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Core-shell Ni-Ti(C,N) structures fabricated by precipitation of based-Ni nanoparticles on TiCN suspensions

  • : Miguel de Dios Pérez1, Begoña Ferrari Fernández2, Elena Gordo Odériz1, Zoilo González Granados2
  • : 1University Carlos III of Madrid, 2Spanish Council for Scientific Research (CSIC)
  • : PDF Download
  • : 2015

Abstract

Ti(C,N)-based cermets are currently used in high-speed cutting tools industry due to its 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 TiCN-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 (SEM).

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