CN103171184A - Low frequency strong magnetic field shield material - Google Patents
Low frequency strong magnetic field shield material Download PDFInfo
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- CN103171184A CN103171184A CN2011104307867A CN201110430786A CN103171184A CN 103171184 A CN103171184 A CN 103171184A CN 2011104307867 A CN2011104307867 A CN 2011104307867A CN 201110430786 A CN201110430786 A CN 201110430786A CN 103171184 A CN103171184 A CN 103171184A
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Abstract
The invention relates to a low frequency strong magnetic field shield material, which is composed of a single layer or multiple layers high conductivity material and a ferromagnetism material. The shield material is combined by the high conductivity material and the ferromagnetism material according to different orders, layers and thicknesses. The ferromagnetism material is performed with heat processing during the process for preparing the shield material. Considering the easy generation of magnetic saturation phenomenon of high magnetic permeability ferromagnetism material under strong magnetic field environment, a highly resistance magnetic saturation material is selected to reduce the strong magnetic field, then the high magnetic permeability material is employed to shield attenuated magnetic field, The high conductivity material is employed as a magnetic barrier layer between the highly resistance magnetic saturation material and the high magnetic permeability material layer, and the low frequency strong magnetic field shield material can partially shield the alternating magnetic field. According to the invention, the thickness of the shield material is about 0.2mm, the shield efficiency of the low frequency strong magnetic field at 10 kHz-500 kHz can reach 40 dB, and a technical problem that how to increase the shield efficiency of the low frequency strong magnetic field under the condition that the shield material allowanced thickness is limited can be solved.
Description
Technical field
The invention belongs to the electromangnetic spectrum field, especially for the shielding of low-frequency strong magnetic field.The frequency range in magnetic field is 10KHz～500KHz, and the magnetic field intensity scope is 2.3Gs～0.3Gs.
Background technology
Electronic equipment, instrument and meter etc. easily are subject to the interference of ambient electromagnetic field in the course of the work, in order to guarantee the normal operation of electronic equipment, instrument and meter, need to carry out electromagnetic shielding to them.If the interference source radiation field belongs to the characteristic of low-voltage, large electric current, its electromagenetic wave radiation field main manifestations is low-frequency strong magnetic field, the shielding of this low-frequency strong magnetic field is more difficult: on the one hand low frequency magnetic field belongs to the Low ESR field, although traditional high conductivity material such as copper etc. have shielding action preferably to electric field and 500KHz above electromagnetic field of high frequency, very undesirable for the shield effectiveness of this Low ESR magnetic field ripple; Although permeability magnetic material can be used for armoured magnetic field on the other hand, but in fact the magnetic conductivity of material is the function of field frequency and magnetic field intensity, it can reduce with the rising of field frequency, especially when magnetic field intensity is very large, the magnetic conductivity of permeability magnetic material sharply reduces, enter the magnetic saturation state, thereby reduce shield effectiveness.
Summary of the invention
The design and the verification method that the purpose of this invention is to provide a kind of material for low-frequency strong magnetic field shield technology field.
A kind of low-frequency strong magnetic field shielding material is characterized in that: described shielding material is made of single or multiple lift high conductivity material and ferrimagnet; When high conductivity material and ferrimagnet are individual layer, in this shielding material, from shielding magnetic field after the shielding, front magnetic field, be arranged in order high conductivity material, ferrimagnet; When high conductivity material and ferrimagnet are multilayer, in this shielding material, from shielding magnetic field after the shielding, front magnetic field, are arranged in order high conductivity material, ferrimagnet, and one deck high conductivity material is arranged between every layer of ferrimagnet.
A kind of low-frequency strong magnetic field shielding material is characterized in that: described low-frequency strong magnetic field refers to that the frequency range in magnetic field is 10KHz～500KHz, and the magnetic field intensity scope is 2.3Gs～0.3Gs.
A kind of low-frequency strong magnetic field shielding material is characterized in that: described high conductivity material refers to copper, silver or aluminium.
A kind of low-frequency strong magnetic field shielding material is characterized in that: described ferrimagnet is high resistance magnetic saturation ferrimagnet and/or high-permeability material.
A kind of low-frequency strong magnetic field shielding material is characterized in that: when described ferrimagnet was high resistance magnetic saturation material and high-permeability material, they put in order was that high resistance magnetic saturation material is than the front magnetic field of the more close shielding of high-permeability material.
A kind of low-frequency strong magnetic field shielding material is characterized in that: pure iron or ferrocobalt 1J22 that described high resistance magnetic saturation ferrimagnet is purity＞99.9%.
A kind of low-frequency strong magnetic field shielding material is characterized in that: described high-permeability material is any one in iron-nickel alloy 1J50,1J79,1J85.
A kind of low-frequency strong magnetic field shielding material is characterized in that: described every layer of ferrimagnet thickness range is 0.05mm～0.5mm.
A kind of low-frequency strong magnetic field shielding material is characterized in that: the every floor height electrical conductivity materials thickness range in the high conductivity material of described single or multiple lift is 0.01～0.1mm.
A kind of low-frequency strong magnetic field shielding material is characterized in that: described shielding material general thickness scope is 0.06mm～1.0mm.
