Synergistic enhancement for room and high temperature properties of Ti(C, N)-based cermets by Re and (Cr, La)2(C, N) assistance

Abstract

Heat resistance played a crucial role in evaluating matrix material to meet the rapid development of molding industry. For the traditional Ti(C, N)-based cermets, softening and heat stocking induced degradation of mechanical properties limited its constant application under high-temperature. Herein, a novel engineering strategy for synergistically improving both room and high temperature properties was proposed by using Rhenium (Re) as additive in a (Cr, La)2(C, N) modified Ti(C, N)-based cermets. Results indicated that Re could effectively adjust the dissolution-precipitation process by dispersing into binder phase, which brought out more even microstructure and enhanced mechanical properties at both room and elevated temperatures. Benefitting from dissolution strengthening and purification effect at the interface by La, the increased thermal conductivity and thermal shocking resistance could also be obtained. With the co-enhancement of mechanical and physical properties, this new strategy could anticipate with significant potential for consideration as matrix materials in manufacturing.