Preparation method of barium ferrite-ferroferric oxide composite wave-absorbing material

Abstract

The invention discloses a preparation method of a barium ferrite-ferroferric oxide composite wave-absorbing material. The preparation method comprises the following steps: preparing a (001) direction-oriented BaFe12O19 flaky powder by virtue of a molten salt method first, and then enabling Fe3O4 to grow on the BaFe12O19 which is used as a matrix by adopting a hydrothermal method, thereby preparing the barium ferrite-ferroferric oxide two-phase composite wave-absorbing material. The preparation process provided by the invention is simple in operation and short in period, the diameter of the prepared flaky barium ferrite-ferroferric oxide is about 2[mu]m, the size is uniform, and the microwave absorptivity of the flaky barium ferrite-ferroferric oxide has certain improvement.

Description

technical field

[0001] The invention belongs to the field of material science, and relates to a preparation method of barium ferrite@ferric oxide composite wave-absorbing material. Background technique

[0002] With the increasing development of science and technology, electromagnetic waves have been widely used in many fields such as mobile communication, broadcasting, radar, electronic heating, and magnetic therapy. Although, electromagnetic waves carrying information have brought great convenience to people in the fields of radio communication, broadcasting, satellite TV, and industry. However, it is undeniable that while enjoying the unprecedented convenience brought by the electric power and electronic information industry to work and life, people are also inevitably hurt by various electromagnetic waves. At present, there are two main methods to effectively prevent and reduce electromagnetic radiation and electromagnetic leakage: relying on emission-type electromagnet...

Examples

Embodiment 1

[0032] Step 1: Accurately take a total of 20g of BaCO with an electronic balance 3 , Fe 2 o 3 and NaCl, and then mixed evenly by wet ball milling, wherein the ball milling speed is 500r / min, and the ball milling time is 15h. NaCl is a molten salt (the molten salt can also be Li 2 SO 4 or KCl), BaCO 3 with Fe 2 o 3 The mass ratio of the total mass to NaCl is 1:2, BaCO 3 with Fe 2 o 3 The amount according to the general chemical formula BaFe 12 o 19 The molar ratio in .

[0033] Step 2: Dry the mixture after ball milling and form a phase at 1000°C, and keep it warm for 4 hours to make the oxide fully react with molten salt.

[0034] Step 3: Place the product obtained after the reaction into deionized water for ultrasonic dispersion, wash, and dry to obtain BaFe 12 o 19 Powder precursor B 1 . The temperature of deionized water is 80°C, the ultrasonic time is 15min, washing is done 5 times, and the drying temperature is 80°C.

[0035] Step 4: BaFe 12 o 19 Powder...

Embodiment 2

[0051] Step 1: Accurately take a total of 20g of BaCO with an electronic balance 3 , Fe 2 o 3 and NaCl, and then mixed evenly by ball milling, wherein the rotating speed of the ball milling is 550r / min, and the ball milling time is 15h. NaCl as molten salt, BaCO 3 , and Fe 2 o 3 The mass ratio of the total mass to NaCl is 1:2, BaCO 3 with Fe 2 o 3 The amount according to the general chemical formula BaFe 12 o 19 The molar ratio in .

[0052] Step 2: Dry the ball-milled mixture and form a phase at 1200°C, and keep it warm for 4 hours so that the oxides can fully undergo molten salt reaction.

[0053] Step 3: Place the product obtained after the reaction into deionized water for ultrasonic dispersion, wash, and dry to obtain BaFe 12 o 19 Powder precursor B 1 . The temperature of deionized water is 100°C, the ultrasonic time is 20min, the washing is done 5 times, and the drying temperature is 90°C.

[0054] Step 4: BaFe 12 o 19 Powder precursor B 1 , Fe 2 o 3 ...

Embodiment 3

[0062] Step 1: Accurately take a total of 20g of BaCO with an electronic balance 3 , Fe 2 o 3 and NaCl, and then mixed evenly by ball milling, wherein the rotating speed of the ball milling is 500r / min, and the ball milling time is 18h. NaCl as molten salt, BaCO 3 , and Fe 2 o 3 The mass ratio of total mass to NaCl is 1:1, BaCO 3 with Fe 2 o 3 The amount according to the general chemical formula BaFe 12 o 19 The molar ratio in .

[0063] Step 2: After drying the ball-milled mixture, form a phase at 1200° C., and keep it warm for 3 hours so that the oxides can fully undergo molten salt reaction.

