(08)Influence of Stoichiometry and Processing on the Tribological Profile of Hardmetals Based on Niobium Carbide (NbC)

摘要

The tribological behavior under dry sliding of a Fe_3Al-NbC composite prepared by pyro-metal-lurgical synthesis is compared to different SPS sintered NbC-based hardmetals bonded by cobalt or Fe_3Al. The dry sliding wear resistance (0.1-7/10 m/s) of the present Fe_3Al-NbC with -60% NbC was close to those known of NbC-based hard metals. No grain pull-outs or fragmentations of the NbC grains were seen in the wear tracks of the Fe_3Al-NbC composite, as a metallurgical interphase was formed between matrix and NbC grains. The physical properties of melt grown NbC match those known from powder metallurgically sintered NbC using powders converted from Nb_2O_5.