Article history: Sintering and mixed oxide (MO) growth signiﬁcantly affect the thermal and mechanical properties of Received 9 August 2015 thermal barrier coating system (TBCs) in gas turbine at high temperature. In this work, we numerically Received in revised form analyzed the effects of sintering and MO growth on the interface cracking of TBCs. A thermal-elasto- 29 September 2015 viscoplastic constitutive model was introduced, in which the effect of sintering was studied using a Accepted 6 October 2015 spherical shell model. Based on the same spherical shell model and our previous experimental observa- Available online 9 October 2015 tions, we theoretically derived the evolution of relative density and applied this constitutive model to the sintering of ceramic coating. The numerical results showed that viscosity, initial porosity of ceramic Keywords: and the growth rate of MO had signiﬁcant effects on interface cracking. In contrast, the inﬂuence of ini- Thermal barrier coating tial pore size of ceramic coating was neglectable. Suggestions were also made for the choice of material Sintering during TBCs design. Mixed oxide Interface crack © 2015 Elsevier B.V. All rights reserved. Constitutive model Finite element method 1. Introduction accompanying with macroscopic volumetric shrinkage. According to Coble’s deﬁnition ,
Applied Surface Science – Elsevier
Published: Jan 1, 2016
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