Abstract
Turbine entry temperature of turbo-engines has been increased to improve proficiency. Consequently, protecting the hot section elements experiencing aggressive service conditions necessitates the applying of thermal barrier coatings (TBC). Developing TBC systems and improving performance is an ongoing endeavour to prolong the lifetime. Thus, various studies have been conducted to find the optimum properties and dimensions. In this paper, the optimum thickness of intermediate bond coat (BC) and top coat (TC) have been determined via a novel hybrid particle swarm and simulated annealing stochastic optimization method. The optimum thicknesses have been achieved under the constraint of thermal stress induced by thermal fatigue, creep, and oxidation in the TC while minimizing the weight during twenty cycles. The solutions for BC and TC thicknesses are respectively 50 μm and 450 μm. Plane stress condition has been adopted for theoretical and finite element stress analysis, and the results are successfully compared.
Highlights
Increasing firing temperature of gas turbines for satisfying demands in energy supply and transportation systems menace hot section components of the engines like blades [1]
Li et al [10] obtained a proper thermal barrier coatings (TBC) thickness distribution by 3D finite element (FE) analysis and a subsequent weighted-sum approach to solve the optimization problem. They announced that insulation capability and thermal stress level are modified with top coat (TC) thickness increase
Abedi et al [11] examined the effect of different TC and bond coat (BC) thicknesses on microstructural, mechanical, and thermal shock characteristics of a triple layer TBC deposited on a carbonfibre reinforced polyimide matrix composite
Summary
Increasing firing temperature of gas turbines for satisfying demands in energy supply and transportation systems menace hot section components of the engines like blades [1]. Li et al [10] obtained a proper TBC thickness distribution by 3D finite element (FE) analysis and a subsequent weighted-sum approach to solve the optimization problem. They announced that insulation capability and thermal stress level are modified with TC thickness increase. Fang et al [12] investigated the bonding strength of the BC/substrate interface and the oxidation rate of the TGO layer Their observations revealed that the porosity level of the thin coating was smaller than that of the thick one and the pores are larger in the vicinity of the surface. The results were examined in comparison with the other similar paper [5] considering plasticity and temperature loss
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