Compaction and Structure Formation during Sintering of Composite Materials Based on Groups IV-V Transition Metal Nitrides. VI. Features of Sintering for Composite Materials of the Systems Me~(IV-V)N - Cr and Me~(IV-V)N

摘要

Features that accompany sintering of composite materials based on the systems Me~(IV-V)TV - Cr and Me~(IV-V)N - Ni in argon, nitrogen, and a vacuum are studied. It is shown that in all cases argon is the most favorable sintering atmosphere. It is established that for all materials there is typically loss of nitrogen bv nitrides that is localized in closed pores, volumetric interaction of nitride-forming metal with the metal binder, intermetallic compound formation, and a volumetric increase in binder material after sintering. Structure formation occurs under the action of two solid-phase grain growth mechanisms: coalescence and dissolution -precipitation at the refractory nitride -metal interface. Sintering process recommendations are given for composite materials based on these systems.