• SALMI MOHD YUNUS TNB Research Sdn Bhd


Thermal Barrier Coating, Lanthanum Zirconate (LZO), isothermal oxidation, adhesion strength


Investigation on the effect of Thermally Grown Oxides (TGO) on the adhesion strength for thermal barrier coating (TBC) was carried out. The TBC under studied was the multilayer systems which consist of NiCrAlY bond coat and YSZ/LZO ceramic coating deposited on Ni-based superalloy substrates. The development of Thermally Grown Oxides (TGO) for both TBC systems after isothermal oxidation was measured. Isothermal oxidation was carried out at 1100 °C for 100 hours to age the samples. ASTM D4541: Standard Test Method for Pull-off Strength of Coatings using Portable Adhesion Tester was used to measure the adhesion strength of both TBC systems before and being aged. The effect of the developed TGO on the measured adhesion strength was examined and correlation between them was established individually for both TBC systems. The failure mechanism of the both system was also has been identified; either cohesive or adhesive or the combination of both. The results showed that TGO has been growth more than 50 % from the bond coat layer for rare-earth LZO system compared to the typical YSZ system, which less than 10 % from the bond coat layer. This leads to the lower adhesion strength of rare-earth LZO coating system compared to typical YSZ system. Failure mechanism during the ASTM test also was found different for both TBC systems. The typical YSZ system experienced cohesive failure whereas the rare-earth LZO system experienced the combination of cohesive and adhesive failure.


Chen, W.R., Archer, R., Huang, X., Marple, B.R. (2008): TGO growth and crack propagation in a thermal barrier coating. – Journal of Thermal Spray Technology 17(5-6): 858.

Clarke, D.R., Oechsner, M., Padture, N.P. (2012): Thermal-barrier coatings for more efficient gas-turbine engines. – MRS bulletin 37(10): 891-898.

Clarke, D.R. (2003): Materials selection guidelines for low thermal conductivity thermal barrier coatings. – Surface and Coatings Technology 163: 67-74.

Dikici, H., Karaoglanli, A.C., Grund, T., Lampke, T., Kucuk, Y. (2012): Effects of Production Method and Heat Treatment on the Adhesion Strength and Microstructural Behavior of MCrAlY Coatings. 13th International Conference on Plasma Surface Engineering 416-419.

Dorfman, M., Stapgens, M., Medrano, J., Sporer, D. (2013): Takeoff with advanced coatings: Improving thermal protection through new material solutions. – Sulzer Tech. Rev 3: 8-12.

Gurrappa, I., Rao, A.S. (2006): Thermal barrier coatings for enhanced efficiency of gas turbine engines. – Surface and Coatings Technology 201(6): 3016-3029.

Karaoglanli, A.C., Ogawa, K., Turk, A., Ozdemir, I. (2013): Thermal shock and cycling behavior of thermal barrier coatings (TBCs) used in gas turbines. – Progress in gas turbine performance 237-260.

Koolloos, M.F.J. (2003): Behaviour of low porosity microcracked thermal barrier coatings under thermal loading. – Eindhoven University of Technology 168p.

Li, C., Zhang, X., Chen, Y., Carr, J., Jacques, S., Behnsen, J., Di Michiel, M., Xiao, P., Cernik, R. (2017): Understanding the residual stress distribution through the thickness of atmosphere plasma sprayed (APS) thermal barrier coatings (TBCs) by high energy synchrotron XRD; digital image correlation (DIC) and image based modelling. – Acta materialia 132:1-12.

Limarga, A.M., Shian, S., Baram, M., Clarke, D.R. (2012): Effect of high-temperature aging on the thermal conductivity of nanocrystalline tetragonal yttria-stabilized zirconia. – Acta Materialia 60(15): 5417-5424.

Liu, Z.G., Zhang, W.H., Ouyang, J.H., Zhou, Y. (2014): Novel double-ceramic-layer (La0. 8Eu0. 2) 2Zr2O7/YSZ thermal barrier coatings deposited by plasma spraying. – Ceramics International 40(7): 11277-11282.

Jiang, P., Fan, X., Sun, Y., Wang, H., Su, L., Wang, T. (2018): Thermal‐cycle dependent residual stress within the crack‐susceptible zone in thermal barrier coating system. – Journal of the American Ceramic Society 101(9): 4256-4261.

Ogawa, K. (2015): High temperature oxidation behavior of thermal barrier coatings. – Materials, Modeling and Performance 103-127.

Ramachandran, C.S., Balasubramanian, V., Ananthapadmanabhan, P.V., Viswabaskaran, V. (2012): Influence of the intermixed interfacial layers on the thermal cycling behaviour of atmospheric plasma sprayed lanthanum zirconate based coatings. – Ceramics International 38(5): 4081-4096.

Xiang, J., Shuhai, C.H.E.N., Huang, J., Liang, W., Yanjun, C.A.O., Ruijun, W.A.N.G., Qing, H.E. (2012): Synthesis kinetics and thermophysical properties of La2 (Zr0. 7Ce0. 3) 2O7 ceramic for thermal barrier coatings. – Journal of Rare Earths 30(3): 228-232.

Xu, H., Guo, H. (Eds.). (2011). Thermal barrier coatings. – Woodhead Pub Limited 193-197.

Zhang, H., Guo, L., Ma, H., Peng, H., Guo, H., Gong, S. (2014): Thermal cyclic behaviour of (Gd0.9Yb0.1)2Zr2O7/8YSZ gradient thermal barrier coatings deposited on Hf-doped NiAl bond coat by EB-PVD. – Surface and Coatings Technology 258: 950-955.

Zhao, H., Yu, Z., Wadley, H.N. (2010): The influence of coating compliance on the delamination of thermal barrier coatings. – Surface and Coatings Technology 204(15): 2432-2441.

Zhong, X., Zhao, H., Zhou, X., Liu, C., Wang, L., Shao, F., Yang, K., Tao, S. and Ding, C. (2014): Thermal shock behavior of toughened gadolinium zirconate/YSZ double-ceramic-layered thermal barrier coating. – Journal of alloys and compounds 593: 50-55.




How to Cite

MOHD YUNUS, S., & JOHARI, A. D. (2020). EFFECT OF ISOTHERMAL OXIDATION ON ADHESION STRENGTH FOR TYPICAL YSZ AND RARE-EARTH LZO THERMAL BARRIER COATING. Quantum Journal of Engineering, Science and Technology, 1(2), 1–9. Retrieved from https://qjoest.com/index.php/qjoest/article/view/5