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Behavior of feedstocks reinforced with nanotubes for micromanufacturing

  • : Telma Ferreira1, Maria Teresa Vieira1
  • : 1University of Coimbra
  • : PDF Download
  • : 2014


The impressive properties of multiwalled carbon nanotubes (MWCNT) in metal matrix aid to overcome the great challenge of XXI century decreasing weight without losing functionality of structural parts in final products. For high series and complex geometries using powder technology it will be necessary to adjust the new composites feedstocks to microPIM. A non-ferrous metal - copper and ferrous metallic alloy - 316L stainless steel are selected as the metallic matrix. The optimization of composite feedstocks where performed using torque mixing technique. Commercial binder with and without addition of stearic acid (SA) are mixed with copper or 316L steel powders and MWCNT. The feedstocks without nanoreinforced are homogeneous and adequate to be microinjected. The addition of MWCNT (reinforce) to the selected powder material (matrix) increases significantly the torque value, whatever the reinforce content, impairing its processability. The SA addition improves the mixing and help to decrease the torque value. The feedstocks nanoreinforced have homogeneity suitable to be produce by microPIM bulk composites with mechanical properties necessary for structural applications.

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