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conferenceseries
.com
Volume 5, Issue 6 (Suppl)
J Mat. Sci.
ISSN: 2321-6212
Advanced Materials 2017
October 26-28, 2017
OCTOBER 26-28, 2017 OSAKA, JAPAN
13
TH
INTERNATIONAL CONFERENCE ON
Advanced Materials and Nanotechnology
Towards minimizing the consumption of Heavy Rare Earths in the processing of Nd-Fe-B permanent
magnets by electrophoretic deposition
Marko Soderznik
Jozef Stefan Institute, Slovenia
W
ith their high performance, Nd-Fe-B sintered permanent magnets are the most promising candidates for a variety of
transportation application. Heavy Rare Earths (HRE), such as Dy or Tb are inevitably used in Nd-Fe-B permanent
magnets that exhibit high magnetic performance at elevated temperatures. Particularly, high coercivity of the magnets is
important to oppose high demagnetization fields, caused in the electromotor. Drastic reduction of Dy or Tb consumption was
achieved by using the grain-boundary diffusion process initiated by the electrophoretic deposition of nano TbF
3
particles. At
the same time, the magnetic properties remained unaffected. Commercially available Nd-Fe-B magnets were coated by EPD
with nano TbF
3
. Scanning electron microscopy revealed uniform layer of nano TbF
3
which was well attached to the surface
of the magnet. Good adhesion of powder is one of the main quality parameters for the successful grain-boundary diffusion
process. Compared to simple dip-coating, EPD gives better adhesion of TbF
3
powder and consequently higher coercivity
after the GBDP. The coercivity achieved after the EPD-based GBDP was 1536 kA/m at 75°C, which is nearly twice that of
the uncoated sintered magnet and 1.5 times higher than that for the uncoated magnet exposed to the same heat treatment.
To measure the accurate amounts of the elements, especially Tb, the chemical composition was determined with induction
coupled plasma optical electron spectroscopy (ICP-OES). The microstructural investigation was done with a high- resolution
field emission SEM. Core-shell-type microstructure was formed after the processing.
Biography
Marko Soderznik has completed his PhD at Jozef Stefan International Postgraduate School, Slovenia. He was a Postdoctoral Researcher at the National Institute
for Materials Science in Tsukuba, Japan where he was studying magnetic domains and he is currently a Postdoctoral Researcher at Jožef Stefan Institute, Slovenia.
He is the author or co-author of more than 30 scientific contributions and patents and a leader of Postdoctoral research project funded by the Slovenian Research
Agency.
marko.soderznik@ijs.siMarko Soderznik, J Mat. Sci. 2017, 5:6
DOI: 10.4172/2321-6212-C1-008