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A new strategy to intrinsically protect refractory metal based alloys at ultra high temperatures
Corrosion Science ( IF 7.4 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.corsci.2020.108475
Bronislava Gorr , Franz Müller , Steven Schellert , Hans-Jürgen Christ , Hans Chen , Alexander Kauffmann , Martin Heilmaier

Abstract Poor oxidation resistance represents one of the main shortcomings of refractory metal based alloys. This work shows an innovative way to intrinsically protect such materials. Our approach relies on the alloying with Cr and Ta allowing the formation of CrTaO4. The CrTaO4 scale formed on the novel refractory equiatomic high entropy alloy Ta-Mo-Cr-Ti-Al reveals a unique combination of the following properties: (i) easy formation in a wide temperature range from 500 °C to 1500 °C, (ii) excellent adherence after cooling, (iii) low growth rates, and (iv) wide stability range of the stoichiometric composition that suppresses the formation of non-protective oxides.

中文翻译:

一种在超高温下本质上保护难熔金属基合金的新策略

摘要 耐氧化性差是难熔金属基合金的主要缺点之一。这项工作展示了一种从本质上保护此类材料的创新方法。我们的方法依赖于与 Cr 和 Ta 的合金化,从而形成 CrTaO4。在新型耐火等原子高熵合金 Ta-Mo-Cr-Ti-Al 上形成的 CrTaO4 鳞片显示出以下特性的独特组合:(i) 在 500 °C 至 1500 °C 的宽温度范围内容易形成,( ii) 冷却后优异的附着力,(iii) 低生长速率,以及 (iv) 化学计量组合物的广泛稳定性范围,可抑制非保护性氧化物的形成。
更新日期:2020-04-01
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