J Mater Sci Technol ›› 2003, Vol. 19 ›› Issue (Supl.): 133-134.

• Research Articles • Previous Articles     Next Articles

Microstructure of Co-Ni-Al2O3 Composite Coatings by Electroforming

Gang WU, Ning LI, Derui ZHOU, Kurachi Mitsuo   

  1. Dept. of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2003-12-28 Published:2009-10-10
  • Contact: Gang WU

Abstract: The metal matrix composite coatings of Co-Ni- Al2O3 were studied by electrolytic codeposition of Co-Ni alloys and Al2O3 on a Cu substrate from a sulfamate electrolyte containing Al2O3 particles. It was illustrated from the examined results of SEM, AFM and XRD that surface morphology and microstructure of Co-Ni- Al2O3 coatings appear to be mainly influenced by variations in Co content. The high Co content coatings with hcp lattice structure have a more uniform and fine structure than that of low Co content coatings with fcc lattice structure. The codeposition of Al2O3 particles in Co-Ni alloys can not change the phase structure of solid solution, only affects the growth and orientation of crystal planes and mostly increase the d value of lattice.

Key words: Electroforming, Composite coatings, Cobalt-Ni alloys, Alumina