Characterisation of plasma-sprayed SrFe12O19 coatings for electromagnetic wave absorption

K. Bobzin; G. Bolelli; M. Bruehl; Arto Hujanen; Pertti Lintunen; D. Lisjak; S. Gyergyek; L. Lusvarghi

doi:10.1016/j.jeurceramsoc.2011.02.003

Characterisation of plasma-sprayed SrFe₁₂O₁₉ coatings for electromagnetic wave absorption

K. Bobzin, G. Bolelli (Corresponding Author), M. Bruehl, Arto Hujanen, Pertti Lintunen, D. Lisjak, S. Gyergyek, L. Lusvarghi

Research output: Contribution to journal › Article › Scientific › peer-review

27 Citations (Scopus)

Abstract

SrFe₁₂O₁₉ coatings, intended as electromagnetic wave absorbers, were produced by atmospheric plasma spraying (APS) using two different kinds of feedstock powders: spray-dried agglomerates of micrometric SrFe₁₂O₁₉ particles (type-A) or spray-dried agglomerates of raw materials (SrCO₃, Fe₂O₃), reactively sintered at 1100 °C (type-B).

During spraying, type-A agglomerates either remain unmelted, producing porous coating regions where crystalline hexaferrite is retained, or are disrupted into smaller granules which melt completely, resulting in dense coating regions with no crystalline hexaferrite.

The sintered type-B agglomerates possess higher cohesive strength and do not fall apart: the finer ones melt completely, whereas, in the larger ones, the outer region melts and infiltrates the porous unmelted core which retains crystalline hexaferrite. Dense coatings can therefore be obtained while preserving high amounts of crystalline hexaferrite even inside the dense areas. Such coatings show magnetic properties that are promising for electromagnetic wave absorption applications.

Original language	English
Pages (from-to)	1439-1449
Number of pages	11
Journal	Journal of the European Ceramic Society
Volume	31
Issue number	8
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2011.02.003
Publication status	Published - 2011
MoE publication type	A1 Journal article-refereed

Keywords

Ferrites
Atmospheric plasma spraying
Magnetic properties
Functional applications
Hard magnets
ProperPart

Access to Document

10.1016/j.jeurceramsoc.2011.02.003

Cite this

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title = "Characterisation of plasma-sprayed SrFe12O19 coatings for electromagnetic wave absorption",

abstract = "SrFe12O19 coatings, intended as electromagnetic wave absorbers, were produced by atmospheric plasma spraying (APS) using two different kinds of feedstock powders: spray-dried agglomerates of micrometric SrFe12O19 particles (type-A) or spray-dried agglomerates of raw materials (SrCO3, Fe2O3), reactively sintered at 1100 °C (type-B).During spraying, type-A agglomerates either remain unmelted, producing porous coating regions where crystalline hexaferrite is retained, or are disrupted into smaller granules which melt completely, resulting in dense coating regions with no crystalline hexaferrite.The sintered type-B agglomerates possess higher cohesive strength and do not fall apart: the finer ones melt completely, whereas, in the larger ones, the outer region melts and infiltrates the porous unmelted core which retains crystalline hexaferrite. Dense coatings can therefore be obtained while preserving high amounts of crystalline hexaferrite even inside the dense areas. Such coatings show magnetic properties that are promising for electromagnetic wave absorption applications.",

keywords = "Ferrites, Atmospheric plasma spraying, Magnetic properties, Functional applications, Hard magnets, ProperPart",

author = "K. Bobzin and G. Bolelli and M. Bruehl and Arto Hujanen and Pertti Lintunen and D. Lisjak and S. Gyergyek and L. Lusvarghi",

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AU - Bobzin, K.

AU - Bolelli, G.

AU - Bruehl, M.

AU - Hujanen, Arto

AU - Lintunen, Pertti

AU - Lisjak, D.

AU - Gyergyek, S.

AU - Lusvarghi, L.

PY - 2011

Y1 - 2011

N2 - SrFe12O19 coatings, intended as electromagnetic wave absorbers, were produced by atmospheric plasma spraying (APS) using two different kinds of feedstock powders: spray-dried agglomerates of micrometric SrFe12O19 particles (type-A) or spray-dried agglomerates of raw materials (SrCO3, Fe2O3), reactively sintered at 1100 °C (type-B).During spraying, type-A agglomerates either remain unmelted, producing porous coating regions where crystalline hexaferrite is retained, or are disrupted into smaller granules which melt completely, resulting in dense coating regions with no crystalline hexaferrite.The sintered type-B agglomerates possess higher cohesive strength and do not fall apart: the finer ones melt completely, whereas, in the larger ones, the outer region melts and infiltrates the porous unmelted core which retains crystalline hexaferrite. Dense coatings can therefore be obtained while preserving high amounts of crystalline hexaferrite even inside the dense areas. Such coatings show magnetic properties that are promising for electromagnetic wave absorption applications.

AB - SrFe12O19 coatings, intended as electromagnetic wave absorbers, were produced by atmospheric plasma spraying (APS) using two different kinds of feedstock powders: spray-dried agglomerates of micrometric SrFe12O19 particles (type-A) or spray-dried agglomerates of raw materials (SrCO3, Fe2O3), reactively sintered at 1100 °C (type-B).During spraying, type-A agglomerates either remain unmelted, producing porous coating regions where crystalline hexaferrite is retained, or are disrupted into smaller granules which melt completely, resulting in dense coating regions with no crystalline hexaferrite.The sintered type-B agglomerates possess higher cohesive strength and do not fall apart: the finer ones melt completely, whereas, in the larger ones, the outer region melts and infiltrates the porous unmelted core which retains crystalline hexaferrite. Dense coatings can therefore be obtained while preserving high amounts of crystalline hexaferrite even inside the dense areas. Such coatings show magnetic properties that are promising for electromagnetic wave absorption applications.

KW - Ferrites

KW - Atmospheric plasma spraying

KW - Magnetic properties

KW - Functional applications

KW - Hard magnets

KW - ProperPart

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DO - 10.1016/j.jeurceramsoc.2011.02.003

M3 - Article

SN - 0955-2219

VL - 31

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EP - 1449

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 8