VACUUM
·
2020
·
IF 2.906
Jiaxing Song,Tao Guo,Miao Yao,Jialin Chen,Wen Ding,Fengli Bei,Yiming Mao,Zhongshen Yu,Junyi Huang,Xiaonan Zhang,Qin Yin,Shuo Wang
The performance of energetic materials is mainly reflected in two aspects, thermal performance and combustion performance. To figure out the differences in reaction performance, in this paper, thermal and combustion properties of Al/CuO, Al/Fe 2 O 3 and Al/MnO 2 nanothermites were studied respectively by thermal analysis and fast heating wire experiments. According to the thermal analysis, the exothermic peak temperature points of Al/MnO 2 , Al/CuO, Al/Fe 2 O 3 nanothermites were 552.1 °C, 563.1 °C and 565.3 °C, respectively, while the sequence of activation energy calculated from low to high was Al/Fe 2 O 3 , Al/CuO, Al/MnO 2 nanothermites. By the way, the values of Al/CuO and Al/Fe 2 O 3 nanothermites showed little difference in temperature and activation energy. The ignition energy characterized by direct current had little difference among them, and the sequence from low to high was Al/MnO 2 , Al/Fe 2 O 3 , Al/CuO nanothermites, corresponding to 1.169 A, 1.214 A and 1.221 A, respectively. As for burning rate, Al/CuO burnt the fastest clearly while the Al/Fe 2 O 3 burnt the longest. In terms of combustion performance, Al/CuO and Al/MnO 2 were basically the same, with little splash of sparks, and the concentrations of combustion energy were better. The combustion phenomenon of Al/Fe 2 O 3 nanothermite was quite unique with a large number of scattered sparks and poor energy concentration. Finally, the intrinsic reasons for above different phenomena of these three nanothermites were analyzed and discussed.
研究领域:
材料科学
·
化学工程
·
燃烧科学
✓ 已验证
产品关联
DOI
高影响因子
Colloid and Interface Science Communications
·
2020
·
IF 2.831
Jiaxing Song,Tao Guo,Miao Yao,Jialin Chen,Wen Ding,Xiaonan Zhang,Fengli Bei,Junyi Huang
Graphene oxide (GO) with outstanding mechanical properties and high temperature stability is attractive to many researchers. As a flame retardant, GO also has been widely used in fire resistance applications of polymers. Herein, to explore ignition resistance effect of GO on nanothermite, GO/Al/MnO 2 nanocomposites were prepared. Due to the large specific surface area, GO can completely cover the surface of nanothermite components. Thermal results showed that exothermic thermite reaction occurred in the range of 500 °C to 600 °C while with GO addition, thermite reaction did not happen at all. Originally, combustion phenomenon of Al/MnO 2 nanothermite was intense with bright flame, but GO/Al/MnO 2 nanocomposites cannot be ignited even if the current on heating wires was higher. The physical barrier of GO hinders the direct contact between fuel and oxidizer which prevents the occurrence of self-propagating thermite reaction. This work provides guiding significance to the design of nanothermite flame retardant.
研究领域:
材料科学
·
燃烧化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 44
·25266-25273
·
IF 3.049
Jiaxing Song,Tao Guo,Wen Ding,Miao Yao,Fengli Bei,Xiaonan Zhang,Junyi Huang,Xiang Fang
To explore the effect of the addition of poly(vinylidene fluorine) (PVDF) to a nanothermite system, an Al/MnO2/PVDF energetic nanocomposite was prepared using an electrospray method, Al/MnO2 nanothermite was prepared as a control group. Then, the energetic nanocomposite and nanothermite were tested and analyzed by XRD, FE-SEM and TG-DSC, and the reaction products were collected. The results show that energetic nanocomposite would have three obvious exothermic peaks in the range of room temperature to 800 °C with a total more than 1700 J g−1 heat release while the control experiment, Al/MnO2 nanothermite, could be found one exothermic peak with a 1100 J g−1 heat release. The residues are mainly MnAl2O4, MnF2 and AlF3 which indicates that Al/MnO2/PVDF energetic nanocomposite could make full use of manganese oxide. Finally, thermal analysis experiments were carried out under different heating rates to calculate the activation energy. The calculation results show that the addition of PVDF could significantly reduce the activation energy, which would help spark the thermite at comparatively low energy and temperature.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）