Journal
JOURNAL OF THERMAL SPRAY TECHNOLOGY
Volume 13, Issue 4, Pages 508-514Publisher
SPRINGER
DOI: 10.1361/10599630421406
Keywords
adhesion by mechanical interlocking; fractal analysis; plasma spraying; surface roughness/morphology; titanium and alloys
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A study of the effects of grit-blasting and plasma-spraying angles on the adhesion strength of an alloy (Tribaloy 800) that was plasma sprayed on a titanium-base alloy is reported. Five different spray and grit-blast angles were investigated: 45degrees, 55degrees, 65degrees, 75degrees, and 90degrees. The surface texture in different directions was characterized by the classic average roughness and by a fractal analysis number using a two-dimensional fractal analysis method. The grit residue was measured by an x-ray spectrometer. The study showed that the maximum adhesion strength was close to a 90degrees blasting and spraying angle. However, the grit residue reaches its maximum at a 75degrees blasting angle. From the image analysis of the interface in different directions, it was found that the nonperpendicular grit blasting produces an anisotropic surface. The fractal analysis method showed a rather good correlation with the blasting angle. However, no good correlation between the fractal number and the adhesion strength was found.
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