The reaction sintering die silicon nitride join quality sintering body and its production manner null which are superior in resistance metal hot water cast equipped

摘要

PURPOSE:To obtain a sintered material bonded with silicon nitride having excellent resistance to welding of metallic melt in a low cost by forming a surface layer comprising BN, AlN or a mixture of the both together with a matrix in one body in applying a silicon nitride obtained from a reaction-sintering to a face of a sintering matrix bonded with the silicon nitride of reaction- sintering type to be brought into contact with a melt as binder. CONSTITUTION:A coating agent in which BN, AlN or a mixture of the both is dispersed in a mixing weight ratio to Si of (95:5) to (1:99) is applied onto a face of a pre-molded material of metallic silicon to be brought into contact with a melt and a resultant material is subjected to a reaction-sintering at 1100-1800 deg.C in N2 gas atmosphere to afford the objective sintered material bonded with a silicon nitride of reaction-sintering type having excellent resistance to welding of metallic melt.