飞行液滴内高温熔融氧化物对NiCrAlY薄片与基体结合机制的影响

IF 6.1 2区 材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS
Yong-Sheng Zhu, Xin-Yuan Dong, Xiao-Tao Luo, Yan Wang, Chang-Jiu Li
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引用次数: 0

摘要

在大气等离子体喷涂沉积金属涂层过程中,等离子体射流中的空气夹带不可避免地导致熔融金属液滴的氧化。在飞行过程中形成的氧化物在金属涂层中积累,与大块涂层相比,这大大降低了涂层的性能。人们普遍认为,金属液滴的飞行氧化行为及其表面氧化物的状态是影响金属液滴在基体表面后续扩散行为和键合形成的关键因素。在本工作中,用液体N2收集了单个飞行中的液滴,研究了它们在飞行中的氧化和液滴表面的氧化状态。利用聚焦离子束(FIB)技术和高分辨率透射电子显微镜(TEM)研究了飞行氧化对NiCrAlY薄片与高温合金基体结合的影响。结果表明,在等离子体射流内部飞行过程中形成的氧化物主要以两种形式存在,一种是颗粒内部的小尺寸氧化结节,另一种是颗粒表面的氧化帽。对溅落形貌的SEM检测表明,当NiCrAlY金属液滴在等离子体射流中运动时,高温熔融氧化帽位于液滴尾部。这种氧化物分布模式导致金属液滴首先冲击衬底,然后在金属片表面沉积氧化物。FIB分析表明,熔融氧化物沉积在NiCrAlY板片表面,但不影响板片与基体碰撞中心的界面结合。然而,这些氧化物会在薄片的外围造成包裹,阻碍薄片与衬底之间的结合。TEM证据证实,由于没有氧化膜,在颗粒的冲击中心形成了冶金结合。化学键是局部实现在含氧化物界面,而分层主导大多数界面区域。研究了高温熔融氧化物对NiCrAlY薄片与基体结合机理的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of high-temperature molten oxides within in-flight droplet on the bonding formation mechanism between NiCrAlY splat and substrate
During metallic coating deposition by atmospheric plasma spraying (APS), air entrainment into the plasma jet inevitably leads to oxidation of the molten metallic droplets. The oxides formed in-flight accumulate within the metallic coating, which significantly degrades the performance of the coating compared to the bulk counterpart. It is widely believed that the in-flight oxidation behavior of metal droplets and the state of oxides on their surfaces are critical factors affecting the subsequent spreading behavior and bonding formation of the metal droplet on the substrate surface. In the present work, individual in-flight droplets were collected with liquid N2 to investigate their in-flight oxidation and the oxide state on the droplet surfaces. The effect of in-flight oxidation on the bonding formation of NiCrAlY splats with the superalloy substrate was examined by the focus ion beam (FIB) technique and high-resolution transmission electron microscopy (TEM). Results reveal that the oxides formed during flight within the plasma jet primarily exist in two forms, including small-sized oxide nodules inside the particles and an oxide cap covering the particle surface. SEM examination of splat morphology shows that the high-temperature molten oxide cap is located in the tail of the NiCrAlY metal droplet when the droplet travels through the plasma jet. This oxide distribution pattern results in the metal droplet impacting the substrate first, followed by the deposition of the oxide on the metal splat surface. FIB analysis reveals that the molten oxides deposit on the NiCrAlY splat surfaces without affecting the interfacial bonding at the impact center between splats and substrate. However, these oxides cause entrapment at the periphery of the splats and hinder the bonding between the splats and the substrate. TEM evidence confirms that metallurgical bonding forms at the impact center of the particle due to the absence of oxide film. Chemical bonding is locally achieved at oxide-containing interfaces, whereas delamination dominates most interfacial regions. The effect of high-temperature molten oxides on the bonding mechanism between NiCrAlY splat and substrate is addressed.
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来源期刊
Surface & Coatings Technology
Surface & Coatings Technology 工程技术-材料科学:膜
CiteScore
10.00
自引率
11.10%
发文量
921
审稿时长
19 days
期刊介绍: Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.
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