Preparation and Characterization of Amorphous Soft Magnetic FeSiB Powders and Spark Plasma Sintered Compacts

2014 ◽  
Vol 216 ◽  
pp. 163-168
Author(s):  
Bogdan Viorel Neamţu ◽  
Traian Florin Marinca ◽  
Ionel Chicinaş ◽  
Florin Popa ◽  
Olivier Isnard
Keyword(s):  
Magnetic Properties ◽  
Amorphous Powder ◽  
Control Agent ◽  
Wet Milling ◽  
Soft Magnetic ◽  
Process Control Agent ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Ac Magnetization

Wet mechanical alloying (MA) were used to prepare amorphous soft magnetic Fe75Si20B5 (at.%) powders starting from elemental powders of Fe, Si and B. The structural, morphological and magnetic properties of the powders were investigated. It was found that wet MA leads to the amorphisation of the alloy after 40 hours of wet milling using benzene (C6H6) as process control agent (PCA). The influence of the wet MA process on the saturation magnetization of the powders was investigated. Amorphous powder of Fe75Si20B5 (at.%) obtained by wet MA route was used to prepare compacts by spark plasma sintering (SPS). The chosen sintering temperature was 800, 850 and 900 oC. Toroidal samples of Fe75Si20B5 (at.%) were investigated in DC and AC magnetization regime and their magnetic properties were correlated with sintering parameters, compacts density and phases evolution during sintering.

Fabrication of large-size Fe-based glassy cores with good soft magnetic properties by spark plasma sintering

2003 ◽  
Vol 18 (9) ◽  
pp. 2115-2121 ◽  
Author(s):  
Baolong Shen ◽  
Akihisa Inoue
Keyword(s):  
Magnetic Properties ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Liquid Region ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Large Size ◽  
High Relative Density ◽  
Plasma Sintering ◽  
Spark Plasma

Glassy Fe65Co10Ga5P12C4B4 alloy powders with a large supercooled liquid region of 50 K before crystallization were synthesized in the particle size range below 125 μm by Ar gas atomization. With the aim of developing a large-size Fe-based glassy core with good soft magnetic properties, the consolidation method of spark plasma sintering was applied to the Fe65Co10Ga5P12C4B4 glassy powders. The existence of the supercooled liquid region enabled us to form a large-size glassy alloy disc 20 mm in diameter and 5 mm in thickness with a high relative density of 99.7% at the glass-transition temperature of 723 K and under the external applied pressure of 300 MPa. The resulting glassy core of 18 mm in outer diameter, 10 mm in inner diameter, and 4 mm in thickness exhibits good soft magnetic properties: 1.20 T for saturation magnetization, 6 A/m for coercive force, and 8900 for maximum permeability. The good soft magnetic properties of the Fe-based bulk glassy core are attributed to the combination of the high relative density and the maintenance of the single glassy structure.

Microstructure and magnetic properties of Fe–6.5 wt.% Si/MnZn(Fe2O4)2 composites with core-shell structure prepared by spark plasma sintering

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744013 ◽  
Author(s):  
Liang Yan ◽  
Biao Yan
Keyword(s):  
Magnetic Properties ◽  
Shell Structure ◽  
Core Shell ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Plasma Sintering ◽  
Soft Magnetic Composites ◽  
Spark Plasma ◽  
Core Shell Structure ◽  
Microstructure And Magnetic Properties

Fe–6.5 wt.% Si powder coated with 10 wt.% MnZn(Fe2O4)2 (MnZn ferrite) was successfully prepared by using dry-type stirring ball milling. The Fe–6.5 wt.% Si/MnZn(Fe2O4)2 soft magnetic composites were prepared by subsequent spark plasma sintering. This paper aims at analyzing the microstructure and magnetic properties of Fe–6.5 wt.% Si/MnZn(Fe2O4)2 soft magnetic composites (sintering temperature: 750[Formula: see text]C, sintering pressure: 50 MPa, holding time: 8 min, heating rate: 60 K/min). Based on X-ray diffraction and scanning electron microscopy, microstructure and powder morphology were examined and magnetic measurements on bulk samples were conducted by vibrating sample magnetometer and impedance analyzer. According to the experiments results, Fe–6.5 wt.% Si/MnZn(Fe2O4)2 composites displayed a core-shell structure, and ceramic phase was observed after sintering. The Fe–6.5 wt.% Si/MnZn(Fe2O4)2 composites achieved high resistivity ([Formula: see text] m[Formula: see text]/cm) while maintaining excellent magnetic properties ([Formula: see text] emu/g). Core losses especially at medium and high frequencies were significantly reduced.

