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Soft magnetic composite base on ferromagnetic core and NiFe2O4 shell
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SYSNO ASEP 0435594 Document Type A - Abstract R&D Document Type Není vybrán druh dokumentu Title Soft magnetic composite base on ferromagnetic core and NiFe2O4 shell Author(s) Strečková, M. (SK)
Hadraba, Hynek (UFM-A) RID, ORCID
Roupcová, Pavla (UFM-A) RID, ORCID
Bureš, R. (SK)Number of authors 4 Source Title Deformation and fracture in PM materials DFPM2014, Book of abstracts. - Košice : Institute of Materials Research of the Slovak Academy of Sciences in Košice, Slovak Republic, 2014 / Beata Ballóková ; Katarína Ondrejová ; Marcela Selecká - ISBN 978-80-970964-8-9
S. 31Number of pages 1 s. Action DF PM 2014 Internatinal Conference Deformation and Fracture in PM Materials Event date 26.10.2014-29.10.2014 VEvent location Stará Lesná Country SK - Slovakia Event type EUR Language eng - English Country SK - Slovakia Keywords soft magnetic composite ; spinel ferrite ; FeSi ; Permalloy type particles Subject RIV JG - Metallurgy R&D Projects GA14-25246S GA ČR - Czech Science Foundation (CSF) Institutional support UFM-A - RVO:68081723 Annotation Soft magnetic composite (SMCs) are basically designed as a ferromagnetic powder surrounded by thin electrically insulating layer. The formed dielectric layer may have an organic or inorganic nature. The advantage of widely use of organic binders lie in the smart preparation of composites, high density of final green compacts but the thermal treatment temperature is strictly limited by the thermal resistance of the organic insulating material which is not high enough for removing some plastic deformation creates after compaction step in the green compact. The sufficient heat treatment permits low volume fractions of defects, reduce the distortion within the particles, lowers the dislocation density and thereby increase the magnetic permeability. To achieve this purpose, electrically resistant materials, for example the spinel ferrites with acceptable magnetic properties are suitable candidates for SMCs preparation. In the present work, the spinel nickel ferrite NiFe2O4 was created on FeSi and Permalloy type particles by precipitation of chloride precursors from alkaline solution. The modified preparation of NiFe2O4 ferrite coating was synthesized by low temperature route, withouth any surfactant and multiple steps directly on the ferromagnetic powder. The created layer was extracted by FIB and examined by SEM, TEM and XRD analysis. The final powder was compacted at 400 MPa by one axis compression and the electrical resistivity was studied. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2015
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