CN115321926A - High-temperature-resistant cement-based wave-absorbing material for high-power microwave darkroom and preparation method thereof - Google Patents
High-temperature-resistant cement-based wave-absorbing material for high-power microwave darkroom and preparation method thereof Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 93
- 239000011358 absorbing material Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 150000004645 aluminates Chemical class 0.000 claims abstract description 59
- 239000006260 foam Substances 0.000 claims abstract description 33
- 239000004005 microsphere Substances 0.000 claims abstract description 31
- 239000002002 slurry Substances 0.000 claims description 46
- 238000002156 mixing Methods 0.000 claims description 19
- 238000001035 drying Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000012467 final product Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 12
- 229910018072 Al 2 O 3 Inorganic materials 0.000 abstract description 8
- 239000000945 filler Substances 0.000 abstract description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 abstract description 3
- 239000008204 material by function Substances 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 238000003756 stirring Methods 0.000 description 12
- 238000007790 scraping Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 238000005187 foaming Methods 0.000 description 5
- 239000004088 foaming agent Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000011398 Portland cement Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
- C04B38/106—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam by adding preformed foams
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00258—Electromagnetic wave absorbing or shielding materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention relates to the technical field of wave-absorbing functional materials, in particular to a high-temperature-resistant cement-based wave-absorbing material for a high-power microwave anechoic chamber and a preparation method thereof. The invention uses aluminate cement as matrix material, foam and/or Al 2 O 3 The hollow microspheres are used as wave-transparent filler; foam and Al 2 O 3 The addition of the hollow microspheres can improve the impedance matching of the cement-based material, so that more electromagnetic waves can be incident into the material, and the electromagnetic wave loss is increased; and Al 2 O 3 The introduction of the hollow microspheres can inhibit the shrinkage of cement and reduce the generation of shrinkage cracks, has good thermal conductivity, and can accelerate the heat dissipation under the condition of high powerAnd the internal and external temperatures of the pyramid material are reduced. The porous aluminate cement wave-absorbing material can resist the high temperature of 1000 ℃, has good wave-absorbing performance, can not burn at high temperature, can be used under the conditions of high power and high temperature, and has simple preparation method; has wide application prospect in a high-power microwave darkroom.
Description
Technical Field
The invention relates to the technical field of wave-absorbing functional materials, in particular to a high-temperature-resistant cement-based wave-absorbing material for a high-power microwave anechoic chamber and a preparation method thereof.
Background
In recent years, microwave darkrooms have attracted considerable attention due to the rapid development of stealth technology, electromagnetic technology, and communication technology. The wave-absorbing material used in the microwave dark room at present is mostly a technical route of polymer foam impregnated carbon powder or ferrite, and for the polymer foam, the rigidity of the polymer foam is low, so that the polymer foam is easy to bend and deform after being affected with damp, and the testing precision of a testing environment is seriously affected. Along with the increase of high-power test demand, the power density who bears on the ripples pyramid also is higher and higher, causes the pyramid temperature higher, and although the ignition point of polymer foam is lower, under high-power test condition, too high temperature still can make the polymer foam take place to burn, causes certain potential safety hazard.
The Chinese patent with the publication number of CN213991560U discloses a novel high-power wave-absorbing pyramid, the pyramid is provided with a hollow cavity, an internal pyramid is fixedly installed in the hollow cavity, the internal pyramid uses a honeycomb pyramid or a non-woven fabric pyramid, the absorption performance of the pyramid exceeds 4-8 dB of the prior art, however, the highest working temperature of the honeycomb and the non-woven fabric is only about 150 ℃, and the power capacity is less than 10kW/m 2 Therefore, under the condition of larger power capacity, the pyramid still has certain limitation. Chinese patent publication No. CN114315366a discloses a silicon carbide ceramic wave-absorbing pyramid based on 3D printing, which has good high temperature resistance, but requires a high temperature of more than 1000 ℃ for ceramic sintering, and the production cost of the pyramid is high. In order to reduce the cost of the pyramid, a Chinese patent with the publication number of CN113860812A discloses a wave-absorbing pyramid for a cement inorganic foam microwave darkroom, and the matrix of the wave-absorbing pyramid is made of ordinary portland cement, so that the production cost is greatly reduced. However, the working temperature of the Portland cement is less thanAt the temperature of 400 ℃, the material can crack, and the wave-absorbing pyramid fails, thereby further limiting the application of the wave-absorbing pyramid under the condition of high-power test. Therefore, the development of a high-temperature-resistant cement-based wave-absorbing material for a high-power microwave darkroom is urgent.
Disclosure of Invention
Aiming at the problems or the defects, the invention provides a high-temperature-resistant cement-based wave-absorbing material for a high-power microwave dark room and a preparation method thereof, aiming at solving the high-temperature-resistant problem of the wave-absorbing material for the high-power microwave dark room.
