CN103551568B - A kind of preparation method of scale-like nanocrystalline high temperature microwave absorbent - Google Patents
A kind of preparation method of scale-like nanocrystalline high temperature microwave absorbent Download PDFInfo
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Abstract
The present invention discloses a kind of preparation method of scale-like nanocrystalline high temperature microwave absorbent, belongs to field of microwave absorption.Mainly comprise: adopt gas atomization to prepare spherical FeCo powder, obtain flakey nano-crystalline Fe Co powder through mechanical ball milling.FeCo wave absorbing agent prepared by the present invention has the feature of high magnetic permeability, high saturation and magnetic intensity, high-curie temperature and low-k, can be used for the absorbing material of room temperature ~ 600 DEG C, 2 ~ 10GHz.Present invention process is simple, and cost is low, is applicable to producing in enormous quantities, has a extensive future.
Description
Technical field
The invention discloses a kind of preparation method of scale-like nanocrystalline high temperature microwave absorbent, belong to field of microwave absorption.
Background technology
Microwave absorbing material refer to can absorb, attenuate incident electromagnetic wave, and converts electromagnetic energy to other forms of energy and dissipate, or modulated electromagnetic wave makes it because interfering the class functional material disappeared mutually.Microwave absorbing material is divided into structural absorbing mater ials and coating-type absorbing materials substantially, wherein coating-type absorbing materials by absorbent and be stained with knot agent form, absorbent is core technology.
Along with the high speed development of microwave applications, increasing field needs to use microwave absorbing material, and improves gradually the requirement of microwave absorbing material, and demand possesses the high-performance wave-absorbing material of property at special dimension.
How field of microwave absorption, at high operating temperatures, make absorbing material have at low-frequency range 2 ~ 10GHz the technical barrier that excellent absorbing property is microwave absorbing material always.Metal magnetic powder microwave absorption mainly carrys out attenuation by absorption electromagnetic wave by magnetic hystersis loss, eddy-current loss, and there is the advantage that Curie temperature is high, within the scope of 2 ~ 10GHz, saturation magnetization and magnetic conductivity higher, be beneficial to like this and realize absorbing material raising of microwave absorbing property in low-frequency range when thinner thickness.But in general, use fast quenching to get rid of band and add high-energy ball milling, mechanical alloying, self-propagating combustion, the methods such as chemical method prepare alloy powder, in application more or less have some drawbacks.
On April 12nd, 2010, He Yaqiong, Mao Changhui, the people such as Yang Jian have applied for Chinese invention patent " a kind of (FeCo) N microwave absorbing material and preparation method thereof " (application number 201010146728.7), disclose one to be prepared by mechanical alloying, use high-energy mechanical ball milling refinement, eventually pass the microwave absorption that nitrogenize is prepared from, there is higher saturation magnetization, low remanent magnetization and coercivity, absorbing property is excellent.Its feature is last nitriding process, and owing to using mechanical alloying, its granule size distributing homogeneity is poor, and dielectric constant is too high.
On June 20th, 2008, Zhang Haiyan, Wu Ziqiu, a heavily fortified point have applied for Chinese invention patent " a kind of nanocrystalline ultra-fine alloy powder electromagnetic wave absorbent and preparation method thereof " (application number 200810028925.1), disclose a kind of binary of being made up of Fe, Co, Ni or ternary alloy three-partalloy powder, self-propagating combustion is used to send out the nanocrystalline ultra-fine alloy powder be prepared from, to electromagnetic wave particularly frequency electromagnetic waves there are excellent absorbent properties, but, self-propagating combustion is used to prepare wave absorbing agent, cost is high, complex process, has many drawbacks.
