Patent ID: 8172114
Filing Date: 2012-05-08
Classification: B22D,C03C,C04B

Abstract:
1. A continuous casting nozzle comprising a tubular refractory structure which has an inner bore formed along an axial direction thereof to allow molten metal to pass therethrough, and includes an inner bore-side layer disposed to define the inner bore and an outer periphery-side layer disposed radially outward of the inner bore-side layer, wherein, in a part or entirety of the tubular refractory structure, a refractory material of the inner bore-side layer has a thermal expansion greater than that of a refractory material of the outer periphery-side layer, the continuous casting nozzle being characterized in that the inner bore-side layer and the outer periphery-side layer are mutually independent shaped bodies, wherein a first one of the shaped bodies serving as the inner bore-side layer is fixed to the other, second, shaped body serving as the outer periphery-side layer through an intermediate layer having compressibility, and wherein: a bonding strength between the intermediate layer and each of the first shaped body serving as the inner bore-side layer and the second shaped body serving as the outer periphery-side layer is in the range of 0.01 to 1.5 MPa, as measured under a hot condition in a non-oxidation atmosphere at a temperature of 1000 to 1500° C.; and the intermediate layer has a compressive rate K (%) satisfying the following Formula 1, wherein: wherein the intermediate layer includes an intermediate refractory material which contains a hollow refractory aggregate in an amount of 10 to 75 volume %, wherein a ratio of an average radius R of each particle of the aggregate to an average wall thickness t of the particle satisfies the following relation: R/t≧10.