Abstract

Mn/Al/B mixed powders were used as raw material for the thermal explosion reaction in a tubular furnace to rapidly prepare Mn₂AlB₂ ceramics with high content at low temperature. The effects of raw material ratio, raw material particle size, and NaCl additives on the synthesis of Mn₂AlB₂ were studied systematically. The formation mechanism of Mn₂AlB₂ was proposed. The thermal explosion reaction was induced when the preheating temperature was approximately 686.9°C. The materials with MnB, Al, and Mn₂AlB₂ were synthesized as main phases. Mn₂B and AlMn_x were obtained in small amounts. Increasing the content of Al or refining the Mn and B size in the raw material reduced the content of MnB and other impurities in the product significantly, thereby promoting the synthesis of Mn₂AlB₂. The thermal explosion products were porous, and the sintering degree was weak. Many lathed Mn₂AlB₂ grains with an approximate size of 4 μm were obtained. A mechanism for the thermal explosion synthesis of Mn₂AlB₂ was proposed.

中文翻译：

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热爆炸法制备Mn2AlB2材料

摘要

以Mn/Al/B混合粉体为原料，在管式炉中进行热爆炸反应，在低温下快速制备高含量Mn ₂ AlB _2陶瓷。系统研究了原料配比、原料粒径和NaCl添加剂对Mn ₂ AlB ₂合成的影响。_{提出了Mn 2} AlB ₂的形成机理。当预热温度约为686.9℃时引发热爆炸反应。以MnB、Al和Mn ₂ AlB ₂为主要相合成材料。Mn ₂ B 和 AlMn _x获得了少量。提高原料中Al含量或细化Mn和B尺寸，可显着降低产物中MnB等杂质的含量，从而促进Mn ₂ AlB ₂的合成。热爆产物为多孔质，烧结度较弱。获得了许多尺寸约为 4 μm 的车削 Mn ₂ AlB _{2晶粒。提出了Mn 2} AlB ₂的热爆炸合成机理。