Authors: C Lyphout S Björklund
Publish Date: 2014/11/21
Volume: 24, Issue: 1-2, Pages: 235-243
Abstract
Electrolytic hard chrome EHC methods are still widely utilized in the printing automotive and offshore industries Alternative methods to EHC have been widely developed in the past decade by conventional HVOF processes and more recently HVAF systems which are processing at higher kinetic energy and more particularly at lower temperature significantly increasing wear and corrosion resistance properties A dedicated internal diameter HVAF system is here presented and coatings characteristics are compared to the one obtained by standard HVAF coatings Specially RD designed fixtures with inside bore of 200 mm have been manufactured for this purpose with a possibility to spray samples at increasing depth up to 400 mm while simulating closed bottom bore spraying WCbased and Cr3C2based powder feedstock materials have been deposited onto highstrength steel substrates Respective coating microstructures thermally induced stresses and corrosion resistance are discussed for further optimization of coating performances The fact that the IDHVAF system is utilized both for spraying and gritblasting procedures is also given a particular interestThe authors would like to acknowledge Mr Slava Baranovski and Mr David Jewell UniqueCoat Technology Virginia US for the internal diameter HVAFspraying experiments presented in this study Mr Jayantha Bandara and Mr Lahiru Thedavikum University of Peradeniya Sri Lanka are gratefully acknowledged for their contribution in characterizing the HVAFsprayed samples at University West Trollhättan Sweden
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