Abstract
Wire-arc-sprayed nickel-aluminum is widely used in the aircraft industry for dimensional restoration of worn parts and as a bond coat for thermal barrier coatings and other top coats. Some repair applications require thick coatings, which often result in lower bond strength. A mechanism being investigated to ex-plain this decrease in bond strength is the free edge effect, which includes both coating residual stresses and coating thickness. The layer-removal method was used to determine experimentally the residual stresses in wire-arc-sprayed nickel-aluminum coatings of different thicknesses. Bond strength evalu-ations were performed using an improved ASTM C 633-79 test specimen. Finite-element analysis and fracture mechanics were used to investigate the effects of coating thickness and residual stress state on coating bond strength.
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Greving, D.J., Shadley, J.R., Rybicki, E.F. et al. Effects of coating thickness and residual stresses on the bond strength of ASTM C633-79 thermal spray coating test specimens. JTST 3, 371–378 (1994). https://doi.org/10.1007/BF02658982
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DOI: https://doi.org/10.1007/BF02658982