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在热爆炸模式下从Mo-Al-B混合物中合成MAB阶段的阶段形成过程中

Artem Yu Potanin¹, Evgeny A Bashkirov¹, Dmitry Yu Kovalev²

¹National University of Science and Technology "MISIS", Leninsky Prospect 4, bldg. 1, 119049 Moscow, Russia.

Materials (Basel, Switzerland)

|March 13, 2024

概括

对Mo-Al-B粉末混合物的制备方法显著影响合成,影响燃烧温度和反应机制. 然而,无论制备方法如何,MoAlB MAB的阶段产量仍然很高,尽管产品结构有所不同.

科学领域:

材料科学材料科学材料科学
化学工程是化学工程的重要组成部分.
固态化学固态化学

背景情况:

氧化 (MoAlB) 是一个具有潜在应用的MAX阶段.
自传,高温合成 (SHS) 是生产这种材料的可行途径.
控制合成参数对于优化材料性能至关重要.

研究的目的:

研究粉末混合物制备方法对SHS.通过MoAlB合成的影响.
分析对燃烧温度,反应机制和相位形成的影响.
描述合成的MoAlB的结构性质.

主要方法:

在热爆炸模式下进行自我传播的高温合成 (SHS).
使用旋转球磨和高速行星球磨来制备Mo-Al-B粉末混合物.
时间解析的X射线衍射 (TRXRD) 用于反应中间体的现场分析.
燃烧产品的微结构分析.

主要成果:

燃烧温度有很大的差异 (1234 °C用于旋转,992 °C用于行星削).
与MoAlB.一起确定了中间阶段 (Mo3Al8,α-MoB).
行星磨削导致固体相反应的重要性增加,并加速了相形成.
摩乙烯相位含量始终高 (92-94%),但微观结构不同.

结论:

粉末制备方法对MoAlB的SHS温度和反应途径产生了重大影响.
通过行星研磨的机械激活增强了反应动力学.
MoAlB MAB 阶段产量是稳固的,但微观结构是通过制备方法调整的,产生状结构.

关键词:

在MAB阶段,MAB阶段.在MoAlBBB中,它是最重要的.机械激活的机械激活自传播的高温合成 (SHS)热爆炸是一种热爆炸.时间解析的X射线衍射.

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