纳米多孔Fe-Si-B-P的脱合金制备及其电化学性能

在0.05 mol/L H₂SO₄溶液中对773～833 K热处理后的Fe₇₆Si₉B₁₀P₅非晶合金进行脱合金处理，采用脱合金法制备出Fe-Si-B-P纳米多孔材料。利用X射线衍射仪、扫描电子显微镜、透射电子显微镜等手段以及电化学工作站表征其表面形貌、微观结构和组成，研究其电化学性能。结果表明，热处理后的Fe₇₆Si₉B₁₀P₅非晶合金晶化为α-Fe、Fe₂B和Fe₃P相，在脱合金过程中α-Fe晶粒优先溶解形成纳米多孔结构，随着热处理温度从773 K提高到833 K材料中纳米多孔的孔径从150 nm增大到260 nm。同时，较大的比表面积提供更多的催化活性位点使纳米多孔Fe-Si-B-P具有比Fe₇₆Si₉B₁₀P₅非晶合金更优异的氧化还...     

FeCoZrNbB合金的晶化过程及磁性能

采用单辊快淬法制备Fe_81-xCo_xZr₇Nb₂B₁₀(x = 2, 4, 6) 系非晶合金,并对该系非晶合金进行热处理。利用X射线衍射和振动样品磁强计研究FeCoZrNbB 合金系的晶化过程和磁性能。结果表明,Fe_81-xCo_xZr₇Nb₂B₁₀(x = 2, 4, 6) 系合金在快淬速率为30 m/s时完全形成非晶。Fe₇₉Co₂Zr₇Nb₂B₁₀合金的晶化过程为非晶→非晶+α-Fe→α-Fe + Fe₃Zr + Fe₂Nb_0.4Zr_0.6;Fe₇₇Co₄Zr₇Nb₂B₁₀与Fe₇₅Co₆Zr₇Nb₂B₁₀合金的晶化过程相同为非晶→非晶+α-Fe→ α-Fe + Fe₃Zr →α-Fe + Fe₃Zr + Fe₂Nb_0.4Zr_0.6。Co 含量的增加抑制了退火后α-Fe晶相的形核,并促使Fe 3Zr化合物更易析出。Fe_81-xCo_xZr₇Nb₂B₁₀(x = 2, 4, 6) 合金的比饱和磁化强度( M_s) 和矫顽力 ( H_c) 随退火温度的变化趋势相同。530℃ 之前退火,随退火温度的升高M s增加并不明显 ; 530℃之后退火,M_s迅速上升。530℃ 退火,H_c达到最小值;高于530℃ 退火,H_c随退火温度的升高而增加。      

基于磁相互作用探索P掺杂对Fe-Si-Nb-Cu-B合金带材组织结构和软磁性能的影响

类金属元素是改善Fe基非晶纳米晶合金非晶形成能力和软磁性能的重要添加剂。用单辊甩带法制备了Fe_73.5Si_13.5Nb₃Cu₁B_9-xP_x(x=0, 3%, 6%, 9%)(原子分数)合金带材,从各元素间磁相互作用出发探索了P替换B对合金组织结构和软磁性能的影响。实验结果表明,P添加可有效提高合金的初晶相晶化温度以及合金的非晶形成能力;但是二次晶化相的析出温度降低,弱化了其热稳定性。当P含量为3%(原子分数)时,合金有较宽的退火温度窗口,且可有效细化初晶相晶粒尺寸,并在525℃退火后表现出最佳软磁性能,此时合金晶粒尺寸为9 nm,矫顽力为0.21 A/m,同时有效磁导率高于x=0合金。但是由于P的添加,残余非晶相中Fe的磁矩降低,导致合金的饱和磁感应强度降低。     

可磁分离Fe3O4/g-C3N4复合材料的制备及其性能

为了利用Fe₃O₄的磁响应性及石墨相C₃N₄（g-C₃N₄）优良的光催化活性,首先采用高温热聚合法,以尿素为前驱体制备g-C₃N₄,然后采用水热法合成了可磁分离Fe₃O₄/g-C₃N₄复合材料。利用TEM、XRD、TGA、BET和振动样品磁强计（VSM）等多种测试手段表征分析Fe₃O₄/g-C₃N₄复合材料的形貌、晶型结构、比表面积、成分、饱和磁化强度等。通过模拟太阳光下Fe₃O₄/g-C₃N₄复合材料光催化吸附降解亚甲基蓝（MB）的实验,评价了Fe₃O₄/g-C₃N₄复合材料的吸附性能及光催化性能。结果表明,可磁分离Fe₃O₄/g-C₃N₄复合材料具有较大的比表面积,约为71.89 m²/g;且具有较好的磁性,饱和磁化强度为18.79 emu/g,可实现复合材料的分离回收;光照240 min时,Fe₃O₄/g-C₃N₄复合材料对MB的去除率为56.54%。所制备的Fe₃O₄/g-C₃N₄复合材料具有优良的吸附性能、光催化活性和磁性,并可通过外加磁场进行分离与回收。     

