CN108966619A - A kind of high-performance environment-friendly wave-absorber and preparation method thereof for electromagnetic compatible dark chamber - Google Patents
A kind of high-performance environment-friendly wave-absorber and preparation method thereof for electromagnetic compatible dark chamber Download PDFInfo
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- CN108966619A CN108966619A CN201810597637.1A CN201810597637A CN108966619A CN 108966619 A CN108966619 A CN 108966619A CN 201810597637 A CN201810597637 A CN 201810597637A CN 108966619 A CN108966619 A CN 108966619A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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Abstract
The present invention relates to absorbing material fields, more specifically, are related to a kind of high-performance environment-friendly wave-absorber and preparation method thereof for electromagnetic compatible dark chamber.The present invention is using cheap, the polycarbonate of industrial-scale production, expanded graphite, carbonyl iron dust etc. is raw material, it is designed by impedance discontinuities grading structure, housing bottom coats carbonyl iron coating, the expanded graphite of different size is layered filling, it is filled with the process flows such as protective gas enclosed package, give full play of the high-efficiency electromagnetic wave-absorbing property of expanded graphite and carbonyl iron dust, not including in raw material and preparation process has volatility, irritation and the chemical component that air is polluted, the wave-absorber prepared has lightweight, environmental protection, the characteristic of efficient absorption electromagnetic wave, the current electromagnetic compatible dark chamber deficiency used for inhaling wave foam can be made up.
Description
Technical field
The present invention relates to absorbing material fields, more specifically, are related to a kind of high-performance ring for electromagnetic compatible dark chamber
Protect wave-absorber and preparation method thereof.
Background technique
Current electronic class, the Electro Magnetic Compatibility of electrical category product referred highly important height.Electromagnetism is simultaneous
The accuracy and reliability for holding EMC test method and test result, directly influences the qualified or not of enterprise product.Due to
The presence of electromagnetic background noise and all kinds of electromagnetic disturbances, so that finding an ideal open area test site carries out electromagnetic compatibility survey
It tries very difficult.Electromagnetic compatible dark chamber is one of research EMC and the raising essential most important scientific method of EMC technology.
Electromagnetic compatible dark chamber can be used to replace open test site, carry out radiation-emitting and radiation immunity experiment to test equipment.
Electromagnetic compatible dark chamber is made of in structure screened room and absorbing material two parts, and screened room can separate extraneous
Electromagnetic disturbance signal, and leaking for indoor test signal can be inhibited, play two-way shielding action.Absorbing material should reach effective
It reduces and shields indoor standing wave, it is necessary to which the ELECTROMAGNETIC REFLECTION for reducing shielding chamber surface can just accurately measure electromagnetic radiation in this way
Size.The absorbing material that current existing electromagnetic compatible dark chamber uses is collectively constituted by ferrite and foam wave-suction material, this
Good mainly in conjunction with ferrite sheet low frequency performance, occupied space advantage small in size and suction wave foam are suitable for frequency electromagnetic waves
The characteristics of absorbing (high-end reachable 40GHz).Therefore it in electromagnetic compatible dark chamber when building, usually attaches and contains on ferrite sheet surface
Carbon foam realizes the efficient absorption in wide frequency range to electromagnetic wave by composite construction.
It is mainly the non-structural type polyurethane foam for impregnating electrocondution slurry that wave foam is inhaled used in electromagnetic compatible dark chamber.
Due to polyurethane foam it is heat-resisting, environment resistant it is poor, rigidity is low, it is difficult to competent long-time service demand in use can
There is bending deformation, especially regional in south China, air humidity is big, its own porous structure but will absorb large quantity of moisture,
Suction wave foam is caused to be chronically at dampness, carbon dust obscission is serious, and absorbing property is remarkably decreased；Wave foam is inhaled simultaneously to exist
During impregnating electrocondution slurry, adsorption conductive black while, can also adhere to a large amount of volatile harmful solvents, use
Cheng Zhong, hazardous solvent can gradually be evaporate into inside electromagnetic compatible dark chamber, polluted environment, endangered staff's health.
