晶界添加PrCu合金对(Pr,Nd,Dy)_(32.2)Co_(13)Cu_(0.4)Fe_(bal)B_(0.98)M_(1.05)磁体磁性能与微观组织的影响  

Effect of Pr_(80)Cu_(20) grain boundary addition on microstructure and magnetic properties of (Pr,Nd,Dy)_(32.2)Co_(13)Cu_(0.4)Fe_(bal)B_(0.98)M_(1.05) magnet

作　　者：张家滕 徐吉元 金佳莹 孟睿阳 董生智[1] Zhang Jia-Teng;Xu Ji-Yuan;Jin Jia-Ying;Meng Rui-Yang;Dong Sheng-Zhi(Division of Functional Materials,Central Iron&Steel Research Institute,Beijing 100081,China;School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]钢铁研究总院,功能材料研究院,北京100081 [2]浙江大学材料科学与工程学院,杭州310027

出　　处：《物理学报》2022年第16期351-359,共9页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2021YFB3502900)资助的课题。

摘　　要：通过在(Pr,Nd,Dy)_(32.2)Co_(13)Cu_(0.4)Fe_(bal)B_(0.98)M_(1.05)(M=Al,Ga,Zr)磁体中添加低熔点合金Pr_(80)Cu_(20),提高磁体中的Cu含量,从而调控Co在富稀土相中的分布.相较于原磁体,掺Pr Cu磁体的剩磁保持不变,矫顽力提升约1.3 k Oe,居里温度、剩磁温度系数和不可逆磁损均有所改善.通过微观组织观察发现,原磁体二级回火态晶界处同时存在贫Co相与富Co相,但掺Pr Cu磁体二级回火态中,Cu和Co在晶界相中的分布均匀性明显改善,从而有效地消除了富Co相.由于软磁性相R_(2)(Fe,Co)17(R=Pr,Nd,Dy)容易与富Co相共生,有害于永磁性能,富Co相的消除可能是掺Pr Cu磁体二级回火态矫顽力提升的重要原因.With the aim of increasing Cu concentration to regulate the distribution of Co elements in RE-rich phase,the low-melting-point Pr_(80)Cu_(20) intergranular alloy is introduced into the(Pr,Nd,Dy)_(32.2)Co_(13)Cu_(0.4)Fe_(bal)B_(0.98)M_(1.05)(M=Al,Ga,Zr) magnet.Comparing with the original magnet,the remanence of PrCu-doped magnet is basically unchanged,and the coercivity is increased by approximately 1.3 kOe.Simultaneously,the Curie temperature,remanence temperature coefficient and irreversible flux loss are slightly improved.Microstructural study reveals that the Co-lean phase and the Co-rich phase coexist in the grain boundary in the2^(nd)-annealed original magnet.However,for the PrCu-doped magnet,the uniform distribution of Cu and Co elements in the intergranular phase are evidently improved,resulting in the elimination of the Co-rich phase.Since the R_(2)(Fe,Co)_(17)(R=Pr,Nd,Dy) soft magnetic phase easily coexist with the Co-rich phase and are detrimental to the coercivity,the elimination of Co-rich intergranular phase may be an important reason for the higher coercivity of the 2^(nd)-annealed PrCu-doped magnet than that of the original magnet.

关 键 词：烧结NDFEB磁体 晶界添加 回火 Cu和Co对立分布 矫顽力 

分 类 号：TM273[一般工业技术—材料科学与工程]