Mechanical and electrical characterization of Cu-2 wt.% SWCNT nanocomposites synthesized by in situ reduction

作者：Mendoza M E^*; Solorzano I G; Brocchi E A

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2012, 544: 21-26.

DOI：10.1016/j.msea.2012.02.052

• Composites
• Nanostructured materials
• Sintering
• Thermomechanical processing
• Electron microscopy
• Nanoindentation

Copper-2 wt.% single walled carbon nanotubes (SWCNT) nano composites have been synthesized by a chemical method of dissociation of copper nitrate containing CNTs, followed by reduction under a H-2 atmosphere. Bulk nano-composite pellets were obtained by a pre-compactation under a uniaxial pressure of 60 MPa followed by isostatic pressure of 150 MPa and sintering under Ar atmosphere. Both X-ray diffraction and transmission electron microscopy (TEM) were used as characterization tools. The former confirmed the presence of pure metallic copper with carbon; and the later allowed for the observation of a good dispersion, and also for a proper adherence between Cu particles onto CNT. Powder copper particles were observed to be in the 50-300 nm range, while the bulk Cu-CNT grain size was observed to be in the 150 nm(-3) mu m range. The composite Cu-CNT presented less resistivity at low temperature (2 x 10(-6) Omega cm at 83 K) compared with copper. Hardness measured by nanoindentation exhibited higher values for the composite than for copper (1.7 GPa vs. 1.2 GPa).

• 出版日期2012-5-15