Ignition Sensitivity of Al/Fe2O3 Thermite Dust

doi:10.12068/j.issn.1005-3026.2024.03.014

Abstract

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

CLC Number:

X 932

Gang LI, Yan-ying MA, Zong-yang LIU, Xiang-li NAN. Ignition Sensitivity of Al/Fe₂O₃ Thermite Dust[J]. Journal of Northeastern University(Natural Science), 2024, 45(3): 415-421.

Figures/Tables 12

Table 1 Particle size distribution of Al and Fe2O3 powder

粉末	D₃	D₁₀	D₅₀	D₉₀	D₉₇	D_avg
Al	5.78	9.72	17.79	27.47	32.27	18.19
Fe₂O₃	0.75	1.36	4.93	23.88	44.27	9.50

Fig.1 Particle size distribution curves of aluminum

Fig.2 Test device of dust cloud minimum ignition energy

Fig.3 Test device of dust layer minimum ignition energy

Fig.4 Experimental phenomenon of minimum ignition energy of dust cloud with a mass ratio of Al powder

Fig.5 Al and Al/Fe2O3 dust cloud explosion pressure curves

Fig.6 Experimental results of minimum ignition energy of Al/Fe2O3 dust layer

Fig.7 Photo of product after fire of Al/Fe2O3 dust layer

Fig.8 Thermogravimetric analysis curves in air atmosphere

Fig.9 Thermogravimetric analysis curve in nitrogen atmosphere

Fig.10 Thermogravimetric analysis curves in argon atmosphere

Fig.11 Mechanism diagram of Al/Fe2O3 thermite reaction

References 20

1	Li Y X， Chen C， Yi R X，et al.The brazing of Al₂O₃ ceramic and other materials［J］.The International Journal of Advanced Manufacturing Technology，2022，120（1/2）：59-84.
2	Yuan Y， Fan J Y， Li J S，et al.Oscillatory pressure sintering of Al₂O₃ ceramics［J］.Ceramics International，2020，46（10）：15670-15673.
3	Huang J S， Liao Q L， Wang F，et al.Synthesis of Fe‐doped alumina transparent ceramics by co‐precipitation and vacuum sintering［J］.Ceramics International，2018，44（1）：799-804.
4	安全执法和工贸监管局.关于宁夏银川大多天盛金属陶瓷技术有限公司“6·28”较大爆炸事故情况的通报［R］.衢州：衢州市应急管理局，2021.
	Security Law Enforcement and Industry and Trade Supervision Bureau.Announcement on the “6·28” large explosion accident of Ningxia Yinchuan Most Tiansheng Metal Ceramics Technology Co.，Ltd.［R］.Quzhou：Quzhou Emergency Management Bureau，2021.
5	Wang Y.Preparation of the high temperature resisting material with Al‐CrO₃ system by SHS［J］.Advanced Materials Research，2013，690/691/692/693：334-337.
6	Chen C G， Shi T， Wang W W，et al.Characterization and integrated fabrication of Al components with thick TiC_p/Al composite coatings via self‐propagating reaction［J］.Journal of Materials Engineering and Performance，2019，28：4485-4495.
7	Hou X H， Yu J K.Phase and structure formation mechanisms of SHS synthesized composite coatings［J］.Ceramics International，2018，44（7）：8012-8017.
8	Averill A F， Ingram J M， Battersby P，et al.Ignition of flammable hydrogen/air mixtures by mechanical stimuli. part 2：ignition under conditions of rust and surface pyrophoric material contamination［J］.International Journal of Hydrogen Energy，2015，40（12）：4392-4400.
9	Seyed E S， Ramin R， Jalil V K，et al.A self‐propagating high‐temperature synthesis process for the fabrication of Fe（Cr）‐Al₂O₃ nanocomposite［J］.International Journal of Minerals Metallurgy and Materials，2019，26（6）：775-786.
