CN113073178A - Preparation method of GHz-frequency-band high-wave-absorption-performance iron-based nanocrystalline alloy - Google Patents
Preparation method of GHz-frequency-band high-wave-absorption-performance iron-based nanocrystalline alloy Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 159
- 239000000956 alloy Substances 0.000 title claims abstract description 80
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 78
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 75
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000010521 absorption reaction Methods 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000000137 annealing Methods 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims description 31
- 238000000227 grinding Methods 0.000 claims description 30
- 238000000498 ball milling Methods 0.000 claims description 29
- 238000004321 preservation Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000002612 dispersion medium Substances 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- 125000003158 alcohol group Chemical group 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 229910001004 magnetic alloy Inorganic materials 0.000 abstract description 4
- 230000035699 permeability Effects 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 abstract description 2
- 239000002159 nanocrystal Substances 0.000 abstract description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 12
- 239000002245 particle Substances 0.000 description 10
- 239000012188 paraffin wax Substances 0.000 description 9
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000011358 absorbing material Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- B22—CASTING; POWDER METALLURGY
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/054—Nanosized particles
- B22F1/0551—Flake form nanoparticles
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/068—Flake-like particles
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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Abstract
本发明属于软磁合金材料领域，特别是涉及一种GHz频段高吸波性能铁基纳米晶合金的制备方法。该方法通过快速升温的方式对成分为Fe73.5Cu1Nb3Si13.5B9非晶薄带进行退火处理，使得纳米晶从非晶基质上析出；在快速退火处理的过程中，通过控制工艺参数，实现降低介电常数改善阻抗匹配，提高吸波性能的目的。在上述步骤的基础上再对得到的铁基纳米晶合金薄带片状化处理，进一步提高磁导率，确保在GHz频段具有较好的吸收效果。相较于现有的表面包覆方式，无需对使用的材料进行改性掺杂、整个制备过程简单方便、易操作。
The invention belongs to the field of soft magnetic alloy materials, in particular to a preparation method of an iron-based nanocrystalline alloy with high wave-absorbing performance in GHz frequency band. In the method, the amorphous thin ribbon with the composition Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 is annealed by means of rapid heating, so that nanocrystals are precipitated from the amorphous matrix; in the process of rapid annealing, the process parameters are controlled by , to achieve the purpose of reducing the dielectric constant, improving the impedance matching, and improving the wave absorbing performance. On the basis of the above-mentioned steps, the obtained iron-based nanocrystalline alloy thin ribbon is processed into flakes to further improve the magnetic permeability and ensure a good absorption effect in the GHz frequency band. Compared with the existing surface coating methods, there is no need to modify and dope the materials used, and the whole preparation process is simple, convenient and easy to operate.
Description
Technical Field
The invention belongs to the field of soft magnetic alloy materials, and particularly relates to a preparation method of an iron-based nanocrystalline alloy with a GHz frequency band and high wave absorption performance.
Background
With the development of electronic information technology, the operating frequency of electronic systems and telecommunication equipment is continuously increasing towards GHz and higher frequency bands, and the Electromagnetic Interference (EMI) generated thereby becomes an increasingly serious pollution problem, and will have greater and greater impact on human health and environment. Therefore, it is of great importance to find new and effective electromagnetic interference shielding materials, and magnetic wave-absorbing materials are widely concerned and applied in the aspect of anti-electromagnetic interference.
At present, the research on magnetic wave-absorbing materials mainly focuses on ferrite and alloy. Ferrite materials are the earliest, most and more mature class of magnetic materials, and conventional ferrite materials have several disadvantages: the temperature stability is poor; the Curie temperature Tc is lower, and the work is difficult at high temperature; the saturation magnetization Ms is low, and large magnetic conductivity is difficult to obtain in a GHz frequency band; in addition, the ferrite material has the defects of difficult processing and high density, so that the high-frequency application of the ferrite material is more limited. The magnetic alloy has the advantages of overcoming the limitations and showing good application potential in a high-frequency band, and the iron-based nanocrystalline alloy is one of the types. The iron-based nanocrystalline alloy has the characteristics of high saturation magnetic induction intensity, high magnetic conductivity, low coercive force and the like, but still belongs to a high-conductivity material, and the dielectric constant is far greater than the magnetic conductivity due to the excessively high conductivity, so that impedance mismatch is caused, and the wave-absorbing performance is deteriorated. Therefore, how to realize better impedance matching and improve the wave-absorbing performance becomes the difficult problem of the application of the iron-based nanocrystalline alloy in the anti-EMI frequency band of GHz.
