Corrosion and abrasive wear behaviour of laser consolidated plasma sprayed SiC coating on Fe-15Cr-25Ni alloy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)490-494
Journal / PublicationSurface Engineering
Issue number6
Publication statusPublished - 1999


Silicon carbide powders (75 μm) were plasma sprayed on austenitic Fe-15Cr-25Ni alloy. A continuous wave CO2 laser was used to consolidate the plasma sprayed layer and to decompose SiC particles during glazing. Optical and scanning electron microscopic techniques revealed that the structure of the laser consolidated layer consisted of cellular dendrites with M7C3 carbides dispersed mainly at the dendritic boundaries. Consequently, the surface hardness of the Fe-15Cr-25Ni alloy improved considerably. Abrasive wear tests showed that the laser modified specimen exhibited lower wear mass loss and a lower coefficient of friction than the raw Fe-15Cr-25Ni alloy. Potentiodynamic and cyclic polarization behaviour of the laser modified and raw Fe-15Cr-25Ni alloy specimens in 0.5 M H2SO4 and 0.5 M NaCl solutions was also investigated.