Stopper rod with an outer layer for forming a gas-tight layer

Details Stopper rod with an outer layer for forming a gas-tight layer Stopper rod with an outer layer for forming a gas-tight layer

B - Operations, Transporting

22

D

B22D 41/18 (2006.01)

Patent

CA 2206792

A steel casting stopper rod comprising a body (2) with a tip (5) made of a carbon-containing refractory material. The tip (5) is at least partially coated with an outer layer (4) capable of forming a gas-tight, oxidised, densified sintered layer at temperatures higher than 1000 ~C. The layer (4) preferably consists of a refractory material comprising sintering precursors such as calcined alumina, reactive calcined alumina, silica fumes or clays.

Quenouille pour la coulée d'acier. Elle comporte un corps (2) terminé par un nez (5) réalisé en un matériau réfractaire comportant du carbone. Une couche externe (4) revêt partiellement ou entièrement le nez (5). Cette couche (4) est apte à former une couche frittée dense oxydée et imperméable aux gaz lorsqu'elle est portée à une température supérieure à 1000 ~C. La couche (4) est, de préférence, constituée d'un matériau réfractaire comportant des précurseurs de frittage, tels que l'alumine calcinée, l'alumine calcinée réactive, la fumée de silice, les argiles.

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