Improvement of the coercivity and corrosion resistance of the Nd-Fe-B sintered magnets by Al nano-particles doped
首发时间:2012-03-09
Abstract:Nd-Fe-B permanent magnets with a small amount of Al nano-particles doping were prepared by conventional sintered method. Effect of Al content on magnetic property, corrosion resistance and oxidation properties of the magnets were studied. Investigation shows that the coercivity rises gradually, while the remanence decreases simultaneously with increase of Al doping amount. Further investigation reveals that most Al element enriches mainly into the main phase and some Al element distributes into the Nd-rich phase. The autoclave test results show that the corrosion rate of the magnets decrease with the Al content increases. After oxidation, the maximum energy product losses of the magnets with 0.0 wt. % and 0.2 wt. % Al nano-particles doping are 6.13% and 3.99%, respectively. It is, therefore, Al nano-particles doping are a promising way to enhance the coercivity and corrosion resistance of sintered Nd-Fe-B magnet.
keywords: Nd-Fe-B coercivity corrosion resistance Al nano-particles
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铝纳米颗粒掺杂制备高矫顽力和高耐蚀性烧结Nd-Fe-B磁体
摘要:采用传统方法制备了铝纳米颗粒掺杂烧结Nd-Fe-B磁体,研究了铝含量对磁体的磁性能、腐蚀性能和氧化性能的影响。研究结果表明随着铝含量的增加,磁体的矫顽力大幅提升,剩磁降低。显微组织结果表明大部分铝富集在主相中,部分的铝分布在富Nd相中。在高压加速腐蚀实验中,腐蚀速率随铝含量增加而降低。磁体经200℃197h氧化后, 0.0 wt. %和0.2 wt. % 铝纳米颗粒掺杂磁体的最大磁能积分别降低了6.13%和3.99%。以上结果表明铝纳米颗粒掺杂可以有效的提高烧结Nd-Fe-B磁体的矫顽力、腐蚀性能和氧化性能。
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