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Wpływ ciśnienia na absorbcję wodoru przez magnesy Nd–Fe–B w procesach HD i HDDR
Języki publikacji
Abstrakty
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.
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.
Wydawca
Czasopismo
Rocznik
Tom
Strony
258--262
Opis fizyczny
Bibliogr. 13 poz., fig., tab.
Twórcy
autor
- Warsaw University of Technology, Faculty of Materials Science and Engineering, Warsaw, Poland
autor
- Warsaw University of Technology, Faculty of Materials Science and Engineering, Warsaw, Poland
autor
- Warsaw University of Technology, Faculty of Materials Science and Engineering, Warsaw, Poland
autor
- P.P.H.U. Polblume Zbigniew Miazga, Piaseczno, Poland
Bibliografia
- [1] Report on critical raw materials for the EU available at: http://ec.europa. eu/DocsRoom/documents/10010/attachments/1/translations/en/renditions/ native.
- [2] Rivoirard S., Noudem J. G., de Rango P., Fruchart D., Liesert S., Soubeyroux J. L.: Anisotropic and coercive powder for bonded magnets. Proc. 16th Int. Workshop on Rare-Earth Magnets and Their Applications (Sendai Japan) (2000) 347.
- [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.
- [4] Harris I. R., Evans J., Nyholm P. S.: Br Patent 1,554,384 (1979).
- [5] Oesterreicher K., Oesterreicher H.: Structure and magnetic properties of Nd2Fe14BH2.7. Phys. Status. Solidi A 85 (1984) K61÷K64.
- [6] Walton A., Yi H., Mann V. S. J., Bevan A. I., Speight J. D., Harris I. R., Williams A. J.: The use of hydrogen to separate and recycle NdFeB magnets from electronic waste. Proceedings of the 22nd International Workshop on Rare-Earth Permanent Magnets and their Applications (2012) 10÷13.
- [7] Takeshita T., Nakayama R.: Magnetic properties and microstructures of the NdFeB magnet powder produced by hydrogen treatment. Proceedings of the 10th International Workshop on Rare-Earth Magnets and their Applications (1989) 551÷557.
- [8] Sheridan R. S., Williams A. J., Harris I. R., Walton A.: Improved HDDR processing route for production of anisotropic powder from sintered NdFeB type magnets. J. Magn. Magn. Mater. 350 (2014) 114÷118.
- [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.
- [11] Szymański M., Michalski B., Leonowicz M., Miazga Z.: Structure and properties of Nd–Fe–B alloy subjected to HDDR process. Arch. Metall. Mater. 61 (2016) 217÷220.
- [12] Saje B., Holc J., Beseničar S.: Hydrogenation process of Nd–Dy–Fe–B alloy. J. Mater. Sci. 27 (1992) 2682÷2686.
- [13] Rybalka S. B., Goltsov V. A., Didus V. A., Fruchart D.: Fundamentals of the HDDR treatment of Nd2Fe14B type alloys. Journal of Alloys and Compounds 356-357 (2003) 390÷394.
Uwagi
Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-62c24b7c-1e1f-46ed-b63d-84cb422779ea