| 摘要 |
PURPOSE:To obtain a refractory having satisfactory heat resistance, thermal impact resistance, wear resistance, etc., and useful for continuous casting installations by employing a sintered product comprising silicon nitride as a matrix, boron nitride, the boride or nitride of an element of the group IV A and a sintering auxiliary in a specific ratio. CONSTITUTION:A refractory is formed from 3-15wt.% of boron nitride, 2-20wt.% of at least one of the borides or nitrides of titanium, zirconium and hafnium, 5-20wt.% of a sintering auxiliary and the remaining amount of the inevitable impurities of the silicon nitride. At least one of the oxides of MgO, Al2O3, Al2O3.MgO, Y2O3, ZrO2, etc., may be used as the sintering auxiliary. |
