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Plasma Sprayed Alumina-Titania Coatings

Published online by Cambridge University Press:  25 February 2011

T. J. Steeper ,
A. J. Rotolico ,
J. E. Nerz ,
W. L. Riggs II ,
D. J. Varacalle Jr  and
G. C. Wilson
T. J. Steeper
Affiliation:
Savannah River Laboratory, Aiken, SC
A. J. Rotolico
Affiliation:
Metco/Perkin-Elmer, Westbury, NY
J. E. Nerz
Affiliation:
Metco/Perkin-Elmer, Westbury, NY
W. L. Riggs II
Affiliation:
TubalCain Company, Loveland, OH
D. J. Varacalle Jr
Affiliation:
ldaho National Engineering Laboratory, EG&G Idaho, Inc., Idaho Falls, ID
G. C. Wilson
Affiliation:
ldaho National Engineering Laboratory, EG&G Idaho, Inc., Idaho Falls, ID
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Abstract

This paper presents an experimental study of the air plasma spraying (APS) of alumina-titania powder using argon-hydrogen working gases. This powder system is being used in the fabrication of heater tubes that emulate nuclear fuel tubes for use in thermal-hydraulic testing. Experiments were conducted using a Taguchi fractional-factorial design parametric study. Operating parameters were varied around the typical spray parameters in a systematic design of experiments in order to display the range of plasma processing conditions and their effect on the resultant coatings. The coatings were characterized by hardness and electrical tests, surface profilometry, image analysis, optical metallography, and x-ray diffraction. Coating qualities are discussed with respect to dielectric strength, hardness, porosity, surface roughness, deposition efficiency, and microstructure. Attempts are made to correlate the features of the coatings with the changes in operating parameters.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 271: Symposium N – Better Ceramics Through Chemistry V , 1992 , 485
Copyright
Copyright © Materials Research Society 1992

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References

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