The Effect of Temperature on the Magnetic Properties of Hard Magnet Nd2Fe14B Produced by Hot Press Method

Authors

1 1. Department of Materials Engineering, Shahid Bahonar University, Kerman, Iran.

2 2. Department of Materials Engineering, Malek Ashtar Univrsity of Technology, Shahin Shahr, Iran.

3 3. Islamic Azad University Science and Research Branch, Tehran.

Abstract

NdFeB magnetic alloy is one of the hard magnets having the highest maximum energy in the world. The most popular methods of manufacturing magnetic alloys Nd2Fe14B are powder metallurgy and  rapid quenching techniques. In this research, the effect of  the hot press temperature on the magnetic properties of the  hard magnet Nd2Fe14B was studied. Structural studies were carried out using X-ray diffraction, X-ray fluorescence spectrometer and Scanning Electron Microscope; Spectroscopic energy distribution of Nd2Fe14B bulk magnet and the magnetic tests were done using a vibrating magnetometer to investigate the structures and the magnetic properties of the produced samples. The results showed that in addition to the Nd2Fe14B phase, the α-Fe and Nd-rich phase also existed in the structure of the provided magnet. These secondary phases had  effectively created exchange couplings with the main phase, improving the magnetic properties. The magnetic properties of the sintered magnets were improved by increasing the press temperature; finally, Nd2Fe14B magnet was made with the maximum energy, which was d higher than 290 kj/m3 .

Keywords

References

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Journal of Advanced Materials in Engineering (Esteghlal)
Volume 37, Issue 2
September 2018
Pages 13-27

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