Effects of sintering and mixed oxide growth on the interface cracking of air-plasma-sprayed thermal barrier coating system at high temperature

Effects of sintering and mixed oxide growth on the interface cracking of air-plasma-sprayed... 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 [4], http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Surface Science Elsevier

Effects of sintering and mixed oxide growth on the interface cracking of air-plasma-sprayed thermal barrier coating system at high temperature

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier B.V.
ISSN
0169-4332
eISSN
1873-5584
D.O.I.
10.1016/j.apsusc.2015.10.037
Publisher site
See Article on Publisher Site

Abstract

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 [4],

Journal

Applied Surface ScienceElsevier

Published: Jan 1, 2016

References

  • Sintering crystalline solids. I. Intermediate and final state diffusion models
    Coble, R.L.
  • A brick model for asperity sintering and creep of APS TBCs
    Cocks, A.; Fleck, N.; Lampenscherf, S.
  • Effects of geometrical and material parameters of top and bond coats on the interfacial fracture in thermal barrier coating system
    Xu, R.; Fan, X.; Zhang, W.; Song, Y.; Wang, T.J.
  • Modelling of TBC system failure: stress distribution as a function of TGO thickness and thermal expansion mismatch
    Martena, M.; Botto, D.; Fino, P.; Sabbadini, S.; Gola, M.; Badini, C.
  • Three-dimensional micromechanical modeling of voided polymeric materials
    Danielsson, M.; Parks, D.; Boyce, M.
  • The surface cracking behavior in air plasma sprayed thermal barrier coating system incorporating interface roughness effect
    Zhang, W.X.; Fan, X.L.; Wang, T.J.

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