Composition Dependence of Magnetic Shielding Properties for Amorphous Ribbons (FeNi)78Mo4B17Si

1985 ◽  
Vol 58 ◽  
Author(s):  
Der-Ray Huang ◽  
Wen-Huu Dow ◽  
Pei-Chih Yao ◽  
Shu-En Hsu
Keyword(s):  
Magnetic Fields ◽  
Melt Spinning ◽  
Composition Dependence ◽  
Skin Effect ◽  
Magnetic Shielding ◽  
Shielding Effectiveness ◽  
Amorphous Ribbons ◽  
Shielding Properties ◽  
Applied Fields ◽  
Melt Spinning Technique

ABSTRACTAmorphous ribbons (FeNi)78Mo4B17Si, made by melt—spinning technique were prepared as magnetic shielding materials. Cylindrical shields (~0.05mm thick) were fabricated by wrapping ribbons on 20cm long pyrex tubes with 45mm diameter. DC and AC (60Hz, 400Hz, 800Hz, 1 kHz) magnetic shielding data were obtained by following the modified ASTM (A698–74) procedure. For DC magnetic fields, Ni—rich shields showed maximum shielding values at lower applied fields (0.1 0e~l 0e), while Fe—rich shields showed maximum shielding values at higher applied fields (1~5 0e). For AC magnetic fields, the magnetic fields, the magnetic shielding effectiveness was also influenced by skin effect at shield' surfaces. By comparing the data to calculations from shielding theory, there is about 8% magnetic shielding effectiveness induced by skin effect at 1 kHz.

scholarly journals Effects of High Magnetic Fields on Phase Transformations in Amorphous Nd2Fe14B

2019 ◽  
Vol 5 (1) ◽  
pp. 16 ◽  
Author(s):  
Michael Kesler ◽  
Brandt Jensen ◽  
Lin Zhou ◽  
Olena Palasyuk ◽  
Tae-Hoon Kim ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Melt Spinning ◽  
Magnetic Behavior ◽  
Phase Evolution ◽  
High Magnetic Fields ◽  
Phase Identification ◽  
Zero Field ◽  
Transmission Electron ◽  
Size And Morphology ◽  
Applied Fields

We briefly summarize the results from a set of experiments designed to demonstrate the effects of high magnetic fields applied during thermal annealing of amorphous Nd2Fe14B produced through melt-spinning. A custom-built differential scanning calorimeter was used to determine the crystallization temperatures in zero-field and in applied fields of 20 kOe and 90 kOe, which guided subsequent heat treatments to evaluate phase evolution. X-ray diffraction was used for phase identification and transmission electron microscopy was employed for observation of the crystallite size and morphology. Magnetization measurements were also used to evaluate the resulting magnetic phases after thermomagnetic processing. While the applied magnetic fields do not appear to affect the crystallization temperature, significant effects on the kinetics of phase evolution are observed and correlated strongly to the magnetic behavior.

Innovative Melt-Spinning Technique for Ferromagnetic Amorphous Ribbons

1985 ◽  
Vol 58 ◽  
Author(s):  
H. Y. Yu ◽  
D. R. Huang ◽  
P. C. Yao ◽  
S. E. Hsu
Keyword(s):  
Magnetic Properties ◽  
External Field ◽  
Magnetic Moment ◽  
Melt Spinning ◽  
Amorphous Ribbon ◽  
Initial Permeability ◽  
Field Direction ◽  
Amorphous Ribbons ◽  
Melt Spinning Technique

ABSTRACTA new melt-spinning technique (field quenching) for ferromagnetic amorphous ribbon is suggested to produce better magnetic properties than conventional as-quenched amorphous ribbon. An external field is applied during the quenching either parallel or perpendicular to the casting direction. The magnetic moment and initial permeability are increased when the field direction is parallel to the casting direction. These effects are opposite when these two directions mentioned are perpendicular to each other.

scholarly journals Magnetic characterization of Fe-Al-B amorphous ribbons obtained by the melt spinning technique

2011 ◽  
Vol 15 ◽  
pp. 03003 ◽  
Author(s):  
J.A. García ◽  
J. Carrizo ◽  
L. Elbaile ◽  
M. Rivas ◽  
R.D. Crespo ◽  
...  
Keyword(s):  
Melt Spinning ◽  
Magnetic Characterization ◽  
Amorphous Ribbons ◽  
Melt Spinning Technique

Rapidly Solidified Melt-spun Bi-Sn Ribbons: Surface Composition Issues

2016 ◽  
pp. 3287-3297
Author(s):  
Tarek El Ashram ◽  
Ana P. Carapeto ◽  
Ana M. Botelho do Rego
Keyword(s):  
Chemical Composition ◽  
Optical Microscopy ◽  
Melt Spinning ◽  
Surface Composition ◽  
Electrochemical Process ◽  
Melt Spun ◽  
Bismuth Alloy ◽  
The One ◽  
Rapidly Solidified ◽  
Melt Spinning Technique