纳米Fe3O4及Fe3O4-SrFe12O19吸波复合材料的制备及性能

采用共沉淀法成功制备出具有超顺磁性的纳米Fe₃O₄, 并将Fe₃O₄与SrFe₁₂O₁₉复合制成复合吸波材料Fe₃O₄-SrFe₁₂O₁₉, 利用X射线衍射仪(XRD)、透射电镜(TEM)、振动样品磁强计(VSM)和矢量网络分析仪(PNA)对产物的物相、显微结构、磁性能和吸波性能进行了表征与分析。结果表明, 当Fe₃O₄与SrFe₁₂O₁₉质量比为1∶0.3时, Fe₃O₄-SrFe₁₂O₁₉饱和磁化强度为11.1 emu·g^-1, 矫顽力0.86 Oe, 剩余磁化强度0.08 emu·g^-1, 其吸波性能最佳, 最大吸收峰值为-17.7 dB,-5 dB频宽为1.3 GHz, 较Fe₃O₄和 SrFe₁₂O₁₉的最大吸收峰值分别提高247%和185%, 频带分别拓宽1.12 GHz和0.40 GHz。     

Fe78Si9B13非晶条带对水中Sb(Ⅲ)的去除性能研究

采用单辊甩带法制备Fe₇₈Si₉B₁₃非晶条带,以300目铁粉为参比物,对比研究了非晶条带对Sb(Ⅲ)的去除效果。结果显示,非晶条带在90 min内对Sb(Ⅲ)的去除率为90.6%,并且表面积约化反应速率系数高达铁粉的41倍。对反应产物进行观察分析,发现Si、B会在非晶条带表面富集,有益于表面产物层的脱落。此外,非晶条带通过吸附去除Sb(Ⅲ),将条带循环使用6次后,仍能保持62.3%的去除率。     

Fe73.5Cu1Nb3Si13.5B9软磁粉/硅橡胶力敏复合材料的逾渗特性

以三元嵌段共聚硅橡胶为基体,Fe_73.5Cu₁Nb₃Si_13.5B₉软磁粉为应力敏感填充粒子,采用机械共混和精密铸压热成型方法制备出系列粉体含量的Fe_73.5Cu₁Nb₃Si_13.5B₉软磁粉/硅橡胶接触应力敏感复合材料,重点研究了其交流阻抗、直流电阻、粒子间及粒子与硅橡胶间相互作用程度等性能的逾渗特性。研究表明,该柔性力敏复合材料具有较显著的交流阻抗双逾渗特性。分析发现,“第一逾渗区”内材料的交流阻抗值由粒子的隧道跃迁主导,“第二逾渗区”内材料的交流阻抗大小取决于Fe_73.5Cu₁Nb₃Si_13.5B₉粒子链间的接触电阻值。     

纳米Fe3O4/聚苯胺复合粒子的制备及其在交变磁场下的发热性能

用水解沉淀法合成了纳米Fe₃O₄粒子,并在其悬浮液中原位包覆聚苯胺,制备出纳米Fe₃O₄/聚苯胺复合粒子。研究了两种纳米粒子在交变磁场下的发热性能,对它们在定向集热治疗肿瘤中的应用前景进行了评价。纳米Fe₃O₄粒子的粒径为10~30nm,表面包覆聚苯胺后,复合粒子的粒径为30~50nm。纳米Fe₃O₄粒子的比饱和磁化强度为50.05Am2/kg,矫顽力为10.9kA/m;纳米Fe₃O₄/聚苯胺复合粒子的比饱和磁化强度为26.34Am2/kg,矫顽力为0。在10mg/mL的生理盐水悬浮液中,在外加交变磁场作用30min后,纳米Fe₃O₄粒子悬浮液的温度为63.6℃,纳米Fe₃O₄/聚苯胺悬浮液的温度为52.4℃,二者均达到了医学上定向集热治疗肿瘤用热籽的发热要求,是很有应用前景的医用纳米材料。      

硅橡胶压磁复合材料力学性能纳米压痕实验研究

通过纳米压痕测试技术对非晶Fe_73.5Cu₁Nb₃Si_13.5B₉/硅橡胶压磁复合材料薄膜的力学性能进行了研究, 讨论了加载速率、 保载时间、 峰值载荷等试验参数对模量和硬度测试结果的影响。进一步分析了纳米压痕实验表征非晶Fe_73.5Cu₁Nb₃Si_13.5B₉/硅橡胶压磁复合材料薄膜蠕变行为的可行性, 通过合理确定压痕蠕变实验参数, 获得该材料的蠕变应力指数。结果表明: 相对峰值载荷, 加载速率对测试结果影响更为显著, 而保载时间对硬度和模量测试结果几乎没有影响。     