On October 28th, 2009, Han Zheng, Li Da etc. have applied for Chinese invention patent " a kind of preparation method of carbon-wrapped iron-cobalt nano wave-absorbing material " (application number 200910011350.7), disclose a kind of Nano capsule by wrapping up carbon outside nano-level iron cobalt alloy and forming, cathode and anode arc discharge under working gas (argon gas) is adopted to produce the technology preparation of plasma, but this absorbing material is when smaller thickness, and in low-frequency range, absorbing property is poor.
On December 18th, 2009, Yang Zhimin, Mao Changhui, Yang Jian, Ma Shuwang has applied for Chinese invention patent " a kind of thin low-frequency wave-absorbing material and preparation method thereof " (application number 200910241997.9), disclose a kind of low-frequency wave-absorbing material, this absorbing material uses the granularity aluminium oxide that coated thickness is 25nm ~ 35nm outside the FeCo alloyed powder of 0.25 μm ~ 0.35 μm as microwave absorption, absorbing material is mixed with into according to a certain percentage with phenolic resins, material the highest microwave absorbing property having-16dB in 1 ~ 4GHz band limits of 1.1 ~ 2mm, frequency range is narrower, and complicated process of preparation.
Summary of the invention
The object of the invention is to propose one in room temperature ~ 600 DEG C, there is in the band limits of 2 ~ 10GHz the preparation method of a kind of scale-like nanocrystalline high temperature microwave absorbent of excellent absorbing property.
First this method adopts the method for inert gas aerosolization to prepare spherical FeCo powder, then makes spherical FeCo powder change final flakey nano-crystalline Fe Co powder into through wet method high-energy ball milling.The present invention's absolute ethyl alcohol, acetone or gasoline do ball-milling medium, make surfactant, Ball-milling Time 1 ~ 12h with the stearic acid of 0.5% ~ 5.0% of spherical FeCo opaque amount, and preparation technology is simple, save time and energy-conservation.
The preparation method of this microwave absorption comprises the following steps:
(1) vacuum melting: ingot iron, electrolytic cobalt are that 1:1 carries out vacuum induction melting and obtains FeCo alloy pig by Fe:Co atomic ratio;
(2) inert gas atomizer: FeCo alloy melting is warming up to 1600 DEG C ~ 1800 DEG C, adopts argon gas or nitrogen to carry out atomized producing ball-shaped FeCo powder;
(3) mechanical ball milling: spherical FeCo powder changes flakey nano-crystalline Fe Co powder through mechanical ball milling, ratio of grinding media to material is 5:1 ~ 20:1, ball-milling medium is absolute ethyl alcohol, acetone or gasoline, surfactant is stearic acid, stearic addition is 0.5% ~ 5.0% of spherical FeCo powder, and Ball-milling Time is 1 ~ 12h.
The present invention proposes the spherical FeCo powder using the method for aerosolization to prepare and do raw material, spherical FeCo powder is made to change the method for flakey nano-crystalline Fe Co powder into by high-energy mechanical ball milling, FeCo wave absorbing agent prepared by the present invention has the feature of high magnetic permeability, high saturation and magnetic intensity, high-curie temperature and low-k, can be used for the absorbing material of room temperature ~ 600 DEG C, 2 ~ 10GHz.Present invention process is simple, and cost is low, is applicable to producing in enormous quantities, has a extensive future.
Accompanying drawing explanation
Fig. 1 is the stereoscan photograph of the wave absorbing agent of the invention process example 1 embodiment 1 preparation
Fig. 2 is the stereoscan photograph of the wave absorbing agent of the invention process example 2 embodiment 2 preparation
Fig. 3 is the stereoscan photograph of the wave absorbing agent of the invention process example 3 embodiment 3 preparation
Fig. 4 is the stereoscan photograph of the wave absorbing agent of the invention process example 4 embodiment 4 preparation
Fig. 5 is the stereoscan photograph of the wave absorbing agent of the invention process example 5 embodiment 5 preparation
Fig. 6 is the stereoscan photograph of the wave absorbing agent of the invention process example 6 embodiment 6 preparation
Fig. 7 is the stereoscan photograph of the wave absorbing agent of the invention process example 7 embodiment 7 preparation
Fig. 8 is the stereoscan photograph of the wave absorbing agent of the invention process example 8 embodiment 8 preparation
Fig. 9 is the stereoscan photograph of the wave absorbing agent of the invention process example 9 embodiment 9 preparation
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, but be not only confined to following embodiment.
