Chapter 82. Particle Size Effects on Flow Properties of Ps304 Plasma Spray Feedstock Powder Blend

  1. Waltraud M. Kriven and
  2. Hua-Tay Lin
  1. Malcolm K. Stanford1,
  2. Christopher Dellacorte2 and
  3. Daniel Eylon3

Published Online: 27 MAR 2008

DOI: 10.1002/9780470294802.ch82

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: A: Ceramic Engineering and Science Proceedings, Volume 24, Issue 3

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: A: Ceramic Engineering and Science Proceedings, Volume 24, Issue 3

How to Cite

Stanford, M. K., Dellacorte, C. and Eylon, D. (2003) Particle Size Effects on Flow Properties of Ps304 Plasma Spray Feedstock Powder Blend, in 27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: A: Ceramic Engineering and Science Proceedings, Volume 24, Issue 3 (eds W. M. Kriven and H.-T. Lin), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294802.ch82

Author Information

  1. 1

    Materials Engineering University of Dayton Dayton, Ohio 45469-0121

  2. 2

    National Aeronautics and Space Administration Glenn Research Center Cleveland, Ohio 44135-3191

  3. 3

    Materials Engineering University of Dayton Dayton, Ohio 45469-0240

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 2003

ISBN Information

Print ISBN: 9780470375839

Online ISBN: 9780470294802

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Keywords:

  • nitride;
  • microhardness measurements;
  • exhaust gas recirculation;
  • coating surfaces;
  • carbon tool material

Summary

The effects of BaF2-CaF2 particle size and size distribution on PS304 feedstock powder flowability have been investigated. Angular BaF2-CaF2 eutectic powders were produced by comminution and classified by screening to obtain 38 to 45 μrn, 45 to 106 μm, 63 to 106 μm, 45 to 53 μm, 63 to 75 μm, and 90 to 106 μm particle size distributions. The fluorides were added incrementally from 0 to 10 wt% to the other powder constituents of the PS304 feedstock: nichrome, chromia, and silver powders. The flow rate of the powder blends decreased linearly with increasing concentration of the fluorides. Flow was degraded with decreasing BaF2-CaF2 particle size and with increasing BaF2-CaF2 particle size distribution. A semi-empirical relationship is offered to describe the PS304 powder blend flow behavior. The Hausner Ratio confirmed the funnel flow test results, but was slightly less sensitive to differences in BaF2-CaF2 particle size and size distribution. These findings may have applicability to other powders that do not flow easily, such as ceramic powders.