Properties of Ni0.5Zn0.5Fe2O4/Fe76Si9B10P5 Bulk Soft Magnetic Composites by Annealing Treatment

2017 ◽  
Vol 898 ◽  
pp. 684-688
Author(s):  
Ji Hang Ren ◽  
Zhan Kui Zhao
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Annealing Treatment ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Beneficial Effects ◽  
Plasma Sintering ◽  
Soft Magnetic Composites ◽  
Different Temperatures ◽  
Spark Plasma

Iron-based amorphous alloys have attracted technological and scientific interests due to their excellent soft magnetic properties. In the present study, Ni0.5Zn0.5Fe2O4/Fe76Si9B10P5 soft magnetic composites cylinder of 15 mm diameter and 3 mm thickness was prepared by spark plasma sintering at the temperature of 780 K. The amorphous Fe-based soft magnetic composites Ni0.5Zn0.5Fe2O4/Fe76Si9B10P5 exhibited good magnetic properties after annealing treatment at temperature ranging from 643 K to 743 K. The beneficial effects of treatment under different temperatures were discussed in terms of the improved magnetic performance of Ni0.5Zn0.5Fe2O4/Fe76Si9B10P5 soft magnetic composites.

Fabrication and soft-magnetic properties of Fe–B–Nb–Y glassy powder compacts by spark plasma sintering technique

2009 ◽  
Vol 17 (4) ◽  
pp. 218-221 ◽  
Author(s):  
Sangmin Lee ◽  
Hidemi Kato ◽  
Takeshi Kubota ◽  
Akihiro Makino ◽  
Akihisa Inoue
Keyword(s):  
Magnetic Properties ◽  
Spark Plasma Sintering ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Powder Compacts

Structures and magnetic properties of Nd–Fe–B bulk nanocomposite magnets produced by the spark plasma sintering method

2004 ◽  
Vol 19 (9) ◽  
pp. 2730-2737 ◽  
Author(s):  
Tetsuji Saito ◽  
Tomonari Takeuchi ◽  
Hiroyuki Kageyama
Keyword(s):  
Magnetic Properties ◽  
Spark Plasma Sintering ◽  
Applied Pressure ◽  
High Coercivity ◽  
Bulk Materials ◽  
Soft Magnetic ◽  
Nanocomposite Magnets ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Sintering Method

We studied the effects of the sintering temperature and applied pressure on Nd–Fe–B bulk nanocomposite magnets produced by the spark plasma sintering (SPS) method. Amorphous Nd4Fe77.5B18.5 melt-spun ribbons were successfully consolidated into bulk form by the SPS method. When sintered at 873 K under applied pressures between 30 and 70 MPa, the bulk materials consisted of nanocomposite materials with a soft magnetic Fe3B phase and hard magnetic Nd2Fe14B phase. The density and magnetic properties of the bulk materials sintered at 873 K were strongly dependent on the applied pressure during sintering. Bulk Nd4Fe77.5B18.5 nanocomposite magnets sintered at 873 K under an applied pressure of 70 MPa showed a high remanence of 9.3 kG with a high coercivity of 2.5 kOe.

scholarly journals Fe-Si/MnZn(Fe2O4)2 Core-shell Composites with Excellent Magnetic Properties by Mechanical Milling and Spark Plasma Sintering (SPS)

Metals ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 553 ◽  
Author(s):  
Liang Yan ◽  
Biao Yan
Keyword(s):  
Magnetic Properties ◽  
Spark Plasma Sintering ◽  
Mechanical Milling ◽  
Core Shell ◽  
Magnetic Composite ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Plasma Sintering ◽  
Soft Magnetic Composites ◽  
Spark Plasma

The Fe-Si/MnZn(Fe2O4)2 composite powders are synthetized by means of the mechanical milling, and Fe-Si/MnZn(Fe2O4)2 soft magnetic composites are prepared by spark plasma sintering (SPS). The impact of milling time on particle size, phase structure and magnetic properties of the investigative core-shell structure powders along with that of sintering temperature on microstructure and magnetic properties of FeSi-MnZn(Fe2O4)2 soft magnetic composite are studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). The experimental results demonstrate a layer of MnZn(Fe2O4)2 forming a coating on the surface of Fe-Si powder after mechanical milling, and the soft magnetic composites exhibiting excellent magnetic performance at 900 °C: 212.49 emu/g for saturation magnetization, with 6.89 Oe for coercivity, 3 × 10−4 Ω.m for electrical resistivity and stable amplitude permeability and low core loss over a wide frequency range. Therefore, SPS offers a convenient and swift way to enhance performance of soft magnetic composites using magnetic materials as insulting layer.

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