Interface Bond Study of Piston Ring Face Coatings

Some high output diesel engines require ring face coatings that can withstand mechanical and thermal stresses beyond the capabilities of chromium plate. Until such a time when superior coating systems are available, plasma arc coatings are being used to fill the gap. This paper discusses the results of tests aimed at reducing the incidence of bond break-down at the interface of plasma sprayed coatings applied to the piston ring face.