BigPatents India

A method for manufacturing an immersion nozzle having a zirconia·graphite based refractory provided in the powder line portion thereof, wherein, further, at least in the portion inside the hole of the nozzle, the body of the nozzle is integrally formed with a compound comprising 10 mass % or more of a clinker which has the surface of particles containing CaO as a mineral phase and having been subjected to a hydration preventing treatment such as the formation of CaCO3 by a heat treatment in a CO2atmosphere. The method allows the inhibition of the reaction with the moisture released from a resin being added as a binder and thus the suppression of expansion of the volume of the body, which results in the prevention of occurrence of clacks in the resultant formed product during firing. (FIG. - nil)