Seminar Series - Thermal Spray Nanocomposite Coatings: Industrial Perspective
7. 6. 2023, 14:00 - 15:00
CEITEC Vysoké učení technické v Brně, Large meeting room S2.02
Dr. Sisir Matry FIE
University of Nottingham, United Kingdom
Thermal barrier coatings (TBC) are essential elements of gas turbine engine design since they protect the hot section components. They not only enhance the life of these components but there is a growing demand on these coatings for increasing turbine entry temperature that in turn will improve thermal efficiency. Yttria Stabilized Zirconia is being used as most conventional TBC material for last four decades and have attracted the research community due to its good thermal, mechanical and tribological characteristics. Plasma-sprayed YSZ coatings with tetragonal prime (t') structure is one of the most commonly used thermal barrier coatings (TBC) because of its low thermal conductivity and phase stability at operating temperatures below 1200°C.
Thermal spray coatings have found immense application, both in aviation and automotive sector, owing to the intense research that has gone into this area for the past two decades. The present work has been aimed at developing a microstructure in which combined effect of nanostructure and doping of rare earth oxides such as La2O3, CeO2, La2Zr2O7 and La2Ce2O7 on microstructure, mechanical, thermal and tribological properties.
Degradation of microstructure happens at high temperatures due to Calcium Magnesium Alumino Silicates (CMAS) melts and percolates through TBC and hence degrades structure. Hence This calls for designing material with high temperature stability which can not only surpass the temperature threshold of 1200 ºC for long periods but also be able to mitigate CMAS attack.