Tin-bismuth alloy ribbons were produced using melt-spinning technique. The two main surfaces (in contact with the rotating wheel and exposed to the air) were characterized with Optical Microscopy and AFM, revealing that the surface exposed to the air is duller (due to a long-range heterogeneity) than the opposite surface. Also the XPS chemical composition revealed many differences between them both on the corrosion extension and on the total relative amounts of tin and bismuth. For instance, for the specific case of an alloy with a composition Bi-4 wt % Sn, the XPS atomic ratios Sn/Bi are 1.1 and 3.7 for the surface in contact with the rotating wheel and for the one exposed to air, respectively, showing, additionally, that a large segregation of tin at the surface exists (nominal ratio should be 0.073). This segregation was interpreted as the result of the electrochemical process yielding the corrosion products.

scholarly journals Electromagnetic Shielding Properties of Knitted Fabric Made from Polyamide Threads Coated with Silver

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1281
Author(s):  
Tanja Pušić ◽  
Bosiljka Šaravanja ◽  
Krešimir Malarić
Keyword(s):  
Composite Structures ◽  
Silver Coating ◽  
Cyclic Process ◽  
Knitted Fabric ◽  
Shielding Effectiveness ◽  
Dry Cleaning ◽  
Surface Mass ◽  
Degree Of Protection ◽  
Shielding Properties ◽  
The Stability

This paper investigates a textile material of low surface mass for its protection against electromagnetic radiation (EMR), which is suitable for composite structures of garments, and for technical and interior applications. The shielding effectiveness against EMR of fabric knitted from polyamide threads coated with silver, measured in the frequency range of 0.9 GHz to 2.4 GHz, indicated a high degree of protection. The key contribution of the paper is the evaluation of the stability of the shielding properties against EM radiation after applying apolar and polar solvents, in synergy with the cyclic process parameters of wet and dry cleaning. The results of the study confirmed the decline in the shielding effectiveness after successive cycles of material treatment with dry and wet cleaning. The effect of wet cleaning in relation to dry cleaning is more apparent, which is due to the damage of the silver coating on the polyamide threads in the knitted fabric.

Microstructural Studies of NiCoMnIn Magnetic Shape Memory Ribbons

2013 ◽  
Vol 738-739 ◽  
pp. 436-440 ◽  
Author(s):  
Krystian Prusik ◽  
Katarzyna Bałdys ◽  
Danuta Stróż ◽  
Tomasz Goryczka ◽  
Józef Lelątko
Keyword(s):  
Melt Spinning ◽  
Room Temperature ◽  
Parent Phase ◽  
Magnetic Shape Memory ◽  
Melt Spun ◽  
Columnar Grains ◽  
Ebsd Technique ◽  
Microstructural Studies ◽  
Melt Spinning Technique ◽  
Scanning Electron

In present paper two ribbons of the Ni44Co6Mn36In14 (at.%) were prepared under different melt-spinning technique conditions. Microstructure of the ribbons was studied by scanning electron microscopy (SEM). Depending on the liquid ejection overpressure two types of ribbons microstructures were observed. Ribbon T1 for which ejection overpressure was 1.5 bar showed typical melt-spun ribbon microstructure consisting of a top layer of small equi-axial grains and columnar grains below. For T2 ribbon (ejection overpressure 0.2 bar) only a small fraction of the columnar grains were observed. Structure analysis of the ribbons performed by XRD showed that at room temperature both ribbons have B2 parent phase superstructure. No gamma phase precipitates were observed. In order to determine the orientation of the grains the EBSD technique was applied.

Synthesis and Characterization of Mnbi Magnetic Alloy via Two Different Processing Routes

2021 ◽  
Vol 875 ◽  
pp. 76-80
Author(s):  
Hifsa Mazhar ◽  
Wilayat Hussain
Keyword(s):  
Heat Treatment ◽  
Melt Spinning ◽  
Treatment Time ◽  
Magnetic Energy ◽  
Microstructural Characterization ◽  
Temperature Phase ◽  
Magnetic Alloy ◽  
Positive Temperature ◽  
Melt Spinning Technique

Manganese bismuth alloy has gained importance due to its rare earth free elements, positive temperature coefficient and unique magnetic properties. Low temperature phase (LTP) MnBi was successfully prepared by arc melting with subsequent heat treatments and melt spinning technique followed by heat treatment for different durations. LTP MnBi formation was confirmed using XRD analysis and microstructural characterization of the samples was done using field emission scanning electron microscope. MnBi with greater LTP amount was formed by melt spinning route when compared with its counter arc melted one. Magnetic energy density of LTP MnBi formed by melt spinning technique with different heat treatment time was studied.

Sign in / Sign up

Export Citation Format

Share Document