高熵难熔金属硅化物(Mo 0.2 w 0.2 cr 0.2 ta 0.2 nb 0.2) si2完全消除害虫氧化

EngRN: Materials in Energy (Topic) Pub Date : 1900-01-01 DOI:10.2139/ssrn.3659825

Le Liu, Laiqi Zhang, Da Liu

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引用次数: 2

摘要

二硅化钼(MoSi2)是一种具有竞争力的超高温结构材料。然而，它遭受致命的低温氧化，这极大地限制了它的应用。为了解决这一问题，本文采用原位火花等离子体反应烧结的方法合成了一种新型高熵难熔金属硅化物，其组成为Mo0.2W0.2Cr0.2Ta0.2Nb0.2)Si2。在500°C下进行了300 h的间歇氧化试验，结果表明该材料在低温下具有优异的抗氧化性，无虫害现象。消除害虫氧化的机制是该材料的高熵抑制大块金属氧化物的生成，在氧化测试过程中只形成完整的SiO2膜。

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Complete Elimination of Pest Oxidation by High Entropy Refractory Metallic Silicide (Mo 0.2W 0.2Cr 0.2Ta 0.2Nb 0.2)Si 2

Molybdenum disilicide (MoSi₂) is a competitive ultra-high-temperature structural material. However, it suffered from a fatal low-temperature oxidation, which extremely limited its application. To solve this problem, a novel high entropy refractory metallic silicide with composition of Mo_0.2W_0.2Cr_0.2Ta_0.2Nb_0.2)Si₂ was synthesized by in-situ spark plasma reaction sintering in this work. The interrupted oxidation testings at 500 °C for 300 h have been performed, and shown that this material has an excellent oxidation resistance at low temperatures without pest phenomenon. The mechanism for eliminating pest oxidation is that the high entropy of this material would suppress generation of bulk metallic oxides with formation of only an intact SiO2 film during oxidation testing.

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EngRN: Materials in Energy (Topic)

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