快淬速度对Nd_(26)Pr_(3)FebalCo_(4)Ga_(0.42)B_(0.92)Nbx快淬薄带磁性和微观结构影响  

Effect of melt-spinning speed on magnetic properties and microstructure of Nd_(26)Pr_(3)FebalCo_(4)Ga_(0.42)B_(0.92)Nbx melt-spun ribbons

作　　者：苑子凯 王俊明[1] 钟雨江 刘瑞金 柳帅 郭朝晖[1] YUAN Zikai;WANG Junming;ZHONG Yujiang;LIU Ruijin;LIU Shuai;GUO Zhaohui(Division of Functional Materials,Central Iron&Steel Research Institute,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司功能材料研究所,北京100081

出　　处：《粉末冶金工业》2023年第5期36-42,共7页Powder Metallurgy Industry

基　　金：国家自然科学基金资助项目(51771055);宁波市科技创新2025重大专项资助项目(2019B10093)。

摘　　要：使用熔体快淬法制备了Nd26Pr3FebalCo4Ga0.42B0.92Nbx(x=0,0.5)系列快淬带,研究了快淬速度和微量掺杂高熔点元素Nb对快淬带磁性和微观结构的影响。提高快淬速度和掺杂Nb可大幅细化晶粒,使得快淬带非晶含量提升,导致快淬带磁性迅速下降,非晶成分的升高会导致晶化温度升高并提高快淬带的最佳热处理温度;经过最佳热处理后,快淬带性能得到提升,其中快淬速度为30 m/s的快淬带和掺杂0.5%Nb的快淬带晶粒长大程度低,各相之间耦合效应良好,获得了较好的磁性能,SEM和XRD结果表明二者获得了均匀的微观组织。快淬速度30 m/s的快淬带获得了最佳的磁性能,Br=0.91 T,μ_(0)H_(cj)=1.82 T,(BH)_(max)=141.65 kJ/m^(3);掺杂0.5%Nb的快淬带在略微牺牲剩磁下取得了最高的矫顽力,B_(r)=0.88 T,μ_(0)H_(cj)=2.19 T,(BH)_(max)=140.10 kJ/m3。The effects of melt-spinning speed and micro-doping of Nb,a high-melting-point element,on the magnetic properties and microstructure of Nd_(26)Pr_(3)FebalCo_(4)Ga_(0.42)B_(0.92)Nbx(x=0,0.5)melt-spun ribbons were investigated.Increasing the melt-spinning speed and doping Nb can significantly refine the grains,which increases the amorphous content of the melt-spun ribbons,resulting in a rapid decrease in the magnetic properties of the ribbons.The increase in the amorphous content leads to an increase in the crystallization temperature and optimum heat-treatment temperature of the ribbons.After the optimum heat treatment,the properties of the ribbons are improved,among which the ribbons with a melt-spinning speed of 30 m/s and the doped with 0.5%Nb obtains a good magnetic performance due to a low degree of grain growth and a high coupling effect between phases.A uniform microstructure is observed by SEM and XRD.The best magnetic properties are obtained at melt-spinning speed is 30 m/s,B_(r)=0.91 T,μ_(0)H_(cj)=1.82 T,(BH)_(max)=141.65 kJ/m^(3).The ribbons doped 0.5%Nb have the highest coercivity at the slight reduction of remanence,B_(r)=0.88 T,μ_(0)H_(cj)=2.19 T,(BH)_(max)=140.10 kJ/m3.

关 键 词：NDFEB磁体 熔体快淬法 晶化热处理 磁性 微观结构 

分 类 号：TB383.1[一般工业技术—材料科学与工程]