CN109825687A - Using the electro-magnetic wave absorption structure preparation method of iron based nano crystal absorbent - Google Patents
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Abstract
Using the rubber-ferrite structure preparation method of iron based nano crystal absorbent, it is related to electromagnetic wave absorbent material technology.The present invention includes the following steps: 1) to be heat-treated Fe base nanometer crystal absorbing material, heat treatment temperature T1, obtain the first Fe base nanometer crystal absorbing material；2) Fe base nanometer crystal absorbing material, heat treatment temperature T are heat-treated2, obtain the 2nd Fe base nanometer crystal absorbing material；3) the first Fe base nanometer crystal absorbing material is set in the upper surface of metal substrate, forms first and inhales wave layer；4) wave layer upper surface is inhaled first and the 2nd Fe base nanometer crystal absorbing material is set, form second and inhale wave layer；The Fe base nanometer crystal absorbing material ingredient is Fe(70~90)‑Si(0~15)‑(X)(0~13)‑(Me)(0~5)‑Cu(0~2), subscript coefficient expression atomic percent, X representative element B or C or P；Me represents Zr or Hf or Ti or Al or Nb；There can be better absorbent properties in 1-10GHz frequency range internal ratio single-layer absorption structure using the absorbing material of the technology of the present invention.
Description
Technical field
The present invention relates to electromagnetic wave absorbent material technologies.
Background technique
Due to the fierce confrontation that the rigors and military field Electromagnetic Control of electronic device electromagnetic radiation are weighed, electromagnetism
Wave absorbing material is in military field (such as stealth technology) and civil field (such as electromagnetism interference, near-field communication, electromagnetic compatibility)
Field has a wide range of applications.With the raising of working frequency of electronic component, there is an urgent need to develop a series of working frequency range to exist
The magnetoelectric composites of low cost, high-temperature stability, high-selenium corn efficiency within the scope of 1GHz-10GHz.Conventional ferrite is multiple
Condensation material is not able to satisfy technical requirements gradually since density is big, applies thickness, the disadvantage that temperature stability is poor, working frequency range is low.
Iron (Fe) base Sol-Gel alloy is a kind of functional material with high saturation and magnetic intensity, high initial magnetoconductivity, it is low
(such as 50Hz/60Hz) or it is usually used in magnetic powder core material between 1KHz-1MHz under frequency.This kind of application requirement it have it is lower
Magnetic loss.Since strong eddy-current loss causes the magnetic conductivity of this kind of material to decline to a great extent under higher frequency range, loss is sharply
Increase so that they are no longer appropriate for being used as magnetic powder core material.In recent years, it has been found that (such as Fe-Si is closed the soft magnetic materials of metal mold
Gold, Fe-Ni, Fe-Si-Al, pure iron), by being prepared into flaky powder, using stronger shape anisotropy, this kind of material
Material can be used for electromagnetic wave absorbent material more than 1GHz frequency range, and wherein physical mechanism is main shape anisotropy place pair
The natural resonance phenomenon answered can substantially absorb incident electromagnetic wave energy.Such as Chinese patent 201110447119.X and
Fe-Si-Al flaky powder disclosed in 201210094367.5 passes through the control of surface treatment and geometric dimension to powder
System, can be improved the electromagnetic wave absorption performance of absorbent.
