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| Abstract No.: |
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Scheduled at:
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Tuesday, September 27, 2011, Saal C2.2 12:15 PM
Powders, Wires & Suspensions
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| Title: |
What makes a good precursor for solution plasma spray
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| Authors: |
Eric Jordan* / University of Connecticut, USA
Chigozie Muoto / Univeristy of Connecticut , USA
Mauice Gell/ Univeristy of Connecticut , USA
Mark Aindow/ Univeristy of Connecticut , USA
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| Abstract: |
Solution precursor plasma spray is done by injecting liquid chemical precursors into an air plasma spray system in place of powder. This process allows the rapid exploration of new compositions because new compositions can easily be made using wet chemistry. In addition fine scale two phase materials and amorphous phase can be readily made because the materials are molecularly mixed. Solutions however present extra challenges as not all or even most are suitable for solution spray. In this work a very successful precursor used for making thermal barrier coatings based on zirconium acetate was compared with less successful nitrate and acetate precursor used for making MgO: Y2O3 composites. Fundamental properties of these precursors were measured including, viscosity, surface tension, density of restating ceramics on pyrolysis and heat release and absorption on pyrolysis using differential scanning calorimetry. From the comparison, low particle density upon pyrolysis and large endothermic reactions are identified as undesirable precursor properties. Screening methods to eliminate unpromising precursors from consideration prior to spraying are described.
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