Patent ID: 6513573
Filing Date: 2003-02-04
Classification: B22D

Abstract:
A refractory plate member (8) for side containment in continuous casting machines having two counterrotating rolls (1, 2) sliding onto a surface of said plate member (8), said plate member (8) including two or more overlapped ceramic and refractory layers (9,91,10,101), wherein the first layer (9,91) of said plate member (8) contacts the rolls (1,2) and is made of a material easily wearable when sliding onto said rolls, and the second layer (10,101) underlying said first layer (9,91) is made of a material having a very high wear and thermal shock resistance, the plate member (8) being characterized in that:said first layer is made of a material (9) including from 20 to 30% BN by weight with respect to the total weight, the remaining materials in the total weight comprising one or more component materials chosen from the group consisting of Al2O3, SiO2, SiC, ZrO2, and SiAlON; and said second layer comprises a graphitic carbon material (10) obtained through a hot pressing process starting from a carbon matrix, with a grain size ranging from 30 to 250 &mgr;m, wherein graphite flakes having a size from 50 to 125 &mgr;m and a final porosity from 6 to 15% are incorporated.