| 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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| 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). |
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| Study on thermal stability of superthermite Al/MnO2 by simultaneous thermal analysis |
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SONG Jiaxing, FANG Xiang, GUO Tao, DING Wen, YAO Miao, WANG Hao, ZHANG Xiaonan
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(College of Filed Engineering, Army Engineering University, Nanjing 210007, China)
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| 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 |
