Pressure effect on hydrogen absorption by Nd–Fe–B magnets during HD and HDDR

• Autorzy: Szymański M. , Michalski B. , Leonowicz M. , Miazga Z.

Identyfikatory

DOI

10.15199/28.2016.5.9

Warianty tytułu

PL

Wpływ ciśnienia na absorbcję wodoru przez magnesy Nd–Fe–B w procesach HD i HDDR

• Języki publikacji: EN

Abstrakty

EN

Scrap, sintered Nd–Fe–B magnets were subjected to hydrogen treatments of Hydrogen Decrepitation (HD) and Hydrogenation–Disproportion–Desorption and Recombination (HDDR) route. In HD treatments, increasing hydrogen pressure from 100 kPa up to 200 kPa at room temperature, does not affect particles size distribution but accelerates the reaction by decreasing the incubation time. In this study a faster HD process is reported when fresh materials are provided compared to one week stored ones. As part of the exothermic nature of the HD process, the increment of temperature was registered. The temperature rise was slightly higher for the fresh material (close to 2°C) comparing with the one week stored material (around 1.5°C). Hydrogen absorption was analysed during the HDDR process carried out at 850°C under three hydrogen pressures: 30, 100 and 200 kPa. For 30 kPa, due to hydrogen consumption, additional refilling was necessary, while other tested pressures were high enough to avoid additional refilling during the HDDR.

PL

Praca miała na celu określenie wpływu ciśnienia na stopień rozdrobienia magnesów Nd–Fe–B w procesie kruszenia wodorowego HD (Hydrogen Decrepitation) oraz wpływu ciśnienia na przebieg absorpcji wodoru w trakcie procesu wodorowania HDDR (Hydrogenation, Disproportionation, Desorption and Recombination). Zakres badań obejmował: przeprowadzenie procesów HD, określenie efektu termicznego, analizę wielkości cząstek proszku uzyskanego po procesie, zbadanie wpływu ciśnienia na szybkość inicjacji procesu HD oraz przeprowadzenie procesów wodorowania HDDR i analizę absorpcji wodoru.

Słowa kluczowe

EN

hydrogen decrepitation; hydrogenation–disproportionation–desorption and recombination; hydrogen absorption

PL

wodorowanie; kruszenie wodorowe

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2016
• Tom: Vol. 37, nr 5
• Strony: 258--262
• Opis fizyczny: Bibliogr. 13 poz., fig., tab.

Twórcy

autor

Szymański M.

• Warsaw University of Technology, Faculty of Materials Science and Engineering, Warsaw, Poland

autor

Michalski B.

• Warsaw University of Technology, Faculty of Materials Science and Engineering, Warsaw, Poland

autor

Leonowicz M.

• Warsaw University of Technology, Faculty of Materials Science and Engineering, Warsaw, Poland

autor

Miazga Z.

• P.P.H.U. Polblume Zbigniew Miazga, Piaseczno, Poland

Bibliografia

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• [3] Zakotnik M., Devlin E., Harris I. R., Williams A. J.: Hydrogen decrepitation and recycling of Nd–Fe–B-type sintered magnets. J. Iron Steel Res. Int. 13 (2006) 289÷295.
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• [9] Gutfleisch O., Harris I. R.: Fundamental and practical aspects of the hydrogenation, disproportionation, desorption and recombination process. J. Phys. D: Appl. Phys. 29 (1996) 2255÷2265.
• [10] Szymański M., Michalski B., Leonowicz M., Miazga Z.: Recycling of Nd–Fe–B magnets from scrap hard disc drives. Key Eng. Mat. 682 (2016) 308÷313.
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• [12] Saje B., Holc J., Beseničar S.: Hydrogenation process of Nd–Dy–Fe–B alloy. J. Mater. Sci. 27 (1992) 2682÷2686.
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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.