Publication: Core-shell Ni-Ti(C,N) structures fabricated by precipitation of based-Ni nanoparticles on TiCN suspensions
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2015
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European Powder Metallurgy Association (EPMA)
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Abstract
Ti(C,N)-based cermets are currently used in high-speed cutting tools industry due to their high thermal stability. In previous works, Fe was proposed as metal matrix, however the use of iron as continuous matrix strongly affects the processing due to the low wetting capability of molten Fe with the reinforcement phase, Ti(C,N). To solve this problem the use of alloys such as FeNi has been proposed, where Ni improves the wettability between the ceramic and the metal phases. This work proposes a bottom-up approach to build the cermet microstructure through the synthesis of metal nanoparticles on the surface of Ti(C,N) micrometric particles, creating core-shell Ti(C,N)-Ni structures. For that purpose, synthesis parameters to obtain Ni nanoparticles were optimized and then, a one-pot synthesis procedure was tested to obtain core-shell Ti(C,N)-Ni particles by the chemical precipitation of Ni nanoparticles onto the surface of micronic Ti(C,N) particles previously stabilized in an aqueous suspension. Nickel nanoparticles and subsequent core-shell were characterized by measuring the particle size by Dynamic Light Scattering (DLS), X-Ray Diffraction (XRD), field emission scanning electron microscopy (FE-SEM).
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Proceedings of: European Congress and Exhibition on Powder Metallurgy (Euro PM2015 Congress & Exhibition), Reims (France), 4-7 September 2015
Keywords
Core-shell, Ti(C,N)-based cermets, Nanoparticles, Chemical precipitation, Suspensions
Bibliographic citation
Euro PM2015 Proceedings: hard materials, alternative binders. Shrewsbury (U.K.): European Powder Metallurgy Association (EPMA), 2015