Enhanced soft magnetic properties with high frequency stability of pure iron powder cores via high-pressure compaction - An environment and cost saving solution as a prospective alternative to soft magnetic composites

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10493595" target="_blank" >RIV/00216208:11320/24:10493595 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=g4zUKWzCsT" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=g4zUKWzCsT</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mtsust.2024.100974" target="_blank" >10.1016/j.mtsust.2024.100974</a>

Result language

angličtina

Original language name

Enhanced soft magnetic properties with high frequency stability of pure iron powder cores via high-pressure compaction - An environment and cost saving solution as a prospective alternative to soft magnetic composites

Original language description

The paper presents the analysis of the magnetic behaviour of soft magnetic powder compacts vs. the increasing compacting pressure. An unexpectedly positive result was obtained at a pressure of 1500 MPa, as the pure iron compact without coating of powder particles and without subsequent heat treatment showed very good magnetic properties compared to the class of soft magnetic composites (SMCs). In particular, the effective relative permeability of mu(eff) similar to 120, stable up to a frequency f similar to 200 kHz, the maximum total relative permeability of mu(max)(tot) similar to 700, and the specific electrical resistivity of rho(R) similar to 10(-5) Omega m. This phenomenon was explained on the basis of analyses of the samples microstructure, the magnetic and electrical properties, magnetization processes, inner demagnetizing fields, Barkhausen noise and thermal diffusivity. It was found that the grain size refinement inside iron particles occurs at certain elevated compaction pressure because the deformation bands gradually rise and break up with compaction pressure, leading to a higher resistivity of the compact thus to its SMC-like behaviour, despite the counteracting effect of increasing number of iron-iron bridges among neighbouring particles. The grain size refinement causes also the refinement of magnetic domain structure, which facilitates the magnetization reversal, although, the increased internal stresses and microstructural defects affect domain wall mobility negatively. The most favourable combination of the mentioned factors influences, finally resulting in the soft magnetic properties enhancement, appeared at 1500 MPa. Due to high-pressure compaction, the high density (above similar to 95 % of iron density) of a compact was achieved, ensuring sufficient mechanical properties. The presented material can serve as a potential supplanter of SMCs in many applications as it provides evident advantages, such as its easy production with minimum chemical waste (because any additional chemical processes and substances needed for particle coatings in conventional SMCs are completely omitted), as well as easy recycling process, which makes it eco-friendly and cost-effective, nevertheless, maintaining the advantages of SMCs.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Materials Today Sustainability

ISSN

2589-2347

e-ISSN

—

Volume of the periodical

28

Issue of the periodical within the volume

09

Country of publishing house

GB - UNITED KINGDOM

Number of pages

13

Pages from-to

100974

UT code for WoS article

001316752100001

EID of the result in the Scopus database

2-s2.0-85203622795