The preparation of barium hexaferrite coatings using HVOF

D. Lisjak (Corresponding Author), D. Makovec, S. Gyrgyek, Arto Hujanen, Pertti Lintunen, Tommi Varis, G. Bolelli, L. Lusvarghi, M. Drofenik

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Thick coatings of barium hexaferrite with the compositions BaFe12O19 and BaCoTiFe10O19 were prepared using high‐velocity oxygen‐fuel (HVOF) spraying technology. Nanocrystalline precursors embedded in an amorphous matrix were obtained on both Fe and glass–ceramic substrates. To promote the crystallization of the hexaferrites, the coatings were annealed at 800°–1000°C, and single‐phase coatings were obtained at 1000°C. The crystallization process was studied with X‐ray powder diffraction and with electron microscopy. The magnetic measurements of the coatings were carried out in a static field and at high frequencies. The magnetization of the coatings increased with the annealing temperature to above 50 emu/g for both compositions. The coercivity of BaFe12O19 increased with the annealing temperature to above 2400 Oe, whereas the coercivity of BaCoTiFe10O19 decreased from over 800 Oe, for the as‐deposited sample, to 400 Oe for the sample annealed at 1000°C. A minimum 90% absorption was calculated for the BaFe12O19 coatings with thicknesses of 0.15–0.25 mm at around 47 GHz and for the 1–4‐mm‐thick coatings of BaCoTiFe10O19 at 3–9 GHz.
Original languageEnglish
Pages (from-to)818-824
Number of pages7
JournalJournal of the American Ceramic Society
Volume92
Issue number4
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

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Barium
Coatings
Crystallization
Coercive force
Annealing
Magnetic variables measurement
Spraying
barium hexaferrite
Chemical analysis
Electron microscopy
Magnetization
Temperature
Substrates

Cite this

Lisjak, D. ; Makovec, D. ; Gyrgyek, S. ; Hujanen, Arto ; Lintunen, Pertti ; Varis, Tommi ; Bolelli, G. ; Lusvarghi, L. ; Drofenik, M. / The preparation of barium hexaferrite coatings using HVOF. In: Journal of the American Ceramic Society. 2009 ; Vol. 92, No. 4. pp. 818-824.
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title = "The preparation of barium hexaferrite coatings using HVOF",
abstract = "Thick coatings of barium hexaferrite with the compositions BaFe12O19 and BaCoTiFe10O19 were prepared using high‐velocity oxygen‐fuel (HVOF) spraying technology. Nanocrystalline precursors embedded in an amorphous matrix were obtained on both Fe and glass–ceramic substrates. To promote the crystallization of the hexaferrites, the coatings were annealed at 800°–1000°C, and single‐phase coatings were obtained at 1000°C. The crystallization process was studied with X‐ray powder diffraction and with electron microscopy. The magnetic measurements of the coatings were carried out in a static field and at high frequencies. The magnetization of the coatings increased with the annealing temperature to above 50 emu/g for both compositions. The coercivity of BaFe12O19 increased with the annealing temperature to above 2400 Oe, whereas the coercivity of BaCoTiFe10O19 decreased from over 800 Oe, for the as‐deposited sample, to 400 Oe for the sample annealed at 1000°C. A minimum 90{\%} absorption was calculated for the BaFe12O19 coatings with thicknesses of 0.15–0.25 mm at around 47 GHz and for the 1–4‐mm‐thick coatings of BaCoTiFe10O19 at 3–9 GHz.",
author = "D. Lisjak and D. Makovec and S. Gyrgyek and Arto Hujanen and Pertti Lintunen and Tommi Varis and G. Bolelli and L. Lusvarghi and M. Drofenik",
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language = "English",
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Lisjak, D, Makovec, D, Gyrgyek, S, Hujanen, A, Lintunen, P, Varis, T, Bolelli, G, Lusvarghi, L & Drofenik, M 2009, 'The preparation of barium hexaferrite coatings using HVOF', Journal of the American Ceramic Society, vol. 92, no. 4, pp. 818-824. https://doi.org/10.1111/j.1551-2916.2009.03007.x

The preparation of barium hexaferrite coatings using HVOF. / Lisjak, D. (Corresponding Author); Makovec, D.; Gyrgyek, S.; Hujanen, Arto; Lintunen, Pertti; Varis, Tommi; Bolelli, G.; Lusvarghi, L.; Drofenik, M.

In: Journal of the American Ceramic Society, Vol. 92, No. 4, 2009, p. 818-824.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The preparation of barium hexaferrite coatings using HVOF

AU - Lisjak, D.

AU - Makovec, D.

AU - Gyrgyek, S.

AU - Hujanen, Arto

AU - Lintunen, Pertti

AU - Varis, Tommi

AU - Bolelli, G.

AU - Lusvarghi, L.

AU - Drofenik, M.

PY - 2009

Y1 - 2009

N2 - Thick coatings of barium hexaferrite with the compositions BaFe12O19 and BaCoTiFe10O19 were prepared using high‐velocity oxygen‐fuel (HVOF) spraying technology. Nanocrystalline precursors embedded in an amorphous matrix were obtained on both Fe and glass–ceramic substrates. To promote the crystallization of the hexaferrites, the coatings were annealed at 800°–1000°C, and single‐phase coatings were obtained at 1000°C. The crystallization process was studied with X‐ray powder diffraction and with electron microscopy. The magnetic measurements of the coatings were carried out in a static field and at high frequencies. The magnetization of the coatings increased with the annealing temperature to above 50 emu/g for both compositions. The coercivity of BaFe12O19 increased with the annealing temperature to above 2400 Oe, whereas the coercivity of BaCoTiFe10O19 decreased from over 800 Oe, for the as‐deposited sample, to 400 Oe for the sample annealed at 1000°C. A minimum 90% absorption was calculated for the BaFe12O19 coatings with thicknesses of 0.15–0.25 mm at around 47 GHz and for the 1–4‐mm‐thick coatings of BaCoTiFe10O19 at 3–9 GHz.

AB - Thick coatings of barium hexaferrite with the compositions BaFe12O19 and BaCoTiFe10O19 were prepared using high‐velocity oxygen‐fuel (HVOF) spraying technology. Nanocrystalline precursors embedded in an amorphous matrix were obtained on both Fe and glass–ceramic substrates. To promote the crystallization of the hexaferrites, the coatings were annealed at 800°–1000°C, and single‐phase coatings were obtained at 1000°C. The crystallization process was studied with X‐ray powder diffraction and with electron microscopy. The magnetic measurements of the coatings were carried out in a static field and at high frequencies. The magnetization of the coatings increased with the annealing temperature to above 50 emu/g for both compositions. The coercivity of BaFe12O19 increased with the annealing temperature to above 2400 Oe, whereas the coercivity of BaCoTiFe10O19 decreased from over 800 Oe, for the as‐deposited sample, to 400 Oe for the sample annealed at 1000°C. A minimum 90% absorption was calculated for the BaFe12O19 coatings with thicknesses of 0.15–0.25 mm at around 47 GHz and for the 1–4‐mm‐thick coatings of BaCoTiFe10O19 at 3–9 GHz.

U2 - 10.1111/j.1551-2916.2009.03007.x

DO - 10.1111/j.1551-2916.2009.03007.x

M3 - Article

VL - 92

SP - 818

EP - 824

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

SN - 0002-7820

IS - 4

ER -