| 摘要 |
A sintered ceramic dull roll for rolling mill essentially consists of 80 to 50 vol% of a first ingredient such as SiC, Si3N4, sialon, Al2O3 and ZrO2 and 20 to 50 vol% of second ingredient such as the carbides, nitrides and borides of transition elements of the groups IVa, Va and VIa of the periodic table, and has a density of not less than 96% of theoretical density, the first and second ingredients are so selected that the difference in the Young's modulus between the first and second ingredients is not more than 2 x 10<6> bar, the amount of the second ingredient is further so selected that the electric resistivity of the sintered ceramic dull roll is not more than 1 x 10<-><2> OMEGA cm and the surface of the roll has a uniform surface roughness of not less than 6 mu m, whereby the sintered ceramic dull roll has a long life. |
