约束电爆过程中石墨的纳米化机制

兰州理工大学学报 ›› 2020, Vol. 46 ›› Issue (3): 18-22.

约束电爆过程中石墨的纳米化机制

朱亮^1,2, 刘秋华¹, 王旭东¹

1.兰州理工大学材料科学与工程学院, 甘肃兰州 730050;
2.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 甘肃兰州 730050

收稿日期:2019-05-14 出版日期:2020-06-28 发布日期:2020-08-19
作者简介:朱亮(1964-),男,甘肃高台人,教授.
基金资助:
国家自然科学基金(51765038)

Nanocrystallization mechanism of graphite during constrained electric explosion

ZHU Liang^1,2, LIU Qiu-hua¹, WANG Xu-dong¹

1. College of Materials Science and Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech, Lanzhou 730050, China

Received:2019-05-14 Online:2020-06-28 Published:2020-08-19

摘要/Abstract

摘要： 利用自行研制的约束电爆石墨制备低维纳米碳装置,通过改变初始充电电压与约束管管径进行系列性电爆实验,实验中对气溶胶形式的电爆产物进行原位取样,并进行显微分析.结合电爆产物显微分析结果和约束管中能量密度与电爆产物粒径间的关系,对电爆过程中石墨的纳米化机制进行研究.研究结果表明:电爆过程中约束管内产生的机械压缩波能够对石墨施加瞬间高压使石墨碎化,这一压缩波在传播过程中对已碎化的石墨进行反复冲击与剥离,从而导致石墨颗粒从约束管中喷射而出.在喷射过程中,石墨颗粒之间以及石墨颗粒与约束管壁之间不断发生碰撞,致使石墨颗粒进一步碎化,并形成低维纳米碳.

关键词: 约束电爆, 石墨, 机械压缩波, 纳米化机制

Abstract: To prepare low-dimensional nano-carbon, a series of electric explosion tests were conducted with a self-developed constrained explosive graphite device by the changed initial charging voltages together with diameters of the constrained pipe. In the experiment, in-situ sampling and microscopic analysis were carried out successively for electro-explosion products in the form of aerosols. On this basis, nano-crystallization mechanism of graphite in the process of electric explosion was studied by combining the results of the microscopic analysis of the products and the relationship between the energy density and the particle size of the products. The results show that the mechanical compression are generated in the constraint tube can exert instantaneous high pressure on the graphite and make the graphite broken. The compression wave repeatedly impacts and peels the broken graphite off in its propagation process, which results in the graphite particles ejecting from the tube. During particle injection, the collision between the graphite particles as well as between the graphite particles and constraint tube wall occurs constantly, resulting in further fragmentation of the graphite particles and formation of low dimensional nano-carbon.

Key words: constrained electric explosion, graphite, mechanical compression wave, nano-crystallization mechanism

中图分类号:

TB44
TM89

朱亮, 刘秋华, 王旭东. 约束电爆过程中石墨的纳米化机制[J]. 兰州理工大学学报, 2020, 46(3): 18-22.

ZHU Liang, LIU Qiu-hua, WANG Xu-dong. Nanocrystallization mechanism of graphite during constrained electric explosion[J]. Journal of Lanzhou University of Technology, 2020, 46(3): 18-22.

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