摘要:
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 1 g/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.
摘要翻译:通过使用中间包(3,13)将稀土合金铸造成板(6)等。 用于铸造的中间包的耐火材料不需要预热以改善熔体(2)的流动性。 使用的耐火材料基本上由70重量%以上的Al 2 O 3 3和30重量%以下的SiO 2或70 重量%以上的ZrO 2 2和30重量%以下的Y 2 O 3,Ce 2, CaO,MgO,Al 2 O 3,TiO 2和SiO 2, 2 SUB>。 耐火材料具有1g / cm 3或更小的堆积密度,在1200至1400℃的温度范围内具有0.5kcal /(mh℃)或更低的热导率, 并且在1400℃的加热条件下具有0.5重量%以下的点火失重比率1小时。