Version 1
: Received: 11 July 2024 / Approved: 12 July 2024 / Online: 12 July 2024 (12:49:46 CEST)
How to cite:
Marinca, T. F.; Cotojman, L.; Popa, F.; Neamțu, B. V.; Prică, C. V.; Chicinaș, I. Pseudo Core-Shell Permalloy (Supermalloy)@ZnFe2O4 Powders and Spark Plasma Sintered Compacts Based on Mechanically Alloyed Powders. Preprints2024, 2024071017. https://doi.org/10.20944/preprints202407.1017.v1
Marinca, T. F.; Cotojman, L.; Popa, F.; Neamțu, B. V.; Prică, C. V.; Chicinaș, I. Pseudo Core-Shell Permalloy (Supermalloy)@ZnFe2O4 Powders and Spark Plasma Sintered Compacts Based on Mechanically Alloyed Powders. Preprints 2024, 2024071017. https://doi.org/10.20944/preprints202407.1017.v1
Marinca, T. F.; Cotojman, L.; Popa, F.; Neamțu, B. V.; Prică, C. V.; Chicinaș, I. Pseudo Core-Shell Permalloy (Supermalloy)@ZnFe2O4 Powders and Spark Plasma Sintered Compacts Based on Mechanically Alloyed Powders. Preprints2024, 2024071017. https://doi.org/10.20944/preprints202407.1017.v1
APA Style
Marinca, T. F., Cotojman, L., Popa, F., Neamțu, B. V., Prică, C. V., & Chicinaș, I. (2024). Pseudo Core-Shell Permalloy (Supermalloy)@ZnFe2O4 Powders and Spark Plasma Sintered Compacts Based on Mechanically Alloyed Powders. Preprints. https://doi.org/10.20944/preprints202407.1017.v1
Chicago/Turabian Style
Marinca, T. F., Călin Virgiliu Prică and Ionel Chicinaș. 2024 "Pseudo Core-Shell Permalloy (Supermalloy)@ZnFe2O4 Powders and Spark Plasma Sintered Compacts Based on Mechanically Alloyed Powders" Preprints. https://doi.org/10.20944/preprints202407.1017.v1
Abstract
Soft magnetic composites cores were produced by Spark Plasma Sintering (SPS) from Ni3Fe@ZnFe2O4 and NiFeMo@ZnFe2O4 pseudo-core-shell powders. In the Fe-Ni alloys@ZnFe2O4 pseudo-core-shell composite powders, the core is a large nanocrystalline Permalloy or Supermalloy particle obtained by mechanical alloying, and the shell is a pseudo continuously layer of Zn ferrite particles. The pseudo-core-shell powders have been compacted by SPS at temperatures between 500-700 ºC, with a holding time of 0 minutes. Several techniques were used for the characterisation of the powders and sintered compacts: X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, magnetic hysteresis measurements (DC and AC) and electrical resistivity. The electrical resistivity is stabilised at values of about 7·10-3 Ω·m for sintering temperatures between 600-700 °C and this value is 3 orders of magnitude higher than the electrical resistivity of sintered Fe compacts. The best relative initial permeability was obtained for the Supermalloy/ZnFe2O4 composite compacts sintered at 600 ºC, which decreases linearly for the entire frequency range studied, from around 95 to 50. Up a frequency of 2,000 Hz the power losses are lower than 1.5 W/kg. At the frequency of 10 kHz, the power losses are larger, but they remain at a low level. In the case of Supermalloy/ZnFe2O4 composite compact SPS-ed at 700 °C, the specific power losses are even lower than 5 W/kg. The power losses decomposition proved that intra-particles losses give the main part of the losses.
Keywords
pseudo-core-shell particles; soft magnetic composites; spark plasma sintering
Subject
Chemistry and Materials Science, Metals, Alloys and Metallurgy
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
