CN115365488A - High-performance high-temperature-resistant electromagnetic loss material and preparation method thereof - Google Patents
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- 239000000463 material Substances 0.000 title claims abstract description 87
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- 239000002002 slurry Substances 0.000 claims abstract description 41
- 229920005989 resin Polymers 0.000 claims abstract description 34
- 239000011347 resin Substances 0.000 claims abstract description 34
- XQUPVDVFXZDTLT-UHFFFAOYSA-N 1-[4-[[4-(2,5-dioxopyrrol-1-yl)phenyl]methyl]phenyl]pyrrole-2,5-dione Chemical class O=C1C=CC(=O)N1C(C=C1)=CC=C1CC1=CC=C(N2C(C=CC2=O)=O)C=C1 XQUPVDVFXZDTLT-UHFFFAOYSA-N 0.000 claims abstract description 32
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 31
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- XEVZIAVUCQDJFL-UHFFFAOYSA-N [Cr].[Fe].[Si] Chemical compound [Cr].[Fe].[Si] XEVZIAVUCQDJFL-UHFFFAOYSA-N 0.000 claims abstract description 30
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 22
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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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
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Abstract
The invention discloses a high-performance high-temperature-resistant electromagnetic loss material and a preparation method thereof, belonging to the field of resin-based electromagnetic loss composite materials. The preparation process comprises the following steps: weighing flaky iron-silicon-chromium powder FeSiCr, modified bismaleimide resin and fumed silica, and uniformly mixing to obtain mixed electromagnetic slurry; placing the electromagnetic paste in a forming mould, and placing the electromagnetic paste in a vacuum oven for defoaming treatment; and curing the electromagnetic paste obtained by defoaming in a forming die to obtain the high-performance high-temperature-resistant electromagnetic loss material.
Description
Technical Field
The invention relates to a high-performance high-temperature-resistant electromagnetic loss material and a preparation method thereof, belonging to the field of resin-based electromagnetic loss composite materials.
Background
With the rapid development of weaponry, the stealth performance of airplanes, ships and guided missiles is urgently needed to be further improved. Radar cross-sectional area (RCS) is generally used to characterize stealth performance, and the smaller the RCS in the radar detection range, the better the stealth performance. To reduce RCS, this is usually achieved by a combination of contour and material stealth. However, the design of the invisible appearance is limited by the pneumatic layout, and the omnibearing invisible is difficult to realize. Therefore, the research and development of the high-performance stealth wave-absorbing material have important significance for reducing RCS and improving stealth capability.
Carbonyl iron powder is a common absorbent for preparing wave-absorbing materials, has the characteristics of industrial maturity, high magnetic conductivity, high magnetic loss and strong wave-absorbing capacity compared with other magnetic loss absorbents, and is widely applied to the field of electromagnetic wave absorption. However, carbonyl iron powder generally has a small size and a large specific surface area, so that it is easily oxidized at high temperature, loses its original electromagnetic properties, and cannot meet the use requirements of some high-temperature working conditions. On the other hand, iron is an active metal, and the iron has a large specific surface area and is easily contacted with water vapor in the air, so that the iron is poor in environmental tolerance and is easily corroded in a humid environment, and the material fails.
