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主管单位 中华人民共和国
工业和信息化部
主办单位 中国材料研究学会
哈尔滨工业大学
主编 苑世剑 国际刊号ISSN 1005-0299 国内刊号CN 23-1345/TB

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引用本文:宋佳星,方向,郭涛,丁文,姚淼,王浩,张晓南.同步热分析法研究超级铝热剂Al/MnO2的热安定性[J].材料科学与工艺,2019,27(2):64-69.DOI:10.11951/j.issn.1005-0299.20170245.
SONG Jiaxing,FANG Xiang,GUO Tao,DING Wen,YAO Miao,WANG Hao,ZHANG Xiaonan.Study on thermal stability of superthermite Al/MnO2 by simultaneous thermal analysis[J].Materials Science and Technology,2019,27(2):64-69.DOI:10.11951/j.issn.1005-0299.20170245.
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同步热分析法研究超级铝热剂Al/MnO2的热安定性
宋佳星,方向,郭涛,丁文,姚淼,王浩,张晓南
(陆军工程大学 野战工程学院,南京 210007)
摘要:
为研究超级铝热剂Al/MnO2的热安定性,利用水热法制备纳米级MnO2,采用透射电子显微镜(TEM)对纳米Al粉的氧化层厚度进行表征,计算出Al粉中纯Al的质量分数,从而确定更优配比.采用超声共混法制备得到超级铝热剂Al/MnO2,利用X射线衍射技术(XRD)和场发射扫描电子显微镜(FE-SEM)对超级铝热剂Al/MnO2的晶型和形貌进行表征,采用热重-差示扫描同步热分析技术(TG-DSC)在不同升温速率条件下研究了超级铝热剂Al/MnO2的非等温热行为,通过微分Kissinger法和积分Ozawa法计算样品的活化能,对活化能计算结果进行对比.结果表明:水热法制备得到的纳米级MnO2呈短棒状,晶型为α型,球状Al粉氧化层厚度约5 nm,纯Al质量分数约64.5%,超级铝热剂Al/MnO2铝热反应的温度区间为540~570 ℃,放热量约930 J/g;利用Kissinger法和Ozawa法拟合相关性较高,计算得到的活化能分别为429.1和421.9 kJ/mol.两种方法计算得到的活化能结果相近且数值较高,表明超级铝热剂Al/MnO2具有较好的热安定性,安全性能良好.
关键词:  超级铝热剂  同步热分析  热安定性  动力学  活化能
DOI:10.11951/j.issn.1005-0299.20170245
分类号:YQ567.7
文献标识码:A
基金项目:国家自然科学基金资助项目(51673213).
Study on thermal stability of superthermite Al/MnO2 by simultaneous thermal analysis
SONG Jiaxing, FANG Xiang, GUO Tao, DING Wen, YAO Miao, WANG Hao, ZHANG Xiaonan
(College of Filed Engineering, Army Engineering University, Nanjing 210007, China)
Abstract:
For the study of the thermal stability of superthermite Al/MnO2, nano-MnO2 was prepared by hydrothermal method. In order to determine optimal matching, oxide layer thickness of nano-Al powder was characterized through Transmission electronic microscopy (TEM). Then, superthermite Al/MnO2 was obtained by using ultrasonic method. The superthermite was characterized through X-ray diffraction (XRD) and Field emission scanning electron microscope (FE-SEM), and the nonisothermal behavior of the superthermite was studied by using thermogravimetric-differential scanning thermal analysis (TG-DSC) at different heating rates. The activation energy of the superthermite was comparatively calculated by Kissinger method and integral Ozawa method. Results show that the microstructure of nano-MnO2 was short rod and the crystal was α. Oxide layer thickness of spherical nano-Al powder was about 5 nm, namely, the content of pure Al was about 64.5%. The temperature range of the thermite reaction was between 540~570 ℃ and the heat release was about 930 J/g. Both methods had high fitting correlation that the activation energies obtained by Kissinger method and Ozawa method were 429.1 kJ/mol and 421.9 kJ/mol, respectively. The similar calculation results proved that the supertherimite Al/MnO2 has good thermal stability and safety performance.
Key words:  superthermite  TG-DSC  thermal stability  kinetics  activation energy

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