<div class="csl-bib-body">
<div class="csl-entry">Eisenmenger-Sittner, C., Böhm, D., Zuzek, K., & Burkhardt, C. (2025, September 16). <i>Surface coating of single grains of Nd-Fe-B powder for high performance magnets</i> [Conference Presentation]. 23rd International Vacuum Congress (IVC-23), Sydney, Australia.</div>
</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/223472
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dc.description.abstract
High-performance permanent magnets made of rare earths (Nd-Fe-B) are key components for electric vehicles and wind turbines. The Nd-rich grain boundary that forms during the consolidation process is vital for the performance of the magnets. This study aims to carefully modify the interface of each individual grain by coating its surface. A specially designed sputtering system for granular materials is used to deposit a thin metal film (e.g. copper) on each grain of the loose Nd2Fe14B powder. For optimum magnetic performance and manufacturing, only trace amounts of copper (about 0.1 atomic percent) have a positive effect, so other materials (e.g.neodymium) need to be added to the grain boundary. A uniform coating of the powder surface is achieved by putting the powder in a rotating container that is periodically concussed to avoid agglomerates. The average size of the grains is in the range of 5-10 μm with an applied coating thickness of 3-9 nm of copper. Predicting the coating thickness on individual grains is critical and a calculation method is used that takes into account the periodically changing powder surface exposed to the vapor beam. The current calculation method is extended by considering the local number of particles reaching the exposed powder surface. The evaluation of the thickness and its uniformity is performed by gravimetry, optical microscopy, electron microscopy, energy dispersive X-ray and electrical resistivity measurement. The electrical resistance of the coated grains is measured under external load, whereby a thickness-dependent behavior is to be expected.
en
dc.language.iso
en
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dc.subject
Laser reflection
en
dc.subject
sputter target poisoning
en
dc.title
Surface coating of single grains of Nd-Fe-B powder for high performance magnets
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.contributor.affiliation
Jožef Stefan Institute, Slovenia
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dc.contributor.affiliation
Jožef Stefan International Postgraduate School, Slovenia
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dc.type.category
Conference Presentation
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tuw.researchTopic.id
M2
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tuw.researchTopic.id
M1
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tuw.researchTopic.name
Materials Characterization
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tuw.researchTopic.name
Surfaces and Interfaces
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tuw.researchTopic.value
50
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tuw.researchTopic.value
50
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tuw.publication.orgunit
E138-03 - Forschungsbereich Functional and Magnetic Materials
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tuw.author.orcid
0000-0002-7096-6092
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tuw.author.orcid
0000-0003-2652-1966
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tuw.author.orcid
0000-0001-6336-9815
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tuw.event.name
23rd International Vacuum Congress (IVC-23)
en
tuw.event.startdate
15-09-2025
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tuw.event.enddate
19-09-2025
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tuw.event.online
On Site
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tuw.event.type
Event for scientific audience
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tuw.event.place
Sydney
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tuw.event.country
AU
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tuw.event.presenter
Eisenmenger-Sittner, Christoph
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tuw.event.presenter
Böhm, David
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wb.sciencebranch
Physik, Astronomie
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wb.sciencebranch.oefos
1030
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wb.sciencebranch.value
100
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item.openairetype
conference paper not in proceedings
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item.openairecristype
http://purl.org/coar/resource_type/c_18cp
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item.cerifentitytype
Publications
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item.languageiso639-1
en
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item.grantfulltext
none
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item.fulltext
no Fulltext
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crisitem.author.dept
E138-03 - Forschungsbereich Functional and Magnetic Materials
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crisitem.author.dept
E138-03 - Forschungsbereich Functional and Magnetic Materials
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crisitem.author.dept
Jožef Stefan Institute, Slovenia
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crisitem.author.dept
Jožef Stefan International Postgraduate School, Slovenia
