Magnetic properties and corrosion resistance of Nd-Fe-B magnets with Nd64Co36 intergranular addition
Magnetic properties and corrosion resistance of Nd-Fe-B magnets with Nd64Co36 intergranular addition
复制标题
Nd64Co36晶间添加Nd-Fe-B磁体的磁性能和耐腐蚀性能
DOI：
10.1016/j.jallcom.2014.07.085
复制
发表时间：
2014-12-15
影响因子：
6.2
通讯作者：
Yan, Mi
中科院分区：
文献类型：
--
作者：
Zhang, Pei;Liang, Liping;Yan, Mi
虽然低稀土含量（REC）的Nd-Fe-B烧结磁体具有较好的耐腐蚀性，但近化学计量比的Nd 2Fe 14 B磁体很难实现完全致密化和高磁性能。为了同时提高磁性能和耐蚀性，将Nd 64 Co 36共晶合金粉末添加到（Pr，Nd）（29.00）Fe69.75Ga0.20B1.05（wt.%）中，烧结磁铁含0.5重量%此外，由于与（Pr，Nd）（2）Fe 14 B基体相具有良好的润湿性，形成了连续的薄晶界层。在不降低剩磁B-r的情况下，矫顽力H-cj从9.94 kOe提高到13.01 kOe，最大磁能积BH（max）从40.02 MGOe明显提高到47.93 MGOe。与48 MGOe商用磁体相比，这种性能是上级的，但REC为1.24重量%。更低，这导致改进的耐腐蚀性和降低的成本。进一步的研究表明，晶间相的稳定性增强的结果，形成更稳定的含钴相和氧化物的晶间区域内和被他们阻塞的腐蚀通道。(C)2014爱思唯尔有限公司版权所有。
Although lower rare-earth content (REC) Nd-Fe-B sintered magnets possess better corrosion resistance, it is hardly to achieve full densification and high magnetic performance for near-stoichiometric Nd2Fe14B magnets. To improve magnetic performance and corrosion resistance simultaneously, Nd64Co36 eutectic alloy powders are added into (Pr, Nd)(29.00)Fe69.75Ga0.20B1.05 (wt.%) sintered magnets. With 0.5 wt.% addition, continuous thin grain boundary layers are formed for their better wettability with the (Pr, Nd)(2)Fe14B matrix phase. The coercivity H-cj is hence enhanced from 9.94 to 13.01 kOe without deteriorating remanence B-r, resulting in an obvious increase of maximum magnetic energy product (BH)(max) from 40.02 to 47.93 MGOe accordingly. In comparison with the 48 MGOe commercial magnets, such performance is superior, but the REC is 1.24 wt.% lower, which leads to an improved corrosion resistance and reduced cost. Further investigations reveal that the stability enhancement of the intergranular phase results from the formation of more stable Co-containing phases and oxides within the intergranular regions and the blocked corrosion channels by them. (C) 2014 Elsevier B.V. All rights reserved.