Effect of particle morphology on flow characteristics of a composite plasma spray powder |
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Authors: | Malcolm K Stanford Daniel Eylon Christopher DellaCorte |
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Affiliation: | (1) University of Dayton, 45469-0121 Dayton, OH;(2) National Aeronautics and Space Administration, Glenn Research Center, 44135 Cleveland, OH |
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Abstract: | The effects of BaF2-CaF2 particle morphology on National Aeronautics and Space Administration (NASA) PS304 feedstock powder flowability were investigated,
BaF2-CaF2 eutectic powders were fabricated by comminution (producing an angular morphology) and by gas atomization (producing a spherical
morphology). The fluoride powders were added incrementally to the other powder constituents of the NASA PS304 feedstock, (Ni-Cr,
Cr2O3, and Ag powders). A linear relationship between flow time and concentration of the BaF2-CaF2 powder was found. The flow of the powder blend with spherical BaF2-CaF2 was better than that with angular BaF2-CaF2. The flowability of the powder blend with angular fluorides decreased linearly with increasing fluoride concentration. However,
the flow of the powder blend with spherical fluorides was independent of fluoride concentration. The results suggest that
for this material blend, particle morphology plays a significant role in flow behavior, offering potential methods to improve
powder flowability and enhance the commercial potential. These findings may be applicable to other difficult-to-flow powders
such as cohesive ceramics. |
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Keywords: | coatings particle morphology plasma spray coatings powder flowability solid lubrication |
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