a hofeb/fe 3 o 4 Composite wave-absorbing material and its preparation method

A composite wave absorbing material, ho5fe17b17 technology, applied in the direction of inorganic material magnetism, boron/boride, iron oxide/iron hydroxide, etc. Strong oxidizing ability, simple preparation process, and the effect of absorbing frequency bandwidth

Active Publication Date: 2021-01-12
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

HoFeB is difficult to prepare, and with Fe 3 o 4 It is very easy to be uneven when mixing materials, and the loss of ball milling is large

Method used

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  • a hofeb/fe <sub>3</sub> o <sub>4</sub> Composite wave-absorbing material and its preparation method
  • a hofeb/fe <sub>3</sub> o <sub>4</sub> Composite wave-absorbing material and its preparation method
  • a hofeb/fe <sub>3</sub> o <sub>4</sub> Composite wave-absorbing material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] like figure 1 As shown, a HoFeB / Fe proposed by the present invention 3 o 4 The preparation method of composite magnetic wave-absorbing material comprises the following steps:

[0025] Step 1. Ho, Fe, and B elemental substances with a purity ≥ 99.95% are pressed by Ho 5 Fe 17 B 17 Stoichiometric (atomic percent) ingredients of molecular formula;

[0026] Step 2. Smelting in a standard electric arc furnace under the protection of argon, in order to ensure that the composition of the alloy is uniform, turn over and smelt repeatedly for 3 to 4 times;

[0027] Step 3. Take out the smelted ingot and seal it in a vacuum quartz tube, heat it at 800°C for 120 hours, and then quench it with ice water;

[0028] Step 4. The cooled alloy ingot obtained in step 3 is broken into coarse powder with particle size less than 0.5mm, and sieved under 300 mesh sieve;

[0029] Step 5. The alloy ingot coarse powder obtained in step 4 is placed on a high-energy ball mill for 2 hours unde...

Embodiment 2

[0034] like figure 1 As shown, a HoFeB / Fe proposed by the present invention 3 o 4 The preparation method of composite magnetic wave-absorbing material comprises the following steps:

[0035] Step 1. Ho, Fe, and B elements with a purity of ≥99.95%, press Ho 5 Fe 17 B 17 Stoichiometric (atomic percent) ingredients of molecular formula;

[0036] Step 2. Smelting in a standard electric arc furnace under the protection of argon, in order to ensure that the composition of the alloy is uniform, turn over and smelt repeatedly for 3 to 4 times;

[0037] Step 3. Take out the smelted ingot and seal it in a vacuum quartz tube, heat it at 800°C for 120 hours, and then quench it with ice water;

[0038] Step 4. The cooled alloy ingot obtained in step 3 is broken into coarse powder with particle size less than 0.5mm, and sieved under 300 mesh sieve;

[0039] Step 5. The alloy ingot coarse powder obtained in step 4 is placed on a high-energy ball mill for 4 hours under the protection o...

Embodiment 3

[0044] like figure 1 As shown, a HoFeB / Fe proposed by the present invention 3 o 4 The preparation method of composite magnetic wave-absorbing material comprises the following steps:

[0045] Step 1. Ho, Fe, and B elements with a purity of ≥99.95%, press Ho 5 Fe 17 B 17 Stoichiometric (atomic percent) ingredients of molecular formula;

[0046] Step 2. Smelting in a standard electric arc furnace under the protection of argon, in order to ensure that the composition of the alloy is uniform, turn over and smelt repeatedly for 3 to 4 times;

[0047] Step 3. Take out the smelted ingot and seal it in a vacuum quartz tube, heat it at 800°C for 120 hours, and then quench it with ice water;

[0048] Step 4. The cooled alloy ingot obtained in step 3 is broken into coarse powder with particle size less than 0.5mm, and sieved under 300 mesh sieve;

[0049] Step 5. The alloy ingot coarse powder obtained in step 4 is placed on a high-energy ball mill for 6 hours under the protection o...

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Abstract

The invention provides a HoFeB / Fe 3 o 4 The composite wave-absorbing material and its preparation method are applicable to the field of wave-absorbing materials, and the preparation method comprises, respectively using Ho, Fe and B with a purity ≥ 99.95% as raw materials, repeatedly melting them into an ingot with uniform composition in an argon atmosphere, Vacuumize and seal in quartz glass for homogenization annealing at 800°C, then quench with ice-water mixture, and then perform mechanical crushing and high-energy ball milling. The powder after high-energy ball milling was mixed with ferroferric oxide in an agate mortar according to the relative molecular mass percentage to obtain HoFeB / Fe 3 o 4 composite material. The composite wave-absorbing material of the invention has good microwave absorption effect in the microwave frequency range of 2-18 GHz, wide absorption frequency point, simple preparation process, strong oxidation resistance and the like. It can be applied to the preparation of microwave absorbing products that require wide absorbing frequency band, good absorbing performance and strong oxidation resistance.

Description

technical field [0001] The invention belongs to the field of microwave materials, specifically magnetic microwave absorbing materials, more specifically HoFeB alloy and Fe 3 o 4 Composite magnetic wave-absorbing material and its preparation method. Background technique [0002] Electromagnetic wave absorbing material (referred to as wave absorbing material) refers to a class of materials that can absorb and attenuate incident electromagnetic waves and convert their electromagnetic energy into heat or other forms of energy to dissipate or make electromagnetic waves disappear due to interference effects. . After entering the electrical age, electronic equipment and mobile communication have achieved great development. While bringing convenience to humans, it also faces the problem of electromagnetic wave radiation. Electromagnetic wave radiation has become the "fifth largest pollution", which not only affects human health, but also interferes with the normal operation of e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/04C01G49/08H01F1/36
CPCC01B35/04C01G49/08C01P2004/80H01F1/36
Inventor 姚青荣饶光辉周怀营王江邓健秋徐雍强
Owner GUILIN UNIV OF ELECTRONIC TECH
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