The existing electromagnetic loss material mostly uses carbonyl iron powder as an absorbent, and on one hand, the carbonyl iron powder has a small size and a large specific surface area, so that the carbonyl iron powder has poor oxidation resistance at a high temperature (more than or equal to 200 ℃), is easily oxidized, causes the dielectric constant and the magnetic conductivity to fluctuate greatly, loses the original electromagnetic property, and cannot meet the use requirements of some high-temperature working conditions. On the other hand, iron is an active metal, and the iron has a large specific surface area and is easily contacted with water vapor in the air, so that the iron is poor in environmental tolerance and is easily corroded in a humid environment, and the material fails. In addition, in the prior art, the high-temperature electromagnetic loss resistant material is prepared based on materials such as graphite, silicon carbide and the like, so that impedance mismatch is easily caused, and the loss performance is low. The existing electromagnetic loss material also uses ferrosilicon chromium alloy powder as an absorbent, for example, patents CN105895290 and CN111360245A all adopt conventional ferrosilicon chromium alloy powder as a raw material, and the conventional ferrosilicon chromium alloy powder has a block or spherical shape, and the performance of the ferrosilicon chromium alloy powder cannot be fully exerted due to the influence of the conventional shapes, so that the performance of the electromagnetic loss material is limited. Accordingly, a preparation method of a high-performance high-temperature-resistant electromagnetic loss material is urgently needed to be developed, the performance of the iron-silicon-chromium alloy powder is fully exploited, and the prepared electromagnetic loss material has high loss performance and oxidation resistance at high temperature, and has important significance for widening the use temperature and application field of the electromagnetic loss material.
Disclosure of Invention
The invention aims to provide a high-performance high-temperature-resistant electromagnetic loss material and a preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a high-performance high-temperature-resistant electromagnetic loss material comprises the following steps:
weighing flaky iron-silicon-chromium powder FeSiCr, modified bismaleimide resin and fumed silica, and uniformly mixing to obtain mixed electromagnetic slurry;
placing the electromagnetic slurry in a forming mold, and placing the electromagnetic slurry in a vacuum oven for defoaming treatment;
and curing the electromagnetic paste obtained by defoaming in a forming die to obtain the high-performance high-temperature-resistant electromagnetic loss material.
Furthermore, the particle size of the iron-silicon-chromium powder is 2-15 μm.
Further, the addition amount of the iron-silicon-chromium powder is 80-90% of the total weight of the iron-silicon-chromium powder and the modified bismaleimide resin.
Further, the addition amount of the fumed silica is 0.3% -1% of the total weight of the iron-silicon-chromium powder and the modified bismaleimide resin.
Further, the iron-silicon-chromium powder, the modified bismaleimide resin and the fumed silica are placed in a planetary gravity mixer for uniform mixing.
Furthermore, the rotating speed of the planetary gravity mixer is 600-800r/min, and the time is 4-6min.
Furthermore, the temperature of the vacuum oven is 100-120 ℃, and the vacuum degree is-0.1 MPa.
A high-performance high-temperature-resistant electromagnetic loss material is prepared by the method.
The FeSiCr used as the raw material is alloy micro powder, has high magnetic conductivity, magnetic conductivity loss, strong oxidation resistance and corrosion resistance, and can keep good electromagnetic performance at higher temperature. The method particularly adopts the flaky FeSiCr, because the flaky FeSiCr micro powder has stronger shape anisotropy and can ensure a higher magnetocrystalline anisotropy equivalent field, thereby breaking through the Snoek limit of the traditional block material and spherical particles, being beneficial to improving the microwave permeability and natural resonance frequency and improving the wave-absorbing performance of the material. The glass transition temperature of the modified bismaleimide resin reaches more than 300 ℃, and the high-temperature use requirement of the material can be met. The fumed silica used in the invention has the properties of sedimentation, thickening, toughening and the like; meanwhile, the powder dispersion is facilitated, and the impedance matching is improved.
Drawings
FIG. 1 is an SEM photograph of flaky FeSiCr powder in example 1;
fig. 2 is a sample object diagram of the electromagnetic loss material prepared based on the ferrochrome powder in example 1.
Fig. 3 is an SEM image of the electromagnetic loss material prepared based on the ferrochrome powder in example 1.
Detailed Description
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
The following are 6 examples and 2 comparative examples, wherein the examples adopt a preparation method of the high-performance and high-temperature resistant electromagnetic loss material proposed by the invention to prepare the electromagnetic loss material, and the comparative examples adopt other preparation methods to prepare the electromagnetic loss material, and the two methods are mainly different in that iron-silicon-chromium powder is used in the former raw material, and carbonyl iron powder is used in the latter raw material, and the specific contents are as follows.
