To ensure high vacuum, besides reliable air tightness of furnace and vacuum pipeline, appropriate vacuum pump equipment is also required.
The requirement of vacuum pump is put forward according to the condition of reducing period. After the pressure block is installed in the furnace and the furnace is closed, the air in the furnace must be drawn out. Then, with the heating of the charge, the inhaled and combined gases (water vapor and carbon dioxide) are separated from the briquette. When these gases are separated out at high temperature, even in a small amount, the furnace pressure can be greatly increased and the vacuum process can be destroyed. In addition, when carbon dioxide and water vapor enter the hot area, gram and silicon and the separated water vapor will react. Therefore, it is necessary to ensure the rapid and sufficient extraction of the separated gas.
Therefore, the vacuum pump should complete the following tasks: first, it should ensure the extraction of a large number of gases under normal pressure at the beginning of the cycle; second, it should maintain a considerable gas extraction speed under low pressure throughout the operation cycle.
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