A kind of low-frequency strong magnetic field shielding material is characterized in that: described ferrimagnet needs heat-treat under vacuum or hydrogen condition, and heat treatment temperature is 700 ℃～1300 ℃, temperature retention time 2～10h, fast rate of temperature fall＞200 ℃ when cold/h.
Described high conductivity material and ferrimagnet make up according to modes such as different order, the number of plies and thickness respectively, and Fig. 1 is the structural representation of the shielding material when being two-layer when ferrimagnet.As shown in Figure 1, low-frequency strong magnetic field shielding material of the present invention is from shielding front magnetic field H
0To the rear magnetic field H of shielding
1, be arranged in order high conductivity material 1, high resistance magnetic saturation material 2, high conductivity material 1 and high-permeability material 3.
The present invention is directed to the technical barrier that low-frequency strong magnetic field is difficult to conductively-closed, from the starting point that is designed to of shielding material, use high conductivity material and ferrimagnet and make up according to modes such as different order, the number of plies and thickness respectively and carry out composite shielding.Adopt high resistance magnetic saturation material tentatively to weaken high-intensity magnetic field, adopt the magnetic field after high-permeability material further shields reduction, use the high conductivity material on the one hand as the magnetic barrier layer between high resistance magnetic saturation material layer and high-permeability material layer, also have on the other hand the effect of partly shielding effect alternating magnetic field.
The present invention is applied to the electromagnetic shielding such as electronic equipment, instrument and meter field can effectively improve the ability that their anti-low-frequency strong magnetic fields disturb, and also has great importance for the low frequency magnetic field shield technology level that improves long-term puzzlement China electronic equipment electromagnetic compatibility simultaneously.
The specimen of low-frequency strong magnetic field shielding material of the present invention is achieved through the following technical solutions:
(1) the long 450mm of preparation, external diameter 30mm, the PVA cylindrical tube of wall thickness 0.5mm is as the support frame of specimen.
(2) ferrimagnet after PVA cylindrical tube outer wall pastes one or more layers heat treatment, wherein high-permeability material is as the internal layer screen layer, high resistance magnetic saturation material is as outer screen layer, and the every layer thickness of ferrimagnet is 0.05～0.5mm, and length is 450mm.
(3) paste high conductivity material such as copper, silver, aluminium etc. between sample outermost layer or multilayer ferrimagnet, every floor height electrical conductivity materials thickness is 0.01～0.1mm, and length is 450mm.
Beneficial effect of the present invention is: when shielding material of the present invention is the 0.2mm left and right at thickness, the shield effectiveness of the low-frequency strong magnetic field of 10kHz～500kHz has been reached 40dB, proved that this material is a kind of effective low-frequency strong magnetic field shielding material.At present, allowing how to improve the low-frequency strong magnetic field shield effectiveness under the limited condition of thickness at shielding material is a technical barrier, and technological achievement of the present invention can provide to the solution of this technical barrier design considerations and technological guidance.
Description of drawings
Fig. 1 is the structural representation of the shielding material when being two-layer when ferrimagnet.Shown in figure, 1 is the high conductivity material, and 2 is high resistance magnetic saturation material, and 3 is high-permeability material.H
0For shielding front magnetic field, H
1For shielding rear magnetic field.
Fig. 2 is the low frequency magnetic field shield effectiveness of embodiment 1 specimen.
Fig. 3 is the low frequency magnetic field shield effectiveness of embodiment 2 specimen.
Fig. 4 is the low frequency magnetic field shield effectiveness of embodiment 3 specimen.
Fig. 5 is the low frequency magnetic field shield effectiveness of embodiment 4 specimen.
Fig. 6 is the low frequency magnetic field shield effectiveness of embodiment 5 specimen.
Fig. 7 is the low frequency magnetic field shield effectiveness of embodiment 6 specimen.
Fig. 8 is the low frequency magnetic field shield effectiveness of embodiment 7 specimen.
Fig. 9 is the low frequency magnetic field shield effectiveness of embodiment 8 specimen.
Figure 10 is the low frequency magnetic field shield effectiveness of embodiment 9 specimen.
The specific embodiment
The invention will be further described below in conjunction with embodiment:
In the following embodiments, in embodiment 1 and embodiment 2, high conductivity material and ferrimagnet are individual layer.In embodiment 3-9, high conductivity material and ferrimagnet are multilayer, and still, in embodiment 3,1J79 and 1J50 are high-permeability material; In embodiment 9,1J85 and 1J50 are high-permeability material.Only having the ferrimagnet in embodiment 4-8 is high-permeability material and high resistance magnetic saturation material." 1J50 (high-permeability material) and 1J22 (high resistance magnetic saturation material) " in embodiment 4, " 1J50 band (high-permeability material) and electrical pure iron (high resistance magnetic saturation material) " in embodiment 5, " 1J85 (high-permeability material) in embodiment 6, 1J50 (high-permeability material) and 1J22 ferromagnetism band (high resistance magnetic saturation material) ", " 1J79 (high-permeability material) and 1J22 ferromagnetism band (high resistance magnetic saturation material) " in embodiment 7, it is all that high resistance magnetic saturation material is than the front magnetic field of the more close shielding of high-permeability material that the high resistance magnetic saturation material of " 1J85 (high-permeability material) and 1J22 ferromagnetism band (high resistance magnetic saturation material) " in embodiment 8 and high-permeability material put in order.
