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of a few microns thick and are quite dense. Additionally, they have good adhesion and mechanical properties. Plasma spraying can be used to spray a variety of materials ranging from polymers, metals and even ceramics. One method used for feeding the coating material to the system is via solution. This method is called solution precursor plasma spray (SPSS). Recent studies to better understand the mechanism by which the coating is formed have been undertaken.27-29 Some examples of deposited materials include TiO2,30 ZrO2-Al2O331 and Y2O3-ZrO2.28, 29 5.1.1.1.3 Rapid Expansion of Supercritical Solution Technology 5.1.1.1.3.1 History The idea of precipitating a solid by the sudden reduction of pressure to form a crystal is outlines by Hannay and Hogarth in 1879.32 In 1981,33 Krukonis theorized on the use of this process to tailor the sizes of materials. He then followed this theory with a publication detailing some of the first work in really trying to understand and develop this technique in 1984.34 5.1.1.1.3.2 RapidExpansionofSupercriticalSolutions Rapid expansion of supercritical solutions (RESS) utilizes the changing solvating power of the solvent to create nanometer sized particles. This technique uses the supercritical fluids ability to dissolve relatively large concentrations of material, as compared to a gas, to form a single homogeneous phase. The solution is then expanded across a nozzle, which in itself generates small particles. Additional particle size reduction occurs, due to the pressure drop across the nozzle, from the high pressure 141PDF Image | Supercritical Fluid Deposition Of Thin Metal Films
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