Almaz Nazarov, Alexey Maslov, Elena A. Korznikova, Kamil Ramazanov
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Post-exposure to the furnace without prior vacuum annealing results in coatings exhibiting a porous microstructure, raising concerns regarding oxidation protection. This investigation of Cr-Al coatings on a VTI-4 alloy substrate yields valuable insights into their nanolaminate structure and challenges associated with aluminum droplet fractions. The proposed additional vacuum heat treatment at 650 °C for 500 h effectively homogenizes the coating, leading to predominant Cr2Al and Ti-Al phases. Additionally, the formation of diffusion layers at the “coating–substrate” interface and the presence of oxide barriers contribute to the coatings’ heat resistance. Our research introduces possibilities for tailoring coating properties for specific high-temperature applications in aerospace, energy, or industrial contexts. 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引用次数: 0
摘要
本文探讨了如何利用阴极电弧沉积铬-铝覆盖层作为钛-铝-铌金属间合金的氧化保护。主要目的是研究通过阴极电弧沉积沉积的 PVD 铝-铬涂层,而无需随后进行真空退火。使用扫描电子显微镜、能量色散 X 射线光谱和 X 射线衍射分析对涂层的微观结构、相和化学成分进行了表征。在实验室空气炉中对样品进行了等温暴露,发现铬-铝涂层在保护 Ti49-11Al-40Nb-1.5Zr-0.75V-0.75Mo-0.2Si(质量百分比)金属间合金 VTI-4 免受氧化方面的功效。研究结果表明,沉积涂层具有层状结构,并含有铝铬金属间化合物。在未进行真空退火的情况下将镀层暴露于炉中,会导致镀层呈现多孔微观结构,从而引发对氧化保护的担忧。通过对 VTI-4 合金基材上的铬-铝涂层的研究,可以深入了解其纳米层状结构以及与铝液滴分数相关的挑战。建议在 650 °C 下进行 500 小时的额外真空热处理可有效均匀镀层,从而形成主要的 Cr2Al 和 Ti-Al 相。此外,"涂层-基底 "界面扩散层的形成和氧化物屏障的存在也有助于提高涂层的耐热性。我们的研究为航空航天、能源或工业领域的特定高温应用提供了定制涂层特性的可能性。热处理工艺的进一步完善为开发具有更高性能特征的先进涂层提供了可能。
Chromium–Aluminum Coatings for Oxidation Protection of Titanium–Aluminum Intermetallic Alloys
This article explores the utilization of cathodic-arc deposition Cr-Al overlay coatings as oxidation protection for Ti-Al-Nb intermetallic alloys. The primary objective is to investigate PVD Al-Cr coatings deposited via cathodic-arc deposition without subsequent vacuum annealing. The microstructure, phase, and chemical composition of the coatings were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction analysis. Isothermal exposure of samples in a laboratory air furnace was conducted, revealing the efficacy of Cr-Al coatings in protecting the Ti49-11Al-40Nb-1.5Zr-0.75V-0.75Mo-0.2Si (mass%) intermetallic alloy VTI-4 against oxidation. The findings highlight that the as-deposited coatings possess a layered structure and contain Al-Cr intermetallics. Post-exposure to the furnace without prior vacuum annealing results in coatings exhibiting a porous microstructure, raising concerns regarding oxidation protection. This investigation of Cr-Al coatings on a VTI-4 alloy substrate yields valuable insights into their nanolaminate structure and challenges associated with aluminum droplet fractions. The proposed additional vacuum heat treatment at 650 °C for 500 h effectively homogenizes the coating, leading to predominant Cr2Al and Ti-Al phases. Additionally, the formation of diffusion layers at the “coating–substrate” interface and the presence of oxide barriers contribute to the coatings’ heat resistance. Our research introduces possibilities for tailoring coating properties for specific high-temperature applications in aerospace, energy, or industrial contexts. Further refinement of the heat treatment process offers the potential for developing advanced coatings with enhanced performance characteristics.