Journal Article

PreJuSER-5592

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Atmospheric plasma spraying of yttria-stabilized zirconia coatings with specific porosity

Mauer, G.FZJ* ; Vaßen, R.FZJ* ; Stöver, D.FZJ*

2009
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.surfcoat.2009.07.017

Abstract: The interdependence between plasma spray process parameters and porosity of YSZ coating microstructures was investigated with simultaneous consideration of the deposition efficiency. Based on a factorial experimental plan, the argon plasma gas flow, the current, the interaction of argon flow and current, and the spray distance for the Triplex H plasma gun were found to yield the main contributions to porosity as well as to deposition efficiency.Each of these three process parameters has a significant individual effect on the in-flight particle velocities and temperatures. The contribution to the effects on porosity arises almost exclusively from the particle temperature. Regarding the deposition efficiency, the larger contribution originates from the particle velocity. To achieve a targeted high porosity at reasonable deposition efficiency a simple linear regression model was applied yielding an argon flow of 50 sIpm and a current of 470A at a spray distance of 200 mm as the optimum parameter set. The average particle temperature estimated for this optimum is just above the melting temperature. At this setting, a porosity of 17.7% and a deposition efficiency of 32.5% may be expected. At a greater spray distance and lower power density (lower current and/or higher argon plasma gas flow) the deposition efficiency was observed to drop considerably. The cooling of the particles here becomes critical, i.e. the particles are only partly molten. This was verified by an analysis of the density distributions of measured in-flight particle temperatures. (C) 2009 Elsevier B.V. All rights reserved.

Keyword(s): J ; Mercury intrusion porosity (MIP) (auto) ; Plasma spraying (auto) ; Oxides (auto)

Note: The authors would like to thank Mrs. Sigrid Schwartz-Luckge and Mrs. Andrea Hilgers for the mercury porosimetry. The cross sections were prepared by Mr. Mark Kappertz, and the SEM images by Dr. Doris Sebold. The photographs of the specimens were kindly taken by Mrs. Hiltrud Moitroux (all Forschungszentrum Julich GmbH, IEF-1).

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEF-1)
2. Jülich-Aachen Research Alliance - Energy (JARA-ENERGY)

Research Program(s):

1. Rationelle Energieumwandlung (P12)

Appears in the scientific report 2009

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