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 journalArticleScientificpeer-review

20 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 languageEnglish
Pages (from-to)1439-1449
Number of pages11
JournalJournal of the European Ceramic Society
Volume31
Issue number8
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

Fingerprint

Electromagnetic wave absorption
Sprayed coatings
Plasmas
Coatings
Crystalline materials
Plasma spraying
Spraying
Electromagnetic waves
Powders
Feedstocks
Magnetic properties
Raw materials

Keywords

  • Ferrites
  • Atmospheric plasma spraying
  • Magnetic properties
  • Functional applications
  • Hard magnets
  • ProperPart

Cite this

Bobzin, K. ; Bolelli, G. ; Bruehl, M. ; Hujanen, Arto ; Lintunen, Pertti ; Lisjak, D. ; Gyergyek, S. ; Lusvarghi, L. / Characterisation of plasma-sprayed SrFe12O19 coatings for electromagnetic wave absorption. In: Journal of the European Ceramic Society. 2011 ; Vol. 31, No. 8. pp. 1439-1449.
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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.",
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Characterisation of plasma-sprayed SrFe12O19 coatings for electromagnetic wave absorption. / Bobzin, K.; Bolelli, G. (Corresponding Author); Bruehl, M.; Hujanen, Arto; Lintunen, Pertti; Lisjak, D.; Gyergyek, S.; Lusvarghi, L.

In: Journal of the European Ceramic Society, Vol. 31, No. 8, 2011, p. 1439-1449.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Characterisation of plasma-sprayed SrFe12O19 coatings for electromagnetic wave absorption

AU - Bobzin, K.

AU - Bolelli, G.

AU - Bruehl, M.

AU - Hujanen, Arto

AU - Lintunen, Pertti

AU - Lisjak, D.

AU - Gyergyek, S.

AU - Lusvarghi, L.

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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.

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