Effects of tungsten carbide and cobalt particles on corrosion and wear behaviour of copper matrix composite

T. F. Wu, S. L. Lee, M. H. Chen, Z. G. Li, J. C. Lin

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Copper matrix composites reinforced with various contents (10-20 wt-%) and sizes (1-9 μm) of tungsten carbide particles (WCp) and cobalt particles (Cop, 1.5 μm and 5 wt-%) were fabricated by hot pressing. The effects of WCp and Cop on the wear and corrosion properties of the copper composites were evaluated. Dry wear testing was conducted in ambient conditions and wear corrosion testing was carried out in 3.5 wt-%NaCl solution (pH 6.7). The results show that the hardness, wear resistance and static corrosion weight loss of Cu/WCp composites increase with a decrease of WCp size or with an increase of WC p content, Also, the corrosion current density /corr increases with a decrease of WCp size or with an increase of WC p content, and the corrosion potential Ecorr exhibits no specific trend with varying WCp content and size. The wear corrosion rate increases with an increase in WCp content, yet shows no direct correlation with WCp size. On the other hand, Cu/WC p/Cop composites exhibit better wear resistance in both dry wear and corrosive wear conditions. The Cu/WCp/Cop composites show a much lower Ecorr and significantly more passivity than Cu/WCp composites in polarisation tests. The Cu/WC p/Cop composites exhibit excellent wear corrosion resistance, especially in the passive potential (Ep) state.

Original languageEnglish
Pages (from-to)295-304
Number of pages10
JournalMaterials Science and Technology
Volume21
Issue number3
DOIs
StatePublished - Mar 2005

Keywords

  • Co
  • Corrosion
  • Cu MMCs
  • Hot pressing
  • WC
  • Wear

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