Nano-porous Ferrite Absorbing Agent In The Hydrothermal Synthesis

Spinel-type ferrites have been used widely in the engineering field because of theirs superior performance. Especially, they are characteristic of low price and perfect absorbability, so they can be an important absorbent in Radar Absorbing Materials. Spinel-type ferrites are characteristic of ferromagnetism and conductance, so that they can produce magnetic hysteresis loss and electricity loss .The problems of ferrites are heavy density and narrow absorption frequency band. The purpose of this paper is to synthesize nano-microporous ferrites. Comparision with normal materials, Nano-materials have special performance because of their special surface effect, volume effect, and quantum effect. A kind of proper template was found in order to synthesis new-type structure nano-microporous ferrites. Various preparation methods have been used to obtain spinel-type ferrites. In order to meet the requirement of nano-microporous ferrites, hydrothermal method was applied. By studying the effects of different precursors, p11 value, temperature and time, the optimum conditions were determined. According to the Scherr formula, the diameter of crystals was got. At the same time, the structure of crystals was studied by X-diffract and infrared spectra and the chemical composition was studied by ICP spectra and the morphologic of crystals was studied by TEM and the stabilization of crystals was studied by TG-DTA. At last, the absorbability was studied by mixing ferrites and EPO resin. nano-microporous ferrites are a new-type of absorbents. Because they can not only absorb electromagnetic wave but also deflect and scatter electromagnetic wave, their absorbability was improved. Moreover, the density of nano-microporous ferrites was reduced, so they are very easily to be applied.