In order to solve the problem of impedance mismatch of magnetic alloys, a surface coating method is usually adopted for iron-based nanocrystalline alloys in the prior art, and a layer of high-resistivity material is coated on the surface of the alloy. However, this cladding material is typically non-magnetic, such as SiO 2. Simply speaking, the particles are separated by coating a layer of nonmagnetic oxide, so that the dielectric polarization degree is greatly reduced, and the dielectric constant is reduced. The method solves the problem of impedance mismatch to a certain extent, but the impedance matching can be further improved; in addition, the thickness of the wave absorber is increased due to the non-magnetic coating layer, the magnetic permeability of the material is greatly reduced, and the absorption performance is further deteriorated.
Disclosure of Invention
The invention aims to provide a preparation method of an iron-based nanocrystalline alloy with a GHz frequency band and high wave absorption performance, so as to improve the impedance matching of the iron-based nanocrystalline alloy and improve the wave absorption performance.
The technical scheme provided by the invention is as follows: a preparation method of an iron-based nanocrystalline alloy with a GHz frequency band and high wave absorption performance comprises the following steps:
heating the tubular furnace at a heating rate of 20-50 ℃/s to rapidly heat the tubular furnace to a temperature of 540-600 ℃; then, carrying out constant temperature heat preservation treatment, and keeping the temperature of the tube furnace within the range of 540-600 ℃, wherein the duration time of the constant temperature heat preservation treatment is 30s-10 min; and finally, cooling the tube furnace to room temperature by water to obtain the iron-based nanocrystalline alloy thin strip.
And 2, putting the iron-based nanocrystalline alloy thin strip obtained in the step 1 into a planetary ball mill for flaking treatment to obtain the iron-based nanocrystalline alloy with GHz frequency band high wave absorption performance.
Further, the sheet-like processing process of the iron-based nanocrystalline alloy thin strip is as follows:
2.1, putting the used grinding balls and silicon dioxide into a ball milling tank for ball milling for 1-2 hours to remove impurities on the surfaces of the grinding balls;
step 2.2, washing the grinding balls and the ball milling tank with clean water or deionized water;
step 2.3, respectively weighing an iron-based nanocrystalline alloy thin strip and grinding balls according to the ball material mass ratio of 20: 1-25: 1, putting the iron-based nanocrystalline alloy thin strip and the grinding balls into a ball milling tank, adding a dispersion medium, setting the rotating speed at 200 r/min-250 r/min, and carrying out ball milling for 28-31 hours; the dispersion medium is alcohol, and the alcohol is added into the liquid surface of the ball milling tank to submerge the milling balls; the grinding ball adopts zirconium balls;
2.4, after ball milling is finished, taking out the powder, and then putting the powder into a vacuum drying oven for drying to obtain the iron-based nanocrystalline alloy with the GHz frequency band high wave absorption performance; in the drying process, the temperature is controlled to be 40-60 ℃.
Furthermore, in order to make the impedance matching and the wave absorbing performance reach the best at the same time, the technological parameters are optimized. Specifically, in the step 1, the amorphous ribbon is heated at a heating rate of 20 ℃/s, so that the temperature of the amorphous ribbon is rapidly raised to 600 ℃; and then carrying out constant temperature heat preservation treatment, so that the temperature of the tube furnace is maintained within 600 ℃, and the duration of the constant temperature heat preservation treatment is 30 s.
