磁场退火对Fe80Si9B11非晶合金的磁致伸缩特性影响

摘要：利用激光多普勒法测量50Hz下非晶合金带材的磁致伸缩曲线,研究了磁场退火对Fe80Si9B11非晶合金带材的磁致伸缩特性的影响。结果显示,在相同的磁场强度下非晶带材经横磁退火后磁致伸缩最大,无磁场退火次之,纵磁退火时最小。然后,采用Kerr方法观察了非晶合金带材的磁畴形貌,从微观结构上解释了经不同磁场退火后磁致伸缩大小不同的机理。最后,对无磁场退火、横磁退火和纵磁退火后的Fe80Si9B11铁基非晶合金铁芯进行了噪音测试。结果显示,在相同的频率和磁通密度下,非晶合金铁芯经横磁退火后噪音最大,无磁场退火次之,纵磁退火时噪音最小,与非晶合金带材经不同磁场热处理后磁致伸缩大小的规律一致。为解决非晶合金铁芯在实际应用中的噪音问题提供了参考。     

热处理温度对铝钢复合板界面组织和性能的影响

摘要：利用激光多普勒法测量50Hz下非晶合金带材的磁致伸缩曲线,研究了磁场退火对Fe80Si9B11非晶合金带材的磁致伸缩特性的影响。结果显示,在相同的磁场强度下非晶带材经横磁退火后磁致伸缩最大,无磁场退火次之,纵磁退火时最小。然后,采用Kerr方法观察了非晶合金带材的磁畴形貌,从微观结构上解释了经不同磁场退火后磁致伸缩大小不同的机理。最后,对无磁场退火、横磁退火和纵磁退火后的Fe80Si9B11铁基非晶合金铁芯进行了噪音测试。结果显示,在相同的频率和磁通密度下,非晶合金铁芯经横磁退火后噪音最大,无磁场退火次之,纵磁退火时噪音最小,与非晶合金带材经不同磁场热处理后磁致伸缩大小的规律一致。为解决非晶合金铁芯在实际应用中的噪音问题提供了参考。     

Research progress on Finemet- type alloy with high saturation magnetic induction

Finemet type alloys attract a large number of scholars at home and abroad to study them due to their excellent soft magnetic properties such as high magnetic permeability, low loss and small magnetostriction coefficient. The structure and magnetic properties of Finemet type alloys were introduced and compared with other typical soft magnetic materials. The research work on improving the soft magnetic high saturation magnetic induction intensity of Finemet type alloy at home and abroad was reviewed, and the suggestions for future research directions were put forward.     

Dipping Paint Curing Amorphous U-Core Used as Reactor

 Non-oriented silicon steel (35W310) and amorphous ribbon (Fe78Si9B13 amorphous alloy) reactor U-cores are made by welding and dipping paint curing, respectively. Amorphous U-core used to make reactor cut sharply eddy current loss due to high electrical resistivity characteristic, thickness of thin ribbon and insulation of dipping paint. The amorphous alloy has high and constant magnetic permeability, and is more suitable for reactor design power to filter high order harmonic component. Keeping off high magnetostriction district with magnetic flux density of 50-100 mT can weaken influence on inductance of inductor due to elongation of magnetostriction. Amorphous alloy has a lower temperature rise using the software Infolytica 7. 2 simulation.     

铁基非晶纳米复合材料的结构及磁性能研究

对铁基非晶合金样品Fe65Ni1Al5Ga2P8.65B9.6Si3C5.75采用不同的预处理方式,利用XRD、TEM、SEM和VSM对样品的结构和磁学性能进行研究。结果表明,经过深冷+循环退火预处理之后,样品的原子结构发生弛豫,原子之间发生聚集,形成许多原子集团,原子之间的有序性和致密性增加。在部分晶化处理时,拥有较多原子集团的预处理非晶合金比淬态合金能够提供更多的形核核心,得到的晶粒尺寸更小,分布更加均匀,析出相的种类也更多,且非晶样品的晶化动力学和热力学过程也发生改变。预处理样品的软磁性能比淬态更优异。     

