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| Abstract No.: |
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Scheduled at:
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Monday, May 03, 2010, Olivia Room 5:00 PM
Paper and Printing
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| Title: |
Chemical reaction effects in solution precursor plasma spray
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| Authors: |
Eric Jordan* / University of Connecticut, USA
Chigozie Muoto / University of Connecticut, USA
Maury Gell/ University of Connecticut, USA
Mark Aindow/ University of Connecticut, USA
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| Abstract: |
In traditional suspension spray ceramic powders are suspended in a solvent and when injected into a plasma jet there is evaporation and then melting regardless of the composition. When solutions are used, a number of phenomena in addition to solvent evaporation and melting occur. These phenomena include, formation of gel phase, melting of salts, formation of intermediate non oxide solids and energetic chemical reactions. The relation between these intermediate states in coating microstructure is systematically explored. Particular emphasis is placed on the energetic of the relevant chemical reactions. Differentials thermal analysis shows that both endothermic and exothermic reactions occur and are sufficiently energetic to change particle temperatures by many hundreds of degrees. Engineering these intermediate states and energetics can play an important role in enhancing the success of solution precursor plasma spray. Examples of the energetic determined by differential thermal analysis and intermediate states determined by simple bench experiments will be shown. The general approach of considering the precursor as an oxidizer fuel pair will be presented.
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