Comparative Study On The Synthesis And Properties Of Yttria Stabilized Zirconia (YSZ) And Lanthana Doped YSZ Plasma Sprayed Thermal barrier coatings

Aruna, ST and Balaji, N and Paligan, AA (2013) Comparative Study On The Synthesis And Properties Of Yttria Stabilized Zirconia (YSZ) And Lanthana Doped YSZ Plasma Sprayed Thermal barrier coatings. In: Proceedings of the ASME 2013 Gas Turbine India Conference (GTINDIA2013), 5-6 Dec 2013, Bangalore, Karnataka, India.

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Abstract

Ceramic thermal barrier coatings (TBCs) have been used for decades to extend the life of combustors and high turbine stationary and rotating components. By using TBCs, one can increase the operating temperature and in turn the performance of gas turbines or diesel engines can be increased. At present, thermal barrier coatings (TBCs) of Y2O3 partially stabilized ZrO2 (YPSZ) films are widely used to protect hot section parts of aircraft and land-based turbines for reducing the temperature of metal substrates. Currently, state-of-the art TBCs are based on 7-8 wt% YSZ and in recent years ceramic compositions useful in thermal barrier coatings having reduced thermal conductivity are being explored. In the present study, 8wt% yttria stabilized zirconia (YSZ) and lanthana doped YSZ plasma sprayable powders were prepared in the laboratory by a single step precipitation method and characterized. Both the powders had good flowability. These powders were plasma sprayed at three different critical plasma spray parameters. The coatings were characterized for phase, microstructure, wear resistance and thermal conductivity. Microstructure of the coatings showed that coatings had good adherence to the substrate. Plasma sprayed 8wt% YSZ and lanthana doped YSZ exhibited thermal conductivity values of 0.88 and 0.67 W m-1 K-1 respectively. This study shows that lanthana doping in YSZ helps in lowering the thermal conductivity and hence this coating may be a potential candidate for TBC application.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Ceramic thermal barrier coatings (TBCs);Plasma spray; Microstructure;Wear resistance;Thermal conductivity values; Thermal barrier coatings
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 18 Aug 2015 07:27
Last Modified: 18 Aug 2015 07:27
URI: http://nal-ir.nal.res.in/id/eprint/12302

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