The invention provides a preparation method of an iron-based nanocrystalline alloy with GHz frequency band and high wave absorption performance, which is characterized in that the component of the iron-based nanocrystalline alloy is Fe by means of rapid heating73.5Cu1Nb3Si13.5B9And annealing the amorphous thin belt to separate out the nanocrystalline from the amorphous matrix, thereby ensuring that the magnetic permeability of the material is not changed. In the process of rapid annealing treatment, the number of generated nanocrystals is large and the size of the crystal grains is small by controlling the process parameters such as the heating rate, the constant temperature and the heat preservation time, so that the number of crystal boundaries can be greatly increased, the scattering of electrons is increased, the resistivity is increased, and the purposes of reducing the dielectric constant, improving the impedance matching and improving the wave absorption performance are achieved. The obtained iron-based nanocrystalline alloy thin strip is subjected to sheet-like treatment on the basis of the process, so that the wave absorbing capacity is further improved, and the good electromagnetic wave absorption effect in a GHz frequency band is ensured. Compared with the existing surface coating mode, the process method does not need to dope the used materials, has simple and easily-operated preparation process, and is suitable for large-scale production.
Drawings
FIG. 1 is a graph of the reflection loss for a sample that has not been prepared by the method of the present invention;
FIG. 2 is a graph of the impedance matching characteristics of a sample that has not been prepared by the method of the present invention;
FIG. 3 is a graph of the reflection loss of a sample prepared in example 1 of the present invention;
FIG. 4 is a graph showing the impedance matching characteristics of samples prepared in example 1 of the present invention;
FIG. 5 is a graph of the reflection loss of a sample prepared in example 2 of the present invention;
FIG. 6 is a graph showing the impedance matching characteristics of samples prepared in example 2 of the present invention;
FIG. 7 is a graph of the reflection loss of a sample prepared in example 3 of the present invention;
FIG. 8 is a graph showing the impedance matching characteristics of samples prepared in example 3 of the present invention.
Detailed Description
The present invention will be further described with reference to examples.
Example 1:
step 1.1, heating the amorphous thin strip at a heating rate of 20 ℃/s to rapidly heat the amorphous thin strip.
Step 1.2, carrying out constant-temperature heat preservation treatment when the temperature of the tubular furnace rises to 600 ℃, wherein the constant-temperature is 600 ℃, and the heat preservation time is 30 s;
and 1.3, cooling the temperature of the tubular furnace to room temperature by water to obtain the iron-based nanocrystalline alloy thin strip with the thickness of 25 microns.
Step 2: and (3) putting the iron-based nanocrystalline alloy thin strip obtained in the step (1) into a planetary ball mill for flaking treatment to obtain the iron-based nanocrystalline alloy with GHz frequency band high wave absorption performance. The flaking treatment process is as follows:
2.1, putting the used grinding balls and silicon dioxide into a ball milling tank for ball milling for 2 hours, and removing impurities on the surfaces of the grinding balls;
step 2.2, washing the grinding balls and the ball milling tank with clean water or deionized water;
and 2.3, respectively weighing the iron-based nanocrystalline alloy thin strip and the zirconia grinding balls according to the ball material mass ratio of 25:1, putting the iron-based nanocrystalline alloy thin strip and the zirconia grinding balls into a ball milling tank, adding alcohol as a dispersion medium, submerging the grinding balls on the alcohol liquid surface, setting the rotating speed at 200r/min, and performing ball milling for 30 hours.
And 2.4, after the ball milling is finished, taking out the powder, and then putting the powder into a vacuum drying oven for drying to obtain the iron-based nanocrystalline alloy with the GHz frequency band high wave absorption performance. In order to avoid oxidation of the iron-based nanocrystalline alloy during the drying process, the drying temperature in this embodiment is 40 ℃.
To better illustrate the advantages of the method provided by the invention, the iron-based nanocrystalline alloy powder obtained in example 1 is mixed with paraffin according to the mass ratio of 3:1, and after ring pressing, the electromagnetic parameters of the alloy powder are tested, and the wave-absorbing performance is calculated. The method specifically comprises the following steps:
And 2, cutting the solidified mixture into small powder particles, putting the powder particles into a mold, keeping the pressure of 10MPa for 10s, and pressing the powder particles into a ring, wherein the inner diameter, the outer diameter and the thickness of the ring are respectively 3mm, 7mm and 3 mm.
And 3, testing the electromagnetic parameters between 0.5 and 18GHz by using an Agilent N5320A vector network analyzer.
