Wear Response of Aluminum Matrix Composites Reinforced by WC Nanoparticles and Aluminide Particles
What is it about?
Aluminum matrix composites were prepared by adding submicron sized WC particles into a melt of Al 1050 under mechanical stirring, with the scope to determine: (a) the most appropriate salt flux amongst KBF4, K2TiF6, K3AlF6 and Na3AlF6 for optimum particle wetting and distribution and (b) the maximum carbide volume fraction (CVF) for optimum response to sliding wear. The nature of the wetting agent notably affected particle incorporation, with K2TiF6 providing the greatest particle insertion. A uniform aluminide (in-situ) and WC (ex-situ) particle distribution was attained. Two different sliding wear mechanisms were identified for low CVFs (≤1.5%), and high CVFs (2.0%), depending on the extent of particle agglomeration.
Why is it important?
This work continues a preliminary study  within the framework of manufacturing competitive PRAMCs by following four main directions: a) adopting low cost, simple fabricating techniques, b) using ceramic nanoparticles as primary additions to exploit the advantages of the ultra-fine size, c) using low particle additions to reduce particle clustering and raw material costs and d) pursuing secondary in-situ reinforcing particle formation for further property improvement. The present effort has two objectives: a) to investigate the effect of a series of salt fluxes on the WC particle incorporation and the wear behavior of the resulting composites, b) to determine the highest WC particle addition into the alloy melt before deterioration of wear performance starts.
The following have contributed to this page: Angeliki Lekatou