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Cyclic Oxidation of Combined LTA/YSZ and Alumina Thermal Spray Coatings

Cyclic Oxidation of Combined LTA/YSZ and Alumina Thermal Spray Coatings
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Author(s): Pritee Deshpande-Purohit (Army Institute of Technology, India), Shashikant Vagge (College of Engineering, Pune, India) and Bhavana Shrigadi (Cummins India Ltd., Pune, India)
Copyright: 2021
Pages: 17
Source title: Advanced Surface Coating Techniques for Modern Industrial Applications
Source Author(s)/Editor(s): Supriyo Roy (Haldia Institute of Technology, India) and Goutam Kumar Bose (Haldia Institute of Technology, India)
DOI: 10.4018/978-1-7998-4870-7.ch003

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Abstract

Thermal barrier coatings protect the substrate from thermal diffusion, oxidation, phase transformations, elastic deformation, plastic deformation, creep deformation, thermal expansion, thermal radiation. It allows parts and components of gas turbines to withstand high temperature upto1650 °C. Cylic oxidation behavior of alumina incorporated, lanthanum titanium aluminum oxide (LaTi2Al9O19), and yttria stabilized zirconia (YSZ), that is LTA/YSZ top ceramic layer coating, was investigated. Two coating combinations, L 100 having top LTA layer thickness of 100 µm and L 150 having top layer of LTA having thickness 150 µm, were tested for thermal cycles at the temperature of 1100°C. The performances of these coatings were compared with conventional YSZ coatings. Microstructure studies, EDX, and XRD analysis demonstrated the formation of mainly LTA, LaAlO3, Al2TiO5, Al2O3, and TiO2 at 1100°C in both coatings. But in L 150 coating, the rate of oxidation was found slower than L 100 coating. Annealed L 150A and L 100A specimens show cyclic oxidation life of 272th and 250th cycles, respectively.

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