Example 1
A preparation method of a high-performance high-temperature-resistant electromagnetic loss material comprises the following specific steps:
the method comprises the following steps: weighing 800g of flake iron-silicon-chromium powder (shown in figure 1) with the particle size of 2 mu m, 200g of modified bismaleimide resin and 3g of fumed silica in a planetary gravity mixer;
step two: setting the rotating speed of the planetary gravity mixer to be 600r/min and the time to be 6min, and uniformly mixing the three raw materials;
step three: placing the mixed electromagnetic slurry obtained in the step two into a forming mold, placing the electromagnetic slurry into a vacuum oven, and carrying out defoaming treatment at the temperature of 100 ℃ and the vacuum degree of-0.1 MPa;
step four: and (4) placing the electromagnetic slurry obtained in the step (three) into a forming die for curing and forming to obtain the high-performance high-temperature-resistant electromagnetic loss material (as shown in figures 2-3).
The electromagnetic loss material prepared in the embodiment is added with waveguide samples of S wave band and Ku wave band according to a standard machine, and electromagnetic parameters of the waveguide samples are measured by a vector grid analyzer to obtain complex dielectric constants epsilon ', epsilon' and magnetic conductivities mu 'and mu'.
Example 2
A preparation method of a high-performance high-temperature-resistant electromagnetic loss material comprises the following specific steps:
the method comprises the following steps: weighing 800g of sheet iron-silicon-chromium powder with the particle size of 15 mu m, 200g of modified bismaleimide resin and 3g of fumed silica, and placing the powder, the modified bismaleimide resin and the fumed silica in a planetary gravity mixer;
step two: setting the rotating speed of the planetary gravity mixer to be 600r/min and the time to be 6min, and uniformly mixing the three raw materials;
step three: placing the electromagnetic slurry obtained in the step two after mixing in a forming die, placing in a vacuum oven, and carrying out defoaming treatment at the temperature of 100 ℃ and the vacuum degree of-0.1 MPa;
step four: and (4) placing the electromagnetic slurry obtained in the step three into a forming die for curing and forming to obtain the high-performance high-temperature-resistant electromagnetic loss material.
The electromagnetic loss material prepared in the embodiment is added with waveguide samples of S wave band and Ku wave band according to a standard machine, and electromagnetic parameters of the waveguide samples are measured by a vector grid analyzer to obtain complex dielectric constants epsilon ', epsilon' and magnetic conductivities mu 'and mu'.
Example 3
A preparation method of a high-performance high-temperature-resistant electromagnetic loss material comprises the following specific steps:
the method comprises the following steps: weighing 800g of sheet iron-silicon-chromium powder with the particle size of 8 mu m, 200g of modified bismaleimide resin and 3g of fumed silica, and placing the powder in a planetary gravity mixer;
step two: setting the rotating speed of the planetary gravity mixer to be 600r/min and the time to be 6min, and uniformly mixing the three raw materials;
step three: placing the electromagnetic slurry obtained in the step two after mixing in a forming die, placing in a vacuum oven, and carrying out defoaming treatment at the temperature of 100 ℃ and the vacuum degree of-0.1 MPa;
step four: and (4) placing the electromagnetic slurry obtained in the step three into a forming die for curing and forming to obtain the high-performance high-temperature-resistant electromagnetic loss material.
The electromagnetic loss material prepared in the embodiment is added with waveguide samples of S wave band and Ku wave band according to a standard machine, and electromagnetic parameters of the waveguide samples are measured by a vector grid analyzer to obtain complex dielectric constants epsilon ' and magnetic conductivities mu ' and mu '.
