Improvement of corrosion resistance and magnetic properties of Nd–Fe–B sintered magnets by Al85Cu15 intergranular addition
Improvement of corrosion resistance and magnetic properties of Nd–Fe–B sintered magnets by Al85Cu15 intergranular addition
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DOI：
10.1016/j.jallcom.2010.04.021
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发表时间：
2010-07
影响因子：
6.2
通讯作者：
J. Ni;T. Ma;X. Cui;Yehao Wu;M. Yan
中科院分区：
文献类型：
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作者：
J. Ni;T. Ma;X. Cui;Yehao Wu;M. Yan
为了提高耐蚀性和磁性能，Al 85 Cu 15（at.%）在（Pr，Nd）14.8Fe78.7B6.5烧结磁体中添加复合粉末作为晶界改性剂。添加少量Al 85 Cu 15粉末可显著提高合金的耐蚀性。当添加1.2wt%Al_（85）Cu_（15）时，磁体在潮湿环境中的腐蚀速率降低了两个数量级。这部分是由于Cu和Al增强了富（Pr，Nd）晶间相的稳定性，此外，开路电位高于富（Pr，Nd）晶间相的富Cu相（（Pr，Nd）22 Fe 56 Cu 10Al 2 O 10）的出现也可能是耐蚀性提高的另一个原因。此外，在（Pr，Nd）14.8Fe78.7B6.5合金中添加0.3- 1.2wt%Al 85 Cu 15，也能提高合金的磁性能。最佳添加量为0.6wt%。磁性能的改善可能与微结构的改性和磁体密度的增加有关。
To improve the corrosion resistance and magnetic properties, Al85Cu15(at.%) compound powders were added to (Pr, Nd)14.8Fe78.7B6.5sintered magnets as grain boundary modifiers. The corrosion resistance was found to be remarkably improved by small additions of Al85Cu15powders. When 1.2wt% Al85Cu15was added, the corrosion rate of magnets in humid environments was reduced by two orders of magnitude. This is partly due to the stability enhancement of the (Pr, Nd)-rich intergranular phase by Cu and Al. In addition, the occurrence of the Cu-rich phase ((Pr, Nd)22Fe56Cu10Al2O10), whose open-circuit potential is higher than the (Pr, Nd)-rich intergranular phase, may be another reason for the improvement of the corrosion resistance. Furthermore, the magnetic properties of (Pr, Nd)14.8Fe78.7B6.5were also improved by adding 0.3–1.2wt% Al85Cu15. Optimum addition amount was 0.6wt%. The improvement of the magnetic properties may be related to the microstructural modification and the increase of magnet density.