Although the electrode sintering process has no obvious limit, it can be divided into three stages according to the firing temperature and location. This process is carried out without external pressure and only by the weight of the paste itself.
1,Softening stage. At this time, the solid electrode paste is melted, the resistance is increased, and the strength is reduced. Finally, all the electrode paste is in a liquid state. At this stage the temperature rose from 25 ° C to 120-200 ° C, approximately 500 mm above the conductive jaw.
2,Volatilization stage. At this time, the electrode paste is fully melted, flows along the inner cross-section of the shell, fills the gaps, and makes the quality uniform. At the same time, it begins to volatilize and gradually thicken. The resistance continuously decreases, and the volatilization is sharp and paste-like. At this stage, the temperature rose from 120-200 ° C to 650-750 ° C, roughly at the half-ring position.
3,Sintering stage. At this time, a small amount of volatiles continued to volatilize and began to sinter further, and the conductivity was greatly increased to become a hard whole. The complete sintering height is 200-400 mm below the conductive jaw plate, and the temperature at this stage increases from 650-750 ° C to 900-1000 ° C.
Due to the surface oxidation of the electrode, the reaction in the furnace, and the gradual burning of the electrode during arc combustion, it is necessary to control the sintering according to its consumption and lower the sintered electrode into the furnace to maintain the proper working length and position.
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