GLTRS--Glenn
TITLE AND SUBTITLE:
Particle Size Effects on Flow Properties of PS304 Plasma Spray Feedstock Powder Blend

AUTHOR(S):
Malcolm K. Stanford, Christopher DellaCorte, and Daniel Eylon

REPORT DATE:
May 2002

FUNDING NUMBERS:
WU-708-18-13-00

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
John H. Glenn Research Center at Lewis Field
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-13315

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-2002-211550

SUPPLEMENTARY NOTES:
Malcolm K. Stanford and Daniel Eylon, University of Dayton, Materials Engineering, 300 College Park, Dayton, Ohio 45469-0121, and Christopher DellaCorte, NASA Glenn Research Center. Responsible person, Christopher DellaCorte, organization code 5960, 216-433-6056.

ABSTRACT:
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 mm, 45 to 106 mm, 63 to 106 mm, 45 to 53 mm, 63 to 75 mm, and 90 to 106 mm 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.

SUBJECT TERMS:
Coatings; Lubrication; Solid lubricants; Powders; Plasma spray coatings; Powder flowability; Powder feedstock; Particle size

NUMBER OF PAGES:
17

PDF AVAILABLE FROM URL:
2002/TM-2002-211550.pdf
( 834 KB )
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