热爆反应制备Fe_(2)AlB_(2)材料  

Preparation of Fe_(2)AlB_(2) Material Via Thermal Explosion From Fe/Al/B System

作　　者：韩警贤 刘嘉霖 HAN Jingxian;LIU Jialin(College of Intelligent Manufacturing,Zhengzhou Technical College,Zhengzhou 450010,China;Institute of Electrical and Mechanical,Zhongyuan University of Technology,Zhengzhou 450007,China)

机构地区：[1]郑州职业技术学院智能制造学院,河南郑州450010 [2]中原工学院机电学院,河南郑州450007

出　　处：《材料科学与工程学报》2024年第5期832-838,共7页Journal of Materials Science and Engineering

基　　金：河南省教育厅重点项目((21A460036))。

摘　　要：本研究采用Fe/Al/B单质混合粉末为原料,进行热爆反应以合成高纯度Fe_(2)AlB_(2)材料。分别在管式炉和放电等离子烧结炉中发生热爆反应合成Fe_(2)AlB_(2)。在管式炉中发生热爆反应,由于Fe-Al体系的反致密化行为,以及Fe/Al/B体系的反应放热量低等原因,坯体在反应后被爆轰成粉末。这导致热爆反应被迫中止,原料没有反应完全。产物中含有大量的FeB、Fe 2B、FeAl、Fe 3Al和AlB 2等二元化合物,Fe_(2)AlB_(2)含量非常少。添加锡助剂,可以有效抑制产物粉末化,确保热爆反应的顺利进行,显著促进Fe_(2)AlB_(2)的合成。放电等离子体烧结可诱发热爆反应,从而实现高含量Fe_(2)AlB_(2)的反应合成及快速致密化。980℃时不保温,可得到主相为FeB和Fe_(2)AlB_(2)的试样。试样中Fe_(2)AlB_(2)块体材料的含量较高(含量为94.5 wt%)。最后,提出一个热爆反应合成Fe_(2)AlB_(2)的反应机制。A Fe_(2)AlB_(2) material with a high purity was synthesized through a thermal explosion reaction using Fe/Al/B mixed powders as raw materials.The synthesis of Fe_(2)AlB_(2) by the thermal explosion reaction in a tubular furnace and spark plasma sintering furnace was studied,respectively.The results indicated that the thermal explosion reaction occurred in the tubular furnace.However,due to the anti-densification behavior of the Fe-Al system and the low heat release of the Fe-Al-B system reaction,the green body might explode into powders after the reaction,leading to an incomplete reaction of raw materials.Accordingly,a large number of binary compounds such as FeB,Fe 2B,FeAl,Fe 3Al and AlB 2 were synthesized while the content of Fe_(2)AlB_(2) in the product remained very low.It was found that Sn additives could effectively inhibit and avoid powder formation during synthesis,ensuring successful progress of the thermal explosion reaction and significantly promoting the formation of Fe_(2)AlB_(2).Furthermore,spark plasma sintering could induce a thermal explosion reaction to achieve rapid densification and realize the synthesis with a high content of Fe_(2)AlB_(2).Without heat preservation at 980℃,sample with main phases consisting of FeB and Fe_(2)AlB_(2) could be obtained.The content of Fe_(2)AlB_(2) bulk material in the sample was high(94.5 wt%).Finally,a reaction mechanism for the synthesis of Fe_(2)AlB_(2) by thermal explosion reaction was presented.

关 键 词：热爆反应 Fe_(2)AlB_(2) 反致密化 SN 

分 类 号：TB333[一般工业技术—材料科学与工程]