In this research, Ba-hexaferrite coatings for electromagnetic wave absorption applications were deposited bythermal spraying. A suitable powder feedstock was manufactured by blending a BaCO3+Fe2O3 mixture,which was then agglomerated by spray-drying. The agglomerates were processed by air plasma spraying(APS) without any further treatment or were heat-treated and reactively-sintered to stoichiometric Bahexaferriteprior to spraying. As-sprayed coatings were analyzed by Raman spectroscopy and X-raydiffraction (XRD). Whereas the deposition of untreated agglomerates did not result in adequate amounts ofcrystalline Ba-hexaferrite in the coatings, the APS processing of reactively-sintered agglomerates led to ahigh content of Ba-hexaferrite and similar magnetic properties to those of Ba-hexaferrite bulk materials.
Development of Ba-hexaferrite coatings for electromagnetic wave absorption applications / K., Bobzin; T., Schlaefer; M., Bégard; M., Bruehl; Bolelli, Giovanni; Lusvarghi, Luca; D., Lisjak; A., Hujanen; P., Lintunen; U., Kanerva; T., Varis; M., Pasquale. - In: SURFACE & COATINGS TECHNOLOGY. - ISSN 0257-8972. - STAMPA. - 205:4(2010), pp. 1015-1020. [10.1016/j.surfcoat.2010.03.060]
Development of Ba-hexaferrite coatings for electromagnetic wave absorption applications
BOLELLI, Giovanni;LUSVARGHI, Luca;
2010
Abstract
In this research, Ba-hexaferrite coatings for electromagnetic wave absorption applications were deposited bythermal spraying. A suitable powder feedstock was manufactured by blending a BaCO3+Fe2O3 mixture,which was then agglomerated by spray-drying. The agglomerates were processed by air plasma spraying(APS) without any further treatment or were heat-treated and reactively-sintered to stoichiometric Bahexaferriteprior to spraying. As-sprayed coatings were analyzed by Raman spectroscopy and X-raydiffraction (XRD). Whereas the deposition of untreated agglomerates did not result in adequate amounts ofcrystalline Ba-hexaferrite in the coatings, the APS processing of reactively-sintered agglomerates led to ahigh content of Ba-hexaferrite and similar magnetic properties to those of Ba-hexaferrite bulk materials.
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