Nanotribology and Nanoindentation Response of WC-Fe3Al cermets prepared by Spark Plasma Sintering

Reference Presenter Authors
09-099 Luis Antonio Ccopa Ybarra Ybarra, L.C.(Universidade Nove de Julho/Universidade Federal do ABC); Chimanski, A.(Universidade Federal do ABC); Yoshimura, H.N.(Universidade Federal do ABC); Currently cermets applications are important due to their yield, and time and cost saving, in the manufacture of devices for various industrial, health and environmental fields. Cermets are traditionally composed of cobalt-bonded tungsten carbide particles (WC-Co), but may also have the bond matrices of other materials; cermets are often used as a wear resistant material. Cermets with intermetallic matrix of iron aluminide, WC-10%Fe3Al and WC-10%Fe3Al-B, have been prepared with high mechanical properties. The objective of this work was to study the tribological behavior of these cermets by nanoindentation and determination of the coefficient of friction and wear by nanotribology tests with application of low loads (<0.1 N). WC cermet samples with Fe3Al intermetallic matrix were prepared by the SPS technique (spark plasma sintering). The nanotriboloby tests were carried out in reciprocating mode in dry contact and with lubricant (water, oil), using body of intermetallic matrix cermet and counter-body of different materials (steel, glass, silicon nitride). In addition to nanoindentation and nanotribology tests, the contact regions (wear trails) were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray excited photoelectron spectroscopy (XPS) to verify the chemical and morphological changes and also to help in the understanding of the tribological phenomena involved.
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