By Mohit Gupta
This publication information the relationships among microstructure, interface roughness, and houses of thermal barrier coatings. the writer proposes a mode for the relief of the thermal conductivity of the ceramic layer so that it will 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 info for Design of Thermal Barrier Coatings: A Modelling Approach
Sevostianov et al.  developed a model which gave an explicit relation between the anisotropic thermal conductivities and the microstructure parameters of plasma- sprayed TBCs. The microstructure was assumed to be composed of two families of penny-shaped cracks—horizontal and vertical. The orientational scatter was also accounted for in the model by an appropriate orientation distribution function. The effective conductivity was dependent mainly on the crack densities and their orientational scatters, and the overall porosity (P) played only a secondary role .
Analytical models have also been developed which explain this behaviour [16, 18]. Similar behaviour in tension and compression was assumed in these models. The evaluation of modulus provides indication of the coating integrity, porosity and bonding quality between splats. It also provides an idea of the thermal stress developed in the coating during operation since the modulus is roughly proportional to the induced thermal stresses . 3 Non-linear Properties Recent developments have shown that ceramic coatings exhibit anelastic mechanical response [20, 21].
Both TCF and thermal shock testing methods have their own limitations. TCF tests have the benefit that they provide information about sintering of topcoat, TGO growth in TBC system and the topcoat’s ability to sustain the induced stresses due to TGO growth and thermal mismatch. In this way, results obtained from TCF tests 40 4 Experimental Methods Fig. 5 Topcoat–bondcoat interface after failure showing the TGO growth are highly dependent on the bondcoat material and structure. The major limitation of TCF tests is the time taken for the tests to be completed, since it can take more than a month to obtain lifetime results.
Design of Thermal Barrier Coatings: A Modelling Approach by Mohit Gupta