Mechanical and structural characterization of Cu-Ni-Ag/Y2O3 composites obtained by powder metallurgy
Tipo
Artigo de evento
Data de publicação
2012
Periódico
Materials Science Forum
Citações (Scopus)
2
Autores
Okazaki A.K.
Martins M.V.S.
Carvalhal M.A.
Monteiro W.A.
Carrio J.A.G.
Martins M.V.S.
Carvalhal M.A.
Monteiro W.A.
Carrio J.A.G.
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Resumo
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 800oC. The characterization by differential scanning calorimetry (DSC) and thermal gravimetric analyze (TGA) indicate that the presence of Y2O3 could 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% Y2O3 and 5% nickel, which increases the hardness and could contribute to the higher conductivity through a precipitation mechanism. © (2012) Trans Tech Publications, Switzerland.
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Assuntos Scopus
Alternative energy source , Crystalline structure , Electrical conductivity , Mechanical treatments , Metal-ceramic composites , Powder metallurgy processing , Precipitation mechanism , Structural characterization