Evaluation of thermal spray coatings with peel adhesion test PAT

grantor: University of TorontoThis report presents a set of experiments conducted using the peel adhesion test, "PAT", to evaluate the adhesion of a coating on different substrates as well as the adhesion of the coating on substrates with different surface roughness. Finally the effect of two different particle sizes of Ni powder on the adhesion of Ni coatings was examined. These results then were analyzed to correlate the measured adhesion with microstructural features. It was found that the adhesion of the coating to the softer, lower melting point materials is the highest when studying the effect of different substrate materials. Different surface treatment proved that grit blasting is changing the plastic deformation energy of the foil and causing the diagrams to fluctuate, therefore, grinding was chosen to be the surface treatment for the rest of experiments. With less porosity and a denser structure, large particle size coating showed a superior performance to the small particle size coating both in adhesion value and coating quality.M.A.Sc