镍基超级合金 (IN738LC) 上通过反应空气镀铝法沉积的两种不同铝化物涂层在 1000 °C 的等温氧化性能

IF 5.8 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Shayan Sarraf, Mansour Soltanieh, Saeed Rastegari
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引用次数: 0

摘要

本研究考察了 IN738LC 基材上两种铝涂层的等温氧化行为,这两种涂层是根据基材的标准热处理程序,通过活性空气镀铝 (RAA) 沉积而成,并在 1000 °C 的空气中放置 100 小时。包括 FE-SEM、SEM、X 射线衍射、拉曼光谱和 EDS 分析在内的表征技术显示,铝涂层呈现出受沉积温度和持续时间影响的高活性三层微观结构。高温涂层(1120 °C)表现出典型的相互扩散区(IDZ)结构和 α-Al2O3 鳞片,而低温涂层(845 °C)则表现出不寻常的 IDZ 和 γ-Al2O3 鳞片。氧化动力学显示出抛物线增重趋势,高温涂层的氧化率比低温涂层低约 100 倍,这表明涂层具有优异的抗氧化性。低温涂层在氧化后出现了从γ到α氧化铝的不完全转变。涂层降解的主要原因是铝向内扩散,而在缺乏扩散屏障 IDZ 层的低温涂层中,铝向内扩散的情况更为严重。值得注意的是,这两种类型的涂层在氧化过程中都没有形成氧化镍或氧化镍铝。这些发现强调了 RAA 沉积温度对铝涂层抗氧化性和微观结构稳定性的重要影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Isothermal Oxidation Performance at 1000 °C of Two Different Aluminide Coatings Deposited by the Reactive Air Aluminizing Method on a Nickel-Based Superalloy (IN738LC)
This study examines the isothermal oxidation behavior of two aluminide coatings on IN738LC substrates, deposited via reactive air aluminizing (RAA) based on the standard heat treatment procedure of the substrate and subjected to 1000 °C in the air for 100 hours. Characterization techniques, including FE-SEM, SEM, X-ray diffraction, Raman spectroscopy, and EDS analysis, revealed that the aluminide coatings exhibited a high-activity three-layer microstructure influenced by deposition temperature and duration. High-temperature coatings (1120 °C) exhibited a classic interdiffusion zone (IDZ) structure and α-Al2O3 scale, while lower-temperature coatings (845 °C) displayed an unusual IDZ and γ-Al2O3 scale. Oxidation kinetics showed a parabolic weight gain trend, with high-temperature coatings demonstrating approximately 100 times lower oxidation rates than low-temperature ones, indicating superior resistance. An incomplete transformation from γ to α alumina was identified in the lower-temperature coatings post-oxidation. Coating degradation was primarily due to inward aluminum diffusion, worsened in lower-temperature coatings, lacking a diffusion barrier IDZ layer. Remarkably, both coating types maintained their initial phases without forming NiO or NiAl2O4 during oxidation. These findings underscore the critical influence of the RAA deposition temperature on the oxidation resistance and microstructural stability of aluminide coatings.
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来源期刊
Journal of Alloys and Compounds
Journal of Alloys and Compounds 工程技术-材料科学:综合
CiteScore
11.10
自引率
14.50%
发文量
5146
审稿时长
67 days
期刊介绍: The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.
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