Determination of Oxidation Rate of Graphite Electrode
The oxidation rate of graphite electrode is an important physical property for graphite materials. Graphite electrodes are widely used in electric furnace smelting, silicon carbide production and non-ferrous metal smelting. Therefore, the accurate determination of the oxidation rate of the graphite electrode is very different in the selection and design of the graphite electrode equipment.
At present, the main methods for determining the oxidation rate of graphite electrode are arc resistance method, linear expansion coefficient method, differential thermal analysis method, electrical thermal analysis method, manganese dioxide method and so on.
Arc resistance method is the method for measuring the oxidation rate of graphite electrode by measuring the maximum current corresponding to a certain arc resistance between the electrodes. This method is simple in operation and can reflect the oxidation rate of the electrode in use, but it cannot accurately reflect the entire oxidation process of the graphite electrode.
The linear expansion coefficient method is a method for determining the oxidation rate of graphite electrode by measuring the linear expansion coefficient of the graphite at high temperatures. This method is difficult to operate, but it can accurately reflect the oxidation rate of the graphite electrode.
Differential thermal analysis method is a method for determining the oxidation rate of graphite electrode by measuring the amount of graphite lost in a certain temperature range. This method can accurately reflect the oxidation rate of the graphite electrode, but the operation is relatively complicated.
Electrical thermal analysis method is a method for determining the oxidation rate of graphite electrode by measuring the oxidation rate of the graphite electrode in the temperature range from room temperature to 1050 °C. This method can accurately reflect the oxidation rate of the graphite electrode, and it is more convenient for users to operate.
Manganese dioxide method is a method for determining the oxidation rate of graphite electrode by calculating the amount of manganese dioxide produced by the oxidation reaction of graphite in the temperature range from room temperature to 800 °C . The operation is simple and it can accurately reflect the oxidation rate of the graphite electrode.
In conclusion, the determination of the oxidation rate of graphite electrode is important to graphite materials. At present, the main methods for determining the oxidation rate of graphite electrode are arc resistance method, linear expansion coefficient method, differential thermal analysis method, electrical thermal analysis method, and manganese dioxide method. Among them, electrical thermal analysis method and manganese dioxide method are relatively simple and reliable in operation, and can accurately reflect the oxidation rate of the graphite electrode.
