Superior anti-oxidation performance of Ga-Al alloy on tungsten wire based on in-situ induced self-healing mechanism

IF 4.6 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xiangjun Deng , Kaijun Wang , Yunping Li , Nanlin He , Yafei Wang , Junkai Li , Jiangfeng Mou , Weijun Zhang , Feng Liu , Jin Hu
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引用次数: 0

Abstract

The service life of tungsten wires in an atmospheric environment is not ideal since the tungsten wires were prone to oxidation when electrified in the air. As a novel coating material to fabricate high-temperature anti-oxidation coatings on the surface of tungsten wires, liquid gallium‑aluminum alloy (Ga-Al) was developed by the simple method of melting metallic gallium and aluminum foil. After a brief period of electrical heating, an outer layer of Al2O3 was generated by the oxidation of Ga-Al alloy coating, and finally formed a bilayer composite coating containing Al2O3 and liquid metallic Ga-Al on the surface of tungsten wire. The outer Al2O3 layer not only effectively prevents the tungsten wire from oxidation, but also ensures the secure containment of the internal Ga-Al liquid metal. The inner layer of liquid metallic Ga-Al effectively solves the mismatch in the coefficient of thermal expansion (CTE) between Al2O3 and the substrate, significantly enhancing the integrity of the coating. Besides, the internal can regenerate a new protective Ga2O3 cover based on the self-healing mechanism of liquid metal, even when the outer Al2O3 layer fractures. Consequently, the Ga-Al composite coating significantly prolongs the service life of tungsten wires from 16 min to more than 24 h in an atmospheric environment. The efficient dual antioxidant strategy, namely the formed Al2O3 layer and the self-healing Ga-Al liquid metal, was first proposed as a novel approach to prevent the oxidation of tungsten wires.
基于原位诱导自愈机制的钨丝上Ga-Al合金优异的抗氧化性能
由于钨丝在空气中带电容易氧化,因此在大气环境中使用寿命不理想。采用金属镓与铝箔熔炼的简单方法,研制出了一种新型的用于钨丝表面高温抗氧化涂层的液态镓铝合金(Ga-Al)。经过短暂的电加热后,Ga-Al合金涂层氧化生成外层Al2O3,最终在钨丝表面形成含有Al2O3和液态金属Ga-Al的双层复合涂层。外层的Al2O3层不仅有效地防止了钨丝的氧化,而且保证了内部的Ga-Al液态金属的安全密封。液态金属Ga-Al的内层有效地解决了Al2O3与基体之间热膨胀系数(CTE)不匹配的问题,显著提高了涂层的完整性。此外,即使在外层Al2O3层断裂时,内部也能基于液态金属的自愈机制再生出新的保护性Ga2O3层。因此,在大气环境下,Ga-Al复合涂层显著延长了钨丝的使用寿命,从16分钟延长到24小时以上。本文首次提出了有效的双抗氧化策略,即形成的Al2O3层和自修复的Ga-Al液态金属,作为防止钨丝氧化的新方法。
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来源期刊
CiteScore
7.00
自引率
13.90%
发文量
236
审稿时长
35 days
期刊介绍: The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.
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