The effect of key process parameters on crystallographic texture and magnetic properties of PrFeB HD sintered magnets produced using high-energy milling

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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Magnetic properties of barium ferrite after milling by high energy milling (hem)

MATEC Web of Conferences ◽

10.1051/matecconf/201710101011 ◽

2017 ◽

Vol 101 ◽

pp. 01011

Author(s):

Novrita Idayanti ◽

Tony Kristiantoro ◽

Ardita Septiani ◽

Ika Kartika

Keyword(s):

Magnetic Properties ◽

Barium Ferrite ◽

High Energy ◽

High Energy Milling

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Magnetic Properties of Ni-Ferrite Produced by High Energy Milling

Ceramic Transactions Series - Characterization & Control of Interfaces for High Quality Advanced Materials ◽

10.1002/9781118406038.ch27 ◽

2012 ◽

pp. 219-227

Author(s):

M.E. Rabanal ◽

A. Vǎrez ◽

B. Levenfeld ◽

J.M. Torralba

Keyword(s):

Magnetic Properties ◽

High Energy ◽

High Energy Milling

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Investigation on the Improvement of Magnetic Properties by Hot Deformation Processes for NdFeB Magnets

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.626.317 ◽

2014 ◽

Vol 626 ◽

pp. 317-322 ◽

Cited By ~ 1

Author(s):

Yen Ju Chen ◽

Chao Cheng Chang ◽

Po Jen Hsiao ◽

Can Xun Chang

Keyword(s):

Plastic Deformation ◽

Magnetic Properties ◽

Strain Rate ◽

Process Parameters ◽

Effective Strain ◽

High Energy ◽

Experimental Results ◽

Ndfeb Magnets ◽

Energy Product ◽

Key Factor

Traditionally, NdFeB magnets with high remanent flux density or high energy product could only be manufactured through altering the material compounds. In recent years, studies indicated that the magnet properties of NdFeB magnets could be improved through plastic deformation. These studies pointed out that the degree of plastic deformation is a key factor to improve magnetic properties. However, there are still many other process parameters that could affect the magnetic properties either positively or negatively. In this paper, process parameters such as strain, strain rate, and temperature are studied to illustrate their influences on the magnetic properties of NdFeB magnets. The magnetic property could be greatly improved when the preferred orientation appears on the microstructure of deformed NdFeB magnets. One of the experimental results showed that the energy product value had been increased by 76.7% when the effective strain value had reached 0.65. Experimental results also showed that strain rate is a dominating factor with regard to the flow stress of material. Through a proper combination of these parameters, one can obtain NdFeB magnets with their magnetic properties greatly improved.

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