Electric Field Assisted Treatment of Various Plasma Sprayed ZrO_2 Coatings(Physics, Process, Instruments & Measurements)

概要

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A systematic experimental investigation was carried out to clarify the phenomena which occur during the electric field assisted treatment of various ZrO_2 coatings sprayed on copper or SS41 steel substrates ; and the possibility of improving the adhesive strength between substrate and coating by the electric field assisted treatment was examined. It was found that the occurrence of a Zr-Cu-O layer was clearly recognized at the interface between the ceramic coating and the copper substrate, which was arranged as the cathode in the experiment. But the formation of Zr-Cu-O layer was greatly depended on the kinds of ZrO_2 coatings. It was revealed that the adhesive strength of a coating can be raised by the electric field assisted treatment to over a three times of that as for a sprayed ZrO_2 (8wt% Y_2O_3) coating. The electric field assisted treatment was also applied to ZrO_2 (8wt% Y_2O_3) sprayed onto mild steel but no improvement in adhesive strength resulted. However, when the coated steel was heated in air to form an Fe oxide at the coating/substrate interface, the adhesive strength was nearly doubled by a subsequent electric field treatment.
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