Electrically conductive composite powders and compounds produced with solid state synthesis

Mikko Karttunen (Corresponding Author), Pekka Ruuskanen, Jouni Enqvist

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

Electrically conductive composite powders and compounds were produced using a mechanical alloying method. As starting materials, copper powder and a mixture of butadiene–acrylonitrile-copolymer and polyvinylchloride were used. After alloying, the powderlike material consisted of a mixture of fine copper powder embedded in the polymer matrix. Milling resulted in a copper powder of particle size 300 nm to 2 μm. The alloyed powders were compacted at a pressure of 0.37 GPa at 90°C with a holding time of 1 minute. The resistivity of the compound was measured to be 8.6 × 10−4 ohm-cm. The unusual reduction in particle size to the nanometer level and formation of spherically formed copper polymer composite particles is explained by the reactions of the copper atoms with cyano and other functional groups of the polar polymers. The structurally modified polymer forms a tight encapsulation coating on the surface of the copper, and the flat-formed metal particles are recovered in spherical form due to strong interfacial forces, resulting in increased electrical conductivity.
Original languageEnglish
Pages (from-to)887 - 892
Number of pages6
JournalMaterials and Manufacturing Processes
Volume20
Issue number5
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

Keywords

  • ball milling
  • butadine-acrylonitrile-copolymer
  • composite powder
  • copper powder
  • cyano-groups
  • electrical conductivity
  • mechanical alloying
  • metal particle
  • nanometer scale
  • particle size
  • polymer compound
  • polyvinylchloride
  • process control agent
  • volume resistivity

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