Fe nanometer dot @ BN nanospherecompound and preparation method and application thereof

[0036] Example 1

[0037] will figure 1 The device shown is opened and tungsten is used as the cathode. The anode target material consumed is a block made of pure iron powder and boron powder (mass ratio 10:90), which is placed on a cooling water platform. Keep a distance of 30 mm between the cathode tungsten electrode and the anode target iron-boron powder block. During the whole process, the furnace body and anode placement platform are cooled by passing water. Place a liquid nitrogen cooling wall around the anode platform, and maintain a distance of 10 cm between the liquid nitrogen cooling wall and the anode target. After the entire working chamber is evacuated by the vacuum system, argon and nitrogen are introduced. The partial pressure of argon is 0.5 MPa and the partial pressure of nitrogen is 3.0 MPa. The DC power supply is connected and the voltage is 40 V. During the arc discharge process, the operating current and voltage are adjusted to be relatively stable. The Fe nanodot@BN nanosphere composite was obtained on the liquid nitrogen cooling wall. The microstructure of the nanocomposite was Fe nanodots embedded in BN nanospheres. The diameter of the BN nanospheres was about 150-300 nm, and the diameter of the Fe nanodots Is 1~3 nm, such as image 3 , Figure 4 Shown. The Fe nano-dot @BN nano-ball composites prepared were mixed with paraffin at a mass ratio of 50:50, and n-hexane was added as a solvent. The mixture was ultrasonically mixed until the n-hexane volatilized, and it was pressed into an inner diameter of 3.04mm with an abrasive tool. A coaxial ring sample with a diameter of 7mm and a thickness of 2mm is tested for electromagnetic performance in the frequency range of 2~18GHz, and the relationship between the electromagnetic absorption performance and frequency of the sample with a thickness of 1.6 mm is simulated using the obtained electromagnetic parameters, such as Figure 5 As shown, the maximum reflection loss value appears at 18.0 GHz, which is -27.91 dB.

[0038] Example 2

[0039] will figure 1 The device shown is opened and tungsten is used as the cathode. The anode target material consumed is a block of pure iron powder and boron powder (mass ratio 20:80), which is placed on a cooling water platform. Keep a distance of 2 mm between the cathode tungsten electrode and the anode target iron-boron powder block. During the whole process, the furnace body and anode placement platform are cooled by passing water. Place a liquid nitrogen cooling wall around the anode platform, and keep a distance of 5 cm between the liquid nitrogen cooling wall and the anode target. After the entire working chamber is evacuated by the vacuum system, argon and nitrogen are introduced. The partial pressure of argon is 0.01 MPa and the partial pressure of nitrogen is 0.1 MPa. The DC power supply is connected and the voltage is 10 V. During the arc discharge process, the operating current and voltage are adjusted to be relatively stable. The Fe nanodot@BN nanosphere composite was obtained on the liquid nitrogen cooling wall. The microstructure of the nanocomposite was Fe nanodots embedded in BN nanospheres. The diameter of the BN nanospheres was about 150-300 nm, and the diameter of the Fe nanodots It is 1~3 nm. The Fe nano-dot @BN nano-sphere composite prepared was mixed with paraffin at a mass ratio of 40:60, and n-hexane was added as a solvent. The mixture was ultrasonically mixed until the n-hexane was volatilized. Then, it was pressed into an inner diameter of 3.04mm with an abrasive tool. A coaxial ring specimen with a diameter of 7 mm and a thickness of 2 mm is tested for electromagnetic performance in the frequency range of 2 to 18 GHz. The electromagnetic parameters obtained are used to simulate the relationship between the electromagnetic absorption performance and frequency of the specimen with a thickness of 1.8 mm. Image 6 As shown, the maximum reflection loss value appears at 15.92 GHz, which is -22.4 dB.

[0040] Example 3

[0041] will figure 1 The shown device is opened and tungsten is used as the cathode. The anode target material consumed is a block of pure iron powder and boron powder (mass ratio 15:85), which is placed on a cooling water platform. Keep a distance of 10 mm between the cathode tungsten electrode and the anode target iron-boron powder block. During the whole process, the furnace body and anode placement platform are cooled by passing water. Place a liquid nitrogen cooling wall around the anode platform, and keep a distance of 7 cm between the liquid nitrogen cooling wall and the anode target. After the entire working chamber is evacuated by the vacuum system, argon and nitrogen are introduced. The partial pressure of argon is 0.1 MPa and the partial pressure of nitrogen is 1.0 MPa. The DC power supply is connected and the voltage is 20 V. During the arc discharge process, the operating current and voltage are adjusted to be relatively stable. The Fe nanodot@BN nanosphere composite was obtained on the liquid nitrogen cooling wall. The microstructure of the nanocomposite was Fe nanodots embedded in BN nanospheres. The diameter of the BN nanospheres was about 150-300 nm, and the diameter of the Fe nanodots It is 1~3 nm. The Fe nano-dot @BN nano-sphere composite prepared was mixed with paraffin at a mass ratio of 40:60, and n-hexane was added as a solvent. The mixture was ultrasonically mixed until the n-hexane was volatilized. Then, it was pressed into an inner diameter of 3.04mm with an abrasive tool. A coaxial ring specimen with a diameter of 7 mm and a thickness of 2 mm is tested for electromagnetic performance in the frequency range of 2 to 18 GHz. The electromagnetic parameters obtained are used to simulate the relationship between the electromagnetic absorption performance and frequency of the specimen with a thickness of 2.0 mm, such as Figure 7 As shown, the maximum reflection loss value appears at 14.24 GHz, which is -21.36 dB.