Nanomechanical Behavior of Top and Bond Layer in TBC

Yıl 2024, Cilt: 7 Sayı: 2, 184 - 190, 30.11.2024

Müge Akdemir , Merve Canbolat , Serra Bayram , Yasemin Kılıç , Ahmet Arda İnceyer , Huseyin Aydin , Hüseyin Çimenoğlu

https://doi.org/10.34088/kojose.1387787

Öz

Thermal barrier coatings (TBC) have been developed to reduce the surface temperature of hot components in gas turbine engines. To get superior oxidation and mechanical properties, “The Yttria Stabilized Zirconia (YSZ)” top coat and β-NiAl bond coat are deposited by Electron Beam Physical Vapor Deposition (EB-PVD) and Chemical Vapor Deposition (CVD) processes, respectively. In this study, after structural characterization of the TBC formed on the directionally solidified (DS) CM247LC superalloy, the nanomechanical properties of the top and bond coats were determined using the nanoindentation technique. The results showed no significant differences in their elastic modulus despite the more than two times higher hardness of the top coat than the bond coat (18.4 GPa and 7.2 GPa, respectively). Energy Dispersive Spectrometry (EDS) equipped with Scanning Electron Microscope examinations revealed that Al and N- and N-rich zones within the bond coat have an underlying diffusion zone. In addition, thermal-grown oxide (TGO) film was detected at the interface of the top and bond coat.

Anahtar Kelimeler

Thermal barrier coating, Aluminide coating, EB-PVD YSZ coating, Nanoindentation, Microstructure

