Microwave-absorbing layers, consisting of Co, Ti-substituted Ba-hexaferrite (BaCoTiFe10O19), were prepared by the APS and HVOF processes, using BaCoTiFe10O19 powders manufactured by solid-state reaction at 1100 Â°C followed by spray-drying. The SEM+EDX, XRD and micro-Raman analyses indicated that the melting and quenching of the agglomerates during spraying hindered the crystallisation of the hexaferrite structure, resulting in coatings with poor magnetic properties. Adjusted processing conditions, allowing the retention of a controlled amount of unmelted material, enabled the deposition of a coating having magnetic properties close to bulk BaCoTiFe10O19, suitable for electromagnetic wave absorption. Copyright Â© 2009 ASM InternationalÂ® All rights reserved.
Thermally-sprayed BaCoTiFe10O19 layers as microwave absorbers / Bolelli, G.; Lusvarghi, L.; Lisjak, D.; Hujanen, A.; Lintunen, P.; Kanerva, U.; Varis, T.; Bégard, M.; Richardt, K.; Schläfer, T.; Bobzin, K.; Pasquale, M.. - (2009), pp. 628-633. (Intervento presentato al convegno Expanding Thermal Spray Performance to New Markets and Applications - 2009 International Thermal Spray Conference, ITSC 2009 tenutosi a Las Vegas, NV, usa nel 2009) [10.1361/cp2009itsc0628].