Abstract
Copper-based composites strengthened by ceria nanoparticles were processed by conventional powder metallurgy: mixing (30 min and 46 rpm), compaction (cold, uniaxial, 1080 MPa for 10 s) and sintering (800°C for 6 h in vacuum atmosphere of 10−5 torr). It was studied the microstructure (optical microscopy, scanning electron microscopy), X-ray diffraction with Rietveld refinement and some properties (electrical conductivity, Vickers hardness and fracture analysis) of the compositions 92 wt% Cu - 8 wt% CeO2 and 80 wt% Cu - 20 wt% CeO2. The results showed uniform phase distribution, low porosity and ceria disperse inside copper grain. In despite of properties, the composites had electrical conductivity of 38% IACS and 15% IACS and hardness of 69 and 88 HV5, respectively. The results of 92 wt% Cu - 8 wt% CeO2 composites were promising, and they are in according with actual literature.
Highlights
IntroductionMetal matrix composites (MMCs) consist in adding ceramic particles in a soft metal with the aim to improve its mechanical resistance; this reinforcing phase increases the scattering of electrons on the material and, decreases its electrical conductivity
Copper is widely used in electrical and electronic applications due to its high electrical conductivity; even so, its low mechanical resistance is a barrier for some applications who requires high mechanical stress.Metal matrix composites (MMCs) consist in adding ceramic particles in a soft metal with the aim to improve its mechanical resistance; this reinforcing phase increases the scattering of electrons on the material and, decreases its electrical conductivity
The results showed uniform phase distribution, low porosity and ceria disperse inside copper grain
Summary
Metal matrix composites (MMCs) consist in adding ceramic particles in a soft metal with the aim to improve its mechanical resistance; this reinforcing phase increases the scattering of electrons on the material and, decreases its electrical conductivity. The main challenge of MMCs researches is to get values of electrical conductivity who allow commercial uses of the material [1] [2] [3].
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