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The Development of Dense Plasma Sprayed yttria Coatings on Graphite

Published online by Cambridge University Press:  21 February 2011

P. Diez ,
R. Smith ,
D. Apelian ,
R. Faron  and
G. Regazzoni
P. Diez
Affiliation:
Drexel university, Philadelphia, PA, USA. Uranium Pechiney, Paris-La Défense, France.
R. Smith
Affiliation:
Drexel university, Philadelphia, PA, USA.
D. Apelian
Affiliation:
Drexel university, Philadelphia, PA, USA.
R. Faron
Affiliation:
Uranium Pechiney, Paris-La Défense, France.
G. Regazzoni
Affiliation:
Centre de recherches de Voreppe, Voreppe, France.
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Abstract

Plasma spraying of two yttria powders with different morphology (agglomerated and porous vs fused and dense) was investigated. Coatings were produced on steel and TZM (Ti-Zr-Mo alloy) substrates. Coatings microstructure, both degree of melting of particles and coating density, were measured by metallographic techniques and successfully related to plasma processing parameters. Microstructure were explained by particles behavior in the plasma jet. Yttria coatings were deposited on graphite using molybdenum as an interlayer to match thermal expansion differences and interfaces have been characterized by SEM observation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 190: Symposium M – Plasma Processing and Synthesis of Materials III , 1990 , 55
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

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