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

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Abstract

Electroless Ni-P (EN) and composite Ni-P-SiC (ENC) coatings were developed on cast aluminium alloy, 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 upto 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. Overall, the composite coating (ENC) was found to be superior as compared to particles free (EN) coating in both as-deposited and heat-treated conditions.
Original languageEnglish
Publication statusPublished - Sep 2013
EventE-MRS 2013 Fall Meeting, Symposium: E Perspective composites: materials, production, design, analysis, applications and markets - Warsaw University of Technology, Warsaw, Poland
Duration: 16 Sep 201320 Sep 2013

Conference

ConferenceE-MRS 2013 Fall Meeting, Symposium: E Perspective composites: materials, production, design, analysis, applications and markets
CountryPoland
CityWarsaw
Period16/09/201320/09/2013

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