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采用挥发性添加剂将复合材料和金属相结合
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Several composite reactive materials of powdered Aluminum (Al) combined with a volatile additive, such as iodine, iodoform, or cyclooctane, were prepared by mechanical milling at cryogenic temperatures. Room temperature milling was also explored by combining Aluminum-Boron (Al-B) alloy with iodine. Initial thermo-gravimetric measurements show that the volatile components remain in the prepared materials at higher temperatures than known compounds, i.e., iodides, decompose. Such materials are of interest as additives to energetic formulations in propellants, explosives, and pyrotechnics. The presence of volatile components can affect ignition and combustion of the resulting energetic formulations. Changing the nature and amount of the additive enables one to customize the formulation, e.g., achieve biocidal effects for explosives or improve mixing of reactive particles with surrounding environment for propellants and pyrotechnics. The nature of a bond achieved by cryogenic milling between the volatile additives and metal is not understood; decomposition and oxidation of these new materials must be characterized and described quantitatively in order to predict their behavior in practical systems. In this project, thermo-gravimetric measurements were performed to study both heat induced release of volatile additives and oxidation when the prepared materials are heated respectively in inert and oxidizing environments. For each reaction, multi-step mechanisms are identified and the kinetics for each step along with activation energies are determined using Kissinger analysis. An extrapolation of the measured kinetic trends to the range of high heating rates characteristic of ignition enables one to identify ignition mechanism for the prepared materials. It is observed that release of iodine stabilized in the metal matrix upon its heating triggers ignition of the prepared aluminum-iodine and aluminum-iodoform composite materials. |
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- 附件 1 : 采用挥发性添加剂将复合材料和金属相结合.pdf
2017-02-24 16:50:19, 354.16 K
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