Investigation of Plasma Power Effect on the Nicraly/8YSZ Coating Properties

Abstract

In this study, NiCrAlY coating as a bond coat and 8YSZ coating as a top coat were applied on Inconel 718 super alloy substrates by APS method. The plasma power parameter has changed from 24.75 to 34.8 kW. The results show that with increasing the plasma power, the hardness and bond strength increase from 682 to 818 HV and 12.48 to 22.49 MPa, respectively. Also the image analysis shows that the porosity in coatings, decrease from 22.59 percent to 18 percent by increasing the plasma power.