Kaynakça

• [1] Wahl J.B., Harris K., 2011. Advanced Ni base superalloys for small gas turbines. Canadiand Metallurgical Quaterly, pp 207-214.
• [2] Bose S., 2018. High Temperature Coatings, 2 nd ed. Elsevier.
• [3] Dong H., 2010. Surface Engineering Of Light Alloys : Aluminum, Magnesium And Titanium Alloys, 1 st ed. Woodhead Pub.
• [4] Chandio A.D., Abro S.H., 2018. Effect Of Temperature And Time On Nickel Aluminide Coating Deposition, Mehran University Research Journal Of Engineering And Technology, 37, pp. 491–496.
• [5] Ertürk U., 2017. Production And Development Of Aluminide Coatings By Chemical Vapor Deposition On Nickel Based Superalloys For Turbine Engine Applications. MSc Thesis, Natural And Applied Sciences Of Middle East Technical University.
• [6] Zubacheva O.A., 2004. Plasma-Sprayed And Physically Vapor Deposited Thermal Barrier Coatings: Comparative Analysis Of Thermoelastic Behavior Based On Curvature Studies. PhD Thesis, RWTH Aachen University.
• [7] Peters M., Leyens C., Schulz U., Kaysser W.A., 2001. Eb-Pvd Thermal Barrier Coatings For Aeroengines And Gas Turbines. Advanced Engineering Materials, 3(4), pp. 192-204.
• [8] Chen J., Beake B.D., Wellman R.G., Nicholls J.R., Dong H., 2012. An İnvestigation İnto The Correlation Between Nano-İmpact Resistance And Erosion Performance Of EB-PVD Thermal Barrier Coatings On Thermal Ageing, Surface Coating Technology. 206(23), pp. 4992–4998.
• [9] Wang X., Wang C., Atkinson A., 2012. Interface Fracture Toughness İn Thermal Barrier Coatings By Cross-Sectional İndentation, Acta Materials, 60, pp. 6152–6163.
• [10] Gabel S., Giese S., Webler R.U., Neumeier S., Göken M., 2022. Microcantilever Fracture Tests Of Α-Cr Containing Nial Bond Coats, Advanced Engineering Materials, 24(7).
• [11] Xu Z., Wang Z., Huang G., Mu R., He L., 2015. Thermal Cycling Behavior Of Eb-Pvd Tbcs On Cvd Platinum Modified Aluminide Coatings, Journal of Alloys and Compounds, 637, pp. 226–233.
• [12] Dharini T., Kuppusami P., Kumar N., Kumar D.D., Soman A.K., Kirubaharan A.M.K., 2021. Tribological Properties Of Ysz And Ysz/Ni-Ysz Nanocomposite Coatings Prepared By Electron Beam Physical Vapour Deposition, Ceramics International, 47(18), pp. 26010–26018.
• [13] Jang B.K., Kim S.H., Fisher C.A.J., Kim H.T., 2022. Effect Of Isothermal Heat Treatment On Nanoindentation Hardness And Young’s Modulus Of 4 Mol% Y2O3-ZrO2 EB-PVD TBCs, Materials Today Communication, 31.
• [14] Song, X., Zhang, Y.D., Jiang, C., Liu, Z., Lin, C., Zheng, W. Zeng, Y., 2023. Thermophysical and mechanical properties of cubic, tetragonal and monoclinic ZrO2. Journal of Materials Research and Technology, 23, pp. 648-655.
• [15] Mahade S., 2016. Functional Performance Of Gadolinium Zirconate/Yttria Stabilized Zirconia Multi-Layered Thermal Barrier Coatings. Phd Thesis, University West, Sweden. Isbn: 978-91-87531-37-8.
• [17] Vignesh B., Oliver W.C., Kumar G.S., And Phani P.S., 2019. Critical Assessment Of High Speed Nanoindentation Mapping Technique And Data Deconvolution On Thermal Barrier Coatings. Materals and Design, 181.
• [18] Lee K.I, 1998. Protective Coatings For Gas Turbines. The Gas Turbine Handbook, Chap.4.4.2, Edited By Netl, 419-438, 2006.
• [19] Pillai, R., Chyrkin, A., Grüner, D., Nowak, W., Zheng, N., Kliewe, A., Quadakkers, W.J., 2016. Carbides in an aluminised single crystal superalloy: Tracing the source of carbon. Surface and Coatings Technology, 288, pp. 15-24.
• [20] Oliver, W. C., & Pharr, G. M., 1992. An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments. J. Mater. Res., 7(6), pp.1564-1583.
• [21] Verma V., Patel S.,Swarnkar V., Rajput S.K., 2018. Effect Of Coating Thickness On Microstructure And Low Temperature Cyclic Thermal Fatigue Behavior Of Thermal Barrier Coating (Al2O3). Iop Conf. Series: Materials Science And Engineering, 330, 012050.
• [22] Pfeiffer C., Affeldt E., Göken M., 2011. Miniaturized bend tests on partially stabilized EB-PVD ZrO. thermal barrier coating. Surface and Coating Technology, 205(10), pp. 3245-3250.
• [23] Grimme C., Oskay C., Mengis L., Galetz M.C., 2021. High temperature wear behavior of δ-Ni2Al3 and β-NiAl coatings formed on pure nickel using pack cementation process and diffusion heat treatment. Wear, 477.
• [24] Oskay C., Rudolphia M., Affeldtb E.E., Schützea M., Galetz M.C., 2017. Evolution of microstructure and mechanical properties of NiAl-Diffusion coatings after thermocyclic exposure. Intermetallics, 89, pp. 22-31.
• [25] Rusovic N., Warlimont H., 1979. Young's Modulus of β2-NiAl Alloys. Physica Status Solidi (a), 53, pp. 283.
• [26] Webler R., Krottenthaler M., Neumeier S., Durst K., Goken M., 2012. Local fracture toughness and residual stress measurements on NiAl bond coats by micro cantilever and FIB-based bar milling tests, in: E.S. Huron, R.C. Reed, M.C. Hardy, M.J. Mills, R.E. Montero, P.D. Portella, J. Telesman (Eds.), Proceedings of the 12th International Symposium on Superalloys, John Wiley & Sons, Hoboken, NJ, USA, pp. 93–102.
• [27] Noebe R.D., Bowman R.R., Nathal M.V., 2013. Physical and mechanical properties of the B2 compound NiAl. International Materials Review, 38, pp. 193-232.