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Effect of Lanthanum Oxide as Thermal Barrier on the Aluminization Process of Nickel Base Superalloy (BV-18) | ||
| Journal of Education and Science | ||
| Article 1, Volume 34, Issue 1, January 2025, Pages 1-9 PDF (912.83 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.33899/edusj.2024.153234.1499 | ||
| Authors | ||
| Mahmood Majed Mahmood* ; Mahmood Ahmad Hamood; Samir Mahmood Ahmed | ||
| Department of Physics, College of Science, University of Mosul, Mosul, Iraq | ||
| Abstract | ||
| This research studied, the effect of lanthanum oxide as a thermal barrier on the highly effective aluminization process of a nickel-base superalloy was studied. The aluminization process was carried out using the solid cementation method at a temperature of (1000oC) in a vacuum atmosphere and for Periods of (2, 4, 6) hours after stabilizing the thermal barrier material(lanthanum oxide) on the samples. It was observed that the rate of mass gained and the rate of thickness of the resulting coating increase with time until it reaches the saturation point and takes the form of a parabolic curve. Examination with a scanning electron microscope (SEM-EDS) of the surface of a sample painted for six hours showed the presence of a high percentage of aluminum of the element lanthanum in addition to other elements of the base alloy material, Optical microscope examination showed that the coating layers are composed of three multi-phase regions (the outer layer, the inner layer, and the Interdiffusion zone), while X-ray analyses showed presence of some phases with a high melting point, such as (LaNi5, Al2La, and NiAl), which reflected positively on the alloy's resistance to hot corrosion, evident through the stability in the mass of the coated samples after testing them at a temperature of (900oC) in the presence of salt vapor from a mixture of sodium sulphate and sodium chloride. | ||
| Keywords | ||
| Diffusion Coating; Hot Corrosion; Surface Engineering | ||
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