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3012 |
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The solution precursor plasma spraying process for making zirconia based electrolytes |
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Claudia Christenn / DLR - German Aerospace Center -
Institute of Technical Thermodynamics, Germany Asif Ansar / DLR - German Aerospace Center / Institute of Technical Thermodynamics, Germany |
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The Solution Precursor Plasma Spray (SPPS) process is a single-step to synthesize nano-sized materials directly from chemical precursors and to deposit coatings within the same step, avoiding a separate processing method for preparation of powder feedstock. It involves the injection of atomized droplets of chemical precursors into the plasma flame. Advantages of using SPPS are the use of wide variety of novel materials by adjusting the stoichiometry of the solution and the production of fine particles. Nano-sized materials can be synthesized without handling disadvantages of nano-scale feedstock powders. Depending on time-temperature history of the droplets in the plasma the properties of resultant deposits are ranging from ultra-fine splats to unmelted crystalline particles to unpyrolized particles. For each application relationship between process, microstructure and property has to be defined. For functional layers of solid oxide fuel cells (SOFCs) ceramic layers which can be prepared by plasma spray process are used, i.e. yttria-stabilized zirconia (YSZ) for the gas tight oxygen ion conductive electrolyte and for the porous anode. Results of SPPS process to make YSZ layers will be presented. |