Abstract No.:
5251

 Scheduled at:
Wednesday, June 07, 2017, Hall 12 11:30 AM
Aviation & Power Generation Industry I


 Title:
Effect of spray parameters on the microstructure and porosity content of gadolinium zirconate TBCs deposited by suspension plasma spray

 Authors:
Satyapal Mahade* / University West, Sweden
Dapeng Zhou/ Institute of Energy and Climate Research (IEK-1), Forschungszentrum Jülich GmbH, Germany
Robert Vaßen/ Institute of Energy and Climate Research (IEK-1), Forschungszentrum Jülich GmbH, Germany

 Abstract:
Gadolinium zirconate (GZ) is considered as a promising top coat candidate for high temperature (>1200°C) thermal barrier coating (TBC) applications. Suspension plasma spray (SPS) technique has shown the capability to generate a wide range of microstructures which includes the more desirable columnar microstructure. In this study, GZ single layer TBCs were deposited by axial SPS process. The variable parameters include the standoff distance, solid load content of the suspension and plasma power. The cross section and top surface of the as sprayed TBCs were analyzed by SEM. The phase content in the as sprayed TBCs was analyzed by XRD. The porosity content of the as sprayed TBCs was measured by employing two methods, namely; image analysis and water intrusion. In the SEM analysis, it was observed that a lower solid load content in the suspension favored the formation of a columnar microstructure with high porosity content in the TBC. Additionally, at a lower solid load content, shorter standoff distance resulted in the reduction of porosity content, although a columnar microstructure was observed. However, at higher solid load content, plasma power alteration had a negligible effect on the microstructure which resembled a dense vertically cracked microstructure

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