Sanpo N. Solution Precursor Plasma Spray System

Springer International Publishing, Heidelberg, 2014, 100 pages, ISBN: 978-3-319-07024-7, 978-3-319-07025-4Springer Briefs in MaterialsSuspension and solution thermal spraying technology, an attractive technique in coating technology, has been used for depositing nano-structured coatings. It is technically difficult to feed powders of particle size less than 5-10 μm due to the effect of surface forces on powder flow. In the newly-developed suspension plasma spray (SPS) process, nano-sized particles are suspended in a liquid before being injected into the plasma plume; thus circumventing the normal feeding methods. Similarly, the solution precursor plasma spray (SPPS) process deposits melted feedstock onto a substrate as splats. The difference between SPPS and SPS processes is the nature of the feedstock material. The SPPS and SPS methods combine the simplicity and high through-put of the plasma spray process with versatility and economics of the spray pyrolysis process to produce the desired nanostructured materialsThis book focuses on the development of novel multifunctional magnetic ironbased solution in order to use in thermal spray technique. The study deals with the influence of three organic chelating agents; i.e., citric acid (CA), polyvinyl alcohol (PVA) and oxalic acid (OA), on the topography, physical properties and phase of solution precursor plasma spray (SPPS)-deposited spinel ferrite splats. The concentration of all chelating agents in the solution precursor was fixed at 10 %. After the plasma sprayed cobalt ferrite splats were collected, their surface topographies, surface roughness, equivalent diameter (E.D.), elongation factor (E.F.), degree of splashing (D.S.), and elemental composition were characterized using various materials science techniques. Moreover, the concentration of citric acid in the solution precursor was varied from 5 to 20 % to study the effect of the chelating agent contents on the phase composition of cobalt ferrite splats. The splats obtained from CA presented the smoothest surface followed by those splats obtained from OA, PVA, and without chelating agent, respectively. The Raman spectroscopy analyses revealed eight phases in the whole population of splats. Thus, chelating agents influenced the phase composition of cobalt ferrite splats and the highest percentage of cobalt ferrite (CoFe2O4) splats was observed with using CA. Finally, the CA concentration influenced the phase composition of cobalt ferrite splats and more than 90 % of cobalt ferrite phase was formed when using 20 % CA.Solution Precursor Plasma Spray System
Literature Review
Experimental Methods
Influence of the Different Organic Chelating Agents on the Topography, Physical Properties and Phase of SPPS-Deposited Spinel Ferrite Splats
Effect of the Chelating Agent Contents on the Topography Composition and Phase of SPPS-Deposited Cobalt Ferrite Splats
Conclusions
Future Perspectives