scholarly journals Magnetic properties of Sm-Fe-N bulk magnets produced from Cu-plated Sm-Fe-N powder

AIP Advances ◽  
2016 ◽  
Vol 7 (5) ◽  
pp. 056204 ◽  
Author(s):  
Tetsuji Saito ◽  
Tomoe Deguchi ◽  
Hitoshi Yamamoto
Keyword(s):  
Magnetic Properties ◽  
N Powder

Structures and magnetic properties of Sm-Fe-N bulk magnets produced by the spark plasma sintering method

2007 ◽  
Vol 22 (11) ◽  
pp. 3130-3136 ◽  
Author(s):  
Tetsuji Saito
Keyword(s):  
Magnetic Properties ◽  
Spark Plasma Sintering ◽  
Bulk Material ◽  
Decomposition Temperature ◽  
High Coercivity ◽  
Bulk Materials ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Sintering Method ◽  
N Powder

Sm-Fe-N powders were successfully consolidated at 873 K and below by the spark plasma sintering (SPS) method. Although the decomposition temperature of the hard magnetic Sm2Fe17N3 phase has been reported to be 873 K, partial decomposition of the Sm2Fe17N3 phase was noted in the bulk materials obtained by sintering at below that temperature. The resultant bulk materials showed a coercivity of around 0.24 MAm−1, significantly lower than that of the original Sm-Fe-N powder. It was found that decomposition of the Sm2Fe17N3 phase in the SPS method was significantly lowered by the addition of a small amount of Zn powder to the Sm-Fe-N powder. The bulk material obtained by sintering a mixture of Sm-Fe-N and Zn powder (10%Zn) at 723 K exhibited high coercivity, comparable with that of the original Sm-Fe-N powder.

NEOQUENCH-P GRADE NP-8

Alloy Digest ◽  
2013 ◽  
Vol 62 (10) ◽  
Keyword(s):  
Magnetic Properties ◽  
Physical Properties ◽  
Rapid Quenching ◽  
Raw Material ◽  
Bend Strength ◽  
Powder Metal ◽  
Bonded Magnet ◽  
N Powder ◽  
Material Powder

Abstract NEOQUENCH-P GRADE NP-8 is one of a series of isotropic polymer bonded magnets based on Nd-Fe-B. The raw material powder is manufactured by rapid quenching of prescribed alloys into nanocrystalline flakes that are subsequently annealed for optimum magnetic properties. This alloy is an isotropic bonded magnet mixed with Sm-Fe-N powder and resin bond. This datasheet provides information on physical properties and bend strength. It also includes information on powder metal forms. Filing Code: Nd-5. Producer or source: Daido Steel (America) Inc..

Preparation of Porous Fe-Ni Soft Magnetic Powders by Fe-N Alloys Transformation

2012 ◽  
Vol 217-219 ◽  
pp. 1121-1125
Author(s):  
Guo Dong Cui ◽  
Yan Shuo Zhang ◽  
Chuan Yang ◽  
Hai Chun Jiang ◽  
Guo Qing Gao
Keyword(s):  
Magnetic Properties ◽  
Soft Magnetic Property ◽  
X Ray Diffraction ◽  
Soft Magnetic ◽  
X Ray ◽  
Gas Nitriding ◽  
Ni Powder ◽  
Vibration Sample Magnetometer ◽  
N Powder ◽  
Scanning Electron

The porous Fe-Ni powders were successfully prepared by the gas nitriding, electroless plating and then removal of denitrogen & phosphorus under high temperature. The phases of the powders were determined by X-ray diffraction (XRD) utilizing Cu Ka radiation. Scanning electron microscope (SEM) was used to characterize the morphology of the porous powders. The magnetic properties of the powders were measured by a vibration sample magnetometer (VSM). The result shows that the porous Fe-Ni-N powder was mainly composed of γ’-Fe4 N and FeNi3 while the porous Fe-Ni powders were comprised by Fe0.64Ni0.36 and Ni. The porous Fe-Ni powder has a good soft magnetic property with Saturation Magnetization of 113.5emu/g and coercivity of 162.9Oe.

scholarly journals Magnetic Properties of Sm-Fe-N/Co-B Composite Magnets Prepared by Chemical Reduction

2017 ◽  
Vol 2017 ◽  
pp. 1-4 ◽  
Author(s):  
Tetsuji Saito
Keyword(s):  
Aqueous Solution ◽  
Magnetic Properties ◽  
Hysteresis Loop ◽  
Composite Powder ◽  
Magnetic Phase ◽  
Chemical Reduction ◽  
N Powder

An attempt was made to produce Sm-Fe-N/Co-B composite magnets by chemical reduction. It was found that a composite powder consisting of Sm-Fe-N particles coated with fine Co-B particles could be obtained by chemical reduction. The Sm-Fe-N/Co-B composite powder acted as a single hard magnetic phase and showed a smooth hysteresis loop. The composite powder exhibited a higher remanence of 93.1 Am2/kg and a higher coercivity of 0.45 MA/m than a mixture of the Sm-Fe-N powder and Co-B powder prepared by a similar procedure but using a higher concentration of aqueous solution for the chemical reduction.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

Microstructure in soft magnetic E3 (S1, Al) (Sendust) alloys

1988 ◽  
Vol 46 ◽  
pp. 770-771
Author(s):  
June D. Kim
Keyword(s):  
Electron Microscopy ◽  
Magnetic Properties ◽  
Ternary Phase Diagram ◽  
Vertical Tube ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Soft Magnetic ◽  
Quenching Temperature ◽  
Thin Foils ◽  
Vertical Tube Furnace

Iron-base alloys containing 8-11 wt.% Si, 4-8 wt.% Al, known as “Sendust” alloys, show excellent soft magnetic properties. These magnetic properties are strongly dependent on heat treatment conditions, especially on the quenching temperature following annealing. But little has been known about the microstructure and the Fe-Si-Al ternary phase diagram has not been established. In the present investigation, transmission electron microscopy (TEM) has been used to study the microstructure in a Sendust alloy as a function of temperature.An Fe-9.34 wt.% Si-5.34 wt.% Al (approximately Fe3Si0.6Al0.4) alloy was prepared by vacuum induction melting, and homogenized at 1,200°C for 5 hrs. Specimens were heat-treated in a vertical tube furnace in air, and the temperature was controlled to an accuracy of ±2°C. Thin foils for TEM observation were prepared by jet polishing using a mixture of perchloric acid 15% and acetic acid 85% at 10V and ∼13°C. Electron microscopy was performed using a Philips EM 301 microscope.

Magnetic properties of new charge-transfer complexes based on manganese porphyrins

1997 ◽  
Vol 90 (3) ◽  
pp. 407-413
Author(s):  
MARC KELEMEN ◽  
CHRISTOPH WACHTER ◽  
HUBERT WINTER ◽  
ELMAR DORMANN ◽  
RUDOLF GOMPPER ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Charge Transfer ◽  
Charge Transfer Complexes ◽  
Manganese Porphyrins
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