Effects of Magnetic Heat Treatment on Magnetostiction Properties of Tb0.3 Dy0.7 Fe1.95 Alloy

The effects of magnetic heat treatment on magnetostriction properties of Tb0.3Dy0.7Fe1.95 alloy were investigated.The directionally solidified alloy was heated to various temperatures near Curie temperature TC in vacuum, kept for a certain time under the application of magnetic field and then cooled to room temperature.The magnetostriction coefficient was measured by a resistance strain gage.The crystal structure was analyzed by X-ray diffraction (XRD).The experimental results show that the magnetostriction coefficient obviously increases and the grains orientations along the axis changed somewhat as the field of 1 T vertical to axis of the rod-shaped specimen is applied for 5 min at the heating temperature slightly lower than TC.     

铁钴纳米合金的制备及表征

Fe-Co合金是重要的金属软磁材料,由于具有高饱和磁感应强度、低矫顽力、高磁导率和低磁各向异性常数等独特的软磁材料性能而倍受关注。本实验以水合肼为还原剂,PVP为分散剂,采用液相还原法制备出纳米Fe-Co合金,并利用X射线衍射仪(XRD)、扫描电镜(SEM)、差示扫描量仪(DSC)对样品进行了表征。研究结果表明:制得的样品为非晶态无定形;颗粒呈球形,平均粒径为57nm;Fe-Co合金的抗氧化能力较强,在常温下不易被氧化。最后对Fe-Co纳米金属材料的发展趋势进行了展望,同时指出了Fe-Co纳米金属材料制备方法研究中存在的问题。     

Magnetic properties and fine structure of amorphous Fe–Ni–Si–B alloys

The magnetic properties and Mossbauer spectra of amorphous 2NSR alloy samples are investigated after quenching and after tempering for different times at 520°C. After quenching, the alloy is inhomogeneous. Tempering of alloy samples below the crystallization temperature (540°C) raises the Curie temperature and the mean superfine field at the iron nuclei. Tempering leads to complex changes in the saturation magnetization. The changes in magnetic properties are analyzed.     

高饱和磁化强度铁基非晶纳米晶软磁合金发展概况

概括了铁基非晶软磁合金和纳米晶合金的发展历史和现状,分别详述了高饱和磁化强度(B_s)铁基块体和薄带非晶以及纳米晶合金近年来的研究成果.主要内容包括:高饱和磁化强度块体铁基非晶软磁合金成分和性能,高饱和磁化强度铁基非晶薄带软磁合金的成分和性能,高饱和磁化强度铁基纳米晶合金的组织、结构和性能,各类元素对合金磁性能的影响.为进一步研究高饱和磁化强度的铁基软磁材料提供了有价值的参考.      

新型(Fe,Co)-Zr-RE-B非晶合金的热稳定性和磁性

利用旋铸技术制备了一种新型的含稀土元素的铁基非晶合金。研究了Nd含量对Fe70Co8Zr7-xNdxB15(x=0～6%原子数分数)合金的非晶形成能力、热稳定性和磁性能的影响。当该合金系的Nd含量在0～6%(原子数分数)变化时,其饱和磁感应强度(Js)在1.10T～1.37T范围内变化,矫顽力(Hc)在2.28A/m～8.15A/m范围内变化。Js随Nd含量的增加而增加,当Nd含量为2%和3%时,其Hc值均在3A/m以下,且在Nd含量为2%时,具有最高的非晶形成能力(glassformationability简称GFA)即大的ΔTx(达61K);同时又有良好的软磁性能,其Js和Hc值分别为1.25T和2.28A/m。经对比得出,Fe70Co8Zr5RE2B15(RE=Ce、Pr、Gd和Tb)合金与Fe70Co8Zr5Nd2B15具有相近的非晶形成能力和磁性能。     

Research status and future development trend of a novel FeSiBPCu nano soft magnetic alloy

