Thermal shock resistance of yttrium aluminium oxide Y3Al5O12 thermal barrier coating for titanium alloy

  • Mohammed A. Almomani Industrial Engineering Department, Faculty of Engineering, Jordan University of Science and Technology, P.O. Box 3030, Irbid, 22110, Jordan.
  • Mohamad I. Al-Widyan Mechanical Engineering Department, Faculty of Engineering, Jordan University of Science and Technology, P.O. Box 3030, Irbid, 22110, Jordan.
  • Sulaiman M. Mohaidat Mechanical Engineering Department, Faculty of Engineering, Jordan University of Science and Technology, P.O. Box 3030, Irbid, 22110, Jordan.
Keywords: Thermal barrier coating, Yttrium aluminium oxide, Thermal shock resistance

Abstract

The high strength-to- weight ratio of titanium alloys allows their use in jet engines. However, their use is restricted by susceptibility to oxidation at high temperatures. In this study, the possibility of increasing the operating temperature of titanium alloys through using Yttrium Aluminum Oxide (YAG) as a thermal barrier coating material for Ti-6Al-4V substrate is studied. The study concludes that YAG can be utilized to increase the operating temperature of Ti-6Al-4V titanium alloy from around 350 °C to 800 °C due to its low thermal conductivity and phase stability up to its melting point. In addition, its lower oxygen diffusivity in comparison with the standard YSZ material will provide a better protection of the titanium substrate from oxidation. In this work, coating was created using atmospheric plasma spray. X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM) were used to examine coatings' composition and structure. The coating was characterized by thermal shock test, Vickers hardness test and adhesion strength test. X-ray diffraction indicated that the coating was of a partially crystalline Y3Al5O12 composition. The coating was porous with excellent thermal shock resistance at 800 oC, with a Vickers micro-hardness of 331.35 HV and adhesion strength of 17.6 MPa.

Author Biographies

Mohamad I. Al-Widyan, Mechanical Engineering Department, Faculty of Engineering, Jordan University of Science and Technology, P.O. Box 3030, Irbid, 22110, Jordan.

Dr. Mohamad Al-Widyan is a professor at Mechanical Engineering department of Jordan University of Science and Technology. He is currently the director of Academic Development and Quality Assurance Center of Jordan University of Science and Technology. He has PhD of Mechanical Engineering from University of Florida at 1997.

Sulaiman M. Mohaidat, Mechanical Engineering Department, Faculty of Engineering, Jordan University of Science and Technology, P.O. Box 3030, Irbid, 22110, Jordan.

Eng. Sulaiman Mohaidat earned his master degree  of Mechanical Engineering from Jordan University of Sceince and Tehcnology at 2018. In his thesis work, he developed a new thermal barrier coating of YAG to increase operating temperature of titanium alloy in Jet engines.

Published
2020-03-23
How to Cite
Almomani, M., Al-Widyan, M., & Mohaidat, S. (2020). Thermal shock resistance of yttrium aluminium oxide Y3Al5O12 thermal barrier coating for titanium alloy. Journal of Mechanical Engineering and Sciences, 14(1), 6514 - 6525. https://doi.org/10.15282/jmes.14.1.2020.26.0511
Section
Article