According to EM theory, radio-radar absorber is wanted to play a role, it is desirable that the dielectric constant and magnetic conductivity of absorbent
Size will approach as far as possible.However, since the metallic character of magnetically soft alloy causes this kind of material in 1GHz or more usually with high
Dielectric constant (> 100) and lesser magnetic conductivity (2~3), the two numerical value seriously mismatch, lead to their electro-magnetic wave absorption
Performance is undesirable.For this purpose, people improve the resistivity of powder by carrying out cladding processing to superalloy sheet powder, to reduce
The dielectric constant of absorbent improves the mismatched degree of dielectric constant and magnetic conductivity, it is found that this method can mention to a certain extent
The electromagnetic wave absorption performance of high flaky powder.The shortcomings that this method is complex treatment process, is not suitable for large-scale production.It is wrapped
The substance covered is namagnetic substance, cannot participate in electro-magnetic wave absorption.Magnetic Nanocrystals Containing material is a kind of high performance soft magnetic materials,
Has very high initial permeability.Due to the special nanostructure of this kind of material: dividing to tiny Sol-Gel particle dispersion
Cloth is on the amorphous magnetism soft magnetism matrix with high resistivity.This structure is very similar to coat one layer of height on nano particle
The amorphous substance of resistivity, and amorphous magnetic material itself is also a kind of efficient electromagnetic wave absorbent material.Especially it is worth referring to
Out, this technique is suitble to be mass produced, simple process.Patent that Han Mangui et al. applies early period (number of patent application:
201610814359.1) iron based nano crystal (ingredient are as follows: Fe can be greatly improved by rapid thermal treatment by proposing(70~90)-
Si(0~15)-(B,P)(0~13)-(Zr,Nb)(0~5)-Cu(0~2)]) high-frequency dielectric constant of pieces of absorbent agent differs with high frequency magnetic conductivity
Larger problem is realized in 1GHz excellent electromagnetic wave absorption performance achieved above.This patent is directed to single layer electromagnetic wave
Absorbing structure.This patent is its subsequent patent, material composition used are as follows: Fe(70~90)-Si(0~15)-(X)(0~13)-
(Me)(0~5)-Cu(0~2)], wherein X=B or C or P；Me=(Zr or Hf or Ti or Al or Nb), but the right proposed here is wanted
Two layers of absorbent structure of 8 seed type of Seeking Truth, be able to achieve more superior performance using the structure: absorbing structure is in 1-10GHz range
It is interior can be by selecting pieces of absorbent agent and thickness Jing Guo different heat treatment with preferable electromagnetic wave absorption performance, absorption spectrum
Degree realizes the flexible control to frequency range is absorbed.
One Typical Representative of Fe-based nanocrystalline magnetically soft alloy material is Fe73.5Cu1Nb3Si13.5B9Alloy.Its magnetic property
It is strongly dependent on its nanostructure.Its nanostructure can be regulated and controled by control heat treatment process.Nanocrystalline obtains
It must be by being heat-treated to non-crystalline material (being amorphous thin ribbon here).Select suitable heat treatment temperature (Ta) can control and receive
The composition of phase in rice structure.By taking the alloy as an example, there are two feature heat treatment temperatures: the 1st phase transition temperature (T for this kind of alloy toolX1)
With the 2nd phase transition temperature (TX2).Heat analysis test is carried out to non-crystalline material frequently with differential scanning calorimeter (DSC) to determine TX1
And TX2Numerical value.For Fe based alloy, different alloying components will have different TX1And TX2Numerical value.
In T < TX1When, no apparent nano-crystallization phenomenon occurs, and the release of some internal stress, magnetic property (coercive only occurs
Power) variation is less.In TX1<Ta<TX2, the solid-state phase changes of generation are precipitations nanometer crystal phase α-Fe (Si) in the soft magnetism matrix of amorphous
Phase.Nanocrystalline size and relative volume percentage is related with heat treatment temperature, heat treatment time.It is nanocrystalline smaller, coercivity
Smaller, the resistivity of alloy powder is bigger, and soft magnet performance is better.Work as Ta>TX2When, solid-state phase changes not only have aforementioned Sol-Gel
Precipitation, but also the non-main phase such as boride (or phosphide, carbide) that several iron can be precipitated, these non-main phases belong to forever
Magnetic phase or non-magnetic phase, so as to cause soft magnet performance deterioration.Our result of study shows that the precipitation of these non-main phases can also be strong
Dielectric properties are influenced strongly.For this patent material therefor, their typical composition and TX1And TX2Temperature is as shown in the table, table
In temperature may be because of the difference in test method or ingredient, the result with other people can be slightly different, but this kind of
One essential characteristic of material is that have 2 different crystallization temperatures, is referred to as high crystallization temperature T hereinX1With low crystallization
Temperature TX2.Table 1 is the crystallization temperature of the disclosed part typical case's Fe base nanometer crystal magnetic material of the prior art.
Summary of the invention:
The technical problem to be solved by the invention is to provide a kind of electro-magnetic wave absorption structures with more preferable performance.