自组装法制备磺化聚苯乙烯@Fe3O4磁性复合颗粒及其磁性能

实现结构可控、均匀包覆是制备核-壳复合材料的关键。采用离子交换法完成了磺化聚苯乙烯(PSS)表面Na+与溶液中Fe2+和Fe3+的交换,于碱性条件下制备了PSS表面负载Fe₃O₄(PSS@Fe₃O₄)的磁性复合颗粒。通过称重法计算了Fe₃O₄最大包覆率;通过振动样品磁强计(VSM)测试了不同负载含量下PSS@Fe₃O₄复合颗粒的磁性能;通过XRD、衰减全反射-FTIR (ATR-FTIR)、SEM-EDS分析了PSS@Fe₃O₄磁性复合颗粒的化学组成和微观结构。结果表明,随着Fe2+/Fe3+浓度增加,PSS@Fe₃O₄磁性颗粒的饱和磁化强度也随之增大,最大饱和磁化强度为7.51 emu/g,并具有明显的磁响应性;Fe₃O₄均匀包覆在PSS表面,最大包覆率为8.3 wt%。PSS@Fe₃O₄磁性复合颗粒有望用于磁流变、医学及水处理领域。      

Contribution of the crystalline phase Fe100-xSix to the temperature dependence of magnetic properties ofFINEMET-type alloys

The temperature dependence of the hysteresis loop, saturation magnetization, and saturation magnetostriction of rapidly quenched ribbons of the compositions Fe_100-xSi_x (x=12.1, 13.8, 20.0) and of FINEMET-type material with compositions Fe_73.6 Cu₁Nb₃Si_13.5B₉ Fe_73.5Cu₁Nb₃Si_16.5B₆ were measured between room temperature and 400°C. This paper analyzes the temperature dependence of the saturation magnetostriction and the saturation magnetization of the FINEMET ribbons after various heat treatments, assuming a superposition of the properties of the nanocrystalline Fe-Si and of the remaining amorphous phase. The behavior of the coercivity of Fe-Si prepared by rapid solidification follows roughly that of the (absolute value) of the magnetostriction. The Curie temperature of the remaining amorphous phase is enhanced     

Preparation and crystallization of Ti53Cu27Ni12Zr3Al7Si3B1 bulk metallic glass with wide supercooled liquid region

Ti-based bulk metallic glass (BMG) alloy with the composition of Ti₅₃Cu₂₇Ni₁₂Zr₃Al₇Si₃B₁ was prepared by copper molder casting method and ribbon sample was prepared by melt spinning to compare. The thermal instability of this glass phase was examined by using differential scanning calorimetry (DSC) and differential thermal analysis (DTA). The results revealed that the supercooled liquid region (ΔT_x), glass transition temperature (T_g) and reduced glass transition temperature (T_g/T_m) of the glassy alloy are detected to be 69, 685 and 0.62 K, respectively. The crystallization behavior of the Ti-based glass phase was also investigated by annealing the glass phase at series temperatures above T_g. The annealed microstructures were examined by means of X-ray diffraction experiments. The crystallization process of the BMG can be characterized by metastable crystalline phases at the first crystallization step and further transition to stable crystalline phases at high temperature through metastable crystalline phase.     

Magnetic anisotropies in single and multilayered thin films grownby bowed-substrate sputtering

Thin-film structures composed of nearly nonmagnetostrictive single-layer Co₇₆Fe₄B₂₀ or magnetostrictive Fe₈₀B₂₀ and Co₇₅Si₁₅B₁₀ amorphous layers have been deposited on bowed glass substrates using the RF-sputtering technique. The fabrication procedure induces a postdeposition compressive stress in the thin-film structure when the sample is retrieved from an arching device in the sputtering chamber. This results in an induced magneto-elastic anisotropy that governs the magnetic easy axis of the film, depending on the sign of the magnetostriction constant of each layer. Particular attention is paid here to heterogeneous structures made of bi- or multilayers with magnetic easy axis oriented in a different direction in each layer. Bulk magnetic properties were evaluated from hysteresis loops and thermomagnetization measured by vibrating sample magnetometry (VSM) and quantum interference device (SQUID) magnetometry. Magnetic domain walls and out-of-plane magnetized domains were observed by a Kerr imaging system and magnetic force microscopy. The combination of microstructure and strains induced in the layers determines the orientation of the observed magnetic anisotropies, which vary from high in-plane anisotropies up to out-of-plane orientations for selected films. The results, which provide reassurance that effective anisotropies are induced in each of the layers, are discussed in terms of the interactions between magnetic phases with different induced easy magnetization axes     

