Nozzle for continuous casting and method of producing the same

Details Nozzle for continuous casting and method of producing the same Nozzle for continuous casting and method of producing the same

B - Operations, Transporting

22

D

39/113, 22/80

B22D 41/54 (2006.01) B22D 11/10 (2006.01) C04B 35/583 (2006.01) C04B 35/66 (2006.01)

Patent

CA 2027920

A nozzle for use in continuous casting comprising an inner surface region defining the nozzle port for passing a molten steel, said inner surface region being formed from a mixture having a composition containing 50 to 80 wt% of boron nitride (BN) and 20 to 50 wt% of zirconium oxide (ZrO2), and a sintering assistant composed of silicon carbide (SiC) and boron carbide (B4C) mixed at a weight ratio of 1 : 1, the sintering assistant being added in amount of 5 to 10 wt parts to 100 wt parts of said mixture. The nozzle is produced by a process comprising the steps of: forming a uniform mixture of fine particles of boron nitride (BN), zirconium oxide (ZrO2), silicon carbide (SiC) and boron carbide (B4C); forming the mixture into a cylindrical blank;and fixing the cylindrical blank in the bore of a nozzle member by means of a joint filling material.

Cette invention concerne une busette de coulée continue comprenant une région intérieure définissant la section d'écoulement de l'acier fondu, ladite région intérieure étant formée d'un mélange renfermant en poids de 50 à 80 % de nitrure de bore (BN) et de 20 à 50 % d'oxyde de zirconium (ZrO2) et un adjuvant de frittage composé de carbure de silicium (SiC) et de carbure de bore (B4C) mélangés selon un rapport pondéral de 1 : 1 et représentant en poids entre 5-10 et 100 parties du mélange constituant la busette. Celle-ci est obtenue selon un procédé comprenant les étapes suivantes : réalisation d'un mélange homogène de fines particules de nitrure de bore (BN), d'oxyde de zirconium (ZrO2), de carbure de silicium (SiC) et de carbure de bore (B4C), agglomération du mélange pour former une ébauche cylindrique et mise en place de l'ébauche cylindrique dans l'alésage de la busette au moyen d'un produit de remplissage de joint.

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