In inhaling wave foam long-term R & D production process, constituent parts are formulated by change, different densities are made in adjustment raw material,
The suction wave froth pulp of hardness, heat resistance, flame retardant property.But since the absorbing property for inhaling wave foam is with its porous structure
Based on, while needing to realize that foam surface adheres to electrocondution slurry by dipping organic ink technique, therefore inhale wave foam absorbing
Moisture, absorbing property are remarkably decreased and can not also solve the problems such as the release of pernicious gas in use process.
Demand present invention is generally directed to places such as electromagnetic compatible dark chambers to wideband wave absorbing material is prepared in a kind of wide-band
The strong absorption-type wave-absorber of electromagnetic wave solves traditional electromagnetic compatible dark chamber and inhales for electromagnetic wave absorbing layer in electromagnetic compatible dark chamber
Wave foam there are the problem of, in the band limits reflectivity < -10dB of 2 ~ 40GHz, have it is small in size, do not lose powder, odorlessness, ring
The features such as border is adaptable, preparation process is simple, production cost is low.
Summary of the invention
In the presence of overcoming the shortcomings of the prior art, the present invention provides a kind of high-performance for electromagnetic compatible dark chamber
Environmentally friendly wave-absorber solves existing suction wave foam and is easy to absorb moisture, performance decline seriously, release irritative gas, pollution environment
The problem of.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is as follows:
A kind of high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber, including polycarbonate shell, carbonyl iron dust/polyurethane are molten
Liquid and expanded graphite are sequentially filled carbonyl iron dust/polyurethane solutions coating, expansion stone from bottom to up in polycarbonate shell
Ink, polycarbonate film, expanded graphite, polycarbonate film, expanded graphite and polycarbonate film.
Polyurethane solutions preparation is added by carbonyl iron dust in the carbonyl iron dust/polyurethane solutions.
A kind of preparation method of the high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber, comprising the following steps:
S1, the polycarbonate shell processed is successively used to acetone, ethyl alcohol, deionized water ultrasonic cleaning, drying at room temperature；
S2, carbonyl iron dust addition polyurethane solutions are prepared into carbonyl iron dust/polyurethane solutions, by carbonyl iron dust/polyurethane solutions
Vacuum is carried out in drier takes out bubble processing；
S3, by carbonyl iron dust/polyurethane solutions in S2 down to S1 middle-high density polycarbonate shell bottom, with coating device by carbonyl
Iron powder/polyurethane solutions are applied as film-form, and coating carbonyl iron dust/polyurethane solutions polycarbonate shell is placed on room temperature item
It is spontaneously dried under part；
S4, expanded graphite is carried out in dry environment to the screen to filtrate, removes mixed impurity in expanded graphite preparation process
Grain and unpuffed powdered graphite, are sealed packaging, use for subsequent handling；
S5, S3 is completely dried after coating carbonyl iron dust/polyurethane solutions polycarbonate shell successively fill different size
Expanded graphite prepare wave-absorber semi-finished product by polycarbonate film interval between different size expanded graphite；
S6, the wave-absorber semi-finished product that S5 is prepared are put into heating furnace, are slowly heated to 75-85 DEG C, persistently keep the temperature 30-60min,
It is cooled to room temperature in dry environment, the hydrone of expanded graphite adsorption is desorbed by heating, avoids in subsequent use
Expanded graphite absorbing property declines in the process；
S7, the wave-absorber into S6 by drying process are slowly filled with protective gas argon gas, since argon gas density is noticeably greater than sky
Gas, argon gas can gradually filled polycarbonate enclosure interior, air is discharged, avoids inhaling inside wave-absorber in the long-term use
Wave component reacts with oxygen, reduces absorbing property；
S8, the wave-absorber that S7 completion protective gas is filled with is subjected to heating enclosed package, finally coats and protects in wave-absorber outer wall
Paint or gum, are packaged after to be dried, are placed at room temperature, complete the preparation of entire wave-absorber.
The polycarbonate shell is produced and processed according to the size of electromagnetic compatible dark chamber absorbing material.
The polycarbonate thickness of shell control is in 0.5mm.