Example 4
A preparation method of a high-performance high-temperature-resistant electromagnetic loss material comprises the following specific steps:
the method comprises the following steps: weighing 900g of sheet iron-silicon-chromium powder with the particle size of 2 mu m, 100g of modified bismaleimide resin and 3g of fumed silica, and placing the powder, the modified bismaleimide resin and the fumed silica in a planetary gravity mixer;
step two: setting the rotating speed of the planetary gravity mixer to be 600r/min and the time to be 6min, and uniformly mixing the three raw materials;
step three: placing the electromagnetic slurry obtained in the step two after mixing in a forming die, placing in a vacuum oven, and carrying out defoaming treatment at the temperature of 100 ℃ and the vacuum degree of-0.1 MPa;
step four: and (4) placing the electromagnetic slurry obtained in the step three into a forming die for curing and forming to obtain the high-performance high-temperature-resistant electromagnetic loss material.
The electromagnetic loss material prepared in the embodiment is added with waveguide samples of S wave band and Ku wave band according to a standard machine, and electromagnetic parameters of the waveguide samples are measured by a vector grid analyzer to obtain complex dielectric constants epsilon ' and magnetic conductivities mu ' and mu '.
Example 5
A preparation method of a high-performance high-temperature-resistant electromagnetic loss material comprises the following specific steps:
the method comprises the following steps: 850g of flaky iron-silicon-chromium powder with the particle size of 2 mu m, 100g of modified bismaleimide resin and 3g of fumed silica are weighed and placed in a planetary gravity mixer;
step two: setting the rotating speed of the planetary gravity mixer to be 600r/min and the time to be 6min, and uniformly mixing the three raw materials;
step three: placing the mixed electromagnetic slurry obtained in the step two into a forming mold, placing the electromagnetic slurry into a vacuum oven, and carrying out defoaming treatment at the temperature of 100 ℃ and the vacuum degree of-0.1 MPa;
step four: and (4) placing the electromagnetic slurry obtained in the step three into a forming die for curing and forming to obtain the high-performance high-temperature-resistant electromagnetic loss material.
The electromagnetic loss material prepared in the embodiment is added with waveguide samples of S wave band and Ku wave band according to a standard machine, and electromagnetic parameters of the waveguide samples are measured by a vector grid analyzer to obtain complex dielectric constants epsilon ' and magnetic conductivities mu ' and mu '.
Example 6
A preparation method of a high-performance high-temperature-resistant electromagnetic loss material comprises the following specific steps:
the method comprises the following steps: weighing 800g of sheet iron-silicon-chromium powder with the particle size of 2 mu m, 200g of modified bismaleimide resin and 10g of fumed silica, and placing the powder, the modified bismaleimide resin and the fumed silica in a planetary gravity mixer;
step two: setting the rotating speed of the planetary gravity mixer to be 600r/min and the time to be 6min, and uniformly mixing the three raw materials;
step three: placing the mixed electromagnetic slurry obtained in the step two into a forming mold, placing the electromagnetic slurry into a vacuum oven, and carrying out defoaming treatment at the temperature of 100 ℃ and the vacuum degree of-0.1 MPa;
step four: and (4) placing the electromagnetic slurry obtained in the step three into a forming die for curing and forming to obtain the high-performance high-temperature-resistant electromagnetic loss material.
The electromagnetic loss material prepared in the embodiment is added with waveguide samples of S wave band and Ku wave band according to a standard machine, and electromagnetic parameters of the waveguide samples are measured by a vector grid analyzer to obtain complex dielectric constants epsilon ' and magnetic conductivities mu ' and mu '.
Example 7
A preparation method of a high-performance high-temperature-resistant electromagnetic loss material comprises the following specific steps:
the method comprises the following steps: weighing 800g of sheet iron-silicon-chromium powder with the particle size of 2 mu m, 200g of modified bismaleimide resin and 6g of fumed silica, and placing the powder, the modified bismaleimide resin and the fumed silica in a planetary gravity mixer;
step two: setting the rotating speed of the planetary gravity mixer to be 600r/min and the time to be 6min, and uniformly mixing the three raw materials;
step three: placing the electromagnetic slurry obtained in the step two after mixing in a forming die, placing in a vacuum oven, and carrying out defoaming treatment at the temperature of 100 ℃ and the vacuum degree of-0.1 MPa;
step four: and (4) placing the electromagnetic slurry obtained in the step three into a forming die for curing and forming to obtain the high-performance high-temperature-resistant electromagnetic loss material.
