Al/Fe_(2)O_(3)铝热剂粉尘着火敏感性  

Ignition Sensitivity of Al/Fe_(2)O_(3)Thermite

作　　者：李刚[1] 马艳英 刘宗阳 南相莉 Dust LI Gang;MA Yan-ying;LIU Zong-yang;NAN Xiang-li(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China;School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[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

出　　处：《东北大学学报（自然科学版）》2024年第3期415-421,438,共8页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(52274180,51874070);中央高校基本科研业务费专项资金资助项目(N180701011).

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Fe_(2)O_(3)质量比为1∶4,1∶3,1∶2,1∶1的层状和云状Al/Fe_(2)O_(3)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/Fe_(2)O_(3)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Fe_(2)O_(3)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.In order to determine the ignition characteristics of thermite,the ignition sensitivity of four layered and cloud Al/Fe_(2)O_(3)thermite with mass ratio of Al and Fe_(2)O_(3)(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/Fe_(2)O_(3)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 Fe_(2)O_(3)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.

关 键 词：Al/Fe_(2)O_(3)铝热剂 铝热反应 粉尘层 粉尘云 着火敏感性 

分 类 号：X932[环境科学与工程—安全科学]