Therefore, the formula of the invention is Fe73.5Cu1Nb3Si13.5B9The amorphous ribbon prepared by the preparation method realizes better impedance matching and wave-absorbing performance.
FIG. 1 is a graph of the reflection loss of an iron-based nanocrystalline alloy that has not been prepared by the method of the present invention; fig. 3 is a reflection loss curve diagram of the iron-based nanocrystalline alloy obtained in example 1 of the present invention. FIG. 2 is a graph of the impedance matching characteristics of an iron-based nanocrystalline alloy that has not been prepared by the method of the present invention; fig. 4 is a graph showing the impedance matching characteristics of the iron-based nanocrystalline alloy obtained in example 1 of the present invention.
Comparing fig. 1 and 3, and fig. 2 and 4, it can be known that the normalized impedance Z of the iron-based nanocrystalline alloy processed by the preparation method of the present invention is changed from 0.16 to 0.995, the more infinite the value of Z is close to 1, the better the impedance matching effect is, the highest reflection loss is increased from-11.23 dB to-51.07 dB, and the absorption bandwidth (with-10 dB as a reference point) is increased from 0.35GHz to 2.275GHz, so that the wave-absorbing performance is greatly improved.
Example 2
step 1.1, heating the amorphous thin strip at a heating rate of 20 ℃/s to rapidly heat the amorphous thin strip.
Step 1.2, carrying out constant-temperature heat preservation treatment when the temperature of the tubular furnace rises to 600 ℃, wherein the constant-temperature is 600 ℃, and the heat preservation time is 3 min;
and 1.3, cooling the temperature of the tubular furnace to room temperature by water to obtain the iron-based nanocrystalline alloy thin strip with the thickness of 25 mu m.
And 2, putting the iron-based nanocrystalline alloy thin strip obtained in the step 1 into a planetary ball mill for flaking treatment to obtain the iron-based nanocrystalline alloy with GHz frequency band high wave absorption performance. The flaking treatment process comprises the following steps:
2.1, putting the used grinding balls and silicon dioxide into a ball milling tank for ball milling for 2 hours, and removing impurities on the surfaces of the grinding balls;
step 2.2, washing the grinding balls and the ball milling tank with clean water or deionized water;
and 2.3, respectively weighing the iron-based nanocrystalline alloy thin strip and the zirconia grinding balls according to the ball material mass ratio of 25:1, putting the iron-based nanocrystalline alloy thin strip and the zirconia grinding balls into a ball milling tank, adding alcohol as a dispersion medium, submerging the grinding balls on the alcohol liquid surface, setting the rotating speed at 200r/min, and performing ball milling for 30 hours.
And 2.4, after the ball milling is finished, taking out the powder, and then putting the powder into a vacuum drying oven for drying to obtain the iron-based nanocrystalline alloy with the GHz frequency band high wave absorption performance. In order to avoid oxidation of the iron-based nanocrystalline alloy during the drying process, the drying temperature in this embodiment is 60 ℃.
To better illustrate the advantages of the method provided by the invention, the iron-based nanocrystalline alloy powder obtained in example 2 is mixed with paraffin according to the mass ratio of 3:1, and the mixture is pressed into a ring and then the electromagnetic parameters of the ring are tested, and the wave-absorbing performance is calculated. The specific process is as follows:
And 2, cutting the solidified mixture into small powder particles, putting the powder particles into a mold, keeping the pressure of 10MPa for 10s, and pressing the powder particles into a ring, wherein the inner diameter, the outer diameter and the thickness of the ring are respectively 3mm, 7mm and 3 mm.
And 3, testing the electromagnetic parameters between 0.5 and 18GHz by using an Agilent N5320A vector network analyzer.
FIG. 5 is a reflection loss curve of an iron-based nanocrystalline alloy prepared according to example 2 of the present invention; fig. 6 is an impedance matching characteristic diagram of the iron-based nanocrystalline alloy prepared in example 2 of the present invention. Comparing fig. 1 and 5, fig. 2 and fig. 6, it can be known that the normalized impedance Z of the iron-based nanocrystalline alloy processed by the preparation method is changed from 0.16 to 0.995, the more infinite the value of Z is close to 1, the better the impedance matching effect is, the highest reflection loss is increased from-11.23 dB to-48.22 dB, and the absorption bandwidth (with-10 dB as a reference point) is increased from 0.35GHz to 1.575GHz, so that the wave-absorbing performance is greatly improved.
