Optimization of Process Parameters for Plasma Sprayed Lanthanum Zirconate TBCs on Nickel Based Superalloy

Abstract:

Thermal Barrier Coating are highly advanced material systems usually applied to metallic surfaces, such as gas turbine or aero-engine parts, operating at elevated temperatures. They have ceramic and metallic multilayers which have been widely used in the aeroturbine engines to increase the life of metallic components and turbine efficiency. Many different types of coatings are used to protect variety of engineering materials from wear, corrosion and erosion. Of all these, TBC’s play a vital role in providing thermal insulation and protect the material from high temperature environment. In this paper Lanthanum Zirconate (La₂Zr₂O₇) is used as a coating material which is phase-stable to its melting point, Lanthanum Zirconate is a promising material which exhibit lower thermal conductivity and higher thermal stability compared to other TBC system. High quality Lanthanum Zirconate based TBC is developed by plasma spray technique on superalloys. In the present investigation porosity, microstructure, hardness and bond strength of the developed TBC’s were characterized and significant parameters of plasma spray process were identified.

• Periodical: Advances in Science and Technology (Volume 106)
• Pages: 90-96
• DOI: https://doi.org/10.4028/www.scientific.net/AST.106.90
• Online since: May 2021
• Authors: R. Keshavamurthy*, B.E. Naveena, T. Ramesh, N.K. Shashikumara
• Keywords: Bond Strength, Lanthanum Zirconate, Microstructure, Plasma Spray Coating, Porosity

References

[1] Jing Zhang, XingyeGuo, Yi Zhang, Zhe Lu, Hyun-Hee Choi, Yeon-Gil Jung and In-Soo Kim. Mechanical properties of lanthanum zirconate-based composite thermal barrier coatings, (2019), Advances in Applied Ceramics, 118:5, 257-263,.

DOI: 10.1080/17436753.2018.1564415

[2] Guo, Xingye. Thermomechanical properties of novel lanthanum zirconate based thermal barrier coatings - an integrated experimental and modeling study, (2016). Open Access Dissertations. 928. https://docs.lib.purdue.edu/open_access_dissertations/928.

[3] Jing Zhang, XingyeGuo, Yeon-Gil Jung, Li Li and James Knapp. Lanthanum Zirconate Based Thermal Barrier Coatings: A Review, (2016) Surface and Coatings Technology. https://doi.org/10.1016/j.surfcoat.2016.10.019.

DOI: 10.1016/j.surfcoat.2016.10.019

[4] Keshavamurthy R, Naveena B E and Sekhar N. Thermal Spray Coatings for Erosion-Corrosion Protection. IGI Global, USA, (2018), ISBN 9781522541943. https://doi.org/10.4018/978-1-5225-4194-3.ch010.

[5] Naveena B.E, R. Keshavamurthy and N. Sekhar. Slurry erosive wear behaviour of plasma-sprayed flyash–Al2O3 coatings. Surface Engineering, Taylor & Francis, Edition, ISSN: 0267-0844 (Print) 1743-2944 (Online), 2017.

DOI: 10.1080/02670844.2017.1288341

[6] Naveena B.E, R. Keshavamurthy and N. Sekhar. Dry Sliding Wear Behaviour of Plasma Sprayed Flyash-Al2O3 and Flyash-SiC Coatings on the Al6061 Aluminum Alloy, Silicon, https://doi.org/10.1007/s12633-018-9978-x, © Springer Nature B.V. (2018).

DOI: 10.1007/s12633-018-9978-x

[7] R. Keshavamurthy, B E Naveena, AbrarAhamed, N Sekhar and Dada Peer. Corrosion Characteristics of Plasma Sprayed Flyash-SiC and Flyash-Al2O3 Composite Coatings on the Al-6061 Alloy, Materials Research Express, Materials Research Express, Volume 6, Number 8 © 2019 IOPscience, https://doi.org/10.1088/2053-1591/ab28e1.

DOI: 10.1088/2053-1591/ab28e1

[8] Mauer G., et al., Plasma-Sprayed Thermal Barrier Coatings: New Materials, Processing Issues, and Solutions. Journal of Thermal Spray Technology, 2013. 22(5): pp.646-658.

DOI: 10.1007/s11666-013-9889-8

[9] Hui Gon Chun, Tong Yul Cho, Jae Hong Yoon and Gun Hwan Lee. Improvement of Surface Properties of Inconel718 by HVOF Coating with WC-Metal Powder and by Laser Heat Treatment of the Coating. Advances in Materials Science and Engineering Volume 2015, Article ID 468120, 7 pages, http://dx.doi.org/10.1155/2015/468120.

DOI: 10.1155/2015/468120

[10] Jing Zhang, XingyeGuo, Yeon-Gil Jung, Li Li and James Knapp. Microstructural non-uniformity and mechanical property of air plasma-sprayed dense lanthanum zirconate thermal barrier coating. Materials Today: Proceedings 1 (2014) 11 – 16.

DOI: 10.1016/j.matpr.2014.09.003

[11] Naveena BE, Keshavamurthy R and Channabasappa BH. Studies on parametric optimization for plasma sprayed fly ashAl2O3 composite coatings. ApplMech Mater. 2015, 813–814, 511–515.

DOI: 10.4028/www.scientific.net/amm.813-814.511

[12] Naveena BE and Keshavamurthy R. Optimization of process parameters for thermally sprayed composite coatings using Taguchi's technique. Int J ApplEngg Res, ISSN 0973-4562 Vol. 10 No.55 (2015).

[13] J. R. Sunil, R. Keshavamurthy, C.P.S. Prakash and B.H. Channabasappa. Optimization of Process Parameters for Plasma Sprayed Flyash-Titania Composite Coatings, Materials Today: Proceedings, (2015).

DOI: 10.1016/j.matpr.2015.07.189