| 摘要 |
PURPOSE:To obtain a furnace floor having low electric reistance by using scaly graphite powdered materials or graphitized carbon fiber felt or a mixture of the both as joint materials for a joint between a metal plate and a permanent brick and for a joint between the permanent brick and a wear brick. CONSTITUTION:A furnace floor of a DC electric furnace is constructed with an electrode plate made of a metal (mainly, copper plate) forming a furnace bottom, electrically conductive bricks (mainly, burned MgO-C bricks) with which the electrode plate is lined and which are usually stacked in two stages on the upper part of the electrode plate, and a stamp material constituting the furnace floor. An electric current is caused to flow through these layers. In this case, for a joint between the metal plate that is the electrode and a permanent brick and for a joint between the permanent brick and a wear brick, a scaly graphite powdered material having a mean particle size of 0.12 to 0.5mm or graphitized carbon fiber felt is used as a joint material. Further, the burned MgO-C bricks containing 8 to 25wt.% of graphite are used as the permanent and wear bricks. |
