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Effect of Temperature on the Plastic Deformability of Gas Atomized NdFeB Anisotropic Magnets

Cho Ju-Young, Choa Yong-Ho, Nam Sun-Woo, Rasheed Mohammad Zarar, Kim Taek-Soo

Archives of Metallurgy and Materials

2020

Vol. 65, iss. 4

1293--1296

NdFeB anisotropic sintered permanent magnets are typically fabricated by strip casting or melt spinning. In this study, the plastic deformability of an NdFeB alloy was investigated to study the possibility of fabricating anisotropic sintered magnets using gas atomized powders. The results show that the stoichiometric composition Nd12Fe82B6 softens at high temperatures. The aspect ratio and orientation factor of Nd12Fe82B6 billets after plastic deformation were found to increase with increasing plastic deformation temperature, particularly above 800°C. This confirms that softening at high temperatures can lead to plastic deformation of Nd2Fe14B hard magnetic phases.

Fabrication and characterization of transparent tin dioxide films with variable stoichiometric composition

Ksenevich V., Adamchuk D., Odzhaev V., Zukowski P.

Przegląd Elektrotechniczny

2016

R. 92, nr 8

187--189

Tin dioxide films with variable stoichiometric composition were fabricated by means of DC magnetron sputtering followed by a 2-stage annealing process. The structural and electrical properties of tin dioxide films were investigated by means of Raman spectroscopy and impedance spectroscopy, respectively. It was found that crystallinity and grain size of tin dioxide films increase with the increasing of annealing temperature. The most conductive samples were obtained at the annealing temperature 375°C on the 2-nd stage of the heat treatment procedure. Increasing of the impedance of films annealed at higher temperatures is explained by decrease of the concentration of oxygen vacancies.

Folie z dwutlenku cyny o zmiennym składzie stechiometrycznym zostały wytworzone za pomocą rozpylania magnetronowego przy użyciu prądu stałego oraz poddane dwuetapowemu wygrzewaniu. Właściwości strukturalne oraz elektryczne folii zostały zbadane przy użyciu spektroskopii ramanowskiej i spektroskopii impedancyjnej. Ustalono, że krystaliczność oraz rozmiary ziaren folii z dwutlenku cyny zwiększają się wraz ze wzrostem temperatury wygrzewania. Najbardziej przewodzące próbki zostały poddane wygrzewaniu w temperaturze 375°C w drugim etapie obróbki cieplnej. Wzrost impedancji folii wygrzanych w temperaturach wyższych jest związany ze zmniejszeniem koncentracji wakansów tlenu.

Nanocrystalline protective coatings with intermetallic phases applied by PLD method

Jóźwiak S., Durejko T., Bojar Z., Zasada D., Mróz W.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, Spec. is

323-327

Fe-Al and Ni-Al based intermetallic protective coatings technology is one of possibilities of functional properties improving, especially when machine elements are to be used in extreme conditions. Very good high-temperature corrosion resistance and abrasive wear resistance of intermetallics in a bulk form was a basic of laboratory trials with a purpose to obtain protective intermetallic coatings as a material perspective for tribological application. The results of investigations of FeAl and Ni3Al intermetallic phases based thin protective coatings, laser deposited on structural steel substrate, have been shown in this paper. The thickness, morphology and phase structure of coatings were analysed versus laser beam energy and other parameters of laser deposition process. Nanocrystalline, partially ordered structure of pulse laser deposited intermetallic coatings has been confirmed.