Refractory material for casting a rare-earth alloy and its...

Details Refractory material for casting a rare-earth alloy and its... Refractory material for casting a rare-earth alloy and its...

C - Chemistry, Metallurgy

04

B

261/27, 261/38,

C04B 35/10 (2006.01) B22D 11/10 (2006.01) B22D 13/10 (2006.01) B22D 41/02 (2006.01) C04B 35/48 (2006.01)

Patent

CA 2335827

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.

Lors du coulage en feuille (6) d'un alliage des terres rares à l'aide d'un panier de coulée (3, 13), on utilise un matériau réfractaire pour ledit panier de coulée de façon à améliorer par préchauffage l'écoulement du produit fondu (2). Ce matériau réfractaire comprend sensiblement au moins 70 % de Al¿2?O¿3?, au plus 30 % de SiO¿2?, ou sensiblement au moins 70 % de ZrO¿2?, et au plus 30 % d'un ou plusieurs Y¿2?O¿3?, Ce¿2?O¿3?, CaO, MgO, Al¿2?O¿3?, TiO¿2? et SiO¿2?, et possède une densité en vrac de 1 g/cm?3¿, une conductivité thermique de 0,5 kcal/(mh ·C) au plus, dans une plage de températures comprises entre 1200 ·C et 1400 ·C ou moins et une perte de chaleur de 0,5 % en poids ou moins lorsqu'il est chauffé pendant une heure à plus 1400 ·C.

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