Abstract—

We have studied the spontaneous comminution of cast materials consisting of a Mn-doped Cr₂AlC MAX phase and chromium, manganese, and aluminum carbides and aluminides. The materials were prepared in the form of ingots by self-propagating high-temperature synthesis (SHS) in a 3-L reactor at an argon pressure p = 5 MPa. The starting mixtures consisted of manganese(IV) oxide, chromium(III) oxide, aluminum (ASD-1), and carbon. The presence of aluminum carbide (Al₄C₃) in a cast material has been shown to lead to spontaneous comminution of the cast material (without mechanical or chemical influences) into powders with a crystalline particle size under 100 μm. The particle size reduction has been shown to result from reaction between aluminum carbide and atmospheric moisture. The synthesized materials have been characterized by X-ray diffraction and X-ray microanalysis, and we have studied structural and phase states of particles of the desired products obtained as a result of self-comminution of a cast SHS material.

中文翻译：

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Mn-Cr-Al-C体系自蔓延高温合成铸造材料的粉碎

摘要-

我们研究了由掺杂 Mn 的 Cr ₂ AlC MAX 相和铬、锰、铝的碳化物和铝化物组成的铸造材料的自发粉碎。在氩气压力p = 5 MPa下，通过自蔓延高温合成 (SHS) 在 3 升反应器中以锭的形式制备材料。起始混合物由氧化锰 (IV)、氧化铬 (III)、铝 (ASD-1) 和碳组成。碳化铝（Al ₄ C ₃) 已被证明会导致铸造材料（没有机械或化学影响）自发粉碎成结晶粒度低于 100 μm 的粉末。已显示颗粒尺寸减小是由碳化铝和大气水分之间的反应引起的。合成的材料已通过 X 射线衍射和 X 射线微量分析进行表征，我们研究了由于铸造 SHS 材料的自粉碎而获得的所需产品颗粒的结构和相态。