Thick coatings of barium hexaferrite with the compositions BaFe12O19 and BaCoTiFe10O19 were prepared using atmospheric plasma spraying (APS)technology. The coatings were prepared from pre-reacted powders of the desired composition. The as-deposited coatings were poorly crystallized,but their crystallinity was improved with a subsequent annealing. The crystallization mechanism of the sprayed hexaferrites was studied duringannealing up to 1300 ◦C, using X-ray powder diffraction combined with thermal analysis and with electron microscopy including microanalysis.Single-phase coatings were obtained after annealing treatments at 1100–1300°C. Their magnetic properties showed that they would be suitablefor absorbers at microwave and mm-wave frequencies, depending on the coating phase’s composition, the crystallinity and the thicknesses.
Preparation of barium hexaferrite coatings using atmospheric plasma spraying / Darja, Lisjak; Kirsten, Bobzin; Katharina, Richardt; Marion, Bégard; Bolelli, Giovanni; Lusvarghi, Luca; Arto, Hujanen; Pertti, Lintunen; Massimo, Pasquale; Elena, Olivetti; Miha, Drofenik; Thomas, Schläfer. - In: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY. - ISSN 0955-2219. - STAMPA. - 29:11(2009), pp. 2333-2341. [10.1016/j.jeurceramsoc.2009.01.028]