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Coatings 2015, 5(3), 338-356; doi:10.3390/coatings5030338

Performance Testing of Suspension Plasma Sprayed Thermal Barrier Coatings Produced with Varied Suspension Parameters

1
Treibacher Industrie AG, Althofen 9330, Austria
2
Progressive Surface, Grand Rapids, MI 49512, USA
3
University West, Gustava Melins Gata 2, Trollhattan 461 86, Sweden
*
Author to whom correspondence should be addressed.
Received: 17 June 2015 / Revised: 20 July 2015 / Accepted: 22 July 2015 / Published: 24 July 2015
(This article belongs to the Special Issue High Temperature Coatings)
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Abstract

Suspension plasma spraying has become an emerging technology for the production of thermal barrier coatings for the gas turbine industry. Presently, though commercial systems for coating production are available, coatings remain in the development stage. Suitable suspension parameters for coating production remain an outstanding question and the influence of suspension properties on the final coatings is not well known. For this study, a number of suspensions were produced with varied solid loadings, powder size distributions and solvents. Suspensions were sprayed onto superalloy substrates coated with high velocity air fuel (HVAF) -sprayed bond coats. Plasma spray parameters were selected to generate columnar structures based on previous experiments and were maintained at constant to discover the influence of the suspension behavior on coating microstructures. Testing of the produced thermal barrier coating (TBC) systems has included thermal cyclic fatigue testing and thermal conductivity analysis. Pore size distribution has been characterized by mercury infiltration porosimetry. Results show a strong influence of suspension viscosity and surface tension on the microstructure of the produced coatings. View Full-Text
Keywords: thermal barrier coating; suspension plasma spray; columnar coating; suspension viscosity; thermo-cyclic fatigue; thermal conductivity thermal barrier coating; suspension plasma spray; columnar coating; suspension viscosity; thermo-cyclic fatigue; thermal conductivity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Curry, N.; VanEvery, K.; Snyder, T.; Susnjar, J.; Bjorklund, S. Performance Testing of Suspension Plasma Sprayed Thermal Barrier Coatings Produced with Varied Suspension Parameters. Coatings 2015, 5, 338-356.

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