The Effect of Cu, P, Ga and Gd on Microstructure and Magnetic Properties in the PrFeCoBNb HD Sintered Magnets

An evaluation of the effect of alloying elements on the microstructure and magnetic properties of Pr15FebalCo8B7Nb0.05Mx (M = Cu, P, Gd and Ga; 0 ≤ x ≤ 0.25) sintered magnets has been carried out. A mixture of alloys and the high-energy milling technique have been used to prepare the magnets. The alloying elements have influenced the remanence, intrinsic coercivity and particularly the squareness factor (SF). Phosphorus addition improved (BH)max (254 kJm-3 ) and SF around 10% (0.89). The same improvement addition on intrinsic coercivity was observed with Gallium (1100mT) compared to the standard composition Pr15FebalCo8B7Nb0.05 (1000mT) magnet. Comparisons between the squareness factors obtained using the J×μ0H curve profile (SF), the estimated (sf) using microstructural parameters and Sf using a (BH)max and Br correlation have also been carried out.

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Microstructure and magnetic properties of core-shell Nd-La-Fe-B sintered magnets

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2018.03.291 ◽

2018 ◽

Vol 749 ◽

pp. 580-585 ◽

Cited By ~ 20

Author(s):

Jiaying Jin ◽

Zheng Wang ◽

Guohua Bai ◽

Baixing Peng ◽

Yongsheng Liu ◽

...

Keyword(s):

Magnetic Properties ◽

Core Shell ◽

Sintered Magnets ◽

Microstructure And Magnetic Properties

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Effect of Nitridation Magnetic Properties of Nanocrystalline Fe-Co Alloy Powders

Materials Science Forum ◽

10.4028/www.scientific.net/msf.654-656.1106 ◽

2010 ◽

Vol 654-656 ◽

pp. 1106-1109

Author(s):

Ya Qiong He ◽

Chang Hui Mao ◽

Jian Yang

Keyword(s):

Grain Size ◽

Magnetic Properties ◽

Alloy Powder ◽

High Energy ◽

X Ray Diffraction ◽

Powder Mixtures ◽

X Ray ◽

Transmission Electron ◽

Nitridation Temperature ◽

Microstructure And Magnetic Properties

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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Nanocrystalline Nd2Fe17synthesized by high-energy ball milling: crystal structure, microstructure and magnetic properties

Journal of Physics Condensed Matter ◽

10.1088/0953-8984/22/21/216005 ◽

2010 ◽

Vol 22 (21) ◽

pp. 216005 ◽

Cited By ~ 32

Author(s):

Pablo Álvarez ◽

Pedro Gorria ◽

Victorino Franco ◽

Jorge Sánchez Marcos ◽

María J Pérez ◽

...

Keyword(s):

Crystal Structure ◽

Magnetic Properties ◽

Ball Milling ◽

High Energy ◽

High Energy Ball Milling ◽

Energy Ball ◽

Microstructure And Magnetic Properties

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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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Effect of Dysprosium Content on the Magnetic Properties of Nanocrystalline (Pr0.25Nd0.75)10-xDyxFe82Co2B6 Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.789.28 ◽

2014 ◽

Vol 789 ◽

pp. 28-31 ◽

Cited By ~ 2

Author(s):

He Wei Ding ◽

Chun Xiang Cui ◽

Ji Bing Sun

Keyword(s):

Magnetic Properties ◽

Melt Spinning ◽

Maximum Energy ◽

Vibrating Sample Magnetometer ◽

X Ray ◽

Maximum Energy Product ◽

Energy Product ◽

Intrinsic Coercivity ◽

Electronic Microscope ◽

Microstructure And Magnetic Properties

(Pr0.25Nd0.75)10-xDyxFe82Co2B6(x=0~0.3) ribbons were prepared by melt spinning at 25m/s and subsequent annealing. The effect of Dy content on the microstructure and magnetic properties of the ribbons has been investigated by X-ray diffractometer (XRD), scanning electronic microscope (SEM) and vibrating sample magnetometer (VSM). The magnetic properties related to the Dy content were characterized. Intrinsic coercivity of 598kA/m, remanence of 0.58T, and the maximum energy product (BH)max of 43kJ/m3 were achieved in (Pr0.25Nd0.75)9.8Dy0.2Fe82Co2B6 after annealing at 700°C for 10 minutes.

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Microstructure and Magnetic Properties of Rapidly Solidified Sm(CobalFe0.11Cu0.10Zrx)7 Alloys

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.893.357 ◽

2014 ◽

Vol 893 ◽

pp. 357-360

Author(s):

Li Ya Li ◽

Yi Cheng Ge ◽

Yuan Dong Peng

Keyword(s):

Magnetic Properties ◽

Saturation Magnetization ◽

Systematic Study ◽

Structure Type ◽

Zr Addition ◽

Heat Treated ◽

Intrinsic Coercivity ◽

Structural And Magnetic Properties ◽

Rapidly Solidified ◽

Microstructure And Magnetic Properties

We reported a systematic study of the effect of Zr content on the structural and magnetic properties of rapidly quenched Sm (CobalFe0.11Cu0.10Zrx)7 alloys with x varying from 0 to 0.04. The results show that the addition of Zr greatly affected the microstructure and magnetic properties of the heat-treated ribbons. The Zr-free ribbon had crystallized as the 1:7H structure as the main phase while the ribbon with Zr addition adopted the 2:17R structure type. A Sm2Co7 phase was observed in the heat-treated ribbons when the Zr content x increased to 0.04. It is found that while the Zr content was increased from 0 to 0.04, saturation magnetization of the heat-treated ribbons was decreased from 11.9kGs to 3.3 kGs, and the intrinsic coercivity was increased from 0.07 kOe to 11.7 kOe. The highest intrinsic coercivity, Hci=11.7 kOe, was obtained in the ribbon with Zr content of 0.03.

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