A high-temperature-resistant cement-based wave-absorbing material for a high-power microwave anechoic chamber is prepared by using Al with the particle size of 0.2-5 mm 2 O 3 Hollow microsphere and foam, and modified aluminate cement slurry with the water cement ratio of 0.15-0.5; wherein Al is 2 O 3 The volume ratio of the hollow microspheres to the foam is 0-50 vol%, the ratio of the foam can be 0 2 O 3 The proportion of the hollow microspheres is not 0.
The preparation method of the high-temperature-resistant cement-based wave-absorbing material for the high-power microwave anechoic chamber comprises the following steps:
step 1, preparing aluminate cement slurry with the water-cement ratio of 0.15-0.5.
Wherein said Al is 2 O 3 The grain diameter of the hollow microsphere is 0.2-5 mm, the proportion of the foam can be 0 2 O 3 The proportion of the hollow microspheres is not 0.
And 3, pouring the porous aluminate cement slurry obtained in the step 2 into a mould, curing and forming, and demoulding to obtain an initial blank.
And 4, completely drying the primary blank obtained in the step 3 to obtain the high-temperature-resistant cement-based wave-absorbing material (porous aluminate cement wave-absorbing material) for the high-power microwave darkroom.
Further, in the step 2, when the foam is generatedWhen the ratio is not 0, al is added first 2 O 3 After the hollow microspheres are uniformly mixed, foam is added for secondary uniform mixing, and aluminum oxide is prevented from occupying foam gaps, so that the performance of a final product is better.
Further, the drying of the primary blank in the step 4 is completely finished at least at 100 ℃ so as to improve the preparation efficiency.
Further, the mold in the step 3 is a flat mold, a solid pyramid mold or a hollow pyramid mold.
The invention uses aluminate cement as matrix material, foam and/or Al 2 O 3 The hollow microspheres are used as wave-transparent filler; foam and Al 2 O 3 The addition of the hollow microspheres can improve the impedance matching of the cement-based material, so that more electromagnetic waves can be incident into the material, and the electromagnetic wave loss is increased; and Al 2 O 3 The introduction of the hollow microspheres can inhibit the shrinkage of cement and reduce the generation of shrinkage cracks, and the hollow microspheres also have good thermal conductivity, can accelerate heat dissipation under the condition of high power and reduce the internal and external temperatures of the pyramid material. The porous aluminate cement wave-absorbing material can resist the high temperature of 1000 ℃, has good wave-absorbing performance, can not burn at high temperature, can be used under the conditions of high power and high temperature, and has simple preparation method; has wide application prospect in a high-power microwave darkroom.
Drawings
FIG. 1 is a graph of the wave-absorbing properties of the sample obtained in example 1 at 2-18 GHz.
FIG. 2 is a wave-absorbing performance diagram of the sample obtained in example 2 at 2-18 GHz.
FIG. 3 is a wave-absorbing performance diagram of the sample obtained in example 3 at 2-18 GHz.
FIG. 4 is a wave-absorbing performance diagram of the sample obtained in example 4 at 2-18 GHz.
FIG. 5 is a wave-absorbing performance diagram of the sample obtained in example 5 at 2-18 GHz.
FIG. 6 is a wave-absorbing performance diagram of the sample obtained in example 6 at 2-18 GHz.
FIG. 7 is a wave-absorbing property diagram of the sample obtained in example 7 at 2-18 GHz.
FIG. 8 is a wave-absorbing property diagram of the sample obtained in example 8 at 2-18 GHz.
FIG. 9 is a pictorial representation of a Portland cement after treatment at 400 ℃.
FIG. 10 is an image of a real object obtained by treating the real object at 1000 ℃ in example 6.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The detailed wave-absorbing performance results of the material are shown in tables 1-3. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Step 1, preparing aluminate cement slurry with a water-cement ratio of 0.5.
And 3, pouring the aluminate cement slurry prepared in the step 2 into a steel flat plate die with the length, width and height of 200 x 30mm, compacting and scraping, putting the die into a constant temperature and humidity box with the temperature of 20 ℃ and the humidity of more than 90%, curing for 6 hours, demoulding, and putting the die into a water culture box with the temperature of 20 ℃ for water culture for 3 days.
And 4, drying the sample obtained in the step 3 at 105 ℃ for 10 hours to obtain the aluminate cement-based flat wave-absorbing material.
Example 2
Step 1, preparing aluminate cement slurry with a water-cement ratio of 0.45.
And 3, preparing a concrete foaming agent solution with the weight percent of 3, foaming in a bubbler, adding 10vol% of foam into the aluminate cement slurry prepared in the step 2, and slowly stirring for 30 seconds to uniformly mix to obtain the porous aluminate cement slurry.
