Refractory material for casting a rare-earth alloy and its production method as well as method for casting the rare-earth alloys

Abstract From the Canadian patent

In casting a rare earth alloy into a sheet (6) using a tundish (3 13), as a , refractory for a tundish which can be used for dispensing with a preheating step for the purpose of improving the flow of a melt (2) use is made of a , refractory which consists substantially of 70 wt.% or more of Al2O3 and 30 % or less of SiO2 or consists substantially of 70 wt.% or more of ZrO2 and 30 % or less of one or more of Y2O3, Ce2O3, CaO MgO, Al2O3, TiO2 and SiO2, and has , a bulk density of 1 g/cm3 a thermal conductivity in a temperature range of 1200 to 1400 ~C of 0.5 kcal/(mh ~C) or less and a heat loss under a heating , condition of one hour at 1400 ~C of 0.5 wt.% or less.