CHINESE JOURNAL OF ENERGETIC MATERIALS
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微米铝粉氧化铝壳增强及其抗氧化性能
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北京理工大学爆炸科学技术国家重点实验室,北京 100081

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国家自然科学基金项目(面上项目)


Alumina Shell Enhancement of Micron-sized Aluminum Powder and Its Anti-oxidized Properties
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State Key laboratory of Explosion Science and Technology, Beijing Institute of Technology,Beijing 100081, China

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    摘要:

    为增加壳核结构微米铝粉的抗氧化性能,利用同步热分析仪在氧气环境中以20 ℃·min-1的升温速率对4种不同粒度(2.51,5.20,13.35,24.02 μm)的微米铝粉缓慢加热至650 ℃,实现微米铝粉氧化铝壳的增强。用热重分析技术对处理前后微米铝粉缓慢加热条件下的热响应行为进行了研究,并利用扫描电镜,X射线衍射对不同阶段的氧化产物进行分析。结果表明,氧化铝壳增强处理后,微米铝粉的氧化铝壳从无定形态变为γ态,致密性增加,同时,4种微米铝粉样品的氧化铝壳厚度增加到原始厚度的3.3~5.9倍。在保持微米铝粉高活性的条件下,氧化铝壳的相变和增厚使得微米铝粉在低于1350 ℃的缓慢加热过程中不被氧化性环境氧化,仍保持较高活性,抗氧化性能大幅提高,微米铝粉的缓慢氧化反应机理从阶段性增重的破壳反应机理转变为氧化铝壳增强后的氧化反应抑制机理。

    Abstract:

    To increase the anti-oxidized properties of the micron-sized aluminum powder with shell-core structure, four kinds of micron-sized aluminum powder with different granularity(2.51, 5.20, 13.35, 24.02 μm)were slowly heated to 650 ℃ by a synchronous thermal analyzer at a heating rate of 20 ℃·min-1 in the oxygen atmosphere to realize the enhancement of the alumina shell of micron-sized aluminum powder. The thermal response behavior of micron-sized aluminum powder before and after treating in slowly heating condition was investigated by the thermogravimetric analysis technique. The oxidation products at different stages were analyzed by scanning electron microscopy(SEM)and X-ray diffraction(XRD). Results show that after the the alumina shell is strengthened, the alumina shell of the micron-sized aluminum powder changes from amorphous state to γ state and the compactness increases. At the same time, the thickness of alumina shell of four kinds of micron-sized aluminum powder samples increases to 3.3-5.9 times of the original thickness. Under the condition of maintaining the high activity of micron-sized aluminum powder, the phase change and thickening of the alumina shell make the aluminum powder do not oxidize in the oxidative environment during slowly heating process below 1350 ℃, still maintain higher activity and increase the antioxidized properties greatly. The mechanism of slow oxidation of the micron-sized aluminum powder is changed from"shell broken"reaction mechanism with weight gain in stages to oxidation inhibition mechanism after the the alumina shell is strengthened.

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引用本文

刘洋,焦清介,闫石,等.微米铝粉氧化铝壳增强及其抗氧化性能[J].含能材料, 2018, 26(8):664-670. DOI:10.11943/CJEM2017293.
LIU Yang, JIAO Qing-jie, YAN Shi, et al. Alumina Shell Enhancement of Micron-sized Aluminum Powder and Its Anti-oxidized Properties[J]. Chinese Journal of Energetic Materials, 2018, 26(8):664-670. DOI:10.11943/CJEM2017293.

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  • 收稿日期: 2017-09-13
  • 最后修改日期: 2018-06-12
  • 录用日期: 2018-05-23
  • 在线发布日期: 2018-05-30
  • 出版日期: 2018-08-23