And 3, pouring the porous aluminate cement slurry obtained in the step 2 into a steel flat plate mold with the length, width and height of 200 x 30mm, compacting and scraping, putting the steel flat plate mold into a constant-temperature and constant-humidity box with the temperature of 20 ℃ and the humidity of more than 90%, curing for 6 hours, demolding, and putting the molded box into a water-curing box with the temperature of 20 ℃ for water curing for 3 days.
And 4, drying the sample obtained in the step 3 at 105 ℃ for 10 hours to obtain the high-temperature-resistant aluminate cement-based flat wave-absorbing material for the high-power microwave darkroom.
Example 3
Step 1, preparing aluminate cement slurry with a water-cement ratio of 0.35.
And 3, preparing a concrete foaming agent solution with the weight percent of 3, foaming in a bubbler, adding 20vol% of foam into the aluminate cement slurry prepared in the step 1, and slowly stirring for 50s to uniformly mix to obtain the porous aluminate cement slurry.
And 4, pouring the porous aluminate cement slurry obtained in the step 2 into a steel flat plate mold with the length, width and height of 200 x 30mm, compacting and scraping, putting the steel flat plate mold into a constant-temperature and constant-humidity box with the temperature of 20 ℃ and the humidity of more than 90%, curing for 6 hours, demolding, and putting the molded box into a water-curing box with the temperature of 20 ℃ for water curing for 3 days.
And 5, drying the sample obtained in the step 3 at 105 ℃ for 15 hours to obtain the high-temperature-resistant aluminate cement-based flat wave-absorbing material for the high-power microwave darkroom.
Example 4
Step 1, preparing aluminate cement slurry with a water-cement ratio of 0.25.
And 3, preparing a concrete foaming agent solution with the weight percent of 3, foaming in a bubbler, adding 40vol% of foam into the aluminate cement slurry prepared in the step 1, and slowly stirring for 60 seconds to uniformly mix to obtain the porous aluminate cement slurry.
And 4, pouring the slurry obtained in the step 2 into a steel flat plate mold with the length, width and height of 200 x 30mm, compacting and scraping, putting the steel flat plate mold into a constant-temperature and constant-humidity box with the temperature of 20 ℃ and the humidity of more than 90%, curing for 6 hours, demolding, and putting the steel flat plate mold into a water-curing box with the temperature of 20 ℃ for water curing for 3 days after demolding.
And 5, drying the sample obtained in the step 3 at 105 ℃ for 15 hours to obtain the high-temperature-resistant aluminate cement-based flat wave-absorbing material for the high-power microwave darkroom.
Example 5
Step 1, preparing aluminate cement slurry with a water-cement ratio of 0.15.
And 3, preparing a 3wt% concrete foaming agent solution, foaming in a bubbler, adding 45vol% foam into the aluminate cement slurry prepared in the step 1, and slowly stirring for 35s to uniformly mix to obtain the porous aluminate cement slurry.
And 4, pouring the porous aluminate cement slurry obtained in the step 2 into a steel flat plate mold with the length, width and height of 200 x 30mm, compacting and scraping, putting the steel flat plate mold into a constant-temperature and constant-humidity box with the temperature of 20 ℃ and the humidity of more than 90%, curing for 6 hours, demolding, and putting the molded box into a water-curing box with the temperature of 20 ℃ for water curing for 3 days.
And 5, drying the sample obtained in the step 3 at 105 ℃ for 24 hours to obtain the high-temperature-resistant aluminate cement-based flat wave-absorbing material for the high-power microwave darkroom.
Example 6
Step 1, preparing aluminate cement slurry with a water-cement ratio of 0.5.
And 3, pouring the porous aluminate cement slurry obtained in the step 2 into a steel flat plate mold with the length, width and height of 200 x 30mm, compacting and scraping, putting the steel flat plate mold into a constant-temperature and constant-humidity box with the temperature of 20 ℃ and the humidity of more than 90%, curing for 6 hours, demolding, and putting the molded box into a water-curing box with the temperature of 20 ℃ for water curing for 3 days.
And 4, drying the sample obtained in the step 3 at 105 ℃ for 24 hours to obtain the high-temperature-resistant aluminate cement-based flat wave-absorbing material for the high-power microwave darkroom.
Example 7
Step 1, preparing aluminate cement slurry with a water-cement ratio of 0.5.
And 3, pouring the porous aluminate cement slurry obtained in the step 2 into a steel flat plate mold with the length, width and height of 200 x 30mm, compacting and scraping, putting the steel flat plate mold into a constant-temperature and constant-humidity box with the temperature of 20 ℃ and the humidity of more than 90%, curing for 6 hours, demolding, and putting the molded box into a water-curing box with the temperature of 20 ℃ for water curing for 3 days.
