| 摘要 |
A sliding closure unit for selectively discharging liquid melt from a liquid melt container includes a stationary refractory plate and a sliding refractory plate, the two refractory plates having complementary, abutting relative sliding surfaces. The stationary refractory plate consists essentially of a substantially non-wettable material having a Mohs' hardness of from 1 to 2, a thermal conductivity of greater than 40 W/km at 700 DEG C. and a crushing strength of not greater than 25 N/mm2 at about room temperature. The sliding refractory plate consists essentially of a substantially non-porous material having a Mohs' hardness of from 6 to 7, a thermal conductivity of less than 3 W/km at 700 DEG C. and a crushing strength of greater than 300 N/mm2 at approximately room temperature.
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