GLTRS--Glenn
TITLE AND SUBTITLE:
Particle Morphology Effects on Flow Characteristics of PS304 Plasma Spray Coating Feedstock Powder Blend

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

REPORT DATE:
January 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-13057

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-2002-211206

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

ABSTRACT:
The effects of BaF2-CaF2 particle morphology on PS304 feedstock powder flow ability have been investigated. BaF2-CaF2 eutectic powders were fabricated by comminution (angular) and by gas atomization (spherical). The fluoride powders were added incrementally to the other powder constituents of the PS304 feedstock: nichrome, chromia, and silver powders. A linear relationship between flow time and concentration of BaF2-CaF2 powder was found. Flow of the powder blend with spherical BaF2-CaF2 was better than the angular BaF2-CaF2. Flow ability of the powder blend with angular fluorides decreased linearly with increasing fluoride concentration. Flow of the powder blend with spherical fluorides was independent of fluoride concentration. Results suggest that for this material blend, particle morphology plays a significant role in powder blend flow behavior, offering potential methods to improve powder flow ability and enhance the commercial potential. These findings may have applicability to other difficult-to-flow powders such as cohesive ceramics.

SUBJECT TERMS:
Plasma spray coatings; Solid lubrication; Powder flowability; Powder feedstock; Particle morphology; Coatings; Lubrication; Powders

NUMBER OF PAGES:
17

PDF AVAILABLE FROM URL:
2002/TM-2002-211206.pdf
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