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低冲击压力下钕铁硼磁体冲击去磁规律研究

发表时间:2015-08-15  浏览量:1402  下载量:566
全部作者: 李川,伍俊英,陈朗,李生才,鲁峰
作者单位: 北京理工大学爆炸科学与技术国家重点实验室
摘 要: 为研究钕铁硼磁体在低冲击压力作用下的冲击去磁规律,建立气炮驱动飞片冲击去磁脉冲功率源实验装置,进行冲击去磁实验,获取了不同飞片速度下的感生电动势和磁能量改变量的变化曲线。数值模拟计算飞片冲击钕铁硼磁体过程,获得了磁体的入射冲击波压力及传播规律。研究结果表明,随着飞片速度的增加,入射冲击波压力越大,钕铁硼磁体的冲击去磁率越高。当入射冲击波压力接近7.45 GPa时,磁体几乎完全去磁。钕铁硼磁体发生完全去磁的临界压力应在3~7 GPa之间。
关 键 词: 爆炸力学;钕铁硼;冲击去磁;冲击波;脉冲功率源
Title: Research on shock wave demagnetization of Nd2Fe14B hard ferromagnetic at low shock wave pressure
Author: LI Chuan, WU Junying, CHEN Lang, LI Shengcai, LU Feng
Organization: State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology
Abstract: To study the shock wave demagnetization laws of Nd2Fe14B under low shock wave pressure, the flyer driven by a light gas gun loading Nd2Fe14B experimental device was designed and the shock wave demagnetization experiments were conducted. The induced electromotive force and magnetic flux losses were obtained. The processes of the flyer loading Nd2Fe14B were simulated. The shock wave pressures and their change laws were also obtained. The results show that initial shock wave pressure of Nd2Fe14B would be higher with the increase of the flyer velocity, which results in the higher demagnetization rate of Nd2Fe14B. When the initial shock wave pressure is closed to 7.45 GPa, Nd2Fe14B would be completely demagnetized. The critical pressure of serious demagnetization of Nd2Fe14B should be between 3-7 GPa.
Key words: explosion mechanics; Nd2Fe14B ferromagnetic; shock wave demagnetization; shock wave; pulsed power source
发表期数: 2015年8月第15期
引用格式: 李川,伍俊英,陈朗,等. 低冲击压力下钕铁硼磁体冲击去磁规律研究[J]. 中国科技论文在线精品论文,2015,8(15):1649-1654.
 
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