Abstract
A good dispersion of powders is crucial to obtain the sintered materials with superior properties. In this paper, the application of different dispersants in fabricating Ti (C,N)-based cermets was investigated. The effect of dispersant on the microstructure and mechanical properties of cermet materials was studied by observing the microstructure, indention cracks and fracture morphology using scanning electron microscope (SEM), and by measuring the transverse rupture strength (TRS), Vickers hardness (HV) and fracture toughness (KIC). The results reveal that the dispersant oleic acid is helpful for the dispersion of Ti (C,N)-based cermet powders, and can contribute to the homogeneous microstructure and stable mechanical properties of the cermet materials. Compared with the cermets fabricated with polyethylene glycol (PEG), the microstructure of cermets fabricated with oleic acid shows more homogeneously distributed Ti (C,N) particles embedded into more evenly spread binder phases without agglomerations of Ti (C,N) grains. The cermets fabricated with oleic acid possess better comprehensive mechanical properties, with higher transverse rupture strength, hardness and a bit lower fracture toughness than the cermets fabricated with PEG.
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