摘要
烧结钕铁硼作为关键的稀土永磁材料,在航空航天、新能源汽车等众多领域具有广泛应用,然而其韧性欠佳这一缺陷对机械加工性能产生了不良影响。为改善材料的加工性能,本文针对成分为Re_(30.5)B_(0.9)Fe_(bal)M_(1.1)的钕铁硼磁体,研究了其粉末粒度对磁体力学性能以及磁性能的影响。实验结果表明,增大钕铁硼粉末粒度后,磁体的平均抗弯强度下降,但是断裂韧性得到提升。当钕铁硼粉末粒度从2.97μm增加至3.37μm时,磁体的平均晶粒尺寸从4.206μm增大至6.382μm;断裂韧性由2.94 MPa·m^(1/2)提升至3.59 MPa·m^(1/2),提高了22.1%;平均抗弯强度从367.39 MPa降低至310.83 MPa,降低了15.4%。粉末粒度对磁体剩磁的影响不明显,但磁体矫顽力随着粉末粒度的增大而减小。
Sintered NdFeB,as a key rare earth permanent magnetic material,has been widely used in many fields such as aerospace,new energy vehicles and so on.However,its toughness is not good,and this defect has an adverse effect on the machining performance.In order to improve the processing properties of the material,the influence of powder particle size on the mechanical properties and magnetic properties of Nd-FeB magnet with a composition of Re_(30.5)B_(0.9)Fe_(bal)M_(1.1)was studied in this paper.The experimental results show that after increasing the particle size of NdFeB powders,the average bending strength of the magnet decreases,but the fracture toughness is improved.When the particle size of NdFeB powders increases from 2.97μm to 3.37μm,the average grain size of the magnet increases from 4.206μm to 6.382μm.The fracture toughness of the magnet increases by 22.1%from 2.94 MPa·m^(1/2)to 3.59 MPa·m^(1/2).The average bending strength of the magnet decreases by 15.4%from 367.39 MPa to 310.83 MPa.The powder particle size has no obvious influence on the residual magnetism of the magnet,but the coercive force decreases as the powder particle size increases.
作者
陈云志
张中烨
舒建华
李林
王川
俞珺
CHEN Yun-zhi;ZHANG Zhong-ye;SHU Jian-hua;LI Lin;WANG Chuan;YU Jun(Hunan Rare Earth Metal Materials Research Institute Co.,Ltd.,Changsha 410126,China;Hunan Rare Earth New Energy Materials Co.,Ltd.,Changsha 410126,China)
出处
《稀有金属与硬质合金》
北大核心
2025年第6期108-113,共6页
Rare Metals and Cemented Carbides
关键词
烧结钕铁硼
粒度
断裂韧性
抗弯强度
磁性能
晶粒尺寸
sintered NdFeB
particle size
fracture toughness
bending strength
magnetic property
grain size
