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1

Structure and Properties of Nd-Fe-B Alloy Subjected to HDDR Process

Szymański M., Michalski B., Leonowicz M., Miazga Z.

Archives of Metallurgy and Materials

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2016

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Vol. 61, iss. 1

217--220

EN

In this paper the Hydrogenation, Disproportionation, Desorption and Recombination (HDDR) route was tested, for the Nd-Fe-B master alloy, as a prospective procedure for recycling of sintered scrap neodymium magnets. The HDDR method is based on the hydrogen induced reversal phase transformation of Nd-Fe-B alloy: Nd2Fe14B + (2±x) H2 = 2NdH2±x + Fe2B + 12Fe. Microstructural observations (SEM), phase constitution studies (XRD) and measurement of magnetic properties (VSM) were done to investigate the HDDR transformation progress. It was observed that disproportionation reaction starts at the grain boundaries, where the Nd-rich phase is located. Average grain size was reduced and coercive material was produced as a result of the HDDR process. Obtained results are similar to literature data.

2

Effect Of The Desorption-Recombination Temperature On The Microstructure And Magnetic Properties Of HDDR Processed Nd-Fe-B Powders

Lee J.-G., Cha H.-R., Liu S., Yu J.-H., Baek Y.-K., Kwon H.-W.

Archives of Metallurgy and Materials

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2015

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Vol. 60, iss. 2B

1499--1501

EN

The effect of the desorption-recombination temperature on the microstructure and magnetic properties of hydrogenation-disproportionation-desorption-recombination (HDDR) processed Nd-Fe-B powders was studied. The NdxB6.4Ga0.3Nb20.2Febal (x=12.5-13.5, at.%) casting alloys were pulverized after homogenizing annealing, and then subjected to HDDR treatment. During the HDDR process, desorption-recombination (DR) reaction was induced at two different temperature, 810°C and 820°C. The higher Nd content resulted in enhanced coercivity of the HDDR powder, and which was attributed to the thicker and more uniform Nd-rich phase along grain boundaries. But this uniform Nd-rich phase induced faster grain growth. The remanence of the powder DR-treated at 820°C is higher than that DR-treated at 810°C. In addition, it was also confirmed that higher DR temperature is much more effective to improve squareness.

3

Budowa, własności, wytwarzanie i zastosowanie nanomateriałów

Pałka J.

Rudy i Metale Nieżelazne

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2007

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R. 52, nr 1

23-32

PL

Przedstawiono wybrane zagadnienia dotyczące nanotechnologii i nanomateriałów. Omówiono pojęcia wchodzące w skład nanonauki. Opisano budowę, właściwości, metody wytwarzania oraz przykłady zastosowania i metody badań nanomateriałów.

EN

Selected topics related to nanotechnology and nanomaterials have been presented. The concept of nanoscience was discussed. The structure, chemical properties, methods of production and examples of practical apllication and research methods were discribed.