The carbonyl iron dust and polyurethane mass ratio are 1:2 ~ 1:4.
Plastics thickness control is between 50-100 microns in the S3.
The filling thickness of every layer of expanded graphite is 9.5mm in the S5.
Expanded graphite layer is set as three layers in the S5, and each layer parameter is as follows:
Bottom layer, containing carbon mass fraction be 96-99%, partial size is 80 mesh, volume expansion multiple is 100-150 times；
Middle part layer, containing carbon mass fraction be 93-95%, partial size is 80 mesh, volume expansion multiple is 200-300 times；
Upper layer, containing carbon mass fraction be 85-92%, partial size is 80 mesh, volume expansion multiple is 350-500 times.
Heating furnace heating rate is 2 DEG C/min in the S6.
Compared with prior art, the advantageous effect of present invention is that:
The present invention uses cheap, industrial-scale production polycarbonate, expanded graphite, carbonyl iron dust etc. for former material
Material, using polycarbonate as wave-absorber load-carrying covering, mechanical strength is high, adverse environment resistant is strong, significantly improves wave-absorber
Mechanics bearing capacity and deformation resistance solve traditional flexible foam with the increase of use time, and moisture absorption and deformation occurs, inhales
The problem of wave performance declines；Inside wave-absorber based on multilayer impedance gradual design theory, using expanded graphite, carbonyl iron dust
As wave component is inhaled, it ensure that wave-absorber in wide frequency range to the efficient absorption of electromagnetic wave；By being carried out to wave-absorber inside
Protective gas encapsulating avoids the oxidation deactivation of wave absorbing agent；Polycarbonate is stablized as wave-absorber external shell material properties, solution
The problem of existing suction wave foam of having determined is deformed as caused by the porous structure moisture absorption and performance declines；Entire wave-absorber is all made of nothing
The tasteless raw material of poison, avoid the pollution to dark room air；It is expected to fundamentally solve current darkroom suction wave foam presence
The easy moisture absorption, performance decline, pollution air the problems such as, the wave-absorber prepared has lightweight, environmental protection, efficient absorption electromagnetic wave
Characteristic, lay the foundation to build higher-quality electromagnetic compatible dark chamber from now on.
Detailed description of the invention
Fig. 1 is a kind of high-performance environment-friendly wave-absorber structural schematic diagram for electromagnetic compatible dark chamber provided by the invention；
Fig. 2 is the expanded graphite microstructure schematic diagram that the present invention uses；
Fig. 3 is the reflection of electromagnetic wave rate test result figure of 2 sample of the embodiment of the present invention.
In Fig. 1: 1 being polycarbonate shell, 2 be the expanded graphite of different parameters, 3 be carbonyl iron dust coating.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figs. 1-2, a kind of high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber, including polycarbonate shell,
Carbonyl iron dust/polyurethane solutions and expanded graphite are sequentially filled carbonyl iron dust/polyurethane from bottom to up in polycarbonate shell
Solution coatings, expanded graphite, polycarbonate film, expanded graphite, polycarbonate film, expanded graphite and polycarbonate film.
Polyurethane solutions preparation is added by carbonyl iron dust in the carbonyl iron dust/polyurethane solutions.
