CN113059834A - Preparation method of pearl shell-imitated electromagnetic wave absorption film - Google Patents

Preparation method of pearl shell-imitated electromagnetic wave absorption film Download PDF

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CN113059834A
CN113059834A CN202110290247.1A CN202110290247A CN113059834A CN 113059834 A CN113059834 A CN 113059834A CN 202110290247 A CN202110290247 A CN 202110290247A CN 113059834 A CN113059834 A CN 113059834A
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silicon
iron
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CN113059834B (en
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张雪峰
陈新宇
李逸兴
张政宇
孙卓
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Northeastern University China
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/50—Treatment of iron or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/82—After-treatment

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  • Soft Magnetic Materials (AREA)
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Abstract

The invention belongs to the field of anti-electromagnetic interference, and provides a preparation method of a pearl shell-imitated electromagnetic wave absorption film, which comprises the following steps: step 1, performing wet ball milling on the iron-silicon-aluminum alloy powder to obtain sheet iron-silicon-aluminum alloy powder, taking out, airing and storing. And 2, mixing the flaky ferrosilicon aluminum powder obtained in the step 1 with a nitric acid solution. And 3, taking out the passivated iron-silicon-aluminum powder reacted in the step 2, cleaning and drying the iron-silicon-aluminum powder, and placing the iron-silicon-aluminum powder into a tubular furnace for high-temperature treatment. And 4, mixing the ferrosilicon aluminum powder obtained in the step 3 with NMP (N-methylpyrrolidone) and PVDF (polyvinylidene fluoride) to prepare a composite glue solution. And 5, coating the composite glue solution by using a coating machine to form a film, and curing. The preparation process is simple, the chemical method is adopted for preparation, and the industrial production cost is low. And the prepared excess material is less, and the environmental pollution is less.