The electromagnetic loss material prepared in the embodiment is added with waveguide samples of S wave band and Ku wave band according to a standard machine, and electromagnetic parameters of the waveguide samples are measured by a vector grid analyzer to obtain complex dielectric constants epsilon ' and magnetic conductivities mu ' and mu '.
Example 8
A preparation method of a high-performance high-temperature-resistant electromagnetic loss material comprises the following specific steps:
the method comprises the following steps: weighing 800g of sheet iron-silicon-chromium powder with the particle size of 2 mu m, 200g of modified bismaleimide resin and 3g of fumed silica, and placing the powder, the modified bismaleimide resin and the fumed silica in a planetary gravity mixer;
step two: setting the rotating speed of the planetary gravity mixer to be 800r/min and the time to be 4min, and uniformly mixing the three raw materials;
step three: placing the mixed electromagnetic slurry obtained in the step two into a forming mold, placing the electromagnetic slurry into a vacuum oven, and carrying out defoaming treatment at the temperature of 110 ℃ and the vacuum degree of-0.1 MPa;
step four: and (4) placing the electromagnetic slurry obtained in the step three into a forming die for curing and forming to obtain the high-performance high-temperature-resistant electromagnetic loss material.
The electromagnetic loss material prepared in the embodiment is added with waveguide samples of S wave band and Ku wave band according to a standard machine, and electromagnetic parameters of the waveguide samples are measured by a vector grid analyzer to obtain complex dielectric constants epsilon ' and magnetic conductivities mu ' and mu '.
Example 9
A preparation method of a high-performance high-temperature-resistant electromagnetic loss material comprises the following specific steps:
the method comprises the following steps: weighing 800g of sheet iron-silicon-chromium powder with the particle size of 2 mu m, 200g of modified bismaleimide resin and 3g of fumed silica, and placing the powder, the modified bismaleimide resin and the fumed silica in a planetary gravity mixer;
step two: setting the rotating speed of the planetary gravity mixer to be 700r/min, setting the time to be 5min, and uniformly mixing the three raw materials;
step three: placing the mixed electromagnetic slurry obtained in the step two into a forming mold, placing the electromagnetic slurry into a vacuum oven, and carrying out defoaming treatment at the temperature of 120 ℃ and the vacuum degree of-0.1 MPa;
step four: and (4) placing the electromagnetic slurry obtained in the step three into a forming die for curing and forming to obtain the high-performance high-temperature-resistant electromagnetic loss material.
The electromagnetic loss material prepared in the embodiment is added with waveguide samples of S wave band and Ku wave band according to a standard machine, and electromagnetic parameters of the waveguide samples are measured by a vector grid analyzer to obtain complex dielectric constants epsilon ', epsilon' and magnetic conductivities mu 'and mu'.
Comparative example 1
A preparation method of a high-performance high-temperature-resistant electromagnetic loss material comprises the following specific steps:
the method comprises the following steps: weighing 800g of carbonyl iron powder with the particle size of 2 mu m, 200g of modified bismaleimide resin and 3g of fumed silica, and placing the materials in a planetary gravity mixer;
step two: setting the rotating speed of the planetary gravity mixer to be 600r/min and the time to be 6min, and uniformly mixing the three raw materials;
step three: placing the mixed electromagnetic slurry obtained in the step two into a forming mold, placing the electromagnetic slurry into a vacuum oven, and carrying out defoaming treatment at the temperature of 100 ℃ and the vacuum degree of-0.1 MPa;
step four: and (4) placing the electromagnetic slurry obtained in the step three into a forming die for curing and forming to obtain the electromagnetic loss material.
