燃烧
材料科学
热导率
复合材料
点火系统
纳米复合材料
混合氧化物燃料
热分解
自燃温度
铝热剂
沸腾
沸点
化学工程
热力学
冶金
化学
有机化学
工程类
物理
铝
铀
作者
Wenchao Zhang,Kunyu Xiong,Zhimin Fan,Yao Shu,Peijin Liu,Qi‐Long Yan,Wen Ao
标识
DOI:10.1016/j.ast.2023.108263
摘要
The combustion of metastable intermixed composites (MICs) containing fluoropolymers is yet still not well understood. In this study, five new Al/MOX/PVDF nanocomposites (MOX: WO2, WO3, CuO, Fe2O3, Bi2O3) are prepared using a high-energy ball milling method. The thermal decomposition behaviors, combustion characteristics, and combustion products of the MICs are compared using TG-DSC, laser ignition test, and a multifunctional combustion diagnostic system. It is proved that PVDF efficiently promotes the energy release of conventional thermites. All five composites show a higher heat of reaction than Al/MOX in an argon environment by over 30%. Al/WO3/PVDF has the fastest combustion propagation speed in the confined combustor (72.5 mm⋅s−1). Due to the low boiling temperature and low thermal conductivity of the product, Al/Bi2O3/PVDF exhibits the lowest ignition delay (62 ms), the best pressure output performance (27.5 MPa⋅s−1), and the least product agglomeration (D43 = 15.2 μm). Due to the highest heat of reaction (3829 J⋅g−1), Al/CuO/PVDF has the highest flame temperature (2544 °C). The combustion flame temperature of Al/MOX/PVDF nanocomposites is suggested to be controlled by the heat of reaction, the ignition delay is mainly controlled by the thermal conductivity of the material, and the main factor affecting the high pressure output is the boiling point of the combustion products. This study can provide a theoretical basis for the development and application of MICs.
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