Residual stress of thermal barrier coatings (TBCs) is investigated by experiment and numerical method. Thermal barrier coatings, which consist of CoCrAlY bond coating (BC) and ZrO2 thermat ceramic coating (TCC) are fabricated on the GH99 superalloy by air plasma spray (APS). Meanwhile, residual stress in TBCs during the cooling process is measured by 100-3 500 cm-1 Raman spectroscopy and simulated using finite element method (FEM). The distributions of vertical stresses are analyzed; meanwhile, the results of Raman shift and numerical simulation are compared. The results show that in the vertical direction, there appears compressive stress in TCC, and to the interface of TCC/BC there shows the maximum compressive stress, 14.8 MPa. There appears tensile stress in BC. The results of the simulation are consistent with experimental measurements obtained with micro-Raman spectroscopy.
HAN Zhiyong, ZHANG Hua, WANG Zhiping
. Study of Residual Stress of Thermal Barrier Coatings by Raman Spectroscopy and Numerical Analysis[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2012
, 33(2)
: 369
-374
.
DOI: CNKI:11-1929/V.20111202.1032.006
[1] Sheffler K D, Gupta D K. Current status and future trends in turbine application of thermal barrier coatings. Journal of Engineering for Gas Turbines and Power, 1988, 110(4): 605-609.
[2] Jian C Y. Study on evaluation method of ceramic coating system for gas turbine rotator blades. Tohoku: Tohoku University, 1996.
[3] Padture N T, Gell M, Jordan E H. Thermal barrier coaings for gas turbine engine applications. Science, 2003, 296(5566): 280-284.
[4] Miller R A. Thermal barrier coatings for aircraft engines: history and directions. Journal of Thermal Spray Technology, 1997, 6(1): 35-42.
[5] Cao X Q, Vassen R, Stoever D. Ceramic materials for thermal barrier coatings. Journal of the European Ceramic Society, 2004, 24(1): 1-10.
[6] Trunova O, Beck T, Herzog R, et al. Damage mechanisms and lifetime behavior of plasma sprayed thermal barrier coating systems for gas turbines. Surface and Coatings Technology, 2008, 202(24): 5027-5032.
[7] Khan A N, Lu J, Liao H. Effect of residual stress on air plasma sprayed thermal barrier coatings. Surface and Coatings Technology, 2003, 168(23): 291-299.
[8] Taylor R, Brandon J R, Morrell P. Microstructure composition and property relationships of plasma sprayed thermal barrier coatings. Surface and Coatings Technology, 1992, 50(2): 141-149.
[9] Cai J, Raptis Y S, Anastassakis E. Stabilized cubic zirconia: A Raman study under uniaxial stress. Applied Physics Letters, 1993, 62(22): 2781-2783.
[10] Tomimatsu T, Kagawa Y, Zhu S J. Residual stress distribution in electron beam-physical vapor deposited ZrO2 thermal barrier coating layer by Raman spectroscopy. Metallurgical and Materials Transactions A, 2003, 34(8): 1739-1741.
[11] Tanaka M, Hasegawa M. Measurement of residual stress in air plasma-sprayed Y2O3-ZrO2 thermal barrier coating system using micro-Raman spectroscopy. Materials Science and Engineering A, 2006, 419(1-2): 262-268.
[12] Brandmuller J, Keifer W. Fifty years of Raman spectroscopy spex speaker. Physics View, 1978, 233(2): 10-12.
[13] Ma Q, Clarke D R. Stress measurement in single and polycrystalline ceramics using their optical fluorescence. Journal of the American Ceramic Society, 1993, 76(6): 1433-1440.
[14] Bialas M. Finite element analysis of stress distribution in thermal barrier coatings. Surface and Coatings Technology, 2008, 202(24): 6002-6010.
[15] Teixeira V. Numerical analysis of the influence of coating porosity and substrate elastic properties on the residual stresses in high temperature graded coatings. Surface and Coatings Technology, 2001, 79(2): 146-147.
[16] Russell M B, Probert S D. FDiff3: a ?nite-difference solver for facilitating understanding of heat conduction and numerical analysis. Applied Energy, 2004, 79(4): 443-456.
[17] Busso P, Evans H E, Wright L, et al. A software tool for lifetime prediction of thermal barrier coating systems. Materials and Corrosion, 2008, 59(7): 556-565.
[18] DeMasi J T, Ortiz M, Sheffler K D. Thermal barrier coating life prediction model development. NASA-CR-182230, 1989.
[19] Bartsch M, Baufeld B, Dalkilic S, et al. Fatigue cracks in a thermal barrier coating system on a superalloy in multi-axial thermomechanical testing. International Journal of Fatigue, 2008, 30(2): 211-218.
[20] Karlsson A M, Xu T, Evans A G. The effect of the thermal barrier coating on the displacement instability in thermal barrier systems. Acta Materialia, 2002, 50(6): 1211-1218.
[21] McCarthy C T, McCarthy M A, Lawlor V P, et al. Progressive damage analysis of multi-bolt composite joints with variable bolt-hole clearances. Composites Part B: Engineering, 2005, 36(4): 290-305.