Investigation of evaluated temperature oxidation for IN-738 LC superalloy turbine blade thermally coated by AL2O3 using slurry coating process

Authors

DOI:

https://doi.org/10.15587/1729-4061.2022.259937

Keywords:

slurry, coating, aluminizing, turbine blades, oxidation, IN 738 LC, superalloys, surface roughness

Abstract

The study aims to investigate the effect of Al2O3 and Al additions to Nickel-base superalloys as a coating layer on oxidation resistance, and structural behavior of nickel superalloys such as IN 738 LC. Nickel-base superalloys are popular as base materials for hot components in industrial gas turbines such as blades due to their superior mechanical performance and high-temperature oxidation resistance, but the combustion gases' existence generates hot oxidation at high temperatures for long durations of time, resulting in corrosion of turbine blades which lead to massive economic losses. Turbine blades used in Iraqi electrical gas power stations require costly maintenance using traditional processes regularly. These blades are made of nickel superalloys such as IN 738 LC(Inconel 738). Few scientists investigated the impact of Al2O3 or Al additions to Nickel-base superalloys as coating layer by using the slurry coating method on oxidation resistance to enhance the Nickel-base superalloy's oxidation resistance. In this study, IN 738 LC is coated with two different coating percentages, the first being (10 Al+90 Al2O3) and the second being (40 Al+60 Al2O3). Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) were performed on all samples before and after oxidation. According to the results, SEM images of the surface revealed that the layer of the surface has a relatively moderated porosity value and that some of the coating layers contain micro-cracks. The best surface roughness of specimens coated with 60 % alumina+40 % aluminum was 5.752 nm. Whereas, the surface roughness of specimens coated with 90 % alumina+10 % aluminum was 6.367 nm.Results reveal that alloys with both Al2O3 and Al additions have reported a positive synergistic effect of the Al2O3and Al additions on oxidation resistance. Moreover,the NiCrAl2O3 thermal coating has good oxidation resistance and the effective temperature of anti-oxidation is raised to 1100 °C in turn reducing the maintenance period of turbine blades

Supporting Agency

  • The authors would like to express their gratitude for the support provided by the University of Baghdad, Iraq.

Author Biographies

Naseer Abdulrazzaq Mousa, University of Baghdad

Lecture, MSc in Mechanical Engineering

Department of Reconstruction and Projects

Bajel Mohammed Alshadeedi, University of Baghdad

Assistance Lecture, MSc in Mechanical Engineering

Department of Reconstruction and Projects

Osam Hassan Attia, University of Baghdad

Lecture, Doctor in Mechanical Engineering

Department of Reconstruction and Projects

Hussein Adel Mahmood, University of Baghdad

Lecture, Doctor in Mechanical Engineering

Department of Reconstruction and Projects

Nor Mariah Adam, Universiti Putra Malaysia

Professor, Doctor in Mechanical Engineering

Department of Chemical and Environmental Engineering

Faculty of engineering

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Published

2022-06-30

How to Cite

Mousa, N. A., Alshadeedi, B. M., Attia, O. H., Mahmood, H. A., & Adam, N. M. (2022). Investigation of evaluated temperature oxidation for IN-738 LC superalloy turbine blade thermally coated by AL2O3 using slurry coating process. Eastern-European Journal of Enterprise Technologies, 3(12 (117), 34–41. https://doi.org/10.15587/1729-4061.2022.259937

Issue

Vol. 3 No. 12 (117) (2022): Materials Science

Section

Materials Science

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Copyright (c) 2022 Naseer Abdulrazzaq Mousa, Bajel Mohammed Alshadeedi, Osam Hassan Attia, Hussein Adel Mahmood, Nor Mariah Adam

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