The higher the current is, the higher the surface temperature is. It is suggested to use a minimum surface load density. Please pay attention to the value recorded at the cold end of the graphite rod, which is the current and voltage of 1000 ℃ in the air. It is consistent with practice. In general. The external power of the graphite rod is obtained from the relationship between the temperature inside the furnace and the external temperature of the graphite rod. It is recommended to use the external power of one-half to one-third of the limit density of the graphite rod.

If the resistance of the graphite rod is high, the load of the graphite rod with high resistance will be concentrated in series, which will shorten the life of a certain graphite rod.

After the graphite rod is heated in the air, a dense silicon oxide film is formed on the surface, and an anti-oxidation maintenance film is made, which has the effect of prolonging the service life. In recent years, various kinds of coatings have been developed to avoid the cracking of graphite rods and used in furnaces containing various gases.

After the graphite rod is heated in the air, a dense silicon oxide film is formed on the surface, and an anti-oxidation maintenance film is made, which has the effect of prolonging the service life. In recent years, various kinds of coatings have been developed to avoid the cracking of graphite rods and used in furnaces containing various gases.