Mechanics & Industry
Volume 16, Number 7, 2015STANKIN 85: advanced machining methods and techniques
|Number of page(s)||5|
|Published online||30 November 2015|
Spark plasma sintering of zirconia/nano-nickel composites
Centro de Investigación en Nanomateriales y Nanotecnología (CINN)
[Consejo Superior de Investigaciones Científicas (CSIC)-Universidad de Oviedo
(UO)-Principado de Asturias (PA)]; Avenida de la Vega 4-6,
33940, El Entrego, Asturias,
2 Department of Applied Physics and Electromagnetism, Universitat de Valencia, 46100 Burjassot, Spain
3 Moscow State University of Technology “STANKIN”, 1 Vadkovsky per., 127994 Moscow GSP-4, Russian Federation
4 Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Cientificas (CSIC), Cantoblanco, 28049 Madrid, Spain
a Corresponding author:
Accepted: 15 October 2015
This work describes a whole processing route for obtaining dense and nanostructured zirconia-nickel composites with low contents of metallic phase (1–3.5 vol%). For the processing route, a combination of spray-freezing and lyophilization has been proposed. After the calcination and reduction of the resulting powders an X-ray and HRTEM characterization has been performed. This showed the formation of pure zirconia and nickel, well dispersed and homogeneously distributed, nanostructured phases. The obtained powders were subsequently sintered by Spark Plasma Sintering (SPS). As a result, dense ZrO2-Ni composites were obtained, revealing that the sizes of the metal particles were kept in the nanometer range and appear homogeneously and well dispersed into the ceramic matrix. The mechanical behavior of these materials was evaluated by means of the Vickers hardness, showing and increment of about 25% with respect to pure zirconia with only a Ni concentration of 1 vol%.
Key words: Spark plasma sintering / nanomaterials / nanocomposites / nanoceramics / powder materials / zirconia-nickel composites / mechanical properties
© AFM, EDP Sciences 2015
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