The present invention solve the technical problem the technical solution adopted is that, using iron based nano crystal absorbent electromagnetic wave inhale
Wave structure preparation method, which is characterized in that include the following steps:
1) Fe base nanometer crystal absorbing material, heat treatment temperature T are heat-treated1, obtain the first Fe base nanometer crystal absorbing material；
2) Fe base nanometer crystal absorbing material, heat treatment temperature T are heat-treated2, obtain the 2nd Fe base nanometer crystal absorbing material；
3) the first Fe base nanometer crystal absorbing material is set in the upper surface of metal substrate, forms first and inhales wave layer；
4) wave layer upper surface is inhaled first and the 2nd Fe base nanometer crystal absorbing material is set, form second and inhale wave layer；
The Fe base nanometer crystal absorbing material ingredient is Fe(70~90)-Si(0~15)-(X)(0~13)-(Me)(0~5)-Cu(0~2), under
Marking coefficient indicates atomic percent, X representative element B or C or P；Me represents Zr or Hf or Ti or Al or Nb；
The heat treatment condition of above each step is any of following items:
A, step 1) uses normative heat treatment, TX1<T1<TX2, step 2) is using rapid thermal treatment, TX1<T2<TX2；
B, step 1) uses rapid thermal treatment, TX1<T1<TX2, step 2) is using normative heat treatment, TX1<T2<TX2；
C, step 1) uses normative heat treatment, TX1<T1<TX2, step 2) is using normative heat treatment, T2>TX2；
D, step 1) uses normative heat treatment, T1>TX2, step 2) is using normative heat treatment, TX1<T2<TX2；
E, step 1) uses rapid thermal treatment, TX1<T1<TX2, step 2) is using rapid thermal treatment, T2>TX2；
F, step 1) uses rapid thermal treatment, T1>TX2, step 2) is using rapid thermal treatment, TX1<T2<TX2；
G, step 1) uses rapid thermal treatment, T1>TX2, step 2) is using normative heat treatment, T2>TX2；
H, step 1) uses normative heat treatment, T1>TX2, step 2) is using rapid thermal treatment, T2>TX2；
The TX1For the low crystallization temperature of amorphous alloy, TX2For the high crystallization temperature of amorphous alloy；
The rapid thermal treatment a length of heat treatment in 5 seconds to 30 minutes when being, the normative heat treatment are that duration is more than 30
The heat treatment of minute.
Fe base nanometer crystal absorbing material is Fe base nanometer crystal flaky powder material.
First inhales wave layer with a thickness of 0.1mm~5mm, and second inhales wave layer with a thickness of 0.1mm~5mm.Two layers of Fe base nanometer crystal
Absorbing material is arranged on metallic substrates by bonding agent.
Can be had in 1-10GHz frequency range internal ratio single-layer absorption structure using the absorbing material of the technology of the present invention and preferably be inhaled
Performance: stronger assimilation effect (i.e. bigger reflection loss) is received, more flexible absorption frequency range is adjusted, thinner absorption thickness
Degree.
Detailed description of the invention
Fig. 1 is Fe base nanometer crystal flaky powder material typical microstructure photo.
Fig. 2 is absorbent structure schematic diagram prepared by the present invention.
Fig. 3 is high-frequency dielectric performance (real part) curve graph that flaky powder is heat-treated under different temperatures.
Fig. 4 is high-frequency dielectric performance (imaginary part) curve graph that flaky powder is heat-treated under different temperatures.
Fig. 5 is sheet alloy powder absorbent photo.
Fig. 6 is the electromagnetic wave absorption performance curve graph of the 1st kind of two layers of absorbent structure.
Fig. 7 is the electromagnetic wave absorption performance curve graph (different-thickness) of the 1st kind of two layers of absorbent structure.
Fig. 8 is the electromagnetic wave absorption performance curve graph of the 2nd kind of two layers of absorbent structure.
Fig. 9 is the electromagnetic wave absorption performance curve graph of the 3rd, 4 kind of two layers of absorbent structure.
Figure 10 is the electromagnetic wave absorption performance curve graph of the 5th, 6 kind of two layers of absorbent structure.
Figure 11 is the electromagnetic wave absorption performance curve graph of the 7th, 8 kind of two layers of absorbent structure.
Figure 12 is the electromagnetic wave absorption performance curve graph of the first single layer absorbent structure.
Figure 13 is the electromagnetic wave absorption performance curve graph of the first single layer absorbent structure.