Embodiment 1
Employing ingot iron, electrolytic cobalt are raw material, are the FeCo alloy pig that 1:1 carries out that vacuum induction melting prepares uniform composition by Fe:Co atomic ratio; The FeCo alloy pig vacuum induction of above-mentioned preparation is heated to 1600 DEG C, is atomized and dusts after alloy fully melts, cooling medium used is argon gas or nitrogen, and be preferably argon gas, air pressure is 3.5MPa, obtained spherical FeCo powder.
Mechanical ball milling is carried out to above-mentioned obtained spherical FeCo powder, abrading-ball is quenching stainless steel ball, ratio of grinding media to material is 5:1, wet ball grinding medium is absolute ethyl alcohol, acetone or gasoline, be preferably absolute ethyl alcohol, the volume of absolute ethyl alcohol is 1/3rd of ball grinder capacity, and add the stearic acid of spherical FeCo powder quality 0.5% as surfactant, Ball-milling Time is 1h; After filtering taking-up powder, be placed in electric drying oven with forced convection, volatilize completely to alcohol in 70 DEG C of oven dry, obtain flakey nano-crystalline Fe Co powder.
The flaky powder electromicroscopic photograph prepared as shown in Figure 1, after 7:3 heats and mixes in mass ratio by powder sample and paraffin, be pressed into mould the coaxial rings sample that internal diameter is 3.04mm, external diameter 7.0mm, thickness are 2 ~ 4mm and carry out electromagnetic performance test within the scope of 2 ~ 10GHz.Utilize the electromagnetic parameter of gained to simulate the absorbing property of thickness for 1.6mm sample and the relation of frequency, result represents: Reflectionloss peak value appears at 5.66GHz ， Wei – 9.43dB.
Embodiment 2
Employing ingot iron, electrolytic cobalt are raw material, are the FeCo alloy pig that 1:1 carries out that vacuum induction melting prepares uniform composition by Fe:Co atomic ratio; The FeCo alloy pig vacuum induction of above-mentioned preparation is heated to 1600 DEG C, is atomized and dusts after alloy fully melts, cooling medium used is argon gas or nitrogen, and be preferably argon gas, air pressure is 3.5MPa, obtained spherical FeCo powder.
Mechanical ball milling is carried out to above-mentioned obtained spherical FeCo powder, abrading-ball is quenching stainless steel ball, ratio of grinding media to material is 10:1, wet ball grinding medium is absolute ethyl alcohol, acetone or gasoline, be preferably absolute ethyl alcohol, the volume of absolute ethyl alcohol is 1/3rd of ball grinder capacity, and add the stearic acid of spherical FeCo powder quality 3.0% as surfactant, Ball-milling Time is 6h; After filtering taking-up powder, be placed in electric drying oven with forced convection, volatilize completely to alcohol in 70 DEG C of oven dry, obtain flakey nano-crystalline Fe Co powder.
The flaky powder electromicroscopic photograph prepared as shown in Figure 2, after 7:3 heats and mixes in mass ratio by powder sample and paraffin, be pressed into mould the coaxial rings sample that internal diameter is 3.04mm, external diameter 7.0mm, thickness are 2 ~ 4mm and carry out electromagnetic performance test within the scope of 2 ~ 10GHz.Utilize the electromagnetic parameter of gained to simulate the absorbing property of thickness for 1.6mm sample and the relation of frequency, result represents: Reflectionloss peak value appears at 3.56GHz ， Wei – 11.15dB.
