After the first use and normal use of the crucible

After the first use and normal use of the crucible

(1) Stove loading.

(2) Slowly heat to 600 ℃ with low power. When the crucible is not used for a long time, it should be preheated according to the heating speed requirement of 2 hours to 200 ℃ and follow the relevant operating rules.

(3) Heat the crucible to the specified temperature with full power, and the heating program depends on the frequency of furnace use, coil size, and the electrical resistivity of the melted metal. The design of the furnace and the material of the crucible determine whether the empty crucible can be preheated. If conditions permit, it would be better to heat the crucible in advance. Silicon carbide graphite crucibles are more susceptible to thermal shock and must be slowly heated. Note: For a tilting furnace, the furnace top cover must be air dried using an electric induction or flame heater before starting to use the crucible.

For furnaces with frequencies above 1kHz:

(1) Suggest preheating the empty crucible. Heat the crucible at 20% of its maximum power until it turns red hot.

(2) After 30 minutes, the heating power can be adjusted to 50% of the maximum power.

(3) Maintain 50% of the maximum power and add metal blocks until the metal liquid fills half of the crucible volume.

(4) Increase power. Be careful not to overheat the crucible. When the metal melts and fills the crucible, reduce the electrical power to avoid crucible corrosion.

For furnaces with frequencies below 1kHz:

(1) The heating efficiency of an empty crucible is relatively low, so it is necessary to place some metal blocks in the preheating crucible to improve the preheating effect.

(2) Heat the crucible at 20% of the maximum power until it turns red hot.

(3) If the crucible turns red hot within half an hour, please heat the crucible at 50% of its maximum power.

(4) Keep heating at 50% of the maximum power until the metal liquid fills half of the crucible volume before starting to increase the heating power

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