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Preparation and electrical conductivity of graphitic carbon-infused copper alloys

Published online by Cambridge University Press:  29 January 2019

B. Ma Open the ORCID record for B. Ma [Opens in a new window] ,
U. Balachandran ,
S.E. Dorris ,
T.H. Lee  and
A.J. Rondinone
B. Ma*
Affiliation:
Applied Materials Division, Argonne National Laboratory, Argonne, IL 60439, USA
U. Balachandran
Affiliation:
Applied Materials Division, Argonne National Laboratory, Argonne, IL 60439, USA
S.E. Dorris
Affiliation:
Applied Materials Division, Argonne National Laboratory, Argonne, IL 60439, USA
T.H. Lee
Affiliation:
Applied Materials Division, Argonne National Laboratory, Argonne, IL 60439, USA
A.J. Rondinone
Affiliation:
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
*
Address all correspondence to B. Ma at bma@anl.gov
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Abstract

By electron-beam (e-beam) melting, we prepared 0.4 wt% carbon-infused copper (CuCv4), and a copper control without carbon addition (CuCv0). Scanning electron microscopy and helium ion microscopy (HIM) were performed on the as-solidified surface, fracture surface, and ion-polished surface of the CuCv4 sample. The results revealed that graphitic carbon flakes cover the as-solidified surface, and carbon nanoparticles and clusters exist in the fracture and ion-polished surfaces. HIM on the ion-polished surface revealed a unique ripple-shaped feature, which is possibly associated with the infusion of carbon nanoribbons in the copper matrix. The bulk densities were measured to be 8.86 and 8.53 g/cm3, which correspond to relative densities of 98.9% and 96.4% for the CuCv0 and CuCv4 samples, respectively. In addition, apparent electrical conductivities were measured to be 56.9 and 57.5 MS/m, respectively, for the e-beam melted CuCv0 and CuCv4 samples. These values correspond to true electrical conductivities of 100.5% IACS (International Annealed Copper Standard) and 107.4% IACS after correction for the porosity. Our results reveal remarkable promise of using covetic copper for the next generation conductors in energy applications from microelectronic devices to high-power transmission cables.

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 1 , March 2019 , pp. 137 - 143
Copyright
Copyright © Materials Research Society 2019 

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