Microstructural analysis of composite Cu-Cr-Ag-(CeO2, Al2O3) processing by powder metallurgy
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2017
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Acta Microscópica
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Copper has long been used by mankind, since the 20th century they have gained industrial and
technological importance [1]. They can be combined with ceramic materials in the synthesis of
modern composites, optimized and with balanced properties [2]. The studied composite has a metal
as a matrix (copper or copper, chromium and silver), the ceramic oxide as the reinforcing phase
(ceria or alumina) and was synthesized by powder metallurgy. A possible application of this
material is like anodes in Solid Oxide Fuel Cells (SOFC), cermets based on rare earth oxides and
metals such as copper, silver and nickel have been studied in this component [3]. The objective of
this work was the analysis of the particle size by SEM and chemical composition by EDS of the
starting material (powders of copper, chromium, silver, ceria and alumina) and the microstructural
characterization by MO of copper composites with four compositions: (a) 80% Cu – 8% Cr – 4%
Ag – 8% CeO2; (b) 80% Cu – 20% CeO2; (c) 80% Cu – 8% Cr – 4% Ag – 8% Al2O3; (d) 80% Cu –
20% Al2O3. For analysis in the SEM/EDS the powders were fixed in the sample port with carbon
paint, for the powders of ceria and alumina was made gold coating for 2 min. The copper powder
presented nodular agglomerates; the chromium powder presented large particles with coarse
contours and irregular shape; the silver powder presented a dendritic shape; the ceria powder
presented very small particles and it was not possible to observe them due to the limitation of the
SEM and the alumina powder presented flake-shaped agglomerates, figure 1. The EDS
microanalysis results for copper, silver, ceria and alumina powders were adequate, for chromium
powder indicated silicon and iron (manufacturer predicted) and calcium impurities (not predicted
but with low percentage), figure 1. The powders were weighed on a precision balance (according to
each composition), mixed manually and cold-compacted in uniaxial press with 180 MPa pressure
and sintered in a tubular furnace with vacuum of 10-7
torr, temperature of 750 °C and time of 6 h.
The samples were obtained in laboratory scale with a 31x12x 3.5 mm parallelepipedal shape, hot
mounting, grinded (240, 320, 400, 600, 800) and polished (3μm and 1μm diamond and 0.02 μm
silica). The optical micrographs indicated coalescence of copper particles, homogeneity, porosity
and an unknown (black) phase, possibly related to ceramic materials, figure 2. The sample (c) was
the only one that presented different microstructure between the normal and transverse directions,
possibly due to segregation of the powders during mixing. It was possible to make an adequate
analysis of the particle formats of the copper, chromium, silver and alumina powders; however, the
ceria powder needs to be analyzed again in SEM with higher capacity of increase. The results of
EDS microanalysis were promising for all powders. The optical micrographs suggest a good
adequacy of the compaction and sintering parameters, forming a homogeneous microstructure and
with the desired porosity, except for sample (c), that the mixture was not suitable. In order to study
the formed phases it is necessary to perform an X-ray mapping on SEM and X-ray diffraction in the
samples after sintering.
Como referenciar
FONSECA, DANIELA P.M. da; MONTEIRO, WALDEMAR A. Microstructural analysis of composite Cu-Cr-Ag-(CeO2, Al2O3) processing by powder metallurgy. Acta Microscópica, v. 26, p. 280-281, 2017. B. Disponível em: http://repositorio.ipen.br/handle/123456789/29128. Acesso em: 23 Mar 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.