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碳素电极通常是用煅燒石油焦、无烟煤等,按一定的粒度組成,同煤焦油或煤瀝青等粘粘剂混捏,再用挤压机或模压机压制而成的。然后在足够的高溫下焙燒,以驅除粘結剂中的揮发分。这样,电极要减重8％～16％左右,碳素体內会形成空隙(孔隙度介于15％～30％之間)。本发明为减少电极体內的孔隙度,并大大提高其导电及机械性能,用含有碳化氫的气体在足够高的溫度下通过碳素体,使碳化氫分解而殘留在碳素体內以充填孔隙。
Carbon electrodes are usually calcined petroleum coke, anthracite, etc., according to a certain particle size, with coal tar or coal tar pitch and other adhesives kneading, and then pressed or molded press. It is then fired at a sufficiently high temperature to repel the volatiles in the binder. In this way, the electrode to weight loss of about 8% to 16%, the carbon body will form voids (porosity between 15% and 30%). In order to reduce the porosity in the electrode body and greatly improve its electrical and mechanical properties, the present invention uses a gas containing hydrogen carbide to pass through a carbon body at a sufficiently high temperature to decompose the hydrocarbon and leave it in the carbon body to fill Pores.