Oxidation of a Mo-Si-B-Ti Alloy

IF 2.1 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Oxidation of Metals Pub Date : 2024-08-22 DOI:10.1007/s11085-024-10298-z

Longfei Liu, Liam F. Wood, Phalgun Nelaturu, Tianrui Duan, Chuan Zhang, Fan Zhang, Dan J. Thoma, John H. Perepezko

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Abstract

The oxidation of a titanium (Ti)-modified Mo-Si-B alloy designed for aerospace applications was investigated. Test samples were produced using arc melting and laser powder bed fusion (LPBF) additive manufacturing methods. To address high-temperature oxidation, a three-step coating strategy was employed, comprising a Mo precoat, Si and B co-deposition, and a conditioning step for the formation of a self-healing coating. The study evaluates the oxidation resistance of both uncoated and coated Mo-Si-B-Ti alloys at temperatures ranging from 1100 to 1300 °C. Uncoated alloys exhibited catastrophic mass loss within 10 hours at temperatures between 800 and 1300 °C. In contrast, the coated samples demonstrated minimal mass loss at 1300 °C after 50 hours, with only minor mass gain observed under cyclic thermal loading after 300 cycles. Microstructural analysis revealed distinct differences between arc-melted and LPBF samples, with the latter displaying an ultrafine dendritic microstructure. The applied coating effectively prevented oxygen diffusion into the substrate, even at elevated temperatures, showcasing its protective capabilities. During cyclic tests, the coating exhibited a self-healing mechanism, with cracks filled with borosilica contributing to prolonged environmental resistance.

Graphical Abstract

Abstract Image

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钼-硅-铋-钛合金的氧化作用

研究了为航空航天应用而设计的钛 (Ti) 改性 Mo-Si-B 合金的氧化情况。测试样品采用电弧熔化和激光粉末床熔融（LPBF）增材制造方法制成。为解决高温氧化问题，采用了三步涂层策略，包括 Mo 预涂层、Si 和 B 共沉积以及形成自修复涂层的调节步骤。研究评估了未涂层和涂层钼-硅-铍-钛合金在 1100 至 1300 °C 温度下的抗氧化性。在温度为 800 至 1300 ℃ 的条件下，未涂层合金在 10 小时内出现了灾难性的质量损失。相比之下，有涂层的样品在 1300 °C 温度下经过 50 小时后质量损失极小，在循环热负荷下经过 300 次循环后仅观察到轻微的质量增加。微观结构分析表明，电弧熔化样品和 LPBF 样品之间存在明显差异，后者显示出超细树枝状微观结构。即使在高温条件下，涂层也能有效阻止氧气扩散到基体中，显示了其保护能力。在循环测试中，涂层表现出一种自愈机制，裂缝被硼硅填充，从而延长了耐环境性。

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来源期刊

Oxidation of Metals 工程技术-冶金工程

CiteScore

5.10

自引率

9.10%

发文量

审稿时长

2.2 months

期刊介绍： Oxidation of Metals is the premier source for the rapid dissemination of current research on all aspects of the science of gas-solid reactions at temperatures greater than about 400˚C, with primary focus on the high-temperature corrosion of bulk and coated systems. This authoritative bi-monthly publishes original scientific papers on kinetics, mechanisms, studies of scales from structural and morphological viewpoints, transport properties in scales, phase-boundary reactions, and much more. Articles may discuss both theoretical and experimental work related to gas-solid reactions at the surface or near-surface of a material exposed to elevated temperatures, including reactions with oxygen, nitrogen, sulfur, carbon and halogens. In addition, Oxidation of Metals publishes the results of frontier research concerned with deposit-induced attack. Review papers and short technical notes are encouraged.