SILICON NITRIDE BASED SINTERED MATERIAL AND METHOD FOR PRODUCING THE SAME, AND MOLTEN-METAL-RESISTANT MEMBER AND WEAR-RESISTANT MEMBER USING THE SAME

摘要

A silicon nitride based sintered material which comprises crystals of silicon nitride and a grain boundary layer containing at least two of a first metal silicide (a metal silicide comprising a first metal element of at least one of Fe, Cr, Mn and Cu), a second metal silicide (a metal silicide comprising a second metal element of at least one of W and Mo) and a third metal silicide (a metal silicide comprising plural metal components containing the first metal element and the second metal element, wherein the grain boundary layer has an adjacency phase in which at least two of the first to third metal silicides are adjacent to one another.