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<p>By aluminizing at varying temperature (600–700&#xa0;°C) and time (2–6&#xa0;h) cycles, defect-free, continuous and homogeneous thick Ni–Al deposition layers are obtained on Hastelloy C276 surface. Metallurgical analysis performed on surface/sub-surface indicates that NiAl<sub>3</sub> and Ni<sub>2</sub>Al<sub>3</sub> phases are the dominant phases within aluminide coatings (11–41&#xa0;μm). Since the experimental aluminizing process is a diffusion-controlled process, the processing output with variable temperature and time parameters made it possible to study the process kinetics, and the process-specific activation energy is calculated as 51&#xa0;kJ/mol. An equation is also derived from the regression model to estimate the coating thickness, and there is a good agreement between the coating thicknesses determined by the experimental and calculated values. The effect of temperature/time on the layer thickness is investigated with variance analysis. Although no significant change in the surface hardness value (~ 800&#xa0;HV) is measured regardless of the layer thickness, an increase in the layer thickness over time on material surface processed at the lowest temperature causes a significant decrease in the oxidation rate due to the presence of a stable Al-rich oxide. All these findings reveal the lowest cost coating conditions that can reduce the chemical degradation of Hastelloy C276 caused by oxidation at high temperatures.</p>

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Deposition of Oxidation-Resistant Hard Aluminide Layers on Hastelloy C-276: A Study on Microstructural and Kinetic Analysis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月20日

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  • Tuba Yener,
  • Muhammed Alaoğlu,
  • Ş. Hakan Atapek,
  • Gülşah Aktaş Çelik,
  • S. Çağrı Yener,
  • Neslihan Özsoy

摘要

By aluminizing at varying temperature (600–700 °C) and time (2–6 h) cycles, defect-free, continuous and homogeneous thick Ni–Al deposition layers are obtained on Hastelloy C276 surface. Metallurgical analysis performed on surface/sub-surface indicates that NiAl3 and Ni2Al3 phases are the dominant phases within aluminide coatings (11–41 μm). Since the experimental aluminizing process is a diffusion-controlled process, the processing output with variable temperature and time parameters made it possible to study the process kinetics, and the process-specific activation energy is calculated as 51 kJ/mol. An equation is also derived from the regression model to estimate the coating thickness, and there is a good agreement between the coating thicknesses determined by the experimental and calculated values. The effect of temperature/time on the layer thickness is investigated with variance analysis. Although no significant change in the surface hardness value (~ 800 HV) is measured regardless of the layer thickness, an increase in the layer thickness over time on material surface processed at the lowest temperature causes a significant decrease in the oxidation rate due to the presence of a stable Al-rich oxide. All these findings reveal the lowest cost coating conditions that can reduce the chemical degradation of Hastelloy C276 caused by oxidation at high temperatures.