| 简介 |
Rare-earth alloy is cast into a sheet (6) or the like by using a tundish (3, 13). The refractory material of the tundish used for casting does not necessitate preheating for improving the flowability of the melt (2). The refractory material used essentially consists of 70 wt% or more of Al2O3 and 30 wt% or less of SiO2, or 70 wt% or more of ZrO2 and 30 wt% or less of one or more of Y2O3, Ce2O3, CaO, MgO, Al2O3, TiO2 and SiO2. The refractory material has 1g/cm3 or less of bulk density, has 0.5 kcal/(mh°C) or less of thermal conductivity in the temperature range of from 1200 to 1400°C, and has 0.5 wt% or less of ratio of ignition weight-loss under the heating condition of 1400°C for 1 hour. |
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