Magnetic properties and particle structure of SmCo5 alloy powder produced by a new electroerosion method

Nanocrystalline Fe-Co alloy powders, which were prepared by high-energy mechanical milling, were nitrided under the mixing gas of NH3/H2 in the temperature range from 380°C to 510°C. X-ray diffraction (XRD) was used to analyze the grain size and reaction during the processing. The magnetic properties of the nitrided powders were measured by Vibrating Sample Magnetometer (VSM). The results show that with the appearance of Fe4N phase after nitride treatment, and the grain-size of FeCo phase decreases with the increase of nitridation temperature between 380°C to 450°C.The saturation magnetization of nitrided alloy powder treated at 480°C is about 18% higher than that of the initial Fe-Co alloy powder, accompanied by the reduction of the coercivity. Transmission electron microscope (TEM) was used, attempting to further analyze the effect of Fe4N phase on microstructure and magnetic properties of the powder mixtures.

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The Effects of Insulating Materials on the Magnetic Properties of Nanocrystalline FeCuNbSiB Alloy Powder Cores

Journal of the Korean Magnetics Society ◽

10.4283/jkms.2004.14.5.186 ◽

2004 ◽

Vol 14 (5) ◽

pp. 186-191 ◽

Cited By ~ 6

Keyword(s):

Magnetic Properties ◽

Alloy Powder ◽

Insulating Materials

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The Effect of Mn Addition on Nitrogenation Behavior and Magnetic Properties of Sm-Fe Alloy Powder Produced by Reduction-diffusion Method

Journal of Korean Powder Metallurgy Institute ◽

10.4150/kpmi.2013.20.1.013 ◽

2013 ◽

Vol 20 (1) ◽

pp. 13-18

Author(s):

Young-Taek Seo ◽

Youn-Kyoung Baek ◽

Jung-Goo Lee ◽

Chul-Jin Choi

Keyword(s):

Magnetic Properties ◽

Alloy Powder ◽

Diffusion Method

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MICROSTRUCTURE AND MAGNETIC PROPERTIES OF NANOSTRUCTURED Al2O3-20vol%Fe70Co30 COMPOSITE PREPARED BY HIGH ENERGY MECHANICAL MILLING

International Journal of Modern Physics B ◽

10.1142/s0217979209061937 ◽

2009 ◽

Vol 23 (06n07) ◽

pp. 1383-1388 ◽

Cited By ~ 2

Author(s):

MASLEEYATI YUSOP ◽

DELIANG ZHANG ◽

MARCUS WILSON ◽

NICK STRICKLAND

Keyword(s):

Grain Size ◽

Magnetic Properties ◽

Alloy Powder ◽

Milling Time ◽

High Energy ◽

Composite Powders ◽

Nanostructured Composite ◽

Alloy Particles ◽

Average Grain Size ◽

Microstructure And Magnetic Properties

Al 2 O 3-20 vol % Fe 70 Co 30 composite powders have been prepared by high energy ball milling a mixture of Al 2 O 3 powder and Fe 70 Co 30 alloy powder. The Fe 70 Co 30 alloy powder was also prepared by mechanical alloying of Fe and Co powders using the same process. The effects of milling duration from 8 to 48 hours on microstructure and magnetic properties of the nanostructured composite powders have been studied by means of X-ray Diffractometry (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometry (VSM). It was found that the nanostructured composite powder particles with irregular shapes and Fe 70 Co 30 alloy particles being embedded in them formed after 8 hours of milling. The average grain size of the Al 2 O 3 matrix reduced drastically to less than 18nm after 16 hours of milling. On the other hand, the embedded alloy particles demonstrated almost unchanged average grain size in the range of 14-15nm. Magnetic properties of the powder compacts at room temperature were measured from hysteresis curves, and show strong dependence of the milling time, with the coercivity increasing from 67.1 up to 127.9kOe with increasing the milling time from 8 to 48 hours. The possible microstructural reasons for this dependence are discussed.

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