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Tailoring of Functionally Graded Mullite: La2O3 Coatings by Transferred Arc Plasma for Thermal Barrier Coatings

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Abstract

Mullite is the most attractive material in Material Science for TBC—thermal barrier coatings. As a TBC material, enhancement in its properties like thermal shock resistance is reported when an intermittent phase like lanthanum oxide—La2O3 is introduced. In this present research, effort has been put to identify La2O3 as an equivalent TBC material to Zirconia—ZrO2. A mixture of MZ (Mullite–ZrO2) and ML (Mullite–La2O3) at 10–30% weight ratio as top coat and NiCr as bond coat, is plasma sprayed on A356 aluminium specimen treated to T6 condition. The results obtained indicate that the ML2 plasma sprayed coatings exhibit regularly formed grain structure that increases the fracture toughness. The average hardness value and average adhesion strength values of the ML coatings were are 13.3 GPa and 9.5 MPa, which was 1.6 and 1.2 times larger than the traditional Zirconia coatings. The ML coatings also showed no corrosion or spallation or crack formation after 100 h of NACL salt spray test and after 100 cycles of thermal shock load at 550 °C at a cycle time of 10 min.

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Acknowledgements

A Special thanks to Dr. G. Shanmugavelayutham—Associate Professor, Department of Physics, Bharathiar University for his constant support and guidance in conducting the TAP experiments.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Dr. N.G.P. Institute of Technology, Coimbatore, Tamilnadu, India

    B. Shreeram

  2. Department of Mechanical Engineering, Dr. Mahalingam College of Engineering and Technology, Pollachi, Tamilnadu, India

    I. Rajendran

  3. Department of Physics, Dr. N.G.P. Institute of Technology, Coimbatore, Tamilnadu, India

    E. Ranjith Kumar

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  1. B. Shreeram
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  3. E. Ranjith Kumar
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Correspondence to E. Ranjith Kumar.

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Shreeram, B., Rajendran, I. & Ranjith Kumar, E. Tailoring of Functionally Graded Mullite: La2O3 Coatings by Transferred Arc Plasma for Thermal Barrier Coatings. J Inorg Organomet Polym 28, 2484–2493 (2018). https://doi.org/10.1007/s10904-018-0920-x

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