Microstructure and High-Temperature Oxidation Properties of Nb2O5/TiO2 Composite Coatings Based on Ti6Al4V through Micro-arc Oxidation

IF 2.2 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Engineering and Performance Pub Date : 2023-09-05 DOI:10.1007/s11665-023-08602-0

Yupeng Guo, Diankai Wang, Jian Chen, Xiaofeng Lu, Xiaolei Zhu

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Abstract

Nb₂O₅/TiO₂ composite coatings were prepared in sodium silicate electrolyte, and the high-temperature oxidation properties of the coatings were improved. SEM showed that the number of micro-pores on the surface of the coatings decreased, and the content of Nb₂O₅ increased from 0 to 9.45% with the increase in Nb₂O₅ concentration. The coatings comprised O, Na, Al, Si, P, K, Ti, and Nb. Nb entered and was uniformly distributed in the coatings, and its content increased from 0 to 13.76%. Meanwhile, the thickness of the coatings increased from 29.57 to 43.27 µm. The coatings comprised anatase-TiO₂, rutile-TiO₂, Nb₂O₅, and Al₂TiO₅. The valence of Nb was assigned to Nb₂O₅ and Nb_xO_y. The average oxidation rate decreased from 2.4333 × 10⁻⁵ to 2.8056 × 10⁻⁶ mg cm⁻² s⁻¹. Nb₂O₅ in the coatings hindered the high-temperature oxidation process and improved the high-temperature properties of the coatings.

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基于 Ti6Al4V 的 Nb2O5/TiO2 复合涂层的微弧氧化显微结构和高温氧化性能

在硅酸钠电解液中制备了 Nb2O5/TiO2 复合涂层，并改善了涂层的高温氧化性能。扫描电镜显示，涂层表面的微孔数量减少，随着 Nb2O5 浓度的增加，Nb2O5 的含量从 0% 增加到 9.45%。涂层由 O、Na、Al、Si、P、K、Ti 和 Nb 组成。铌进入并均匀分布在涂层中，其含量从 0% 增加到 13.76%。同时，涂层厚度从 29.57 微米增加到 43.27 微米。涂层由锐钛矿-二氧化钛、金红石型二氧化钛、Nb2O5 和 Al2TiO5 组成。铌的化合价为 Nb2O5 和 NbxOy。平均氧化率从 2.4333 × 10-5 降至 2.8056 × 10-6 mg cm-2 s-1。涂层中的 Nb2O5 阻止了高温氧化过程，改善了涂层的高温性能。

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来源期刊

Journal of Materials Engineering and Performance 工程技术-材料科学：综合

CiteScore

3.90

自引率

13.00%

发文量

1120

审稿时长

4.9 months

期刊介绍： ASM International''s Journal of Materials Engineering and Performance focuses on solving day-to-day engineering challenges, particularly those involving components for larger systems. The journal presents a clear understanding of relationships between materials selection, processing, applications and performance. The Journal of Materials Engineering covers all aspects of materials selection, design, processing, characterization and evaluation, including how to improve materials properties through processes and process control of casting, forming, heat treating, surface modification and coating, and fabrication. Testing and characterization (including mechanical and physical tests, NDE, metallography, failure analysis, corrosion resistance, chemical analysis, surface characterization, and microanalysis of surfaces, features and fractures), and industrial performance measurement are also covered