烧结Nd-Fe-B磁体非稀土Al的晶界扩散研究  

Grain Boundary Diffusion of Non-Rare Earth Al for Sintered Nd-Fe-B

作　　者：闫小童 侯育花[1] 陈诚[1] 符小坤 葛现金 李伟[1] 黄有林[1] 罗军明[1] 庞再升 钟震晨[3] Yan Xiaotong;Hou Yuhua;Chen Cheng;Fu Xiaokun;Ge Xianjin;Li Wei;Huang Youlin;Luo Junming;Pang Zaisheng;Zhong Zhenchen(Nanchang Hangkong University,Nanchang 330063,China;Ganzhou Fortune Electronics Co.Ltd,Ganzhou 341000,China;Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]南昌航空大学,江西南昌330063 [2]赣州富尔特电子股份有限公司,江西赣州341000 [3]江西理工大学,江西赣州341000

出　　处：《稀有金属材料与工程》2020年第8期2760-2764,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51961027,51401103,51564037);江西省重点研发项目(20181ACE50005);江西省教育厅科技项目(GJJ170587)。

摘　　要：以Al粉作为扩散源,研究了不同晶界扩散工艺对Nd-Fe-B磁体微观结构和磁性能的影响。研究发现,570℃/1h扩散时,磁体的综合磁性能最佳,其矫顽力和磁能积分别为1131kA/m和249kJ/m^3,较原始磁体分别提升了16%和9.6%,且磁体的温度稳定性也得到改善。微结构和成分分析研究表明,晶界扩散后,Al主要分布于晶间富稀土相,且其形貌由大块状进展为薄层状,界面也变得更为平直光滑,增强了对反磁化畴形核的抑制,减小了退磁场。此外,晶间富稀土相中的Al有助于腐蚀电位的提升,而腐蚀电流密度的降低则归因于富稀土相分布的变化。Using Al powder as diffusion source,the influence of grain boundary diffusion processes on the microstructure and magnetic properties of Nd-Fe-B magnets was investigated.It is found that the optimum magnetic properties including the coercivity of 1131 kA/m and the maximum energy product of 249 kJ/m3 can be achieved,which are increased by 16%and 9.6%,respectively compared with those of the as-prepared magnet.Meanwhile,the temperature stability is also improved.Microstructural investigation reveals that after grain boundary diffusion,Al is mainly distributed in the intergranular RE-rich phase,and the morphology of RE-rich phase changes from large block to thin layer.Smoother and straighter interface can be obtained,which can restrain the nucleation of anti-magnetization domain,reducing the demagnetization field.In addition,the Al in the intergranular phase is beneficial in elevating the corrosion potential,and the decreased corrosion current density should be attributed to the changes of RE-rich phase distribution.

关 键 词：钕铁硼 晶界扩散 非稀土Al 

分 类 号：TM273[一般工业技术—材料科学与工程]