Influence of Single Layer-Thickness on Residual Thermal Stresses in Sm₂Zr₂O₇/YSZ Thermal Barrier Coatings

Abstract:

In this paper, influence of single-layer thickness on residual stresses in Sm2Zr2O7/YSZ thermal barrier coating was analyzed by finite element method. Results show that the radial stress remains stable in x range 0-12mm, and it decreases abruptly at edge of the sample. The distribution of axial stress resembles that of radial stress, the shear stress increase abruptly at edge of sample. In three typical residual stresses, radial stress has the highest value, axial stress and shear stress can be ignored. The best thickness combination of Sm2Zr2O7/YSZ TBCs should be 0.1mm-NiCoCrAlY layer, 0.05-0.1mm -TGO, 0.1mm-YSZ and 0.9mm-Sm2Zr2O7

• Periodical: Key Engineering Materials (Volume 537)
• Pages: 97-100
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.537.97
• Online since: January 2013
• Authors: Ren Xi Hu, Xiao Ge Chen, Gang Li
• Keywords: Finite Element, Layer Thickness, Residual Thermal Stresses, Thermal Barrier Coating (TBC)

References

[1] R. Vaben, M. O. Jarligo, T. Steinke, et al, Overview on advanced thermal barrier coatings, Surf. Coat. Technol, 145 (2010) 938-942.

[2] H. S. Zhang, S. R. Liao, X. D. Dang, et al, Preparation and thermal conductivities of Gd2Ce2O7 and (Gd0.9Ca0.1)2Ce2O6.9 ceramics for thermal barrier coatings, J. Alloys Compds. 509 (2011) 1226 -1230.

DOI: 10.1016/j.jallcom.2010.09.196

[3] L. Ling, X. Qiang, W. F. Chi, Z. H. Song, Thermophysical Properties of Complex Rare-Earth Zirconate Ceramic for Thermal Barrier Coatings, J. Amer. Ceram. Soc. 91 (2008) 2398-2401.

DOI: 10.1111/j.1551-2916.2008.02433.x

[4] Z. H. Song, X. Qiang, W. F. Chi, et al, Preparation and thermophysical properties of (Sm0.5La0.5)2 Zr2O7 and (Sm0.5La0.5)2(Zr0.8Ce0.2)2O7 ceramics for thermal barrier coatings, J. Alloys. Compds. 475 (2009) 624-628

DOI: 10.1016/j.jallcom.2008.07.068

[5] Z. G. Liu, J. H. Ouyang, Y. Zhou, Preparation and thermophysical properties of (NdxGd1-x)2Zr2O7 ceramics, J. Mater. Sci. 43 (2008) 3596-3603.

DOI: 10.1007/s10853-008-2570-9

[6] G. Moskal, L. Swadzba, M. Hetmanczky, et al, Characterisation of the micro-structure and thermal properties of Nd2Zr2O7 and Nd2Zr2O7/YSZ thermal barrier coatings, J. Eur. Ceram. Soc.32 (2012) 2035-2042.

DOI: 10.1016/j.jeurceramsoc.2011.12.004

[7] L. Wang, Y. Wang, X. G. Sun, et al, Finite element simulation of residual stress of double- ceramic-layer La2Zr2O7/8YSZ thermal barrier coatings using birth and death element technique, Comput. Mater. Sci. 53 (2012) 117-127.

DOI: 10.1016/j.commatsci.2011.09.028

[8] Z. H. Xu, S. M. Hei, L. M. He, et al, Novel thermal barrier coatings based on La2(Zr0.7Ce0.3)2O7/ 8YSZ double-ceramic-layer system deposited by electron beam physical vapor deposition, J. Alloys Compd. 509 (2011) 4273-4283.

DOI: 10.1016/j.jallcom.2010.12.203

[9] X. Q. Cao, R. Vassen, F. Tietz, D. Stoever, New double-ceramic-layer thermal barrier coatings based on zirconia-rare earth composite oxides, J. Eur. Ceram. Soc. 26 (2006) 247-251.

DOI: 10.1016/j.jeurceramsoc.2004.11.007

[10] Y. Jiang, B. S. Xu, H. D. Wang, et al, Finite element modeling of residual stress around hole in the thermal barrier coatings, Comp. Mater. Sci. 49 (2010) 603-608.

DOI: 10.1016/j.commatsci.2010.05.057

[11] N. P. Padture, M. Gell, E. H. Jordan, Thermal barrier coatings for gas-turbine engine applications, Sci. 4 (2002) 280-284.

DOI: 10.1126/science.1068609