Ghai, Ramandeep SinghChen, KuiyingBaddour, Natalie2018-11-092018-11-09May-18978-1-77355-023-7http://hdl.handle.net/10315/35380http://dx.doi.org/10.25071/10315/35380Thermal Barrier Coatings (TBC) are used to shield hot sections of gas turbine engines, helping to prevent the melting of metallic surfaces. This paper proposes a Five-phase model to calculate the effective thermal conductivity of a TBC, taking into consideration the effect of various defects. By comparing the predicted values with experimental results, it was shown that the proposed five-phase model can predict the thermal conductivity of ceramic coatings closer to the actual values.enThe copyright for the paper content remains with the authors.Materials TechnologyTBCThermal conductivityHigh-temperature coatingsModellingPorosity and defectsArticle