粉末粘结Tb-Dy-Fe合金的磁致伸缩性能及动态磁导率  

Magnetostriction and dynamic permeability of bonded Tb-Dy-Fe alloy powder

作　　者：牟星 程超 祁焱[1] 徐立红[1] 赵贵恒 张洪平[1] MU Xing;CHENG Chao;QI Yan;XU Li-hong;ZHAO Gui-heng;ZHANG Hong-ping(Department of Functional Material,Central Iron and Steel Rescarch Institute,Beijing 100081,China;Ningbo Ronbay New Energy Technology Co.,Ltd,Yuyao 315400,China)

机构地区：[1]钢铁研究总院功能材料研究所,北京100081 [2]宁波容百新能源科技股份有限公司,浙江余姚315400

出　　处：《粉末冶金工业》2020年第4期46-50,共5页Powder Metallurgy Industry

摘　　要：采用酚醛树脂粘结Tb0.27Dy0.73Fe1.95合金颗粒,在磁场取向作用下压制成形制备复合材料,研究粉末粒度、成形压力对其密度、磁致伸缩性能和动态磁导率的影响。结果表明,400 MPa成形压力下,250~420μm粉末制备的样品密度可达6.6 g/cm^3,在400 k A/m磁场下的磁致伸缩系数为731×10^-6,比粉末粒度为38~58μm的样品高110×10^-6。样品在5~50 kHz的交流磁场中磁导率变化幅度低于2%,具有很好的频率稳定性;交流磁场叠加偏置磁场的条件下,样品在1 k Hz交流磁场下无偏置磁场的磁导率为4.4,偏置磁场为1 528.3 A/m时增加到10.2,增加幅度大于131%。Phenolic resin was used to bond Tb0.27 Dy0.73 Fe1.95 alloy particles,and then the phenolic resin bonding composites were obtained by pressing and forming under the action of magnetic field orientation. The effects of powder particle size and forming pressure on its density,magnetostrictive properties and dynamic magnetic permeability had been analyzed. Samples prepared under 400 MPa forming pressure and with a powder size of 250-420 μm can reach a density of 6.6 g/cm^3. The magnetostrictive coefficient under 400 kA/m magnetic field is 731×10^-6,which is 110×10^-6 higher than samples with a powder size of 38-58 μm. The permeability of the sample varies less than 2% in an ac magnetic field from 5 to 50 kHz,showing good frequency stability. Under the condition of alternating field superposition bias magnetic field,the permeability of the sample in the unbiased magnetic field at 1 kHz is 4.4,while at 1 528.3 A/m increases to 10.2,with an increase of over 131%.

关 键 词：Tb-Dy-Fe合金 复合材料 磁致伸缩 动态磁导率 

分 类 号：TB333[一般工业技术—材料科学与工程]