Embodiment 3
Employing ingot iron, electrolytic cobalt are raw material, are the FeCo alloy pig that 1:1 carries out that vacuum induction melting prepares uniform composition by Fe:Co atomic ratio; The FeCo alloy pig vacuum induction of above-mentioned preparation is heated to 1600 DEG C, is atomized and dusts after alloy fully melts, cooling medium used is argon gas or nitrogen, and be preferably argon gas, air pressure is 3.5MPa, obtained spherical FeCo powder.
Mechanical ball milling is carried out to above-mentioned obtained spherical FeCo powder, abrading-ball is quenching stainless steel ball, ratio of grinding media to material is 20:1, wet ball grinding medium is absolute ethyl alcohol, acetone or gasoline, be preferably absolute ethyl alcohol, the volume of absolute ethyl alcohol is 1/3rd of ball grinder capacity, and add the stearic acid of spherical FeCo powder quality 5.0% as surfactant, Ball-milling Time is 12h; After filtering taking-up powder, be placed in electric drying oven with forced convection, volatilize completely to alcohol in 70 DEG C of oven dry, obtain flakey nano-crystalline Fe Co powder.
The flaky powder electromicroscopic photograph prepared as shown in Figure 3, after 7:3 heats and mixes in mass ratio by powder sample and paraffin, be pressed into mould the coaxial rings sample that internal diameter is 3.04mm, external diameter 7.0mm, thickness are 2 ~ 4mm and carry out electromagnetic performance test within the scope of 2 ~ 10GHz.Utilize the electromagnetic parameter of gained to simulate the absorbing property of thickness for 1.6mm sample and the relation of frequency, result represents: Reflectionloss peak value appears at 3.56GHz ， Wei – 11.41dB.
Embodiment 4
Employing ingot iron, electrolytic cobalt are raw material, are the FeCo alloy pig that 1:1 carries out that vacuum induction melting prepares uniform composition by Fe:Co atomic ratio; The FeCo alloy pig vacuum induction of above-mentioned preparation is heated to 1700 DEG C, is atomized and dusts after alloy fully melts, cooling medium used is argon gas or nitrogen, and be preferably argon gas, air pressure is 3.5MPa, obtained spherical FeCo powder.
Mechanical ball milling is carried out to above-mentioned obtained spherical FeCo powder, abrading-ball is quenching stainless steel ball, ratio of grinding media to material is 5:1, wet ball grinding medium is absolute ethyl alcohol, acetone or gasoline, be preferably absolute ethyl alcohol, the volume of absolute ethyl alcohol is 1/3rd of ball grinder capacity, and add the stearic acid of spherical FeCo powder quality 3.0% as surfactant, Ball-milling Time is 12h; After filtering taking-up powder, be placed in electric drying oven with forced convection, volatilize completely to alcohol in 70 DEG C of oven dry, obtain flakey nano-crystalline Fe Co powder.
The flaky powder electromicroscopic photograph prepared as shown in Figure 4, after 7:3 heats and mixes in mass ratio by powder sample and paraffin, be pressed into mould the coaxial rings sample that internal diameter is 3.04mm, external diameter 7.0mm, thickness are 2 ~ 4mm and carry out electromagnetic performance test within the scope of 2 ~ 10GHz.Utilize the electromagnetic parameter of gained to simulate the absorbing property of thickness for 1.6mm sample and the relation of frequency, result represents: Reflectionloss peak value appears at 3.14GHz ， Wei – 16.80dB.
Embodiment 5
Employing ingot iron, electrolytic cobalt are raw material, are the FeCo alloy pig that 1:1 carries out that vacuum induction melting prepares uniform composition by Fe:Co atomic ratio; The FeCo alloy pig vacuum induction of above-mentioned preparation is heated to 1700 DEG C, is atomized and dusts after alloy fully melts, cooling medium used is argon gas or nitrogen, and be preferably argon gas, air pressure is 3.5MPa, obtained spherical FeCo powder.