Example 3
step 1.1, heating the amorphous thin strip at a heating rate of 20 ℃/s to rapidly heat the amorphous thin strip.
Step 1.2, carrying out constant temperature heat preservation treatment when the temperature of the tube furnace rises to 540 ℃, wherein the constant temperature is 540 ℃, and the heat preservation time is 8 min;
and 1.3, cooling the temperature of the tubular furnace to room temperature by water to obtain the iron-based nanocrystalline alloy thin strip with the thickness of 25 mu m.
And 2, putting the iron-based nanocrystalline alloy thin strip obtained in the step 1 into a planetary ball mill for flaking treatment to obtain the iron-based nanocrystalline alloy with GHz frequency band high wave absorption performance. The flaking treatment process comprises the following steps: :
2.1, putting the used grinding balls and silicon dioxide into a ball milling tank for ball milling for 2 hours, and removing impurities on the surfaces of the grinding balls;
step 2.2, washing the grinding balls and the ball milling tank with clean water or deionized water;
and 2.3, weighing the iron-based nanocrystalline alloy thin strip and the zirconia grinding balls respectively according to the ball-to-material ratio of 20:1, putting the iron-based nanocrystalline alloy thin strip and the zirconia grinding balls into a ball milling tank, adding alcohol as a dispersion medium, submerging the grinding balls on the alcohol liquid surface, setting the rotating speed at 200r/min, and performing ball milling for 30 hours.
And 2.4, after the ball milling is finished, taking out the powder, and then putting the powder into a vacuum drying oven for drying to obtain the iron-based nanocrystalline alloy with the GHz frequency band high wave absorption performance. In order to avoid oxidation of the iron-based nanocrystalline alloy during the drying process, the drying temperature in this embodiment is 60 ℃.
To better illustrate the advantages of the method provided by the invention, the iron-based nanocrystalline alloy powder obtained in example 3 is mixed with paraffin according to the mass ratio of 3:1, and the mixture is pressed into a ring and then the electromagnetic parameters of the ring are tested, and the wave-absorbing performance is calculated. The specific process is as follows:
And 2, cutting the solidified mixture into small powder particles, putting the powder particles into a mold, keeping the pressure of 10MPa for 10s, and pressing the powder particles into a ring, wherein the inner diameter, the outer diameter and the thickness of the ring are respectively 3mm, 7mm and 3 mm.
And 3, testing the electromagnetic parameters between 0.5 and 18GHz by using an Agilent N5320A vector network analyzer.
FIG. 7 is a reflection loss curve of an iron-based nanocrystalline alloy prepared according to example 3 of the present invention; fig. 8 is an impedance matching characteristic diagram of the iron-based nanocrystalline alloy prepared in example 3 of the present invention. Comparing fig. 1 and 7, fig. 2 and 8, it can be known that the normalized impedance Z of the iron-based nanocrystalline alloy processed by the preparation method is changed from 0.16 to 0.996, the more infinite the value of Z is close to 1, the better the impedance matching effect is, the highest reflection loss is increased from-11.23 dB to-50.52 dB, and the absorption bandwidth (taking-10 dB as a reference point) is increased from 0.35GHz to 1.138GHz, so that the wave-absorbing performance is greatly improved.
In summary, the invention provides a preparation method of an iron-based nanocrystalline alloy with GHz frequency band and high wave absorption performance, and the method adopts a formula of Fe73.5Cu1Nb3Si13.5B9The amorphous thin strip is subjected to rapid annealing treatment, so that impedance matching is improved on the basis of keeping excellent magnetic performance, and the wave absorbing performance is greatly improved. Compared with a surface coating treatment mode, the process method does not use the premise of sacrificing magnetic conductivity, is simple and easy to operate, and is suitable for large-scale production.
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
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