The iron- based nano- soft magnetic alloy is applied to many magnetic components such as choke coils and transformers due to its excellent soft magnetic properties such as high saturation magnetic induction, low coercivity and low loss, which has attracted widely attention. Firstly, the research progress of traditional nano soft magnetic alloy and new FeSiBPCu nano soft magnetic alloy is elaborated??and the exploration of nano- soft magnetic alloys by some researchers at home and abroad was introduced. Then, compare the new FeSiBPCu nano- soft magnetic alloy with traditional nano- soft magnetic alloy, its advantages and disadvantages were listed. The progress and current status of some extended research on new FeSiBPCu nano- soft magnetic alloy to deal with these disadvantages was introduced. Finally, the future development of this new nano soft magnetic alloy was prospected.     

Magnetic Properties of FeSiBC Amorphous Alloy Powder Cores Using Mechanical-crushed Powder

The FeSiBC amorphous powder cores were fabricated using powders of the FeSiBC amorphous ribbons which were mechanically crushed for a short time, and the relationship between magnetic properties and powder particle sizes was evaluated. The saturation magnetization Bs of the amorphous Fe82Si2B15C1 alloy was 1.62 T, which provided a superior dc-bias property for the powder cores. Meanwhile, a stable permeability up to high frequency range over 10 MHz and the low core loss of 400 kW/ma at f=50 kHz and Bm =0.1 T were obtained. These excellent high-frequency magnetic properties of the FeSiBC amorphous powder cores could be attributed to the effective electrical insulation between the FeSiBC amorphous powders made by mechanical crushing.     

Low-temperature magnetic properties of amorphous metal alloys

The magnetic properties of amorphous metal alloys based on iron, silicon, and boron, with additions of other elements, are investigated at liquid-nitrogen temperatures. The magnetization and saturation magnetic field (magnetic hardness) of the alloy depend on the element added (carbon, phosphorus, or nickel). The maximum saturation magnetization is observed for the alloy with carbon, and the maximum saturation magnetic field for the alloy with phosphorus.     

逆变焊机用Fe_(73.5)Cu_1Mo_3Si_(15.5)B_7超微晶合金的软磁性能

对比了Fe73.5Cu1Mo3Si15.5B7超微晶合金和目前逆变焊机主变压器普遍采用的Fe73.5Cu1Nb3Si15.5B7铁芯的静态和动态磁性能。重点研究了两种材料铁芯的饱和磁致伸缩系数、10~40kHz范围内的高频性能和脉冲性能、-40~140℃间的损耗及磁导率变化。研究结果表明,Fe73.5Cu1Mo3Si15.5B7铁芯可获得低的高频损耗、高磁导率、较低的饱和磁致伸缩系数及良好的温度稳定性,满足逆变焊机主变压器对铁芯材料的要求,同时,Fe73.5Cu1Mo3Si15.5B7带材韧性更高,可改善材料制备的工艺性能和快淬带材的力学性能,提高成材率。     

Effect of copper on magnetostriction and mechanical properties of TbDyFe alloys

The intrinsic brittleness of the TbDyFe alloy significantly decreases its mach inability and applications.This paper aims to improve the toughness of TbDyFe alloy by adding Cu. Various alloys of the type(Tb_(0.3)Dy_(0.7))_(0.37)Fe_(0.63-χ)Cu_χ(χ=0, 0,01.0.03, 0.05, 0.08, 0.1) were fabricated by an arc melting furnace under a high purity argon atmosphere. The microstructure, magnetostrictive properties and mechanical performance were studied systematically. The results show that the (Tb,Dy)Cu phase forms in these alloys upon the addition of Cu. Correspondingly, their toughness improves, attributed to the formation of a (Tb,Dy)Cu phase. Compared to the Cu-free alloy, the fracture toughness (Kic) increases 2-3 times with increasing Cu content. However, the magnetostriction performance of these alloys declines with Cu addition, due to the low-magnetic performance of the (Tb,Dy)Cu phase at room temperature. Compared with other alloys, the alloy with the addition of 1at%Cu shows the best compromise between the saturation magnetostriction and fracture toughness.     

