Standardization of Metallographic Practices for Thermally Sprayed Coatings in the Automotive Industry

G.A. Blann

Abstract

Thermally-sprayed coatings are applied 10 various materials 10 provide protection for beat-loaded parts as well as corrosion and wear. They also serve as a thermal barrier 10 reduce metal substrate temperatures. Microstructural analysis is used to characterize the substrate, the coating, and the adherence of the coating 10 the substrate. Accurate evaluation or these coatings depends heavily upon the quality of the polished surface produced by metallographic preparation. A well-prepared surface must first be free c1 plucked material and have minimal relief between the hard and soft constituents. The entire surface must be flat to allow a clear view of the interface and any reaction products that might be present in the coating or the substrate. Furthermore, the finished polished specimen must be scratch-free and have no resolution destroying films or stains. Various metal and oxide coatings on ferrous substrate material are used 10 demonstrate the excellent microstructural detail that is revealed when correct polishing procedures are used. These special techniques successfully address the problems normally encountered when preparing hard, brittle coatings or softer metallic coatings and substrates. As a result, clear microstruct...Continue Reading

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