Mechanical and Structural Characterization of Cu-Ni-Ag/Y2O3 Composites Obtained by Powder Metallurgy

Anderson Kenji Okazaki; Marcos Vinícios Surmani Martins; Marcelo Carvalhal; Waldemar Alfredo Monteiro; Juan Alfredo Guevara Carrió

doi:10.4028/www.scientific.net/MSF.727-728.314

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HomeMaterials Science ForumMaterials Science Forum Vols. 727-728Mechanical and Structural Characterization of...

Mechanical and Structural Characterization of Cu-Ni-Ag/Y₂O₃ Composites Obtained by Powder Metallurgy

Abstract:

Metal-ceramic composites are recently being used as electrode materials in solid oxide fuel cell (SOFC), which have received much attention as alternative energy sources. In this work cermets of Cu-Ni-Ag/Y₂O₃ were synthesized with different quantities of Ni and Ag. Various samples were prepared from pure precursors by conventional powder metallurgy processing and sintered at 800°C. The characterization by differential scanning calorimetry (DSC) and thermal gravimetric analyze (TGA) indicate that the presence of Y₂O₃could increase the corrosion resistance of the metallic copper alloys. The copper crystalline structure presents internal strengths and possibly crystallites with different cell parameters due to the effect of thermal and mechanical treatments in presence of Y₂O₃. The highest electrical conductivity and highest hardness were obtained for the composition with 5% Y₂O₃and 5% nickel, which increases the hardness and could contribute to the higher conductivity through a precipitation mechanism.

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Materials Science Forum (Volumes 727-728)

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314-319

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https://doi.org/10.4028/www.scientific.net/MSF.727-728.314

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August 2012

Authors:

Anderson Kenji Okazaki, Marcos Vinícios Surmani Martins, Marcelo Carvalhal, Waldemar Alfredo Monteiro, Juan Alfredo Guevara Carrió

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Composite, Cu-Ni-Ag/Y₂O₃, Electrical Properties, Rietveld Method, Synchrotron Radiation, Thermal Property

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