Description

Preparation method of pearl shell-imitated electromagnetic wave absorption film
Technical Field
The invention belongs to the field of anti-electromagnetic interference, and provides a preparation method of a pearl shell-imitated electromagnetic wave absorption film.
Background
With the development of increasingly miniaturized electronic devices and the wide application of communication facilities in the industrial, commercial and military fields, a great deal of electromagnetic pollution brings troubles to the normal life of people, such as the most common electromagnetic radiation, electromagnetic interference and the like in life. The interference of electromagnetic waves to electronic components which normally work is more and more serious along with the miniaturization and the higher integration degree of electronic circuits and components. Therefore, the reliability of electronic and electrical products containing large scale integrated circuits is facing a serious challenge, so that it is a real need to provide a magnetic thin film with good shielding performance for effectively reducing the thickness of the electronic products.
Compared with spherical magnetic powder, the Fe-Si-Al flaky magnetic powder has larger length-diameter ratio, and the flat shape structure can generate larger shape anisotropy, so that the limitation of the Snoek limit of the traditional block material and spherical particle material on the magnetic conductivity and the resonance frequency theory is broken through, the high magnetic conductivity can be kept in a high-frequency range, and simultaneously, the low eddy current loss is realized, and the absorption of the material on high-frequency electromagnetic waves is facilitated. Therefore, the method is widely applied, but the problem that the impedance matching is influenced by the excessively high dielectric constant of the sheet iron-silicon-aluminum alloy micro powder exists all the time. The key to solving this problem is to make an insulating layer with small thickness, high resistivity and strong adhesion to the magnetic powder.
The pearl oyster belongs to a natural organic/inorganic layered multi-level structure composite material, and the organic/inorganic layered structure of the pearl oyster enables the structure to be beautiful and the mechanical property to be excellent. Meanwhile, when the flaky magnetic powder has the trend of consistent orientation, the advantages of the flaky magnetic powder can be exerted to the maximum extent. Therefore, the blade coating method is an effective processing technique. The specific process is to mix the absorbent and the binder in a solvent to form uniform and stable slurry. During molding, the slurry flows onto the release film, a wet film is formed through the relative movement of the release film and the scraper, and the thickness of the wet film can be controlled by the scraper. And drying the wet film to obtain a finished product.
At present, the preparation methods of the Fe-Si-Al magnetic film mostly have the defects of poor flexibility, poor impedance matching capability, insufficient high-frequency wave absorbing capability and the like. For example: the use of a method of directly mixing a binder with raw sendust powder is used in a bin (patent publication No. CN108092006B), and untreated sendust powder has low surface resistance and unsatisfactory impedance matching effect. Touguefu (patent No. CN103824672B) utilizes a silicon dioxide hardened network structure formed by dehydrating water glass to solidify a granular Fe-Si-Al wave absorber to form a film, but the length-diameter ratio of the wave absorber is low, so that the Snowski limit cannot be broken through, the high-frequency performance falls back, the flexibility of the film is not ideal, and the film is not beneficial to industrial application. The scheme performs pre-treatment on the wave absorbing agent, is favorable for improving the wave absorbing performance, has simple and convenient preparation process and is favorable for large-scale industrial production.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a preparation method of an imitated pearl shell electromagnetic wave absorption film.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of an electromagnetic wave absorption film imitating pearl oyster. The enhancement of the electromagnetic wave absorption performance is completed by the insulating coated flaky wave-absorbing powder arranged in a flaky shape. The coating process adopts a concentrated nitric acid in-situ passivation method, and uniform and complete coating modification of the iron-silicon-aluminum alloy flake micro powder can be realized by controlling process conditions. And then, the passivation film formed on the surface is more compact through high-temperature treatment. The treated flaky powder is mixed with a binder to prepare mixed slurry. And coating the slurry into a thin film by using a coating machine to obtain a wet film, and drying and curing to obtain the pearl shell-like electromagnetic wave absorption thin film. The preparation process has the advantages of mild conditions, convenient operation, high efficiency and industrialization realization. The method specifically comprises the following steps:
a preparation method of a pearl shell-like electromagnetic wave absorption film comprises the following steps:
step 1, ball milling of Fe-Si-Al alloy: weighing 200-mesh 300-mesh spherical iron-silicon-aluminum alloy powder (Fe85-Si9.6-Al5.4) and absolute ethyl alcohol according to the mass ratio of 2: 1-4, mixing, adding into a ball mill for ball milling, wherein the ball milling medium is steel balls with the diameter of 3-10mm, the ball material mass ratio is 15-25: 1, and ball milling is carried out for 2-24 h at the temperature of 200-mesh 300 r/min; drying and screening the slurry after the ball milling is finished, and removing the part with the particle size of less than 25 mu m to obtain the flaky iron-silicon-aluminum micro powder; the milling of the Fe-Si-Al powder is to increase the length-diameter ratio of the Fe-Si-Al powder and improve the wave-absorbing performance. The wet grinding method is adopted because the ferrosilicon aluminum alloy has high brittleness, and the alloy is easy to be crushed by dry grinding.
