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Influence of heat treatments on the cohesion and adhesion strength of plasma-sprayed deposits

par Diltoer, Jacqueline ;Othmezouri, Jacqueline;Charlier, Jacques
Référence Thin solid films, 192, 1, page (97-109)
Publication Publié, 1990-11

Article révisé par les pairs

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Résumé :

The aim of our work is to study the influence of subsequent heat treatments on plasma-sprayed deposits. The following coatings have been investigated: Ni-20wt.% Cr, Cr2O3, (Ni-20wt.%Cr)+(ZrO2-8wt.%Y2O3). Two steels were chosen as substrate: a chromium ferritic steel and an austenitic steel. Tensile tests were performed to evaluate the cohesion of the coating or the adhesion strength to the substrate. Optical and scanning electron microscopy, and diffusion measurements in the boundary layer by X-ray microanalysis were used to explain the mechanical results. Heat treatments at 500°C do not modify the bond strength of the deposits; on the contrary, heat treatments at a high temperature (800 or 900°C) improve markedly the adhesion strengths of the NiCr and Cr2O3 deposits. Moreover this treatment produces a densification of the Cr2O3 deposit; for (NiCr) +(ZrO2-Y2O3) the improvement is small. © 1990.