Title: Corrosion, adhesion and erosion study of MZ and ML system using thermal plasma

Authors: B. Shreeram; I. Rajendran

Addresses: Department of Mechanical Engineering, Dr. N.G.P. Institute of Technology, Coimbatore – 641048, Tamilnadu, India ' Department of Mechanical Engineering, Dr. Mahalingam College of Engineering and Technology, Pollachi – 642003, Tamilnadu, India

Abstract: Mullite processed through thermal plasma has been identified as promising material in ceramic industry for thermal barrier coating (TBC) applications. Addition of ZrO₂ as impurities reduces the fracture toughness property of mullite coatings. In the current study, effort has been taken to compare the performance of La₂O₃ as an equivalent material to ZrO₂. Here MZ (Mullite-ZrO₂) and ML composites (Mullite-La₂O₃) have been prepared in different weight proportions of 10%, 20% and 30%. The MZ and ML composites are ball milled for 2 hr and sprayed over AISI 1045 steel specimen at 15 cm and 20 cm spray distance using 15kW thermal plasma torch. The MZ and ML coated samples were studied for SEM, XRD, adhesion test, roughness, wear, sliding test and coating thickness. Though the ML material has not been tested for exact application, but the study reveals that La₂O₃ can be used as cost effective material for TBC applications.

Keywords: mullite; TBC; thermal plasma spraying; lanthanum oxide; zircon oxide.

DOI: 10.1504/IJHVS.2018.094831

International Journal of Heavy Vehicle Systems, 2018 Vol.25 No.3/4, pp.406 - 418

Received: 29 Sep 2017
Accepted: 16 Oct 2017
Published online: 24 Sep 2018 *

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