Phase composition, microstructure and microhardness of electroless nickel composite coating co-deposited with SiC on cast aluminium LM24 alloy substrate

M. Franco, W. Sha, S. Malinov, R. Rajendran

Research output: Contribution to journalArticle

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Abstract

Electroless Ni–P (EN) and composite Ni–P–SiC (ENC) coatings were developed on cast aluminium alloy substrate, LM24. The coating phase composition, microstructure and microhardness were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) and microhardness tester, respectively, on as-plated and heat-treated specimens. The original microstructure of the Ni–P matrix is not affected by the inclusion of the hard particles SiC. No formation of Ni–Si phase was observed up to 500 °C of heat treatment. The microhardness is increased on incorporation of SiC in Ni–P matrix. The hardening mechanism is the formation of intermetallic phase Ni3P on annealing at elevated temperature.
Original languageEnglish
Pages (from-to)755–763
Number of pages9
JournalSurface and Coatings Technology
Volume235
Early online date07 Sep 2013
DOIs
Publication statusPublished - 25 Nov 2013

Keywords

  • Aluminium
  • Electroless Ni–P–SiC
  • Phase transitions
  • Scanning electron microscopy
  • Microhardness

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