Embodiment 1:
A kind of preparation method of the high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber, comprising the following steps:
S1,180mm × 180mm × 30mm polycarbonate shell is produced and processed according to the size of electromagnetic compatible dark chamber absorbing material
Body, thickness of shell control successively use acetone, ethyl alcohol, deionized water ultrasound clear in 0.5mm, by the polycarbonate shell processed
It washes, drying at room temperature；
S2, carbonyl iron dust addition polyurethane solutions are prepared into carbonyl iron dust/polyurethane solutions, the carbonyl iron dust and polyurethane matter
Carbonyl iron dust/polyurethane solutions are carried out vacuum in drier and take out bubble processing by amount than being 1:4；
S3, by carbonyl iron dust/polyurethane solutions in S2 down to S1 middle-high density polycarbonate shell bottom, with coating device by carbonyl
Iron powder/polyurethane solutions are applied as film-form, and plastics thickness control will coat carbonyl iron dust/poly- ammonia between 50-100 microns
The polycarbonate shell of ester solution is placed on to be spontaneously dried under room temperature；
S4, by expanded graphite, the screen to filtrate carries out removal of impurities cleaning in dry environment, is sealed packaging, makes for subsequent handling
With；
S5, S3 is completely dried after coating carbonyl iron dust/polyurethane solutions polycarbonate shell successively fill different size
Expanded graphite, the filling thickness of every layer of expanded graphite is 9.5mm, by between polycarbonate film between different size expanded graphite
Every preparing wave-absorber semi-finished product；
S6, the wave-absorber semi-finished product that S5 is prepared are put into heating furnace, heating furnace heating rate is 2 DEG C/min, is slowly heated to
85 DEG C, 30min is persistently kept the temperature, is cooled to room temperature in dry environment；
It slowly is filled with protective gas argon gas inside S7, the wave-absorber into S6 by drying process, air is discharged；
S8, the wave-absorber that S7 completion protective gas is filled with is subjected to heating enclosed package, finally coats and protects in wave-absorber outer wall
Paint or gum, are packaged after to be dried, are placed at room temperature, complete the preparation of entire wave-absorber.
In the present embodiment, expanded graphite layer is set as three layers in the S5, and each layer parameter is as follows:
Bottom layer, containing carbon mass fraction be 97%, partial size is 80 mesh, volume expansion multiple is 125 times；
Middle part layer, containing carbon mass fraction be 95%, partial size is 80 mesh, volume expansion multiple is 300 times；
Upper layer, containing carbon mass fraction be 92%, partial size is 80 mesh, volume expansion multiple is 500 times.
Embodiment 2:
A kind of preparation method of the high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber, comprising the following steps:
S1,300mm × 300mm × 30mm polycarbonate shell is produced and processed according to the size of electromagnetic compatible dark chamber absorbing material
Body, thickness of shell control successively use acetone, ethyl alcohol, deionized water ultrasound clear in 0.5mm, by the polycarbonate shell processed
It washes, drying at room temperature；
S2, carbonyl iron dust addition polyurethane solutions are prepared into carbonyl iron dust/polyurethane solutions, the carbonyl iron dust and polyurethane matter
Carbonyl iron dust/polyurethane solutions are carried out vacuum in drier and take out bubble processing by amount than being 1:3；
S3, by carbonyl iron dust/polyurethane solutions in S2 down to S1 middle-high density polycarbonate shell bottom, with coating device by carbonyl
Iron powder/polyurethane solutions are applied as film-form, and plastics thickness control will coat carbonyl iron dust/poly- ammonia between 50-100 microns
The polycarbonate shell of ester solution is placed on to be spontaneously dried under room temperature；
S4, by expanded graphite, the screen to filtrate carries out removal of impurities cleaning in dry environment, is sealed packaging, makes for subsequent handling
With；
S5, S3 is completely dried after coating carbonyl iron dust/polyurethane solutions polycarbonate shell successively fill different size
Expanded graphite, the filling thickness of every layer of expanded graphite is 9.5mm, by between polycarbonate film between different size expanded graphite
Every preparing wave-absorber semi-finished product；
S6, the wave-absorber semi-finished product that S5 is prepared are put into heating furnace, heating furnace heating rate is 2 DEG C/min, is slowly heated to
80 DEG C, 45min is persistently kept the temperature, is cooled to room temperature in dry environment；
It slowly is filled with protective gas argon gas inside S7, the wave-absorber into S6 by drying process, air is discharged；
S8, the wave-absorber that S7 completion protective gas is filled with is subjected to heating enclosed package, finally coats and protects in wave-absorber outer wall
Paint or gum, are packaged after to be dried, are placed at room temperature, complete the preparation of entire wave-absorber.
In the present embodiment, expanded graphite layer is set as three layers in the S5, and each layer parameter is as follows:
Bottom layer, containing carbon mass fraction be 99%, partial size is 80 mesh, volume expansion multiple is 150 times；
Middle part layer, containing carbon mass fraction be 93%, partial size is 80 mesh, volume expansion multiple is 250 times；
Upper layer, containing carbon mass fraction be 85%, partial size is 80 mesh, volume expansion multiple is 350 times.
