Effect of stand-off distance (SOD) on damping properties of atmospheric plasma sprayed alumina-zirconia ceramic coatings

Abstract

Alumina-25 wt-% zirconia (AZ) coatings were deposited on AISI304 stainless steel substrates by atmospheric plasma spraying (APS) technique with three different stand-off distances (SOD) namely, 75, 100 and 125 mm. X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques were utilized to study the phases and microstructures of the coatings, respectively. Surface roughness and percentage of open porosity of the coatings were also quantified by confocal laser scanning microscopy (CLSM) and SEM image analysis through Material Plus software, respectively. Finally, dynamic mechanical analyser (DMA) was employed for thorough investigation of the damping behaviours of the AZ coatings deposited at SODs conditions.

Effect of Varying Stand-off Distance on Tribological and Mechanical Properties of Plasma Sprayed Hydroxyapatite Coated Metallic Substrates

“…On the other hand, porosity is increased at longer 280 mm SOD from 230 mm to 280 mm, some HA particles might be unable to reach the end of the sample due to the journey of long-distance and reduction in velocity of melted particles. The particles could solidify partially before reaching to the substrate samples due to the long distance and the drop in plume temperature which in turn produces splats which are randomly deposited leading to form further micro-pores structure and as observed and also reported in published research [37]. The hardness and elastic modulus values for different HA-coated samples at various SODs are as shown in table 5.…”