Specific embodiment
The present invention selects Fe base nanometer crystal flaky powder material as absorbent and is several reasons: (1) material has
Biggish saturation magnetization, it is ensured that material has certain high frequency magnetic conductivity in 1GHz or more；(2) material has spy
Different microstructure: amorphous phase is coated with a nanometer crystal phase, the two mutually all have ferromagnetic property, can participate in the suction of electromagnetic wave
It receives；(3) compared with other magnetic alloys (Fe, Co, Ni etc.), its special microstructure can be such that its dielectric constant drops significantly
It is low, the mismatch of electromagnetic parameter under high frequency (dielectric parameter and magnetic conductivity) is improved, to be expected to that electromagnetic wave can be greatly improved
Absorbent properties.(4) by changing the opposite of material nano crystal phase, amorphous phase and the Fe-B phase (Fe-P or Fe-C phase) under high temperature
Volume, this kind of material high-frequency electromagnetic parameter of the further flexible modulation of energy, to adapt to different application bands, and can substantially reduce
The preparation cost and time cost of material.The typical microstructure of this kind of material is as shown in Figure 1.This microstructure is obtained,
The feature crystallization temperature of this kind of material must first be found out (as previously described: TX1And TX2).Because the first step of this kind of material is to prepare
Then amorphous thin ribbon out formulates different heat treatment process to obtain required microstructure.The innovative point of this patent is me
Devise a series of iron based nano crystal material, its ingredient is Fe(70~90)-Si(0~15)-(X)(0~13)-(Me)(0~5)-
Cu(0~2), wherein X is element B or C or P；Me is Zr or Hf or Ti or Al or Nb, and to the amorphous thin ribbon of the series components alloy
Different heat treatment is carried out, finally proposes a kind of 2 layers of absorbent structure (as shown in Figure 2).In this configuration, every layer of suction used
Receiving agent Fe base nanometer crystal powder is by different heat treatment process.Since each layer of electromagnetic parameter is inhaled depending on the layer
The electromagnetic parameter for receiving agent, may be implemented the absorbent properties more excellent than single-layer absorption body by the combination of cleverly layer structure.
The present invention sprays upper two layers of absorbing material on metallic substrates, and internal layer is known as " first layer ", and outermost layer is known as " second
Layer ", pieces of absorbent agent have passed through different heat treatment process in every layer of absorbing material.Heat treatment temperature (Ta) it is to be closed according to amorphous
Crystallization temperature (the T of goldX1And TX2) depending on: (1) TX1<Ta<TX2；(2)Ta>TX2It is convenient for distinguishing, herein by the heat of first layer
Treatment temperature Ta is known as T1, the heat treatment temperature Ta of the second layer is known as T2, it is divided into two kinds according to heat treatment time, one is fast
Speed heat handles (heat treatment time was at -30 minutes 5 seconds), and another kind is normative heat treatment (heat treatment time is greater than 30 minutes).Heat
Processing carries out (argon gas or nitrogen) in protective atmosphere.Fig. 3 and Fig. 4 shows the height that flaky powder is heat-treated under different temperatures
Frequency dielectric properties.
It is Fe with ingredient73.5Cu1Nb3Si13.5B9For the amorphous fe-base alloy thin band of (being named as " FINEMET " alloy).
It is heat-treated under protection of argon gas first.The temperature and time of normative heat treatment is that (1 is small for 500 DEG C (1 hours) and 800 DEG C
When).The temperature and time of rapid thermal treatment is 600 DEG C (8 minutes) and 800 DEG C (8 minutes).Powder after heat treatment is using high
Flaky powder is made in energy ball-milling technology, and after the electromagnetic parameter for measuring them, the electromagnetic wave that we characterize two layers of wave-absorber is inhaled
It receives performance: investigating the numerical value of reflection loss RL and inhale wave bandwidth BW (referring to RL < -10dB frequency range).
(1) 2 layers of absorbing material double-layer structure Class1: are sprayed on metallic substrates: by normative heat treatment (at 500 DEG C
Heat preservation 1 hour) processing FINEMET sheet alloy powder be first layer absorbent, the layer is with a thickness of 0.5mm；It will be at 600 DEG C
Lower progress rapid thermal treatment (the heat preservation 8 minutes) absorbent of FINEMET sheet alloy powder as the second layer, this layer with a thickness of
3mm.It was found that the reflection loss RL at 4GHz is -21.73dB.Reflection loss RL < -10dB suction wave bandwidth BW is
[3.23GHz-5.24GHz].As shown in Figure 6.
(2) double-layer structure Class1: the absorbent of first layer is to be heat-treated (soaking time is 1 hour) by 500 DEG C
FINEMET superalloy sheet powder.This layer with a thickness of 1mm.The absorbent of the second layer is by 600 DEG C of heat treatment (soaking times
Be 8 minutes) FINEMET superalloy sheet powder.This layer with a thickness of 4mm.The absorbing property of 2 layers of total absorbent structure: discovery
Reflection loss RL at 2.6GHz is -31.67dB.Reflection loss RL < -10dB suction wave bandwidth BW is [2.08GHz-
3.39GHz].As shown in Figure 7.
