Abstract
Shear delamination strengths of plasma-sprayed CoNiCrAlY coatings were examined using an edge-indentation method. In order to examine the effects of spraying treatments on delamination strengths of sprayed coatings, APS CoNiCrAlY, LPPS CoNiCrAlY and LPPS CoNiCrAlY with diffusion thermal aging were fabricated. Load-displacement curves during the indentation were measured, and delamination energy per delamination area was estimated. The delamination load was large when the distance from an edge was large, however the energy was almost independent of the distance from an edge. The delamination energy of APS coating and LPPS coatings were found to be almost the same. The delamination energy of the LPPS coating with diffusion thermal aging was found to be larger than those of both APS and LPPS coatings. It was concluded that diffusion thermal aging was effective in improving the delamination strength.
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