BORON NITRIDE(BN) COMPOSITE MATERIAL

摘要

PURPOSE:To improve the corrosion resistance of a boron nitride (BN) composite material to molten steel without lowering the thermal shock resistance. CONSTITUTION:A silicon nitride (Si3N4)-boron nitride(BN) composite sintered material or a sialon-boron nitride(BN) composite sintered material is covered with a surface layer produced by sintering one or more substances selected from alumina(Al2O3), zirconia(ZrO2), magnesia(MgO) and spinel(MgAl2O4).