(3) double-layer structure type 2: the absorbent of first layer is to be heat-treated (soaking time is 8 minutes) by 600 DEG C
FINEMET superalloy sheet powder.This layer with a thickness of 4mm.The absorbent of the second layer is by 500 DEG C of conventional long heat treatments
The FINEMET superalloy sheet powder of (soaking time is 1 hour).This layer with a thickness of 0.1mm.The suction of 2 layers of total absorbent structure
Wave performance are as follows: reflection loss RL of the discovery at 3.3GHz is -35.96dB.Reflection loss RL < -10dB suction wave bandwidth BW is
[2.69GHz–4.0GHz].However, when first layer is with a thickness of 4mm, the second layer with a thickness of 1mm when, do not show but
Absorbing property.It can be seen that the thickness of the suction wave layer containing normative heat treatment flaky powder cannot be excessive.As shown in Figure 8.
(4) double-layer structure type 3: the absorbent of first layer is to be heat-treated (soaking time is 8 minutes) by 800 DEG C
FINEMET superalloy sheet powder, and this layer with a thickness of 4mm；The absorbent of the second layer is to be heat-treated (when heat preservation by 500 DEG C
Between be 1 hour) FINEMET superalloy sheet powder, and this layer with a thickness of 0.1mm.The wave absorbtion of two layers total of absorbent structure
It can are as follows: reflection loss RL of the discovery at 2.43GHz is -24.30dB.Reflection loss RL < -10dB suction wave bandwidth BW is
[2.0GHz–2.85GHz].As shown in Figure 9.
(5) double-layer structure type 4: when the absorbent of first layer is the piece for being heat-treated (soaking time is 1 hour) at 500 DEG C
Shape alloy powder, and the layer is with a thickness of 0.1mm；The flaky powder of the second layer passes through 800 DEG C of heat treatments (soaking time 8 minutes),
The layer is with a thickness of 4mm.It was found that the RL at 2.51GHz is -33.93dB.Reflection loss RL < -10dB suction wave bandwidth BW is
[2.14GHz–3.02GHz].As shown in Figure 9.
DEG C 6) double-layer structure type 5: the absorbent of first layer is to be heat-treated (soaking time is 8 minutes) by 600 DEG C
FINEMET superalloy sheet powder.This layer with a thickness of 0.5mm.The absorbent of the second layer is (to protect by 800 DEG C of rapid thermal treatments
The warm time be 8 minutes) FINEMET superalloy sheet powder.This layer with a thickness of 3mm.The absorbing property of 2 layers of total absorbent structure
Are as follows: RL of the discovery at 3.13GHz is -30.98dB.Reflection loss RL < -10dB suction wave bandwidth BW is [2.6GHz -
3.74GHz].As shown in Figure 10.
(7) double-layer structure type 6: it is in addition interesting to be the discovery that, when the absorbent of first layer is to be heat-treated by 800 DEG C
The FINEMET superalloy sheet powder of (soaking time be 8 minutes), and this layer with a thickness of 0.5mm, the absorbent of the second layer is warp
The FINEMET superalloy sheet powder for crossing 600 DEG C of heat treatments (soaking time is 8 minutes), when the layer is with a thickness of 3mm, optimal suction
Wave frequency rate and bandwidth are changed, and the RL at 4.26GHz is -24.68dB, and suction wave bandwidth BW is [3.56-
5.14GHz].As shown in Figure 10.
(8) double-layer structure type 7: the absorbent of first layer is to be heat-treated (soaking time is 1 hour) by 800 DEG C
FINEMET superalloy sheet powder.This layer with a thickness of 0.5mm.The absorbent of the second layer is to be heat-treated (when heat preservation by 800 DEG C
Between be 8 minutes) FINEMET superalloy sheet powder.This layer with a thickness of 3mm.The absorbing property of 2 layers of total absorbent structure are as follows:
It was found that the RL at 2.95GHz is -22.76dB.Reflection loss RL < -10dB suction wave bandwidth BW is [2.52GHz -
3.57GHz].As shown in figure 11.
(9) double-layer structure type 8: when first layer is the FINEMET for being heat-treated (soaking time is 8 minutes) by 800 DEG C
Superalloy sheet powder, and this layer with a thickness of 3mm, the absorbent of the second layer is that (soaking time is 1 small by 800 DEG C of heat treatments
When) FINEMET superalloy sheet powder, when the layer is with a thickness of 0.1mm, optimal suction wave frequency rate and bandwidth are changed,
RL at 3.39GHz is -17.87dB, and inhaling wave bandwidth BW is [2.83-4.0GHz].As shown in figure 11.