And 4, drying the sample obtained in the step 3 at 105 ℃ for 24 hours to obtain the high-temperature-resistant aluminate cement-based flat wave-absorbing material for the high-power microwave darkroom.
Example 8
Step 1, preparing aluminate cement slurry with a water-cement ratio of 0.45.
And 3, preparing a concrete foaming agent solution with the weight percent of 3, foaming in a bubbler, adding 20vol% of foam into the aluminate cement slurry prepared in the step 1, and slowly stirring for 40 seconds to uniformly mix to obtain the porous aluminate cement slurry.
And 4, pouring the slurry obtained in the step 2 into a 60 x 150mm pyramid mold, compacting and scraping, putting into a constant-temperature constant-humidity box with the temperature of 20 ℃ and the humidity of more than 90%, curing for 6 hours, demolding, and putting into a water curing box with the temperature of 20 ℃ for water curing for 3 days after demolding.
And 5, drying the sample obtained in the step 3 at 105 ℃ for 10 hours to obtain the high-temperature-resistant aluminate cement-based pyramid wave-absorbing material for the high-power microwave darkroom.
Table 1 shows the results of the performance test without high temperature treatment of the samples obtained in examples 1 to 8
Table 2 shows the results of the performance tests of the samples obtained in examples 1 to 3 and 6 to 7 after treatment at 500 ℃:
table 3 shows the results of the performance tests of the samples obtained in examples 6 to 7 after treatment at 1000 ℃:
as can be seen from the above examples, the present invention uses aluminate cement as the base material of the pyramid, foam and/or Al 2 O 3 The hollow microspheres are used as wave-transparent filler, and the addition of the foam and the hollow spheres can improve the impedance matching of the cement-based material, so that more electromagnetic waves can be incident into the material, and the electromagnetic wave loss is increased; and Al 2 O 3 The introduction of the hollow microspheres can inhibit the shrinkage of cement and reduce the generation of shrinkage cracks, has good thermal conductivity, can accelerate heat dissipation under the condition of high power, and reduces the internal and external temperatures of the pyramid material. The porous aluminate cement wave-absorbing material can resist the high temperature of 1000 ℃, has good wave-absorbing performance, can not burn at high temperature, can be used under the conditions of high power and high temperature, and has simple preparation method.
Claims (5)
1. The high-temperature-resistant cement-based wave-absorbing material for the high-power microwave anechoic chamber is characterized in that: al with the grain diameter of 0.2-5 mm is adopted 2 O 3 Hollow microsphere and foam, modified water cement ratio of 0.15-0.5; wherein Al is 2 O 3 The volume ratio of the hollow microspheres to the foam is 0vol% -50 vol%, the ratio of the foam can be 0 2 O 3 The proportion of the hollow microspheres is not 0.
2. The preparation method of the high-temperature-resistant cement-based wave-absorbing material for the high-power anechoic chamber according to claim 1, which comprises the following steps:
step 1, preparing aluminate cement slurry with a water-cement ratio of 0.15-0.5;
step 2, adding foam and Al with the volume ratio of 0vol% -50 vol% into the aluminate cement slurry prepared in the step 1 2 O 3 Mixing the hollow microspheres uniformly to obtain porous aluminate cement slurry; wherein said Al is 2 O 3 The grain diameter of the hollow microspheres is 0.2-5 mm, the proportion of the foam can be 0 2 O 3 The proportion of the hollow microspheres is not 0;
step 3, pouring the porous aluminate cement slurry obtained in the step 2 into a mould, curing and forming, and demoulding to obtain a primary blank;
and 4, completely drying the primary blank obtained in the step 3 to obtain the high-temperature-resistant cement-based wave-absorbing material for the high-power microwave darkroom.
3. The preparation method of the high-temperature-resistant cement-based wave-absorbing material for the high-power anechoic chamber as claimed in claim 2, wherein the preparation method comprises the following steps:
in the step 2, when the proportion of the foam is not 0, al is added firstly 2 O 3 After the hollow microspheres are uniformly mixed, adding foam for secondary mixing to prevent the alumina from occupying the foamAnd the voids enable the final product to have better performance.
4. The preparation method of the high-temperature-resistant cement-based wave-absorbing material for the high-power anechoic chamber as claimed in claim 2, wherein the preparation method comprises the following steps: and in the step 4, the drying of the primary blank is completely finished at least at 100 ℃, so that the preparation efficiency is improved.
5. The preparation method of the high-temperature-resistant cement-based wave-absorbing material for the high-power anechoic chamber according to claim 2, which is characterized by comprising the following steps: the die in the step 3 is a flat die, a solid pyramid die or a hollow pyramid die.
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Application publication date: 20221111 |