Preferably, the mass ratio of the spherical sendust (Fe85-Si9.6-Al5.4) alloy powder to the absolute ethyl alcohol is 1:1, the ball-milling medium is 5mm steel balls, the ball-material ratio is 20:1, and the flaky sendust powder is obtained by ball milling for 4 hours at 220 r/min.
Step 2, surface treatment: dispersing the flaky iron-silicon-aluminum micro powder obtained in the step 1 in HNO according to 0.1-0.5 g/ml3-ethanol solution, said HNO3-the ethanol solution mass concentration is 10-40 wt%, while maintaining uninterrupted mechanical stirring. The passivation time is 1-20 min; after the reaction is finished, filtering out the powder and drying; and forming a uniform and complete passivation film on the surface of the flaky iron-silicon-aluminum micro powder.
Preferably, the fine powder of flaky sendust is dispersed in HNO3-concentration in ethanol solution of 0.2g/ml, HNO3The mass concentration of the ethanol solution is 30 wt%, and the passivation time is 5 min.
Step 3, high-temperature annealing: annealing the powder subjected to surface treatment obtained in the step 2, putting the powder into a tube furnace, heating to 500-800 ℃ at the temperature rise rate of 6-10 ℃/min under the protective atmosphere of argon, preserving the heat for 30-120min, and cooling to room temperature under the protective atmosphere;
preferably, the heating rate is 8 ℃/min, the temperature is increased to 550 ℃, and the temperature is kept for 120 min.
Step 4, mixing glue solution: mixing the flaky powder obtained in the step (3) with NMP (N-methyl pyrrolidone) and PVDF (polyvinylidene fluoride) to prepare mixed slurry; the mixture ratio of the mixed slurry is 5-20: 20-80: 1 of iron-silicon-aluminum powder and PVDF; stirring in a stirrer with the rotating speed of 20-80 r/min for 20-60 min, and fully and uniformly mixing; carrying out negative pressure defoaming on the mixed slurry under the condition of 0.1 MPa;
the preferable result is that the proportion of the iron-silicon-aluminum powder to NMP to PVDF is 10:50:1, the rotating speed of the stirrer is 40r/min, the stirring time is 40min, and the negative pressure defoaming condition is 0.1 MPa.
Step 5, preparing a film: coating the obtained slurry into a film by using a coating machine, adjusting the height of a scraper to be 0.6-2 mm, and controlling the advancing speed of the scraper to be 1-4 cm/s; the drying and curing temperature of the wet film is 45-65 ℃, and the curing time is 4-8 h.
Preferably, the result is that the height of the scraper is 0.8mm, the advancing speed of the scraper is 1.5cm/s, the drying curing temperature is 55 ℃, and the curing time is 6h.
The invention has the beneficial effects that:
(1) the modified iron-silicon-aluminum alloy micro powder prepared by the method forms an insulating layer consisting of oxides on the surface, so that the resistivity is improved, and the impedance matching performance of the iron-silicon-aluminum alloy micro powder is improved.
(2) The modified iron-silicon-aluminum alloy micro powder prepared by the method has the advantages that the surface oxide layer is generated in situ, the connection with the alloy surface is tight, and the powder is not easy to fall off.
(3) The flaky magnetic powder has the trend of consistent orientation, and the advantages of the flaky magnetic powder are exerted to the maximum extent. So that the electromagnetic wave absorption performance is enhanced to the maximum extent.
(4) The organic/inorganic layered multi-level structure composite material imitating pearl shells is adopted, so that the film has a regular structure and excellent mechanical properties.
Description of the drawings:
FIG. 1 is an SEM image of passivated sendust powder of example 1.
FIG. 2 is an SEM image of passivated sendust powder of example 2.
FIG. 3 is a SEM image of a cross section of a thin film in example 1.
FIG. 4 is an SEM image of the surface of the thin film of example 1.
FIG. 5 shows (a) transmission coefficient and (b) reflection coefficient of examples 1, 2, 3 and comparative example 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the operation of the present invention is provided with reference to the accompanying drawings and specific examples. It should be understood that the specific examples described herein are for purposes of illustration only and are not intended to limit the scope of the present disclosure.
Example 1:
a preparation method of a pearl shell-like electromagnetic wave absorption film comprises the following steps:
s1, ball milling of iron-silicon-aluminum alloy
Weighing 200-mesh 300-mesh spherical Fe-Si-Al alloy powder and absolute ethyl alcohol according to the mass ratio of 1:1, adding the powder into a ball mill for ball milling, wherein the ball milling medium is steel balls with the diameter of 5mm, the ball-material ratio is 20:1, and ball milling is carried out for 4 hours at the speed of 220 r/min. And after the ball milling is finished, drying the slurry, screening and removing the part with the particle size of less than 25 mu m.
S2, surface treatment
Dispersing the flaky iron-silicon-aluminum micro powder obtained in the step 1 in HNO according to 0.2g/ml3-ethanol solution, said HNO3-ethanol solution mass concentration of 30 wt%, during which uninterrupted mechanical stirring is maintained. The passivation time was 5 min. After the reaction is finished, filtering out the powder and drying.
