Liquid Fragmentation and Coating Construction in Solution and Suspension Plasma Spraying

When solution precursor and suspension are injected in a conventional DC plasma torch by using a mechanical injection device, the plasma jet must provide both for atomization of the liquid jet and treatment of the formed droplets. This study investigates and links the break-up mode of the liquid feedstock and the construction of coating from the impacting droplets for various torch operating conditions. It makes use of a laser shadowgraphy system to experimentally observe the liquid jet fragmentation and various characterization techniques of single droplets and coatings deposited on substrates with a controlled temperature.

The suspension is made up of zirconia nanoparticles in water or ethanol solvent and the solution of Yttrium and Zirconium Nitrate salts dissolved in the same solvents