Patent ID: 9004150
Filing Date: 2015-04-14
Classification: B22D

Abstract:
1. Method for a continuous casting of molten metal in the form of a hollow jet in a nozzle positioned between a ladle or a tundish and a continuous casting ingot mould, said nozzle comprising in its upper part a distribution device capable of diverting at least part of the molten metal arriving at the inlet of the nozzle towards an inner wall of the nozzle before it enters the ingot mould, said method comprises the injection into an internal volume of the hollow jet of finely divided solid material comprising nanoparticles of technical ceramic with a characteristic size lower than 200 nm, said nanoparticles being conglomerated prior to their injection into the nozzle into solid pellets of a size between 10 and 1,000 microns, characterised in that said solid pellets comprise the nanoparticles and a metal matrix, wherein said pellets have a sufficient cohesion to avoid their dissociation during the injection, wherein said nanoparticles are oxide nanoparticles selected from the group consisting of Al 2 O 3 , TiO 2 , SiO 2 , MgO, ZrO 2 and Y 2 O 3 , and wherein the nanoparticles are incorporated in a quantity between 0.1 and 1% by weight of the casted molten metal.