Preparation of NiCr/YSZ two-layered burn-resistant coating on γ-TiAl alloys based on plasma surface metallurgy and ion plating methods

IF 0.9 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING Journal of Mining and Metallurgy Section B-Metallurgy Pub Date : 2021-01-01 DOI:10.2298/JMMB200902005W

D. Wei, M. Li, Xiaoyong Zhou, Fengkun Li, Shuqin Li, Pingze Zhang

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引用次数: 2

Abstract

The NiCr/YSZ coating was fabricated on ?-TiAl alloy by double glow plasma surface metallurgy technology and multi-arc ion plating technology. The microstructure, microhardness, bonding strength, and burn resistance of NiCr/YSZ coating were studied in detail. The results showed that the NiCr/YSZ coating was dense and homogeneous, including a duplex structure of top YSZ ceramic coating and underlying Ni-Cr bond coating. The average microhardness of NiCr/YSZ coating was raised by a factor of about 2 compared to the ?-TiAl substrate. The thermal shock test indicated that the composite structure had superior bonding strength and the defects such as metal droplets on the ceramic coating were the source of cracks. The high-energy laser beam destroyed the surface of ?-TiAl alloy, forming protruding combustion products in ablation zone and splashing residues around ablation zone. When coated by NiCr/YSZ coating, the combustion process was delayed through isolating and dissipating heat. The ablation range was controlled and the ablation damage was reduced at the same irradiation power. The NiCr/YSZ coating preliminarily realized to improve the burn resistance of ?- TiAl alloy.

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基于等离子体表面冶金和离子镀法制备γ-TiAl合金NiCr/YSZ双层耐烧涂层

采用双辉光等离子体表面冶金技术和多弧离子镀技术在tial合金表面制备了NiCr/YSZ镀层。详细研究了NiCr/YSZ涂层的显微组织、显微硬度、结合强度和耐烧性能。结果表明:NiCr/YSZ涂层致密均匀，为上层YSZ陶瓷涂层和下层Ni-Cr键合涂层的双相结构;NiCr/YSZ涂层的平均显微硬度比-TiAl基体提高了约2倍。热冲击试验表明，复合材料具有较好的结合强度，陶瓷涂层上的金属液滴等缺陷是裂纹产生的主要原因。高能激光束破坏了γ -TiAl合金的表面，在烧蚀区形成突出的燃烧产物，烧蚀区周围形成飞溅残余物。涂覆NiCr/YSZ涂层后，通过隔离散热延缓燃烧过程。在相同辐照功率下，控制了烧蚀范围，减小了烧蚀损伤。初步实现了NiCr/YSZ涂层提高TiAl合金的耐烧性能。

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来源期刊

Journal of Mining and Metallurgy Section B-Metallurgy 工程技术-冶金工程

CiteScore

2.00

自引率

40.00%

发文量

审稿时长

2 months

期刊介绍： University of Belgrade, Technical Faculty in Bor, has been publishing the journal called Journal of Mining and Metallurgy since 1965 and in 1997 it was divided in two independent journals dealing with mining and metallurgy separately. Since 2009 Journal of Mining and Metallurgy, Section B: Metallurgy has been accepted in Science Citation Index Expanded. Journal of Mining and Metallurgy, Section B: Metallurgy presents an international medium for the publication of contributions on original research which reflect the new progresses in theory and practice of metallurgy. The Journal covers the latest research in all aspects of metallurgy including hydrometallurgy, pyrometallurgy, electrometallurgy, transport phenomena, process control, solidification, mechanical working, solid state reactions, materials processing, surface treatment and relationships among processing, structure, and properties of materials.