Design of Thermal Barrier Coatings: A Modelling Approach by Mohit Gupta

By Mohit Gupta

This publication info the relationships among microstructure, interface roughness, and homes of thermal barrier coatings. the writer proposes a mode for the aid of the thermal conductivity of the ceramic layer with the intention to elevate the life of thermal barrier coatings. He contains types for the optimization of ceramic layer microstructure and interface roughness.

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Extra resources for Design of Thermal Barrier Coatings: A Modelling Approach

Sample text

3. 5). Due to the Fig. 5 Anelastic response of APS YSZ coating during bilayer curvature measurements [2] 26 3 Characteristics of TBCs difference in CTE between substrate and coating materials, thermal mismatch stresses arise which result in the change of stress state in the coating from compression to tension during heating and then back to compression as the system is cooled down to the start temperature. The non-linear behaviour of the coating during both heating and cooling part of the cycle can be clearly noticed, as well as the hysteresis in the stress–strain curve.

5) where κg0 is the normal (unconstrained) conductivity of the gas at the temperature concerned and B is a constant which depends on the gas type and the properties of the interacting solid surface [6]. 2 Application to TBCs In a real engine environment, TBCs protecting the substrate receive radiation which can be classified into the following two categories—far-field and near-field radiations [9]. 4 shows the temperature distribution across a typical TBC system during service conditions from the hot gases in the combustor to the substrate.

5 Oxide Formation As soon as the TBC is put into operating conditions, the bondcoat starts to undergo oxidation due to the exposure to high temperatures. The YSZ topcoat used typically in a TBC is transparent to oxygen due to two effects: (1) zirconia is transparent to oxygen flow due to the presence of vacancies and (2) the interconnected porosity network present within the topcoat allows free flow of oxygen (air). Therefore, the bondcoat metallic alloy is designed to act as a local aluminium reservoir allowing the formation of slow growing α-alumina which could provide oxidation resistance to the substrate.

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