Mechanical ball milling is carried out to above-mentioned obtained spherical FeCo powder, abrading-ball is quenching stainless steel ball, ratio of grinding media to material is 10:1, wet ball grinding medium is absolute ethyl alcohol, acetone or gasoline, be preferably absolute ethyl alcohol, the volume of absolute ethyl alcohol is 1/3rd of ball grinder capacity, and add the stearic acid of spherical FeCo powder quality 5.0% as surfactant, Ball-milling Time is 1h; After filtering taking-up powder, be placed in electric drying oven with forced convection, volatilize completely to alcohol in 70 DEG C of oven dry, obtain flakey nano-crystalline Fe Co powder.
The flaky powder electromicroscopic photograph prepared as shown in Figure 5, after 7:3 heats and mixes in mass ratio by powder sample and paraffin, be pressed into mould the coaxial rings sample that internal diameter is 3.04mm, external diameter 7.0mm, thickness are 2 ~ 4mm and carry out electromagnetic performance test within the scope of 2 ~ 10GHz.Utilize the electromagnetic parameter of gained to simulate the absorbing property of thickness for 1.6mm sample and the relation of frequency, result represents: Reflectionloss peak value appears at 3.39GHz ， Wei – 11.57dB.
Embodiment 6
Employing ingot iron, electrolytic cobalt are raw material, are the FeCo alloy pig that 1:1 carries out that vacuum induction melting prepares uniform composition by Fe:Co atomic ratio; The FeCo alloy pig vacuum induction of above-mentioned preparation is heated to 1700 DEG C, is atomized and dusts after alloy fully melts, cooling medium used is argon gas or nitrogen, and be preferably argon gas, air pressure is 3.5MPa, obtained spherical FeCo powder.
Mechanical ball milling is carried out to above-mentioned obtained spherical FeCo powder, abrading-ball is quenching stainless steel ball, ratio of grinding media to material is 20:1, wet ball grinding medium is absolute ethyl alcohol, acetone or gasoline, be preferably absolute ethyl alcohol, the volume of absolute ethyl alcohol is 1/3rd of ball grinder capacity, and add the stearic acid of spherical FeCo powder quality 0.5% as surfactant, Ball-milling Time is 6h; After filtering taking-up powder, be placed in electric drying oven with forced convection, volatilize completely to alcohol in 70 DEG C of oven dry, obtain flakey nano-crystalline Fe Co powder.
The flaky powder electromicroscopic photograph prepared as shown in Figure 6, after 7:3 heats and mixes in mass ratio by powder sample and paraffin, be pressed into mould the coaxial rings sample that internal diameter is 3.04mm, external diameter 7.0mm, thickness are 2 ~ 4mm and carry out electromagnetic performance test within the scope of 2 ~ 10GHz.Utilize the electromagnetic parameter of gained to simulate the absorbing property of thickness for 1.6mm sample and the relation of frequency, result represents: Reflectionloss peak value appears at 5.53GHz ， Wei – 10.51dB.
Embodiment 7
Employing ingot iron, electrolytic cobalt are raw material, are the FeCo alloy pig that 1:1 carries out that vacuum induction melting prepares uniform composition by Fe:Co atomic ratio; The FeCo alloy pig vacuum induction of above-mentioned preparation is heated to 1800 DEG C, is atomized and dusts after alloy fully melts, cooling medium used is argon gas or nitrogen, and be preferably argon gas, air pressure is 3.5MPa, obtained spherical FeCo powder.
Mechanical ball milling is carried out to above-mentioned obtained spherical FeCo powder, abrading-ball is quenching stainless steel ball, ratio of grinding media to material is 5:1, wet ball grinding medium is absolute ethyl alcohol, acetone or gasoline, be preferably absolute ethyl alcohol, the volume of absolute ethyl alcohol is 1/3rd of ball grinder capacity, and add the stearic acid of spherical FeCo powder quality 5.0% as surfactant, Ball-milling Time is 6h; After filtering taking-up powder, be placed in electric drying oven with forced convection, volatilize completely to alcohol in 70 DEG C of oven dry, obtain flakey nano-crystalline Fe Co powder.