微晶玻璃焊料在连接过程中的晶化行为研究

采用一种添加Li₂O和Fe₂O₃的CaO-Al₂O₃-SiO₂基微晶玻璃连接氧化铝陶瓷。通过采用热分析(DTA)、扫描电镜(SEM)和X射线衍射分析(XRD)等方法, 研究了微晶玻璃焊料在连接过程中的晶化行为及其对接头力学性能的影响。结果表明, 在传统的晶化处理过程中, 此玻璃中能够析出锂辉石(LiAlSi₂O₆)、硅灰石(CaSiO₃)、钙铁镏石(Ca₃Fe₂Si₃O₁₂)和钙长石(CaAl₂Si₂O₈)四种晶体。然而, 当采用此玻璃连接氧化铝陶瓷时, 微晶玻璃的晶化过程与连接工艺密切相关。由于缺少足够的形核驱动力, 采用焊后直接冷却的连接工艺只能获得完全玻璃态的接头中间层。通过在降温过程中引入形核-晶化的热处理工艺, 促进了玻璃中间层的晶化, 并且能够通过改变晶化温度来调整中间层的相组成。另外, 晶化相的种类对接头力学性能有重要影响。当中间层中只形成钙长石时, 接头强度达到247.5 MPa; 而当中间层中有锂辉石或钙铁镏石析出时, 接头强度仅为10~135 MPa。     

Influence of thermal treatments on the elastic parameters in iron rich metallic glasses

The change of magnetoelastic properties after thermal treatments has been investigated for two groups of metallic glasses. (Fe₇₉Co₂₁)_75+xSi_15−1.4xB_10+0.4x (x (at.%)=0, 2, 4, 6, 8, 10) has been studied both in the as-prepared state and after thermal annealing in an applied magnetic field, to achieve a particular domain structure, at temperatures well below the crystallization temperatures. Changes in the ΔE effect, magnetomechanical coupling (k) and internal friction coefficient (Q⁻¹) are reported, reaching values of about 60% of the saturation value E_S. Fe₆₄Ni₁₀Nb₃Cu₁Si₁₃B₉ alloys annealed in vacuum for 1 h in the temperature range 350–550 °C showed maximum values of the ΔE effect and k of 61% and 0.85, respectively, accompanied by a minimum value of Q of around 2 for the sample annealed at 460 °C. These variations are related to the progress of nanocrystalization. The properties achieved are among the best reported for magnetomechanical applications.     

Fe2W型铁氧体BaFe2-x2+CoxFe163+O27(x=0.0~0.8)的微观结构和磁性

用固相法制备Fe₂W型铁氧体BaFe_2-x²⁺Co_xFe₁₆³⁺O₂₇(x=0.0~0.8),采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、红外光谱仪(FT-IR)和振动样品磁强计(PPMS-VSM)等手段分析其物相组成、结构和磁性并使用Reitveld拟合分析晶体结构,研究了Co²⁺部分取代Fe²⁺的Fe₂W型铁氧体的微观结构和磁性。结果表明：所有样品都是纯相铁氧体BaFe_2-x²⁺Co_xFe₁₆³⁺O₂₇。样品具有W铁氧体结构,晶粒呈良好的六角形结构且分布均匀。用 Co取代能明显提高Fe₂W型铁氧体300 K的饱和磁化强度(M_s)。     

Fe3O4/高岭土磁性复合材料对Cu2+的吸附性能

为实现高岭土（Kaolin）在Cu²⁺废水处理中的实际应用,采用球磨方法制备了剥离Kaolin,并通过氧化沉淀法制备了Fe₃O₄/Kaolin磁性复合材料。通过激光粒度分析仪、SEM、XRD对Fe₃O₄/Kaolin磁性复合材料的形貌及组成进行表征,并通过测试Fe₃O₄/Kaolin磁性复合材料对Cu²⁺的饱和吸附量和磁分离回收率,确定了当Kaolin球磨4.0 h、掺量为3.0 g时所制备的Fe₃O₄/Kaolin磁性复合材料对Cu²⁺的吸附性能最佳,平衡吸附量为17.98 mg/g。磁滞回线结果表明,Fe₃O₄/Kaolin磁性复合材料具有较好的磁响应性,饱和磁化强度约为16.19 emu/g。此外,采用Langmuir和Freundlich吸附等温式对Fe₃O₄/Kaolin磁性复合材料的吸附数据进行拟合,结果表明,Fe₃O₄/Kaolin磁性复合材料对Cu²⁺的吸附行为基本符合Langmuir吸附等温模型和Freundlich吸附等温模型,既存在单分子层吸附,也存在多分子层吸附。