S3, high-temperature annealing
And (3) annealing the surface-treated powder obtained in the second step, putting the powder into a tube furnace, heating to 550 ℃ at the temperature rising rate of 8 ℃/min under the protective atmosphere of argon, preserving the heat for 120min, and cooling to room temperature under the protective atmosphere.
S4, mixing glue solution
40g of the flake powder obtained in the third step was mixed with 200g of NMP and 4g of PVDF to prepare a mixed slurry. Stirring in a stirrer at 40r/min for 40min, and mixing. And (3) carrying out negative pressure defoaming on the mixed slurry under the condition of 0.1 MPa.
S5, preparing a film
Coating the obtained slurry into a film, adjusting the height of a scraper to be 0.8mm, controlling the advancing speed of the scraper to be 1.5cm/s to obtain a wet film, and drying and curing for 6h at 55 ℃.
Measuring electromagnetic parameters of the film, and measuring reflection coefficient S11The highest is-11.9 dB, and the lowest is-13.9 dB; coefficient of transmission S21The highest is-19.4 dB, and the lowest is-22.9 dB.
Example 2:
a preparation method of a pearl shell-like electromagnetic wave absorption film comprises the following steps:
s1, ball milling of iron-silicon-aluminum alloy
Weighing 200-mesh 300-mesh spherical Fe-Si-Al alloy powder and absolute ethyl alcohol according to the mass ratio of 1:2, adding the powder into a ball mill for ball milling, wherein the ball milling medium is steel balls with the diameter of 7mm, the ball material ratio is 15:1, carrying out ball milling for 10h at 200r/min, drying the slurry after the ball milling is finished, and screening to remove the part with the particle size of less than 25 mu m.
S2, surface treatment
Dispersing the flaky iron-silicon-aluminum micro powder obtained in the step 1 in HNO according to 0.2g/ml3-ethanol solution, said HNO3The ethanol solution mass concentration was 40 wt%, during which mechanical stirring was maintained without interruption. The passivation time was 8 min. After the reaction is finished, filtering out the powder and drying.
S3, high-temperature annealing
And (3) annealing the surface-treated powder obtained in the second step, putting the powder into a tube furnace, heating to 600 ℃ at the temperature rising rate of 6 ℃/min under the protective atmosphere of argon, preserving the heat for 100min, and cooling to room temperature under the protective atmosphere.
S4, mixing glue solution
40g of the flake powder obtained in the third step was mixed with 200g of NMP and 5g of PVDF to prepare a mixed slurry. Stirring in a stirrer at 50r/min for 60min, and mixing. And (3) carrying out negative pressure defoaming on the mixed slurry under the condition of 0.1 MPa.
S5, preparing a film
Coating the obtained slurry into a film, adjusting the height of a scraper to be 1.2mm, controlling the advancing speed of the scraper to be 2cm/s to obtain a wet film, and drying and curing at 45 ℃ for 8 h.
Measuring electromagnetic parameters of the film, and measuring reflection coefficient S11The highest is-10.0 dB, and the lowest is-12.1 dB; coefficient of transmission S21The highest is-9.5 dB and the lowest is-15.3 dB.
Example 3:
a preparation method of a pearl shell-like electromagnetic wave absorption film comprises the following steps:
s1, ball milling of iron-silicon-aluminum alloy
Weighing 200-mesh 300-mesh spherical Fe-Si-Al alloy powder and absolute ethyl alcohol according to the mass ratio of 1:3, adding the powder into a ball mill for ball milling, wherein the ball milling medium is steel balls with the diameter of 3mm, the ball material ratio is 25:1, carrying out ball milling for 6h at 300r/min, drying the slurry after the ball milling is finished, and screening to remove the part with the particle size of less than 25 mu m.
S2, surface treatment
Dispersing the flaky iron-silicon-aluminum micro powder obtained in the step 1 in HNO according to 0.4g/ml3-ethanol solution, said HNO3-the ethanol solution mass concentration is 25 wt%, during which uninterrupted mechanical stirring is maintained. The passivation time was 10 min. After the reaction is finished, filtering out the powder and drying.
S3, high-temperature annealing
And (3) annealing the surface-treated powder obtained in the second step, putting the powder into a tube furnace, heating to 650 ℃ at the temperature rising rate of 10 ℃/min under the protective atmosphere of argon, preserving the heat for 80min, and cooling to room temperature under the protective atmosphere.
S4, mixing glue solution
40g of the flake powder obtained in the third step was mixed with 200g of NMP and 8g of PVDF to prepare a mixed slurry. Stirring in a stirrer at 60r/min for 50min, and mixing. And (3) carrying out negative pressure defoaming on the mixed slurry under the condition of 0.1 MPa.
S5, preparing a film
Coating the obtained slurry into a film, adjusting the height of a scraper to be 1mm, controlling the advancing speed of the scraper to be 4cm/s to obtain a wet film, and drying and curing for 4h at 65 ℃.
Measuring electromagnetic parameters of the film, and measuring reflection coefficient S11The highest is-8.3 dB, and the lowest is-10.0 dB; coefficient of transmission S21The highest is-9.9 dB and the lowest is-12.6 dB.
Comparative example 1
The comparative example of example 1 differs from example 1 in that HNO is used3-ethanol solution mass concentration 5 wt%.
The film of comparative example 1 was subjected to electromagnetic parameter measurement and reflection coefficient S11The highest is-2.3 dB, and the lowest is-3.6 dB; coefficient of transmission S21The highest is-9.8 dB and the lowest is-12.5 dB. Compared with comparative example 1, example 1 has stronger absorption capacity to electromagnetic waves, and can well absorb the electromagnetic waves into the absorption chamberThe wave is internally and lossy.