The flaky powder electromicroscopic photograph prepared as shown in Figure 7, after 7:3 heats and mixes in mass ratio by powder sample and paraffin, be pressed into mould the coaxial rings sample that internal diameter is 3.04mm, external diameter 7.0mm, thickness are 2 ~ 4mm and carry out electromagnetic performance test within the scope of 2 ~ 10GHz.Utilize the electromagnetic parameter of gained to simulate the absorbing property of thickness for 1.6mm sample and the relation of frequency, result represents: Reflectionloss peak value appears at 3.39GHz ， Wei – 11.57dB.
Embodiment 8
Employing ingot iron, electrolytic cobalt are raw material, are the FeCo alloy pig that 1:1 carries out that vacuum induction melting prepares uniform composition by Fe:Co atomic ratio; The FeCo alloy pig vacuum induction of above-mentioned preparation is heated to 1800 DEG C, is atomized and dusts after alloy fully melts, cooling medium used is argon gas or nitrogen, and be preferably argon gas, air pressure is 3.5MPa, obtained spherical FeCo powder.
Mechanical ball milling is carried out to above-mentioned obtained spherical FeCo powder, abrading-ball is quenching stainless steel ball, ratio of grinding media to material is 10:1, wet ball grinding medium is absolute ethyl alcohol, acetone or gasoline, be preferably absolute ethyl alcohol, the volume of absolute ethyl alcohol is 1/3rd of ball grinder capacity, and add the stearic acid of spherical FeCo powder quality 0.5% as surfactant, Ball-milling Time is 12h; After filtering taking-up powder, be placed in electric drying oven with forced convection, volatilize completely to alcohol in 70 DEG C of oven dry, obtain flakey nano-crystalline Fe Co powder.
The flaky powder electromicroscopic photograph prepared as shown in Figure 8, after 7:3 heats and mixes in mass ratio by powder sample and paraffin, be pressed into mould the coaxial rings sample that internal diameter is 3.04mm, external diameter 7.0mm, thickness are 2 ~ 4mm and carry out electromagnetic performance test within the scope of 2 ~ 10GHz.Utilize the electromagnetic parameter of gained to simulate the absorbing property of thickness for 1.6mm sample and the relation of frequency, result represents: Reflectionloss peak value appears at 7.82GHz ， Wei – 15.59dB.
Embodiment 9
Employing ingot iron, electrolytic cobalt are raw material, are the FeCo alloy pig that 1:1 carries out that vacuum induction melting prepares uniform composition by Fe:Co atomic ratio; The FeCo alloy pig vacuum induction of above-mentioned preparation is heated to 1800 DEG C, is atomized and dusts after alloy fully melts, cooling medium used is argon gas or nitrogen, and be preferably argon gas, air pressure is 3.5MPa, obtained spherical FeCo powder.
Mechanical ball milling is carried out to above-mentioned obtained spherical FeCo powder, abrading-ball is quenching stainless steel ball, ratio of grinding media to material is 20:1, wet ball grinding medium is absolute ethyl alcohol, acetone or gasoline, be preferably absolute ethyl alcohol, the volume of absolute ethyl alcohol is 1/3rd of ball grinder capacity, and add the stearic acid of spherical FeCo powder quality 3.0% as surfactant, Ball-milling Time is 1h; After filtering taking-up powder, be placed in electric drying oven with forced convection, volatilize completely to alcohol in 70 DEG C of oven dry, obtain flakey nano-crystalline Fe Co powder.
