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Preparation of Isotropic and Anisotropic Nanocrystalline NdFeB Magnets by High-Velocity Compaction and Hot Deformation

机译:高速压实和热变形制备各向同性和各向异性的纳米钕铁硼磁体

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摘要

NdFeB powders are consolidated into nanocrystalline bulk magnets by a near-net-shape process of high-velocity compaction (HVC) at room temperature with no binder employed. The magnets prepared under various conditions, including impact energy, filling weight, mold dimension, and plasticity and size of the starting powders, were investigated. The results showed that the density of as-compacted NdFeB magnets increased with the increasing impact energy and decreasing filling weight. The as-compacted magnets with relatively high density can inherit the coercivity and microstructure of the starting powders. The small flake powders with good plasticity and/or large mold diameter are beneficial to obtain high density. The relative green densities for the samples with low-Nd composition and high-Nd composition reach 92% and 87.5%, respectively. Using the HVCed magnet as the precursor, the anisotropic NdFeB magnets with enhanced magnetic properties have been prepared by hot deformation. This paper provides an alternative technique for preparing nanocrystalline NdFeB magnets.
机译:NdFeB粉末在室温下通过高速压实(HVC)的近净形过程被固结成纳米晶体块状磁体,而无需使用粘合剂。研究了在各种条件下制备的磁体,包括冲击能,填充重量,模具尺寸以及起始粉末的可塑性和尺寸。结果表明,随着冲击能量的增加和填充重量的减小,致密NdFeB磁体的密度增加。压缩后的密度较高的磁体可以继承起始粉末的矫顽力和微观结构。具有良好可塑性和/或较大模具直径的小片状粉末有利于获得高密度。低Nd组成和高Nd组成的样品的相对绿色密度分别达到92%和87.5%。使用HVCed磁体作为前驱体,已经通过热变形制备了具有增强磁性能的各向异性NdFeB磁体。本文提供了另一种制备纳米晶NdFeB磁体的技术。

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