Effect of Addition of Al on Crystal Structure Microtexture and Magnetostriction Coefficient in Tb0.3 Dy0.7 Fe1.95 Alloy

The effect of addition of A1 on crystal structure microtexture and magnetostrictioncoefficient in Tb0.3Dy0.7Fe1.95 alloy were studied.The results show that addition of A1 does not change crystal structure of alloy and the precipitates increase in the microtexture as addition of A1 increases.At a certain magnetic field, magnetostriction coefficient decreased as addition of Al increased.     

成分对非晶态Fe—B—Si合金退火脆化行为的影响

本文研究了Ｂ和Ｓｉ的含量及Ｆｅ／（Ｂ＋Ｓｉ）相对含量对非晶态Ｆｅ－Ｂ－Ｓｉ合金退火脆化行为的影响；分析了在常规热处理条件下，利用成分的变化，获得延性与磁性综合性能的可能性。实验结果表明，非晶态Ｆｅ－Ｂ－Ｓｉ合金的退火脆化行为具有较大的成分依赖性，位于Ｆｅ７９ａｔ％－８１ａｔ％，Ｂ１１ａｔ％，Ｓｉ８ａｔ％－９ａｔ％成分范围内的Ｆｅ－Ｂ－Ｓｉ非晶态合金的退火脆化敏感性最小，脆化仍发生于晶化开始之前...     

液态金属雾化成形及非晶合金制粉的研究进展

面对绿色低碳发展与能源结构调整这一世界性挑战,通信网络和电子电气等领域对大电流功率电感器的要求不断提高.非晶合金软磁材料是当前迫切需要的先进电感器磁粉芯原料,其具备优异的高频导磁性、热稳定性和耐蚀性等优点而优于其他软磁材料.然而,作为一种原子短程有序而长程无序的亚稳态材料,非晶合金粉末的制备仍是一种难度较大的前沿技术....     

Magnetic Properties of Nanocrystalline Powder Cores Fabricated by Mechanically Crushed Powders

Fe73.5Cu1Nb3Si15.5B7 nanocrystalline powder cores with different particle sizes ranging from 10 to 125μm were fabricated by cold-pressing techniques.The cores exhibited increased core loss Pcvand decreased initial permeabilityμiwith addition of fine powders below 50μm in size,and the content should be less than 40mass%.It was thought to be closely related to the high coercive force Hcdue to the stresses generated during the crushing process and high demagnetization fields of small powders.Furthermore,modifying the alloy compositions by adding defined amount of Ni could improve the soft magnetic properties,including superior characteristics of permeability under high direct current(DC)bias field and comparable low core loss at high frequency.     

Enhanced magnetostrictive properties of lightly Pr-doped Fe_(83)Ga_(17) alloys

Fe_(83)Ga_(17)Pr_x alloys,where x=0,0.2,0.4,0.6 and 1.0,were prepared by a non-consumable vacuum arc melting technique under an inert argon gas atmosphere.The crystal structure and surface morphologies of the alloys were studied by X-ray diffraction(XRD) and scanning electron microscopy(SEM),respectively.Local compositional variations were measured by energy dispersive X-ray spectroscopy(EDXS).The magnetostriction coefficients of the alloys were measured by means of a differential resistive strain sensor.The magnetism of the sample was measured by a vibrating sample magnetometer(VSM).The results show that the parent Fe_(83)Ga_(17) alloy consists of a single A2 phase of bcc symmetry,whereas the Pr doped Fe_(83)Ga_(17) alloys are composed of the A2 phase of bcc structure and a small volume fraction of PrGa2 as a secondary phase.Most importantly,with increasing x,the magnetostriction coefficient of the Fe_(83)Ga_(17)Pr_x alloys first increases reaching a maximum saturation magnetostriction coefficient of192 ppm for x=0.6 at a magnetic field strength of 486 kA/m,then decreased.This maximum represents a 400% increase over the parent alloy with a mere 0.6 at% Pr doping.