Nanotech 2012 Vol. 1
Nanotech 2012 Vol. 1
Nanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)

Composite Materials Chapter 6

Novel Metal-Matrix Composites with Integrally-Bound Nanoscale Carbon

Authors: D.R. Forrest, I. Jasiuk, L. Brown, P. Joyce, L. Salamanca-Riba

Affilation: Naval Surface Warfare Center, United States

Pages: 560 - 563

Keywords: covetic, nanocarbon, composite, metal-matrix

Recent advances in nanomanufacturing have made it possible for large amounts (up to 6 wt.%) of nanoscale carbon to be retained as an integral second phase in metals such as aluminum and copper. The carbon is highly stable despite its presence not being predicted in phase diagrams, and it remains dispersed after remelting and resolidification. Here we present new results, revealing some unexpected properties: -The nanocarbon is detectable by EDS and XPS but not by analytic methods such as LECO and GDMS. -Nanocarbon raises the melting point and surface tension. -Nanocarbon warm-worked and cold-worked strengths are higher than the base metal. -The nanocarbon microstructure is more resistant to softening and grain growth at elevated temperatures. -Nanocarbon enhances thermal conductivity in the extrusion direction, and reduced in the transverse orientation. -Electrical conductivity is increased in aluminum, and maintained in copper. -The composites have higher density than would be predicted from the rule of mixtures.

ISBN: 978-1-4665-6274-5
Pages: 804
Hardcopy: $209.95

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