DYMAT 2009 (2009) 1189-1194
DOI: 10.1051/dymat/2009167

Shock properties of Nd₂Fe₁₄B material and design for shock-driven pulsed power source

M. Chuan-Min¹, S. Shang-Chun¹, L. Qiao-yan², H. Hong-Liang¹, Z. Wen-Jun¹ and Z. Feng<sup>1

1</sup>  National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics(CAEP), 621900 Mianyang, China
²  Institute of High temperature and High Pressure Physics, Sichuan University Chengdu, 610065 Sichuan Province, China

Published online: 15 September 2009

Abstract
Shock properties of Nd₂Fe₁₄B magnet were measured in the shock pressure range of 19 ~ 78 GPa by employing the two-stage light gas gun. Hugoniot data of Nd₂Fe₁₄B with initial average density 7.35 g/cm³ are obtained by the impedance matching method. The experimental results show a linear relationship between shock velocity and mass velocity. Based on the technique of explosive-driven demagnetization, a pulsed power source has been designed. With the Φ40 mm × 20 mm × 10 mm cylindrical magnet, the maximum output voltage and current reaches respectively 125.5 volts and 862.9 A. The rise time of the front edge of output voltage is about 264 ns. On the 0.05 Ω simulative load, the net power is 37 kW. Several formulas have been deduced in order to predict some important properties of the power source.

© EDP Sciences 2009