Microstructural Evolution and Tribological Responses of Heat-Treated AlFeCoNiCr–Cr3C2 Coating

IF 3.2 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS
Q. Liu, G. Ji, L. Yang, P. F. Zhang, K. Y. Li, Z. W. Gao, L. S. Qiu, X. G. Hu, Y. Wang
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引用次数: 0

Abstract

Metal–carbide coatings with high hardness, high wear resistance and good thermal stability are widely used for surface protection of key equipment in high-temperature environments. However, the metal binder is susceptible to oxidized spalling and wear failure during long-term operation. This leads to severe limitations in the service life and stability of the coatings. In this study, an AlFeCoNiCr–Cr3C2 coating with high-entropy alloy as metal binder was fabricated by supersonic atmospheric plasma spraying. The effect of heat treatment on the microstructure, mechanical properties and tribological responses of the coating was studied comparatively. The results suggested that heat treatment at 600 °C resulted in the formation of nano-carbides (Cr23C6), a disordered BCC and FCC phases. The evolution of the phase structure synergistically increased hardness and toughness, thereby reducing wear rate and improving the high-temperature wear resistance. The primary wear mechanisms were abrasive and oxidation wear. Wear debris consisted mainly of phases such as NiCr2O4, Al2O3, NiO and Fe2O3.

Graphical Abstract

Abstract Image

热处理 AlFeCoNiCr-Cr3C2 涂层的微结构演变和摩擦学响应
摘要具有高硬度、高耐磨性和良好热稳定性的金属碳化物涂层被广泛用于高温环境下关键设备的表面保护。然而,在长期运行过程中,金属粘结剂容易发生氧化剥落和磨损失效。这严重限制了涂层的使用寿命和稳定性。在本研究中,采用超音速大气等离子喷涂技术制造了以高熵合金为金属粘结剂的 AlFeCoNiCr-Cr3C2 涂层。比较研究了热处理对涂层微观结构、机械性能和摩擦学响应的影响。结果表明,在 600 °C 下进行热处理会形成纳米碳化物 (Cr23C6)、无序 BCC 和 FCC 相。相结构的演变协同提高了硬度和韧性,从而降低了磨损率并改善了高温耐磨性。主要的磨损机制是磨料磨损和氧化磨损。磨损碎片主要由 NiCr2O4、Al2O3、NiO 和 Fe2O3 等相组成。
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来源期刊
Journal of Thermal Spray Technology
Journal of Thermal Spray Technology 工程技术-材料科学:膜
CiteScore
5.20
自引率
25.80%
发文量
198
审稿时长
2.6 months
期刊介绍: From the scientific to the practical, stay on top of advances in this fast-growing coating technology with ASM International''s Journal of Thermal Spray Technology. Critically reviewed scientific papers and engineering articles combine the best of new research with the latest applications and problem solving. A service of the ASM Thermal Spray Society (TSS), the Journal of Thermal Spray Technology covers all fundamental and practical aspects of thermal spray science, including processes, feedstock manufacture, and testing and characterization. The journal contains worldwide coverage of the latest research, products, equipment and process developments, and includes technical note case studies from real-time applications and in-depth topical reviews.
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