxidation speed will be accelerated and the service life will be shortened. During use, be careful not to make the surface temperature of the silicon carbide rod too high.
