HoFeB/Fe3O4 wave-absorbing composite material and preparation method thereof

A composite wave-absorbing material, ho5fe17b17 technology, applied in the direction of inorganic material magnetism, boron/boride, iron oxide/iron hydroxide, etc., can solve the problems of easy uneven mixing, difficult preparation, large ball milling loss, etc., to achieve the preparation The process is simple, the anti-oxidation ability is strong, and the effect of absorption frequency band is wide

Active Publication Date: 2019-08-27
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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  • HoFeB/Fe3O4 wave-absorbing composite material and preparation method thereof
  • HoFeB/Fe3O4 wave-absorbing composite material and preparation method thereof
  • HoFeB/Fe3O4 wave-absorbing composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as 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 u...

Embodiment 2

[0034] Such as 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 protectio...

Embodiment 3

[0044] Such as 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 protectio...

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Abstract

The invention provides a HoFeB/Fe3O4 wave-absorbing composite material and a preparation method thereof. The HoFeB/Fe3O4 wave-absorbing composite material is suitable for the field of microwave absorbing materials. The preparation method includes the following steps that Ho, Fe and B with the purity equal to or more than 99.95% serve as raw materials respectively and are repeatedly molten into ingots with uniform compositions in an argon atmosphere, vacuumizing is conducted, and the ingots are sealed in quartz glass for homogeneous annealing at 800 DEG C, then quenched with an ice-water mixture, mechanically crushed into powder and ball-milled into powder by using high energy; the powder obtained after high-energy ball milling and ferroferric oxide are placed in an agate mortar for grinding and mixing according to the relative molecular mass ratio, and the HoFeB/Fe3O4 composite material is obtained. The wave-absorbing composite material has a very good microwave absorbing effect in themicrowave frequency band of 2-18 GHz and a wide wave-absorbing bandwidth, has the advantages of a simple preparation process, high oxidation resistance and the like, and can be suitable for preparation of microwave absorption products which require wide wave-absorbing bandwidth, good wave-absorbing performance and high 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 Applications(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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