GLTRS--Glenn
TITLE AND SUBTITLE:
Effects of Humidity on the Flow Characteristics of PS304 Plasma Spray Feedstock Powder Blend

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

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-13313

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-2002-211549

SUPPLEMENTARY NOTES:
Malcolm K. Stanford, 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 environmental humidity on the flow characteristics of PS304 feedstock have been investigated. Angular and spherical BaF2-CaF2 powder was fabricated by comminution and by atomization, respectively. The fluorides were added incrementally to the nichrome, chromia, and silver powders to produce PS304 feedstock. The powders were dried in a vacuum oven and cooled to room temperature under dry nitrogen. The flow of the powder was studied from 2 to 100 percent relative humidity (RH). The results suggest that the feedstock flow is slightly degraded with increasing humidity below 66 percent RH and is more affected above 66 percent RH. There was no flow above 88 percent RH. Narrower particle size distributions of the angular fluorides allowed flow up to 95 percent RH. These results offer guidance that enhances the commercial potential for this material system.

SUBJECT TERMS:
Coatings; Lubrication; Solid lubricants; Powders; Plasma spray coatings; Relative humidity; Powder flowability; Powder feedstock

NUMBER OF PAGES:
17

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2002/TM-2002-211549.pdf
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