Influence of in-flight particle state diagnostics on properties of plasma sprayed YSZ-CeO₂nanocomposite coatings

Abstract

This article describes the influence of controlling in-flight hot particle characteristics on properties of plasma sprayed nanostructured yttria stabilized zirconia (YSZ) coatings. This article depicts dependence of adhesion strength of as-sprayed nanostructured YSZ coatings on particle temperature, velocity and size of the splat prior to impact on the metallic substrate. Particle temperature measurement is based on two-color pyrometry and particle velocities are measured from the length of the particle traces during known exposure times. The microstructure and adhesion strength of as-sprayed nano-YSZ coatings were studied. Field emission scanning electron microscopy results revealed that morphology of coating exhibits bimodal microstructure consisting of nano-zones reinforced in the matrix of fully melted particles. The coating adhesion strength is noticed to be greatly affected by the melting state of agglomerates. Maximum adhesion strength of 42.39 MPa has been experimentally found out by selecting optimum levels of particle temperature and velocity. The enhanced bond strength of nano-YSZ coating may be attributed to higher interfacial toughness due to cracks being interrupted by adherent nano-zones.

Tribology of Ti6Al4V: A review

“…The implementation of yttria-stabilized zirconia (YSZ) coatings doped with lanthanum (La) and cerium (Ce) has been observed to be common practice to enhance the abrasive and erosive wear resistance of the material. Unfortunately, YSZ appendage layers are identified to get spalled off at tribo-interactive sliding conditions of long duration [18]. The recognized practical incompetency of coatings has led the focus on the structural modification of material to minimize imposed damage/material loss due to the impinging wear mechanisms [19][20][21].…”

Modelling of Alumina Splat Solidification on Preheated Steel Substrate Using the Network Simulation Method

“…After impact, the particles solidify on the substrate producing thin and dense lamellae or layers, called splats, whose shape depends on the size, shape and powder material properties, flying particle temperature and impact velocity and roughness and temperature of the substrate, in short, heat transfer and flow fluid. The coating's main characteristics, the adhesion strength on the substrate and the residual stresses generated at the interface depend on these properties [1,[4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Manufacturing parameter analysis for alumina coating on steel substrate by automated image processing of isolated splats samples

“…As far as splat solidification on the substrate is concerned, the conditions that affect this phenomenon are: 1. the oxidation, phase, and size, which are characteristics of the impacting particles [ 7 – 12 ]; 2. the surface roughness, presence of condensate and adsorbate, wetting ability, thermal contact resistance and temperature, which are thermophysical properties [ 13 – 18 ]. Thus, during splat solidification and cooling, several effects occur.…”