Fig. 3 is wave-absorber reflection of electromagnetic wave rate test result figure manufactured in the present embodiment.
Embodiment 3:
A kind of preparation method of the high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber, comprising the following steps:
S1,500mm × 500mm × 30mm polycarbonate shell is produced and processed according to the size of electromagnetic compatible dark chamber absorbing material
Body, thickness of shell control successively use acetone, ethyl alcohol, deionized water ultrasound clear in 0.5mm, by the polycarbonate shell processed
It washes, drying at room temperature；
S2, carbonyl iron dust addition polyurethane solutions are prepared into carbonyl iron dust/polyurethane solutions, the carbonyl iron dust and polyurethane matter
Carbonyl iron dust/polyurethane solutions are carried out vacuum in drier and take out bubble processing by amount than being 1:2；
S3, by carbonyl iron dust/polyurethane solutions in S2 down to S1 middle-high density polycarbonate shell bottom, with coating device by carbonyl
Iron powder/polyurethane solutions are applied as film-form, and plastics thickness control will coat carbonyl iron dust/poly- ammonia between 50-100 microns
The polycarbonate shell of ester solution is placed on to be spontaneously dried under room temperature；
S4, by expanded graphite, the screen to filtrate carries out removal of impurities cleaning in dry environment, is sealed packaging, makes for subsequent handling
With；
S5, S3 is completely dried after coating carbonyl iron dust/polyurethane solutions polycarbonate shell successively fill different size
Expanded graphite, the filling thickness of every layer of expanded graphite is 9.5mm, by between polycarbonate film between different size expanded graphite
Every preparing wave-absorber semi-finished product；
S6, the wave-absorber semi-finished product that S5 is prepared are put into heating furnace, heating furnace heating rate is 2 DEG C/min, is slowly heated to
75 DEG C, 60min is persistently kept the temperature, is cooled to room temperature in dry environment；
It slowly is filled with protective gas argon gas inside S7, the wave-absorber into S6 by drying process, air is discharged；
S8, the wave-absorber that S7 completion protective gas is filled with is subjected to heating enclosed package, finally coats and protects in wave-absorber outer wall
Paint or gum, are packaged after to be dried, are placed at room temperature, complete the preparation of entire wave-absorber.
In the present embodiment, expanded graphite layer is set as three layers in the S5, and each layer parameter is as follows:
Bottom layer, containing carbon mass fraction be 96%, partial size is 80 mesh, volume expansion multiple is 100 times；
Middle part layer, containing carbon mass fraction be 94%, partial size is 80 mesh, volume expansion multiple is 200 times；
Upper layer, containing carbon mass fraction be 90%, partial size is 80 mesh, volume expansion multiple is 450 times.
Only presently preferred embodiments of the present invention is explained in detail above, but the present invention is not limited to above-described embodiment,
Within the knowledge of a person skilled in the art, it can also make without departing from the purpose of the present invention each
Kind variation, various change should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber, it is characterised in that: including polycarbonate shell, carbonyl
Iron powder/polyurethane solutions and expanded graphite are sequentially filled carbonyl iron dust/polyurethane solutions from bottom to up in polycarbonate shell
Coating, expanded graphite, polycarbonate film, expanded graphite, polycarbonate film, expanded graphite and polycarbonate film.
2. a kind of high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber according to claim 1, it is characterised in that: institute
It states carbonyl iron dust/polyurethane solutions and polyurethane solutions preparation is added by carbonyl iron dust.
