Patent ID: 8901205

Claim:
A method for making an electromagnetic wave-absorbing composite, the method including the steps of: mixing barium nitride, iron nitride and glycine with one another and with deionized water and stirring so that the barium nitride, iron nitride and glycine are dissolved in the de-ionized water; introducing ammonium hydroxide into the barium nitride-iron nitride-glycine solution to adjust the pH of the solution; subjecting the barium nitride-iron nitride-glycine solution to a bath so as to form brown collosol; baking the brown collosol so that it is turned into gel; heating and calcining the gel to obtain barium ferrite (BaFe 12 O 19 ) powder; dissolving tetrabutyl titanate in isopropyl alcohol and stirring; dissolving barium acetate in the tetrabutyl titanate-isopropyl alcohol solution; introducing glacial acetic acid into the barium acetate-tetrabutyl titanate-isopropyl alcohol solution to adjust the pH of the solution; subjecting the solution to a sol-gel reaction; drying and calcining obtained gel to obtain barium titanate (BaTiO 3 ) powder; mixing the barium ferrite with the barium titanate and dissolving the mixture in water; separately mixing dodecylbenzenesulfonic acid (DBSA) and deionized water and stirring; then adding aniline to the DBSA and deionized water and emulsifying, thus providing an emulsifying agent; adding the barium ferrite +barium titanate solution to the pre-mixed DBSA-aniline emulsifying agent and stirring by ultrasonic waves; adding ammonium persulfate (APS) into de-ionized water and stirring; adding the APS solution to the barium ferrite + barium titanate and emulsifying agent so that polymerization occurs; after the polymerization, adding acetone for dividing the mixture made in the forgoing step into an upper tier and a lower tier; filtering and drying deposits in the lower tier, thus providing a (Ba Ferrite+BaTiO 3 )/polyaniline composite.