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The physical preparation of a surface material to be coated by the thermal spray processing plays very important role as it affects the bonding force between the coating and substrate. when the coating material has different thermal and physical properties than the substrate the thermal residual stresses are generated in a two material system which may reach the level that promotes the coating delamination or cracking. Another factor influencing the stress state in sprayed coatings may lay in the interface profile between the coating and substrate. we may try to affect this factor by analyzing the profile and texture of the substrate surface to be coated. This way we may influence the residual stress built in a deposited coatings. The aim of this paper is to model and analyze the effect of the substrate surface profile on the residual stresses generated during cooling of thermally sprayed metallic coatings onto the ceramic substrates. The numerical computer simulation has been performed to calculate and compare the residual stress state developed in thermally sprayed metallic/ceramic system (niAl/Al2O3). The main factor analyzed was the variation in the shape of the interface profile between the coating and substrate. The obtained results have been discussed.

przegląd spawalnictwa

The effect of the interface profile on the residual stresses formed in thermally sprayed NiAl coatings on Al2O3 substrate; Wpływ kształtu granicy połączenia na naprężenia własne powstające w natryskiwanych powłokach nial na podłożu ceramiki Al2O3