engleski

Investigation and Estimation of Residual Stress in Flame Sprayed and Fused NiCrBSi Coatings

Flame (gas) spraying, as a type of thermal spraying, is used for repairing damaged and worn elements of tribomechanical systems, and also for protection of new parts from wear and corrosion in order to prolong service life. Beside good wear and corrosion resistance there is also a need for a good coating/substrate adhesion, reduced porosity and reduced level of residual stresses. Residual stresses that occur in the substrate/coating system are very significant because their relaxation can cause different coating failures. In this paper, different approaches to investigation of residual stresses in thermally sprayed coatings, have been presented. An analytical model (authors Tsui and Clyne) was used to estimate the distribution of residual stresses in flame sprayed and fused NiCrBSi coatings. These data can be used as input data for the numerical model.

residual stress; NiCrBSi coatings; flame spraying and fusing

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