The flaky powder electromicroscopic photograph prepared as shown in Figure 9, after 7:3 heats and mixes in mass ratio by powder sample and paraffin, be pressed into mould the coaxial rings sample that internal diameter is 3.04mm, external diameter 7.0mm, thickness are 2 ~ 4mm and carry out electromagnetic performance test within the scope of 2 ~ 10GHz.Utilize the electromagnetic parameter of gained to simulate the absorbing property of thickness for 1.6mm sample and the relation of frequency, result represents: Reflectionloss peak value appears at 8.94GHz ， Wei – 14.58dB.
Claims (1)
1. the preparation method of a scale-like nanocrystalline high temperature microwave absorbent, it is characterized in that: FeCo alloy pig is prepared in vacuum melting, FeCo alloy pig carries out inert gas aerosolization and obtains spherical FeCo powder, obtain flakey nano-crystalline Fe Co powder finally by mechanical ball milling, specifically comprise the following steps:
(1) vacuum melting: ingot iron, electrolytic cobalt are that 1:1 carries out vacuum induction melting and obtains FeCo alloy pig by Fe:Co atomic ratio;
(2) inert gas atomizer: FeCo alloy melting is warming up to 1600 DEG C ~ 1800 DEG C, adopts argon gas or nitrogen to carry out atomized producing ball-shaped FeCo powder;
(3) mechanical ball milling: spherical FeCo powder changes flakey nano-crystalline Fe Co powder into through mechanical ball milling, ratio of grinding media to material is 5:1 ~ 20:1, ball-milling medium is absolute ethyl alcohol, acetone or gasoline, surfactant is stearic acid, stearic addition is 0.5% ~ 5.0% of spherical FeCo powder quality, and Ball-milling Time is 1 ~ 12h;
Wherein, prepared FeCo powder is flakey manocrystalline powders, can be used for the absorbing material of room temperature ~ 600 DEG C, 2 ~ 10GHz.
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| CN104226980B (en) * | 2014-07-29 | 2016-06-15 | 中国科学院重庆绿色智能技术研究院 | The method strengthening metal powder material laser energy absorption efficiency |
| CN105344436B (en) | 2015-03-09 | 2017-11-21 | 中南大学 | A kind of method for eliminating the hollow defect of atomized alloy powder |
| CN104858441B (en) * | 2015-05-20 | 2017-02-22 | 北京康普锡威科技有限公司 | Preparing method for fine sheet metal magnetically soft alloy powder |
| CN107737917B (en) * | 2017-09-27 | 2019-08-16 | 西安理工大学 | A kind of preparation method of sheet suede structure magnetism microwave absorption |
| CN113369481B (en) * | 2020-03-10 | 2022-11-04 | 武汉理工大学 | High-temperature-resistant oxidation flaky nanocrystalline microwave absorbent and preparation method thereof |
| CN113820034B (en) * | 2020-12-11 | 2023-09-29 | 中冶长天国际工程有限责任公司 | Online temperature measurement method in microwave field |
| CN115537684B (en) * | 2021-11-11 | 2024-04-12 | 泉州天智合金材料科技有限公司 | Novel iron-based amorphous nanocrystalline wave-absorbing material and preparation method thereof |
| CN115651477A (en) * | 2022-11-07 | 2023-01-31 | 北京环境特性研究所 | High-temperature-resistant wave-absorbing coating and preparation method thereof |
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| JP2004140322A (en) * | 2002-08-20 | 2004-05-13 | Alps Electric Co Ltd | Electric wave absorber and manufacturing method of the same |
| CN101328534A (en) * | 2008-07-24 | 2008-12-24 | 中南大学 | Method for preparing sheet-like nanocrystalline Fe-based alloy microwave absorbing agent |
| CN102214509B (en) * | 2010-04-12 | 2013-03-20 | 北京有色金属研究总院 | (FeCo)N microwave absorbing material and preparation method thereof |
| CN101864272B (en) * | 2010-05-21 | 2013-03-13 | 南京工业大学 | Microwave absorbent and electromagnetic shielding material and preparation method thereof |
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