3. a kind of preparation method of the high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber, which is characterized in that including following step
It is rapid:
S1, the polycarbonate shell processed is successively used to acetone, ethyl alcohol, deionized water ultrasonic cleaning, drying at room temperature；
S2, carbonyl iron dust addition polyurethane solutions are prepared into carbonyl iron dust/polyurethane solutions, by carbonyl iron dust/polyurethane solutions
Vacuum is carried out in drier takes out bubble processing；
S3, by carbonyl iron dust/polyurethane solutions in S2 down to S1 middle-high density polycarbonate shell bottom, with coating device by carbonyl
Iron powder/polyurethane solutions are applied as film-form, and coating carbonyl iron dust/polyurethane solutions polycarbonate shell is placed on room temperature item
It is spontaneously dried under part；
S4, expanded graphite is subjected in dry environment the screen to filtrate, is sealed packaging, used for subsequent handling；
S5, S3 is completely dried after coating carbonyl iron dust/polyurethane solutions polycarbonate shell successively fill different size
Expanded graphite prepare wave-absorber semi-finished product by polycarbonate film interval between different size expanded graphite；
S6, the wave-absorber semi-finished product that S5 is prepared are put into heating furnace, are slowly heated to 75-85 DEG C, persistently keep the temperature 30-60min,
It is cooled to room temperature in dry environment；
S7, the wave-absorber into S6 by drying process are slowly filled with protective gas argon gas, and air is discharged；
S8, the wave-absorber that S7 completion protective gas is filled with is subjected to heating enclosed package, finally coats and protects in wave-absorber outer wall
Paint or gum, are packaged after to be dried, are placed at room temperature, complete the preparation of entire wave-absorber.
4. a kind of preparation method of high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber according to claim 3,
Be characterized in that: the polycarbonate shell is produced and processed according to the size of electromagnetic compatible dark chamber absorbing material.
5. a kind of preparation method of high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber according to claim 3,
Be characterized in that: the polycarbonate thickness of shell is 0.5mm.
6. a kind of preparation method of high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber according to claim 3,
Be characterized in that: the carbonyl iron dust is 1:2 ~ 1:4 with polyurethane mass ratio.
7. a kind of preparation method of high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber according to claim 3,
Be characterized in that: film thickness is 50-100 microns in the S3.
8. a kind of preparation method of high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber according to claim 3,
Be characterized in that: the filling thickness of every layer of expanded graphite is 9.5mm in the S5.
9. a kind of preparation method of high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber according to claim 3,
Be characterized in that: expanded graphite layer is set as three layers in the S5, and each layer parameter is as follows:
Bottom layer, containing carbon mass fraction be 96-99%, partial size is 80 mesh, volume expansion multiple is 100-150 times；
Middle part layer, containing carbon mass fraction be 93-95%, partial size is 80 mesh, volume expansion multiple is 200-300 times；
Upper layer, containing carbon mass fraction be 85-92%, partial size is 80 mesh, volume expansion multiple is 350-500 times.
10. a kind of preparation method of high-performance environment-friendly wave-absorber for electromagnetic compatible dark chamber according to claim 3,
Be characterized in that: heating furnace heating rate is 2 DEG C/min in the S6.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111534279A (en) * | 2020-05-13 | 2020-08-14 | 中国电子科技集团公司第三十三研究所 | Preparation method of V-waveband wave-absorbing powder |
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| CN101769058A (en) * | 2010-02-12 | 2010-07-07 | 泰州拓谷超细粉体材料有限公司 | Multilayer microwave unreflected chamber absorbing material filled by loose foam blocks |
| CN102200556A (en) * | 2010-03-26 | 2011-09-28 | 安宝磁科技股份有限公司 | Radio frequency microwave unreflected chamber |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769058A (en) * | 2010-02-12 | 2010-07-07 | 泰州拓谷超细粉体材料有限公司 | Multilayer microwave unreflected chamber absorbing material filled by loose foam blocks |
| CN102200556A (en) * | 2010-03-26 | 2011-09-28 | 安宝磁科技股份有限公司 | Radio frequency microwave unreflected chamber |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111534279A (en) * | 2020-05-13 | 2020-08-14 | 中国电子科技集团公司第三十三研究所 | Preparation method of V-waveband wave-absorbing powder |
| CN111534279B (en) * | 2020-05-13 | 2022-11-29 | 中国电子科技集团公司第三十三研究所 | Preparation method of V-waveband wave-absorbing powder |
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