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 so one can raise the life of thermal barrier coatings. He comprises types for the optimization of ceramic layer microstructure and interface roughness.

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

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At low temperatures, the electrons are mainly scattered by the defects, while as the temperature increases, the scattering mechanism by the phonons becomes more and more dominant. Therefore, the electronic component of thermal conductivity is proportional to temperature at low temperatures, becoming less dependent as temperature increases, and finally becoming independent of it at high temperatures [8]. Lattice thermal conduction, or heat energy transport by phonons, occurs in all types of solids, with the phenomenon being dominant in alloys at low temperatures and in ceramics.

Examples include acoustic emission techniques [10]. 3. Pulse-echo methods: These techniques are based on the principle that the velocity of sound in a material depends on the elastic modulus of the material. Examples include laser-induced ultrasonic techniques [11]. It has been observed in earlier work that the modulus value depends highly on the technique used to evaluate it and it could be different even if the test specimens are identical between different techniques [12]. This effect, which is related to the local variations of the microstructure within the coating, could be explained by the scale of the testing technique which ranges from microscopic (nanoindentation) to mesoscopic (micro-indentation) and macroscopic (bending tests, ultrasonic testing) dimensions [12].

Other factors which could affect the image analysis results are threshold level, microscope effects (such as image brightness and contrast and operating mode) and coating location where the image has been taken [6]. 2 Thermal Conductivity Measurements The most widely accepted method for evaluating thermal conductivity of TBCs is laser flash analysis (LFA) technique [7]. 1. © The Author(s) 2015 M. 1007/978-3-319-17254-5_4 33 4 Experimental Methods 34 Fig. 1 The laser flash analysis apparatus used for measuring thermal conductivity (Courtesy of NETZSCH, Germany) In this method, a laser pulse is shot at the substrate face of the sample and the resulting temperature increase is measured at the other face of the sample with an infrared detector.

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