lajos k. varga
DESCRIPTION
Lajos K. Varga. Research Institute of Solid State Physics and Optics of Hungarian Academy of Sciences. Proposal full title: Amorphous Metal-Insulator type soft magnetic composites Proposal acronym: AMINMAG Date of preparation: 10.09.2004 - PowerPoint PPT PresentationTRANSCRIPT
Lajos K. Varga
Research Institute of Solid State Physics and Optics of
Hungarian Academy of Sciences
Proposal full title:
Amorphous Metal-Insulator type soft magnetic composites
Proposal acronym: AMINMAGDate of preparation: 10.09.2004
Type of Instrument STREP (Specific Targeted Research project) Submission stage: OUTLINE proposal
Activity code addressed: NEST-2003-1 ADVENTURE
Duration of the project: 36 months
(FeSi, FeAl, permalloy) commercialized 100 years ago (Mn-Zn and Ni-Zn ferrites) commercialized 50 years ago amorphous alloys 25 years ago nanocrystalline alloys about 10 years ago
Limitations: eddy current losses - metals low temperature limit – ferrites
Solution: a metal - insulator nanocomposite -metaferrite
Adventure: to prove the theoretical prediction:
The exchange interaction can be replaced by the extended dipolar interaction in averaging out the local anisotropies and so producing a soft magnetic material.
.16
3/4
0
22
xDJ
A sd
.111
63/1
641
4
6
damcr
effAA
x
ADKxK
K1 ~ (8-48) 103 J/m3
<K> ~ 1-10 J/m3
Experimental techniques:
1. Gas atomizing ferromagnetic bulk amorphous alloy (FBA)+ Coating with Mg or Zn by vapor deposition and oxidation of Mg or Zn. + Compaction between Tg and Tx.
2. Spray forming of FBA with ZrO or Al2O33. Plasma spray of FBA with ZrO or Al2O34. Preparation of composite oxides (e.g. Fe(Co)-M-O, where
M = Al, Zn, or Si) by mechanical milling + cold compaction+ sintering and precipitation of nanosized Fe(Co) particles by subsequent heat treatment
5. Reduction of Fe(Co) nanosized oxide powder in H2 fluidizing bed+Coating with Mg or Zn by vapor deposition and oxidation of Mg or Zn+compaction by hot isostatic pressure
AbstractBad:
The project proposed aims to explore the concept of novel metal-insulator composite materials consisting of the “active” amorphous magnetic particles embedded in a host insulator matrix, which are expected to exhibit excellent soft magnetic properties both at high-frequencies (up to 1 GHz) and at high temperatures (up to 300-400 oC), thus meeting the needs of modern telecommunication systems and power electronics.
Good:
The proposal aims to realize a scientific and technological break-through in the field of high frequency and high temperature soft magnetic materials developing a new meta- material consisting of the “active” amorphous magnetic particles embedded in a host insulator matrix making possible new applications in informatics and power electronics at high-frequencies (up to 1 GHz) and at high temperatures (up to 300-400 oC.
Bad:
No interdisciplinarity
No industrial partner
No prediction of the economical benefit