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NUMERICAL APPROACH TO MICROSTRUCTURAL CHARACTERIZATIONS FOR DENSE AND POROUS THERMAL BARRIER COATINGS

  • Kim, Seok-Chan (DEPARTMENT OF MATHEMATICS, CHANGWON NATIONAL UNIVEISIRY) ;
  • Go, Jae-Gwi (SCHOOL OF NANO AND ADVANCED MATERIALS ENGINEERING, CHANGWON NATIONAL UNIVEISIRY) ;
  • Jung, Yeon-Gil (SCHOOL OF NANO AND ADVANCED MATERIALS ENGINEERING, CHANGWON NATIONAL UNIVEISIRY) ;
  • Paik, Un-Gyu (DEPARTMENT OF ENERGY ENGINEERING, HANYANG UNIVERSITY)
  • Received : 2011.05.17
  • Accepted : 2011.09.05
  • Published : 2011.09.23

Abstract

During spray coating, especially in an air plasma spray (APS), pores, cracks, and splat boundaries are developed and those factors exert influence on thermomechanical properties such as elastic modulus, thermal conductivity, and coefficient of thermal expansion. Moreover, the thermo mechanical properties are crucial elements to determine the thermoelastic characteristics, for instance, temperature distribution, displacements, and stresses. Two types of thermal barrier coating (TBC) model, the dense and porous microstructures, are taken into account for the analysis of microstructural characterizations. $TriplexPro^{TM}$-200 system was applied to prepare TBC samples, and the METECO 204 C-NS powder is adopted for the relatively porous microstructure and METECO 204 NS powder for the dense microstructure in the top coat of TBCs. Governing partial differential equations were derived based on the thermoelastic theory and approximate estimates for the thermoelastic characteristics were obtained using a finite volume method for the governing equations.

Acknowledgement

Supported by : NRF, KETEP

References

  1. F. Cernuschi, P. Bison, and A. Moscatelli, Microstructural characterization of porous thermal barrier coatings by laser flash technique 57 (2009), 3460-3471, Acta Materials https://doi.org/10.1016/j.actamat.2009.03.041
  2. K.D. Harris, D. Vick, E.J. Gonzalez, T. Smy, K. Robbie, and M.J. Brett, Porous thin films for thermal barrier coatings 138 (2001),185-191, Surface and Coatings Technology https://doi.org/10.1016/S0257-8972(00)01155-5
  3. M. Tadi, Finite Volume Mehod for 2D Elastic Wave Prooagation, 94 (2004),1500-1509, Bulletin of the Seismological Society of America, https://doi.org/10.1785/012003138
  4. N. Zotov, M. Bartsch, L. Chernova, D.A. Schmidt, M. Havenith, and G. Eggeler, Effects of annealing on the microstructure and the mechanical properties of EB-PVD thermal barrier coatings, 15 (2010), 452-464, Surface and Coatings Technology
  5. P. Roy, G. Bertrand, and C. Coddet, Spray drying and sintering of zirconia based hollow powders 157 (2005), 20-26, Powder Technol. https://doi.org/10.1016/j.powtec.2005.05.031
  6. S.-I. Jung, J.-H. Kim, J.-H. Lee, Y.-G. Jung, U. Paik, and K.-S. Lee, Microstructure and mechanical properties of zirconia-based thermal barrier coatings with starting powder morphology 204 (2009), 802-806, Surface and Coatings Technology https://doi.org/10.1016/j.surfcoat.2009.09.070