Author/Authors :
Lisjak، نويسنده , , Darja and Bobzin، نويسنده , , Kirsten and Richardt، نويسنده , , Katharina and Bégard، نويسنده , , Marion and Bolelli، نويسنده , , Giovanni and Lusvarghi، نويسنده , , Luca and Hujanen، نويسنده , , Arto and Lintunen، نويسنده , , Pertti and Pasquale، نويسنده , , Massimo and Olivetti، نويسنده , , Elena and Drofenik، نويسنده , , Miha and Schlنfer، نويسنده , , Thomas، نويسنده ,
Abstract :
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 during annealing 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 suitable for absorbers at microwave and mm-wave frequencies, depending on the coating phaseʹs composition, the crystallinity and the thicknesses.
Keywords :
ferrites , Thermal spraying , solid-state reaction , dielectric properties , Magnetic properties