[0064] Step 3: Place the product obtained after the reaction into deionized water for ultrasonic dispersion, wash, and dry to obtain BaFe 12 o 19 Powder precursor B 1 . The temperature of the deionized water is 90°C, the ultrasonic time is 20min, the washing is done 5 times, and the drying temperature is 60°C.

[0065] Step 4: BaFe 12 o 19 Powder precursor B 1 , Fe ...

technical field

[0001] The invention belongs to the field of material science, and relates to a preparation method of barium ferrite@ferric oxide composite wave-absorbing material. Background technique

[0002] With the increasing development of science and technology, electromagnetic waves have been widely used in many fields such as mobile communication, broadcasting, radar, electronic heating, and magnetic therapy. Although, electromagnetic waves carrying information have brought great convenience to people in the fields of radio communication, broadcasting, satellite TV, and industry. However, it is undeniable that while enjoying the unprecedented convenience brought by the electric power and electronic information industry to work and life, people are also inevitably hurt by various electromagnetic waves. At present, there are two main methods to effectively prevent and reduce electromagnetic radiation and electromagnetic leakage: relying on emission-type electromagnet...

Examples

Embodiment 1

[0032] Step 1: Accurately take a total of 20g of BaCO with an electronic balance 3 , Fe 2 o 3 and NaCl, and then mixed evenly by wet ball milling, wherein the ball milling speed is 500r / min, and the ball milling time is 15h. NaCl is a molten salt (the molten salt can also be Li 2 SO 4 or KCl), BaCO 3 with Fe 2 o 3 The mass ratio of the total mass to NaCl is 1:2, BaCO 3 with Fe 2 o 3 The amount according to the general chemical formula BaFe 12 o 19 The molar ratio in .

[0033] Step 2: Dry the mixture after ball milling and form a phase at 1000°C, and keep it warm for 4 hours to make the oxide fully react with molten salt.

[0034] Step 3: Place the product obtained after the reaction into deionized water for ultrasonic dispersion, wash, and dry to obtain BaFe 12 o 19 Powder precursor B 1 . The temperature of deionized water is 80°C, the ultrasonic time is 15min, washing is done 5 times, and the drying temperature is 80°C.

[0035] Step 4: BaFe 12 o 19 Powder...

Embodiment 2

[0051] Step 1: Accurately take a total of 20g of BaCO with an electronic balance 3 , Fe 2 o 3 and NaCl, and then mixed evenly by ball milling, wherein the rotating speed of the ball milling is 550r / min, and the ball milling time is 15h. NaCl as molten salt, BaCO 3 , and Fe 2 o 3 The mass ratio of the total mass to NaCl is 1:2, BaCO 3 with Fe 2 o 3 The amount according to the general chemical formula BaFe 12 o 19 The molar ratio in .

[0052] Step 2: Dry the ball-milled mixture and form a phase at 1200°C, and keep it warm for 4 hours so that the oxides can fully undergo molten salt reaction.

[0053] Step 3: Place the product obtained after the reaction into deionized water for ultrasonic dispersion, wash, and dry to obtain BaFe 12 o 19 Powder precursor B 1 . The temperature of deionized water is 100°C, the ultrasonic time is 20min, the washing is done 5 times, and the drying temperature is 90°C.

[0054] Step 4: BaFe 12 o 19 Powder precursor B 1 , Fe 2 o 3 ...

Embodiment 3

[0062] Step 1: Accurately take a total of 20g of BaCO with an electronic balance 3 , Fe 2 o 3 and NaCl, and then mixed evenly by ball milling, wherein the rotating speed of the ball milling is 500r / min, and the ball milling time is 18h. NaCl as molten salt, BaCO 3 , and Fe 2 o 3 The mass ratio of total mass to NaCl is 1:1, BaCO 3 with Fe 2 o 3 The amount according to the general chemical formula BaFe 12 o 19 The molar ratio in .

[0063] Step 2: After drying the ball-milled mixture, form a phase at 1200° C., and keep it warm for 3 hours so that the oxides can fully undergo molten salt reaction.

[0064] Step 3: Place the product obtained after the reaction into deionized water for ultrasonic dispersion, wash, and dry to obtain BaFe 12 o 19 Powder precursor B 1 . The temperature of the deionized water is 90°C, the ultrasonic time is 20min, the washing is done 5 times, and the drying temperature is 60°C.

[0065] Step 4: BaFe 12 o 19 Powder precursor B 1 , Fe ...

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