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ABSTRACT: The adherence of plasma sprayed NiCrAlY bond coats can be improved by an appropriate substrate surface finish. The interface
fracture energy for crack propagation along the coating/substrate interface has been measured for different surface roughness
by means of a specially designed four-point bending test. An increase of the interface fracture energy of about 15% was observed
for a three times higher surface roughness. In addition, four-point bending tests with the coating on the side face of bending
specimens were performed to analyze the fracture and spalling behavior of the coatings both under large tensile and compressive
substrate deformations.
Journal of Thermal Spray Technology 04/2012; 11(3):387-392. · 1.81 Impact Factor
