Preparation Of Composite W-type Hexaferrite Nanoparticle And Investigation Of Its Microwave Absorptive Behavior

W-type barium hexaferrite nanoparticle has been prepared by sol-gel and chemical coprecipitation method in this paper. lts grain size andphase structure depending on preparation procedure were aIso investigated.Firstly, microwave absorptive lnechanism for w-type hexaferrite wasgeneralized as domain resonance and natural resonance. Based on the theoryof microwave transmission in the media,matching conditiQns Qf absorptionfilms for the capture and absorption of microwave signal were;derived.Secondly, the popular solution method to prepare uItrafine particle wasintroduced. According to BaNi,.,Zn,..-.Co.Fel6-,'+Al,'+O stoichiometriccomposition, Composite and single pl1ase w-type hexaferrite nanoparticleabsorption wave material were prepared.Thirdly,absorbing microwave capacity dependence of preparationmethod' sinter condition' Co col1tent and doped carbon fiber werethoroughly studied.Experiment contrast show, the prepared w-type planar hexaferritemicrowave absorptive material appears two absorptive peaks in thefrequency range of (7~l2GHz),its average attel1uation exceed 7dB,themaximum absorptive attenuation is 24dB,coat matching thickness isl.21mm,especialy its curie temperature is 457C.So, It can meet practicaldemands in military camouflage field.