Process for joining silicon nitride based ceramic bodies

摘要

A method of joining silicon nitride based ceramic bodies is disclosed. At least one interfacing surface of shaped bodies (one or both of which may be hot-pressed or reaction-sintered) receives a layer of metallic aluminum based material. The bodies with the metallic aluminum based material therebetween are subjected to heating at 1400 DEG 1900 DEG C. for a period typically 0.5-2 hours in a nitriding atmosphere to effect a chemical bond consisting of a conversion of the interfacing ceramic to a Si-Al-O-N system.