东北大学学报(自然科学版) ›› 2024, Vol. 45 ›› Issue (3): 415-421.DOI: 10.12068/j.issn.1005-3026.2024.03.014

• 资源与土木工程 • 上一篇    下一篇

Al/Fe2O3铝热剂粉尘着火敏感性

李刚1(), 马艳英1, 刘宗阳1, 南相莉2   

  1. 1.东北大学 资源与土木工程学院,辽宁 沈阳 110819
    2.东北大学 冶金学院,辽宁 沈阳 110819
  • 收稿日期:2022-10-07 出版日期:2024-03-15 发布日期:2024-05-17
  • 通讯作者: 李刚
  • 作者简介:李 刚(1969-),男,河南信阳人,东北大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(52274180);中央高校基本科研业务费专项资金资助项目(N180701011)

Ignition Sensitivity of Al/Fe2O3 Thermite Dust

Gang LI1(), Yan-ying MA1, Zong-yang LIU1, Xiang-li NAN2   

  1. 1.School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China
    2.School of Metallurgy,Northeastern University,Shenyang 110819,China.
  • Received:2022-10-07 Online:2024-03-15 Published:2024-05-17
  • Contact: Gang LI
  • About author:LI Gang,E-mail: ligang@mail.neu.edu.cn

摘要:

为明确铝热剂反应的着火特性,利用最低着火温度(minimum ignition temperature,MIT)和最小点火能(minimum ignition energy,MIE)测试装置,结合TG-DSC方法对4种Al粉与Fe2O3质量比为1∶4,1∶3,1∶2,1∶1的层状和云状Al/Fe2O3铝热剂进行了着火敏感性研究.结果表明,4种配比试样的粉尘层、粉尘云MIT均超出相关标准常规测试范围,在空气中质量比为1∶3铝热剂的反应触发温度为888 ℃,活化能为248.49 kJ/mol,说明铝热反应不容易触发;相同质量比的Al/Fe2O3粉尘云的MIE远高于粉尘层,层状MIE最低值为0.7 J,着火敏感性较强,这是因为Fe2O3在粉尘云状态的反应中充当惰化剂,而在粉尘层状态反应中为反应提供了活性氧自由基.

关键词: Al/Fe2O3铝热剂, 铝热反应, 粉尘层, 粉尘云, 着火敏感性

Abstract:

In order to determine the ignition characteristics of thermite, the ignition sensitivity of four layered and cloud Al/Fe2O3 thermite with mass ratio of Al and Fe2O3(1∶4,1∶3,1∶2,1∶1) was studied by using the minimum ignition temperature (MIT) and minimum ignition energy(MIE) test device combined with TG?DSC method. The results show that the MIT of dust layer and dust cloud for 4 kinds of matching samples exceed the conventional test range specified in relevant standards, the triggering temperature of thermite with the mass ratio of 1∶3 in the air is 888 ℃ and the activation energy is 248.49 kJ/mol, indicating that thermite reaction is not easy to trigger. The MIE of Al/Fe2O3 dust cloud with the same mass ratio is much higher than that of the dust layer, and the minimum MIE of the laminar is 0.7 J, indicating a higher ignition sensitivity. This is because Fe2O3 acts as an inerting agent in the reaction within the dust cloud state, and provides active oxygen species for the reaction within the dust layer state.

Key words: Al/Fe2O3 thermite, thermite reaction, dust layer, dust cloud, ignition sensitivity

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