The electromagnetic loss material prepared by the comparative example is added into waveguide samples with S wave band and Ku wave band according to a standard machine, and electromagnetic parameters of the waveguide samples are measured by a vector grid analyzer to obtain complex dielectric constants epsilon ', epsilon' and magnetic conductivities mu 'and mu'.
Comparative example 2
A preparation method of a high-performance high-temperature-resistant electromagnetic loss material comprises the following specific steps:
the method comprises the following steps: weighing 700g of blocky iron-silicon-chromium powder with the particle size of 2 mu m, 300g of modified bismaleimide resin and 3g of fumed silica, and placing the powder, the modified bismaleimide resin and the fumed silica in a planetary gravity mixer;
step two: setting the rotating speed of the planetary gravity mixer to be 600r/min and the time to be 6min, and uniformly mixing the three raw materials;
step three: placing the mixed electromagnetic slurry obtained in the step two into a forming mold, placing the electromagnetic slurry into a vacuum oven, and carrying out defoaming treatment at the temperature of 100 ℃ and the vacuum degree of-0.1 MPa;
step four: and (4) placing the electromagnetic slurry obtained in the step three into a forming die for curing and forming to obtain the high-performance high-temperature-resistant electromagnetic loss material.
The electromagnetic loss material prepared by the comparative example is added into waveguide samples with S wave band and Ku wave band according to a standard machine, and electromagnetic parameters of the waveguide samples are measured by a vector grid analyzer to obtain complex dielectric constants epsilon ', epsilon' and magnetic conductivities mu 'and mu'.
Comparative example 3
A preparation method of a high-performance high-temperature-resistant electromagnetic loss material comprises the following specific steps:
the method comprises the following steps: weighing 800g of spherical iron-silicon-chromium powder with the particle size of 2 mu m, 200g of modified bismaleimide resin and 3g of fumed silica, and placing the powder, the modified bismaleimide resin and the fumed silica in a planetary gravity mixer;
step two: setting the rotating speed of the planetary gravity mixer to be 600r/min and the time to be 6min, and uniformly mixing the three raw materials;
step three: placing the electromagnetic slurry obtained in the step two after mixing in a forming die, placing in a vacuum oven, and carrying out defoaming treatment at the temperature of 100 ℃ and the vacuum degree of-0.1 MPa;
step four: and (4) placing the electromagnetic slurry obtained in the step three into a forming die for curing and forming to obtain the high-performance high-temperature-resistant electromagnetic loss material.
The electromagnetic loss material prepared by the comparative example is added into waveguide samples with S wave band and Ku wave band according to a standard machine, and the electromagnetic parameters are measured by a vector grid analyzer to obtain complex dielectric constants epsilon ', epsilon' and magnetic conductivities mu 'and mu'.
Comparative example 4
A preparation method of a high-performance high-temperature-resistant electromagnetic loss material comprises the following specific steps:
the method comprises the following steps: weighing 800g of blocky iron-silicon-chromium powder with the particle size of 2 mu m, 200g of modified bismaleimide resin and 3g of fumed silica, and placing the blocky iron-silicon-chromium powder, the modified bismaleimide resin and the fumed silica in a planetary gravity mixer;
step two: setting the rotating speed of the planetary gravity mixer to be 600r/min and the time to be 6min, and uniformly mixing the three raw materials;
step three: placing the mixed electromagnetic slurry obtained in the step two into a forming mold, placing the electromagnetic slurry into a vacuum oven, and carrying out defoaming treatment at the temperature of 100 ℃ and the vacuum degree of-0.1 MPa;
step four: and (4) placing the electromagnetic slurry obtained in the step three into a forming die for curing and forming to obtain the high-performance high-temperature-resistant electromagnetic loss material.
The electromagnetic loss material prepared by the comparative example is added into waveguide samples with S wave band and Ku wave band according to a standard machine, and electromagnetic parameters of the waveguide samples are measured by a vector grid analyzer to obtain complex dielectric constants epsilon ', epsilon' and magnetic conductivities mu 'and mu'.