10	Park Y J， Seo S H， Jang S W，et al.Investigation of shear‐induced exothermic thermite reaction in Al‐Fe₂O₃ epoxy cast composites［J］.Combustion Science and Technology，2016，188（6）：895-909.
11	Yang H F， Xu C H， Man S S，et al.Effects of hollow carbon nanospheres on combustion performance of Al/Fe₂O₃‐based nanothermite sticks［J］.Journal of Alloys and Compounds，2022，918：165684.
12	贾栓柱，甄建伟，杜仕国，等.多种铝热剂复配设计及其热性能［J］.装甲兵工程学院学报，2018，32（1）：66-71.
	Jia Shuan‐zhu， Zhen Jian‐wei， Du Shi‐guo，et al.Compound design and its thermal property of multiple tHermite［J］.Journal of Academy of Armored Force Engineering，2018，32（1）：66-71.
13	Azimi‐Roeen G， Kashani‐Bozorg S F， Nosko M，et al.Reactive mechanism and mechanical properties of in situ hybrid nano‐composites fabricated from an Al‐Fe₂O₃ system by friction stir processing［J］.Materials Characterization，2017，127：279-287.
14	Kesiany M， Marcelo J S.Detailed numerical modeling and simulation of Fe₂O₃‐Al thermite reaction［J］.Propellants，Explosives，Pyrotechnics，2021，46（5）：806-824.
15	Lin L Z， Cheng X L， Ma B.Reaction characteristics and iron aluminides products analysis of planar interfacial Al/α‐Fe₂O₃ nanolaminate［J］. Computational Materials Science，2017，127：29-41.
16	叶大伦，胡建华.实用无机物热力学数据手册［M］.2版.北京：冶金工业出版社，2002.
	Ye Da‐lun， Hu Jian‐hua.Handbook of practical inorganic thermodynamic data［M］.2nd ed.Beijing：Metallurgical Industry Press，2002.
17	Valeeva A K， Imayev M F.Evaluation of the thermodynamic possibility of in situ composites fabrication in aluminum‐metal and aluminum‐metal oxide systems through friction stir processing［J］.Letters on Materials，2021，11（4）：544-547.
18	刘金香，郑全勤，高秀英.由热重数据计算动力学参数［J］.化学学报，1983，41（2）：169-175.
	Liu Jin‐xiang， Zheng Quan‐qin， Gao Xiu‐ying.Calculation of kinetic parameters from thermogravimetric data［J］.Acta Chimica Sinica，1983，41（2）：169-175.
19	Song J X， Guo T， Yao M，et al.A comparative study of thermal kinetics and combustion performance of Al/CuO，Al/Fe₂O₃ and Al/MnO₂ nanothermites［J］.Vacuum，2020，176：109339.
20	Zhou L， Piekiel N， Chowdhury S，et al.Time‐resolved mass spectrometry of the exothermic reaction between nanoaluminum and metal oxides：the role of oxygen release［J］.The Journal of Physical Chemistry C，2010，114（33）：14269-14275.

[1]	CHEN Yang-yang， MENG Fan-yi， CAI Jing-zhi， YUAN Chun-miao. Enhanced Mechanism of Metal Oxides on the Fire Spread of Magnesium Dust Layer [J]. Journal of Northeastern University(Natural Science), 2023, 44(12): 1778-1784.
[2]	YU Li-fu， LI Gang， PAN Chao， YUAN Chun-miao. Experimental Research on China’s Oil Shale Dust Explosibility [J]. Journal of Northeastern University Natural Science, 2016, 37(8): 1203-1206.
[3]	YANG Hong-xia， LI Gang， YUAN Chun-miao， YU Li-fu. Theoretical Model and Experimental Study on the Ignition of Oil Shale Dust Layer [J]. Journal of Northeastern University Natural Science, 2016, 37(12): 1768-1771.
[4]	LI Xin-guang， ZHONG Sheng-jun， LI Wei-ye， WEI Yu-long. Accurate Control System of Spark Discharge Energy [J]. Journal of Northeastern University Natural Science, 2015, 36(2): 162-165.

Ignition Sensitivity of Al/Fe₂O₃ Thermite Dust

RichHTML

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 12

References 20

Related Articles 4

Recommended Articles

Metrics

Comments