Preparation of barium ferrite powder and wave absorption property of coated fabric thereof
Barium ferrite(BaFe12O19)magnetic powder was synthesized by microwave hydrothermal method.BaFe12O19 and polyvinylidene fluoride(PVDF)powder were mixed by mechanical mixing method and were prepared into BaFe12O19/PVDF com-posite absorber by casting method using waterborne polyurethane as a binder,which was coated on nylon fabric to prepare absorb-ing fabric.The crystal structure,chemical structure and magnetic properties of BaFe12O19 powder,as well as the mechanical properties,hydrophobicity and absorption properties of absorbing fabrics,were studied.The results showed that the synthesized BaFe12O19 powder exhibited the phase composition and crystal structure consistent with those of the known standard BaFe12O19 and was of high purity and good magnetic properties;the breaking strength and elongation at break of the absorbing fabric showed an upward trend as the coating thickness increased,the mechanical properties of the absorbing fabric were optimized,with a break-ing strength of 1 734.32 N and an elongation at break of 57.36%,when the coating thickness was 3.5 mm;the water contact an-gle of the absorbing fabric increased,but lower than 90°,as the amount of PVDF increased;the addition of PVDF effectively im-proved the absorption property of the absorbing fabrics,the absorbing fabric had the widest effective absorption bandwidth of 2.48 GHz,indicating an optimal absorption property,when the mass ratio of BaFe12O19/PVDF was 1.0:0.6 and the coating thick-ness was 2.5 mm.
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