The test results of the electromagnetic lossy materials prepared in the above examples and comparative examples are shown in the following tables 1 to 2, where table 1 is typical frequency point electromagnetic parameters of high and low frequencies of the electromagnetic lossy material, table 2 is electromagnetic parameters after high temperature treatment of the electromagnetic lossy material prepared based on iron-silicon-chromium powder and based on carbonyl iron powder, where complex dielectric constants epsilon ', epsilon' and magnetic conductivities mu ', mu' are main parameters characterizing the performance of the electromagnetic lossy material, epsilon 'is real part of the dielectric constant, epsilon' is imaginary part of the dielectric constant, mu 'is real part of the magnetic conductivity, and mu' is imaginary part of the magnetic conductivity.
TABLE 1 electromagnetic loss Material high and low frequency typical frequency point electromagnetic parameters
As can be seen from Table 1, in examples 1 to 9, the low-frequency electromagnetic attenuation coefficients and the high-frequency electromagnetic attenuation coefficients of the prepared electromagnetic materials are all above 20dB/cm and above 90dB/cm due to the fact that the flaky iron-silicon-chromium powder is adopted in the raw materials, and the electromagnetic materials have good broadband high-loss performance. The embodiment 4 has the optimal high and low frequency electromagnetic attenuation performance, and the main reason is that the highest filling amount (90%) is selected in the range of 80% -90% of the sheet iron-silicon-chromium powder, and the inventor researches and discovers that the higher the filling amount in the range is, the higher the dielectric constant and the magnetic permeability of the material are, so that the material has a higher attenuation coefficient, and the impedance matching of the material is effectively realized by adding the fumed silica for dielectric regulation, so that the electromagnetic loss performance of the material is optimal.
TABLE 2 electromagnetic parameters after high temperature treatment of electromagnetic loss materials prepared based on iron-silicon-chromium powder and based on carbonyl iron powder
From table 2, it can be known that, as the material processing temperature increases, the electromagnetic parameters and the attenuation performance of the electromagnetic material prepared based on the iron-silicon-chromium powder basically remain unchanged, while the electromagnetic parameters of the electromagnetic material prepared based on the carbonyl iron powder greatly fluctuate with the temperature increase, and the result directly shows that the electromagnetic material prepared by the invention has excellent high temperature resistance and can meet the use requirements of high temperature working conditions.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A preparation method of a high-performance high-temperature-resistant electromagnetic loss material is characterized by comprising the following steps:
weighing flaky iron-silicon-chromium powder FeSiCr, modified bismaleimide resin and fumed silica, and uniformly mixing to obtain mixed electromagnetic slurry;
placing the electromagnetic slurry in a forming mold, and placing the electromagnetic slurry in a vacuum oven for defoaming treatment;
and curing the electromagnetic paste obtained by defoaming in a forming die to obtain the high-performance high-temperature-resistant electromagnetic loss material.
2. The method of claim 1, wherein the ferro-silicon-chromium powder has a particle size of 2 to 15 μm.
3. The method of claim 1, wherein the addition amount of the FeSiCr powder is 80-90% of the total weight of the FeSiCr powder and the modified bismaleimide resin.
4. The method of claim 1, wherein the fumed silica is added in an amount of 0.3% -1% of the total weight of the iron silicon chromium powder and the modified bismaleimide resin.
5. The method of claim 1, wherein the iron silicon chromium powder, the modified bismaleimide resin and the fumed silica are uniformly mixed in a planetary gravity mixer.
6. The method as claimed in claim 5, wherein the planetary gravity mixer is operated at a speed of 600-800r/min for a period of 4-6min.
7. The method of claim 1, wherein the vacuum oven temperature is 100-120 ℃ and the vacuum is-0.1 MPa.
8. A high performance high temperature resistant electromagnetic loss material prepared by the method of any one of claims 1 to 7.
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