(10) as the comparison of performance, we characterize the performance of single layer wave-absorber.Absorbent in single layer wave-absorber
For by 500 DEG C of heat treatment, 1 hour flaky powder, and when with a thickness of 3mm, its absorbing property is as shown in figure 12: RL only-
5.36dB.Absorbing property is much smaller than multilayered structure.
It (11) when flaky powder absorbent is small by 800 DEG C of heat treatments 1, and is that it is as absorbent with a thickness of 4mm
The performance of single layer absorbent structure is as shown in figure 13, radiation losses RL > -5.0dB, it is seen that its absorbing property is also far smaller than multilayer
Structure.
Claims (3)
1. using the rubber-ferrite structure preparation method of iron based nano crystal absorbent, which is characterized in that include the following steps:
1) Fe base nanometer crystal absorbing material, heat treatment temperature T are heat-treated1, obtain the first Fe base nanometer crystal absorbing material；
2) Fe base nanometer crystal absorbing material, heat treatment temperature T are heat-treated2, obtain the 2nd Fe base nanometer crystal absorbing material；
3) the first Fe base nanometer crystal absorbing material is set in the upper surface of metal substrate, forms first and inhales wave layer；
4) wave layer upper surface is inhaled first and the 2nd Fe base nanometer crystal absorbing material is set, form second and inhale wave layer；
The Fe base nanometer crystal absorbing material ingredient is Fe(70~90)-Si(0~15)-(X)(0~13)-(Me)(0~5)-Cu(0~2), subscript system
Number indicates atomic percent, X representative element B or C or P；Me represents Zr or Hf or Ti or Al or Nb；
The heat treatment condition of above each step is any of following items:
A, step 1) uses normative heat treatment, TX1<T1<TX2, step 2) is using rapid thermal treatment, TX1<T2<TX2；
B, step 1) uses rapid thermal treatment, TX1<T1<TX2, step 2) is using normative heat treatment, TX1<T2<TX2；
C, step 1) uses normative heat treatment, TX1<T1<TX2, step 2) is using normative heat treatment, T2>TX2；
D, step 1) uses normative heat treatment, T1>TX2, step 2) is using normative heat treatment, TX1<T2<TX2；
E, step 1) uses rapid thermal treatment, TX1<T1<TX2, step 2) is using rapid thermal treatment, T2>TX2；
F, step 1) uses rapid thermal treatment, T1>TX2, step 2) is using rapid thermal treatment, TX1<T2<TX2；
G, step 1) uses rapid thermal treatment, T1>TX2, step 2) is using normative heat treatment, T2>TX2；
H, step 1) uses normative heat treatment, T1>TX2, step 2) is using rapid thermal treatment, T2>TX2；
The TX1For the low crystallization temperature of amorphous alloy, TX2For the high crystallization temperature of amorphous alloy；
The rapid thermal treatment a length of heat treatment in 5 seconds to 30 minutes when being, the normative heat treatment are that duration is more than 30 minutes
Heat treatment.
2. using the rubber-ferrite structure preparation method of iron based nano crystal absorbent as described in claim 1, feature exists
In Fe base nanometer crystal absorbing material is Fe base nanometer crystal flaky powder material.
3. using the rubber-ferrite structure preparation method of iron based nano crystal absorbent as described in claim 1, feature exists
In first inhales wave layer with a thickness of 0.1mm~5mm, and second inhales wave layer with a thickness of 0.1mm~5mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111564704A (en) * | 2020-04-29 | 2020-08-21 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Tunable wave-absorbing metamaterial based on ferromagnetic resonance |
| CN114045435A (en) * | 2021-11-11 | 2022-02-15 | 泉州天智合金材料科技有限公司 | Iron-based amorphous nanocrystalline wave-absorbing material and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111564704A (en) * | 2020-04-29 | 2020-08-21 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Tunable wave-absorbing metamaterial based on ferromagnetic resonance |
| CN111564704B (en) * | 2020-04-29 | 2022-02-15 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Tunable wave-absorbing metamaterial based on ferromagnetic resonance |
| CN114045435A (en) * | 2021-11-11 | 2022-02-15 | 泉州天智合金材料科技有限公司 | Iron-based amorphous nanocrystalline wave-absorbing material and preparation method thereof |
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