Nano ferrite wave-absorbing material
A technology of nano-ferrite and wave-absorbing materials, which is applied in the direction of nanotechnology, nanotechnology, and the magnetism of inorganic materials, can solve the problems of narrow wave-absorbing frequency band, and achieve the effects of improving wave-absorbing performance, simple preparation process, and high purity
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Embodiment 1
[0017] Take x=1, namely n(MgCl 2 ·6H 2 O): n(BaCl 2 ): n(AlCl 3 ): n(FeCl 3 ·6H 2 O) =1:1:1:9.
[0018] 1) First add 5 grams of mesoporous foamed silica into 50 grams of chloroform, ultrasonically disperse for 4 hours, then add 0.09mol FeCl 3 ·6H 2 O, 0.01mol BaCl 2 , 0.01mol AlCl 3 and 0.01mol MgCl 2 ·6H 2 O, add ammonia solution with a mass fraction of 10% to adjust the pH of the solution to 8, stir for 2 hours, let stand for 1 hour, filter, wash with water and dry to obtain nanopowder.
[0019] 2) Carry out high-temperature calcination on the dried nano-powder: under the protection of nitrogen atmosphere, heat from room temperature to 270°C, the heating rate is 4°C / min, and maintain 270°C for half an hour; heat from 270°C to 550°C, The heating rate is 6°C / min, and maintain 550°C for 1 hour, heat from 550°C to 1000°C, the heating rate is 10°C / min, maintain 1000°C for 1 hour, and finally cool down with the furnace under the protection of nitrogen to prepare nano-ir...
Embodiment 2
[0021] Take x=0, namely n(MgCl 2 ·6H 2 O): n(BaCl 2 ): n(FeCl 3 ·6H 2 O) =1:1:10.
[0022] 1) First add 5 grams of mesoporous foamed silica to 50 grams of chloroform, ultrasonically disperse for 6 hours, and then add 0.1mol FeCl 3 ·6H 2 O, 0.01mol BaCl 2 and 0.01mol MgCl 2 ·6H 2 O, add ammonia solution with a mass fraction of 15% to adjust the pH of the solution to 10, stir for 5 hours, let stand for 3 hours, filter, wash with water and dry to obtain nanopowder.
[0023] 2) Carry out high-temperature calcination on the dried nano-powder: under the protection of nitrogen atmosphere, heat from room temperature to 270°C, the heating rate is 4°C / min, and maintain 270°C for half an hour; heat from 270°C to 550°C, The heating rate is 6°C / min, and maintain 550°C for 1 hour, heat from 550°C to 1000°C, the heating rate is 10°C / min, maintain 1000°C for 1 hour, and finally cool down with the furnace under the protection of nitrogen to prepare nano-iron Oxygen absorbing material...
Embodiment 3
[0025] Take x=0.5, namely n(MgCl 2 ·6H 2 O): n(BaCl 2 ): n(AlCl 3 ): n(FeCl 3 ·6H 2 O) =1:1:0.5:9.5.
[0026] 1) First add 5 grams of mesoporous foamed silica into 50 grams of chloroform, ultrasonically disperse for 5 hours, and then add 0.095mol FeCl 3 ·6H 2 O, 0.005mol AlCl 3 , 0.01mol BaCl 2 and 0.01mol MgCl 2 ·6H 2 O, adding a mass fraction of 15% ammonia solution to adjust the pH of the solution to 9, stirring for 3 hours, standing for 2 hours, filtering, washing and drying to obtain nanopowder.
[0027] 2) Carry out high-temperature calcination on the dried nano-powder: under the protection of nitrogen atmosphere, heat from room temperature to 270°C, the heating rate is 4°C / min, and maintain 270°C for half an hour; heat from 270°C to 550°C, The heating rate is 6°C / min, and maintain 550°C for 1 hour, heat from 550°C to 1000°C, the heating rate is 10°C / min, maintain 1000°C for 1 hour, and finally cool down with the furnace under the protection of nitrogen to pre...
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