Effects of graphite on wear and corrosion behaviour of SiC p-reinforced copper matrix composites formed by hot pressing

Ten Fu Wu, Zheng Wei Qiu, Sheng Long Lee, Zheng Guo Lee, Jing Chie Lin

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The wear and corrosion properties of SiCp/graphite reinforced copper metal matrix composites (MMCs) fabricated by hot pressing have been evaluated. Electron microscopic studies were conducted to clarify the micromechanisms of wear and corrosion. The experimental results indicate that the hardness and wear loss increase with increasing SiCp content but decrease with increasing graphite content. In particular, the wear loss decreases with increasing graphite up to a content of 5 vol.-% then remains approximately constant as the graphite content is further increased to 7-5 vol-%. The material porosity of the composites increased with the content of foreign particles (SiCp and/or graphite). The composites were immersed in an aqueous solution of 3-5 wt.-%NaCl at pH 6-7 for potentiodynamic and corrosion rate measurements. Pure copper exhibited the best corrosion resistance. The Cu/SiCp composite showed lower resistance, and the Cu/SiCp/graphite composite had the lowest resistance to corrosion. The poor corrosive properties of the composites were the result of galvanic and crevice corrosion, which were influenced by residual stress/strain and differences in electrochemical potential between the additions (SiCp and/or graphite) and the copper matrix. Furthermore, the weight loss due to corrosion increased with increasing SiCp and graphite content.

Original languageEnglish
Pages (from-to)229-235
Number of pages7
JournalCorrosion Engineering Science and Technology
Volume39
Issue number3
DOIs
StatePublished - Sep 2004

Keywords

  • Corrosion resistance
  • Cu-matrix composites
  • Hot pressing
  • Wear loss

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