Claims (7)

1. A preparation method of a pearl shell-like electromagnetic wave absorption film is characterized by comprising the following steps: the method comprises the following steps:
step 1, ball milling of Fe-Si-Al alloy: weighing 200-mesh 300-mesh spherical iron-silicon-aluminum alloy powder and absolute ethyl alcohol according to the mass ratio of 2: 1-4, mixing, adding into a ball mill for ball milling, wherein the ball milling medium is steel balls with the diameter of 3-10mm, the mass ratio of ball materials is 15-25: 1, and ball milling is carried out for 2-24 hours at the temperature of 200-mesh 300 r/min; drying and screening the slurry after the ball milling is finished, and removing the part with the particle size of less than 25 mu m to obtain the flaky iron-silicon-aluminum micro powder;
step 2, surface treatment: dispersing the flaky iron-silicon-aluminum micro powder obtained in the step 1 in HNO according to 0.1-0.5 g/ml3-ethanol solution, said HNO3-the ethanol solution mass concentration is 10-40 wt%, while maintaining uninterrupted mechanical stirring; the passivation time is 1-20 min; after the reaction is finished, filtering out the powder and drying; forming a uniform and complete passivation film on the surface of the flaky iron-silicon-aluminum micro powder;
step 3, high-temperature annealing: annealing the powder subjected to surface treatment obtained in the step 2, putting the powder into a tube furnace, heating to 500-800 ℃ at the temperature rise rate of 6-10 ℃/min under the protective atmosphere of argon, preserving the heat for 30-120min, and cooling to room temperature under the protective atmosphere;
step 4, mixing glue solution: mixing the flaky powder obtained in the step 3 with NMP and PVDF to prepare mixed slurry; the mixture ratio of the mixed slurry is 5-20: 20-80: 1 of iron-silicon-aluminum powder and PVDF; stirring in a stirrer with the rotating speed of 20-80 r/min for 20-60 min, and fully and uniformly mixing; carrying out negative pressure defoaming on the mixed slurry under the condition of 0.1 MPa;
step 5, preparing a film: coating the obtained slurry into a film by using a coating machine, adjusting the height of a scraper to be 0.6-2 mm, and controlling the advancing speed of the scraper to be 1-4 cm/s; the drying and curing temperature of the wet film is 45-65 ℃, and the curing time is 4-8 h.
2. The method for preparing an electromagnetic wave absorption film imitating pearl oyster according to claim 1, wherein the mass fraction of each component in the spherical iron-silicon-aluminum alloy powder is Fe 85-Si9.6-Al5.4.
3. The method for preparing the nacre-imitated electromagnetic wave absorption film as claimed in claim 1, wherein the mass ratio of the spherical ferrosilicon-aluminum alloy powder to the absolute ethyl alcohol in the step 1 is 1:1, the ball milling medium is 5mm steel balls, the mass ratio of the ball materials is 20:1, and the flaky ferrosilicon-aluminum micro powder is obtained by ball milling for 4 hours at 220 r/min.
4. The method for preparing the nacre-imitated electromagnetic wave absorption film according to claim 1, wherein the concentration of the flaky sendust powder dispersed in the HNO 3-ethanol solution in the step 2 is 0.2g/ml, the mass concentration of the HNO 3-ethanol solution is 30 wt%, and the passivation time is 5 min.
5. The method for preparing an electromagnetic wave absorption film imitating pearl oyster according to claim 1, wherein in the step 3, the temperature rise rate is 8 ℃/min, the temperature is increased to 550 ℃, and the temperature is maintained for 120 min.
6. The method for preparing the nacre-imitated electromagnetic wave absorption film as claimed in claim 1, wherein the ratio of the sendust powder to the NMP to the PVDF in the step 4 is 10:50:1, the rotation speed of the stirrer is 40r/min, the stirring time is 40min, and the negative pressure defoaming condition is 0.1 MPa.
7. The method for preparing an electromagnetic wave absorption film imitating pearl oyster according to claim 1, wherein in the step 5, the height of a scraper is 0.8mm, the advancing speed of the scraper is 1.5cm/s, the drying and curing temperature is 55 ℃, and the curing time is 6h.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114230422A (en) * 2022-01-11 2022-03-25 中国工程物理研究院化工材料研究所 Pearl shell interface structure-imitated reinforced PBX compound and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN106531391A (en) * 2015-09-10 2017-03-22 介面光电股份有限公司 Soft magnetic powder composition and manufacturing method for magnetic element
CN107414089A (en) * 2017-07-20 2017-12-01 上海交通大学 A kind of Fe-Si-Al magnetic and preparation method thereof
CN108092006A (en) * 2016-11-23 2018-05-29 南京冠旭新材料科技有限公司 Stratiform wideband radar inhales wave plate and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106531391A (en) * 2015-09-10 2017-03-22 介面光电股份有限公司 Soft magnetic powder composition and manufacturing method for magnetic element
CN108092006A (en) * 2016-11-23 2018-05-29 南京冠旭新材料科技有限公司 Stratiform wideband radar inhales wave plate and preparation method thereof
CN107414089A (en) * 2017-07-20 2017-12-01 上海交通大学 A kind of Fe-Si-Al magnetic and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114230422A (en) * 2022-01-11 2022-03-25 中国工程物理研究院化工材料研究所 Pearl shell interface structure-imitated reinforced PBX compound and preparation method thereof

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