A study on the numerical simulation of thermo-mechanical behavior of the novel functionally graded thermal barrier coating under thermal shock

Subject Areas : Mechanical Engineering

N.  Nayebpashaee ¹ (Department of Material & Metallurgy Engineering, Iran University of Science and Technology)
H.  Vafaeenezhad ² (Department of Material & Metallurgy Engineering, Iran University of Science and Technology)
S. M. M.  Hadavi ³ (Department of Material & Metalurgy Engineering, Malek Ashtar University of Technology)
S. H.  Seyedein ⁴ (Department of Material & Metallurgy Engineering, Iran University of Science and Technology)
M. R.  Aboutalebi ⁵ (Department of Material & Metallurgy Engineering, Iran University of Science and Technology)
H.  Sarpoolaky ⁶ (Department of Material & Metallurgy Engineering, Iran University of Science and Technology)

Received: 2014-12-19 Accepted : 2015-03-20 Published : 2015-06-01

Keywords: thermal barrier coating, Residual stress, Finite Element Simulation, Thermal Shock,

Abstract :

An attempt was made to investigate the thermal and residual stress distribution in a novel three layer (La2Zr2O7/8YSZ/NiCrAlY) during a real-like heating regime which includes heating, service time and final cooling. For achieving maximum accuracy and consistency in calculation of thermal and mechanical properties of hybrid coating system, all related and required properties were introduced to the software in temperature-dependent mode. Element modification approaches like mass scaling leads to a considerable reduction in running time while satisfying and not violating accuracy and converging criteria and constrains. Applying adaptive hybrid meshing techniques which applies both mesh–part dependency and independency during numerical iterative solution avoids element distortion and diverging in coupled problem. Heat flux and nodal temperature contours indicated that, most of damaging and harmful thermal load and residual stresses concentrate on ceramic top coats and this may lead less harm and life time reduction in the substrate.

References:

[1]      Saeedi, B., Sabour, A., Ebadi, A., and Khoddami, A. M., “Influence of the Thermal Barrier Coatings Design on the Oxidation Behavior”, J. Mater. Sci. Technol., Vol.25, No.4, 2009, pp. 499-507.

[2]      Di Girolamo, G., Blasi, C., Brentari, A., and Schioppa, M., “Microstructure and thermal properties of plasma-sprayed ceramic thermal barrier coatings”, Studi & ricerche, Research papers, 2013.

[3]      Khor, K. A., “Thermal properties of plasma-sprayed functionally graded thermal barrier coatings”, Thin Solid Films, Vol. 372, No.1-2, 2000, pp. 104-113.

[4]      Wang, L., Wang, Y., Sun, X. G., He, J. Q., Pan, Z. Y., and Wang, C.H., “Microstructure and indentation mechanical properties of plasma sprayed nano-bimodal and conventional ZrO₂-8wt%Y₂O₃ thermal barrier coatings”, Vacuum, Vol. 86, No. 8, 2012, pp. 1174-1185.

[5]      Vaßen, R., Ophelia Jarligo, M., Steinke, T., Emil Mack, D., and Stöver, D., “Overview on advanced thermal barrier coatings”, Surface & Coatings Technology, Vol. 205, No.4, 2010, pp. 938-942.

[6]      Baig, M. N.,.Khalid, F. A,.Khan, F. N, and  Rehman, K., “Properties and residual stress distribution of plasma sprayed magnesia stabilized zirconia thermal barrier coatings”, Ceramics International, Vol. 40, No. 3, 2014, pp. 4853-4868.

[7]      Wang, L., Wang, Y., Sun, X. G, He, .J. Q., Pan, Z.Y., and Wang, C. H., “Thermal shock behavior of 8YSZ and double-ceramic-layer La₂Zr₂O₇/8YSZ thermal barrier coatings fabricated by atmospheric plasma spraying”, Ceramics International, Vol. 38, No.5, 2012, pp. 3595-3606. .

[8]      Wang, L., Wang, Y., Zhang, W. Q., Sun, X. G., He, Z. Y. Pan, and Wang, C. H., “Finite element simulation of stress distribution and development in 8YSZ and double-ceramic-layer La2Zr2O7/8YSZ thermal barrier coatings during thermal shock”, Applied Surface Science, Vol. 258, No.8, 2012, pp. 3540- 3551.

[9]      Matsumoto, M., Aoyama, K., Matsubara, H., Takayama, K., Banno, T., Kagiya, Y., and Sugita, Y., “Thermal conductivity and phase stability of plasma sprayed ZrO₂–Y₂O₃–La₂O₃ coatings”, Surface & Coatings Technology, Vol. 194, No. 1, 2005, pp. 31-35.

[10]   NAGA, S. M., “Ceramic matrix composite thermal barrier coatings for turbine parts”, In book: Advances in Ceramic Matrix Composites., Edition: 1, Chapter: 21, Publisher: Woodhead Publishing Limited, Editors: I.M. Low, pp.524-533.

[11]   Khoddami, A. M., Sabour, A., Hadavi, S. M. M., “Microstructure formation in thermally-sprayed duplex and functionally graded NiCrAlY/Yttria-Stabilized Zirconia coatings”, Surface & Coatings Technology, Vol. 201, No.12, 2007, pp. 6019–6024.

[12]   Mahamood, R. M., Akinlabi Member, E. T., IAENG, M. Shuklav, and Pityana, S, “Functionally Graded Material: An Overview”, Proceedings of the World Congress on Engineering, 2012(WCE 2012, July 4 - 6, 2012, London, U.K.).

[13]   Kieback, B., Neubrand, A., and Riedel, H., “Processing techniques for functionally graded materials”, Materials Science and Engineering A, Vol.362, No. 1-2, 2003, pp. 81–105.

[14]   Watremetz, B., Baietto-Dubourg, M. C., and Lubrecht, A. A., “2D thermo-mechanical contact simulations in a functionally graded material: A multigrid-based approach”, Tribology International, Vol. 40, 2007, pp. 754–762.

[15]   Jha, D. K., Kant, T., and Singh, R. K, “A critical review of recent research on functionally graded plates”, Composite Structures, Vol. 96, 2013, pp. 833-849.

[16]   Lee W. Y, Stinton, D. P., “Concept of Functionally Graded Materials for Advanced Thermal Barrier Coating Applications”, Journal of the American Ceramic Society, Vol. 79, No. 12, 1996, pp. 3003-3012.

[17]   Helwany, S., “Applied Soil Mechanics with ABAQUS Applications”, John Wiley & Sons; 1 edition, 2007.