Embodiment 1
At first prepare the PVA cylindrical tube according to the described technical scheme of summary of the invention, then pasting a layer thickness at outer wall is the thick 1J85 ferromagnetism band of 0.1mm, and the outermost in specimen pastes the aluminium foil that a layer thickness is 0.03mm at last.The Technology for Heating Processing of ferrimagnet is: vacuum atmosphere, and 1180 ℃ of heat treatment temperatures are incubated 4 hours, then are cooled to 600 ℃ through 3 hours, and applying argon gas is chilled to soon 150 ℃ with the cooldown rate of 500 ℃/h and comes out of the stove.This sample is placed in its shielding properties of uniform magnetic field test, and the frequency range in this magnetic field is 10KHz～500KHz, and the magnetic field intensity scope is 2.3Gs～0.3Gs.Test result as shown in Figure 2, material when 10KHz shield effectiveness less than 40dB, at the above shield effectiveness of 20KHz greater than 40dB.
At first prepare the PVA cylindrical tube according to the described technical scheme of summary of the invention, then pasting a layer thickness at outer wall is the thick 1J50 ferromagnetism band of 0.1mm, and the outermost in specimen pastes the aluminium foil that a layer thickness is 0.03mm at last.The Technology for Heating Processing of ferrimagnet is: vacuum atmosphere, and 1150 ℃ of heat treatment temperatures are incubated 5 hours, then are cooled to 600 ℃ through 3 hours, and applying argon gas is chilled to soon 150 ℃ with the cooldown rate of 400 ℃/h and comes out of the stove.This sample is placed in its shielding properties of uniform magnetic field test, and the frequency range in this magnetic field is 10KHz～500KHz, and the magnetic field intensity scope is 2.3Gs～0.3Gs.Test result as shown in Figure 3, material when 10KHz～30KHz shield effectiveness less than 40dB, at the above shield effectiveness of 40KHz greater than 40dB.
At first prepare the PVA cylindrical tube according to the described technical scheme of summary of the invention, then paste the thick 1J79 of one deck 0.05mm and the thick 1J50 ferromagnetism band of 0.1mm at outer wall respectively, at last respectively between the ferromagnetism band and the outermost layer of specimen paste the aluminium foil that a layer thickness is 0.03mm.The Technology for Heating Processing of 1J79 ferrimagnet is: vacuum atmosphere, and 1180 ℃ of heat treatment temperatures are incubated 4 hours, then are cooled to 600 ℃ through 3 hours, and applying argon gas is chilled to soon 150 ℃ with the cooldown rate of 500 ℃/h and comes out of the stove.The Technology for Heating Processing of 1J50 ferrimagnet is: vacuum atmosphere, and 1150 ℃ of heat treatment temperatures are incubated 5 hours, then are cooled to 600 ℃ through 3 hours, and applying argon gas is chilled to soon 150 ℃ with the cooldown rate of 400 ℃/h and comes out of the stove.This sample is placed in its shielding properties of uniform magnetic field test, and the frequency range in this magnetic field is 10KHz～500KHz, and the magnetic field intensity scope is 2.3Gs～0.3Gs.Test result as shown in Figure 4, material in 10KHz～500KHz frequency range inner shield usefulness greater than 40dB.
Embodiment 4
At first prepare the PVA cylindrical tube according to the described technical scheme of summary of the invention, then paste the thick 1J50 of one deck 0.1mm and the thick 1J22 ferromagnetism band of 0.1mm at outer wall respectively, at last respectively between the ferromagnetism band and the outermost layer of specimen paste the Copper Foil that a layer thickness is 0.05mm.The Technology for Heating Processing of 1J22 ferrimagnet is: vacuum atmosphere, and 880 ℃ of heat treatment temperatures are incubated 3 hours, then are cooled to 750 ℃ through 2 hours, and applying argon gas is chilled to soon 150 ℃ with the cooldown rate of 200 ℃/h and comes out of the stove.The Technology for Heating Processing of 1J50 ferrimagnet is: vacuum atmosphere, and 1200 ℃ of heat treatment temperatures are incubated 4 hours, then are cooled to 600 ℃ through 3 hours, and applying argon gas is chilled to soon 100 ℃ with the cooldown rate of 400 ℃/h and comes out of the stove.This sample is placed in its shielding properties of uniform magnetic field test, and the frequency range in this magnetic field is 10KHz～500KHz, and the magnetic field intensity scope is 2.3Gs～0.3Gs.Test result as shown in Figure 5, material in 20KHz～500KHz frequency range inner shield usefulness greater than 40dB.
Embodiment 5
At first prepare the PVA cylindrical tube according to the described technical scheme of summary of the invention, then paste the thick 1J50 band of one deck 0.1mm and the thick electrical pure iron of 0.1mm at outer wall respectively, at last respectively between 1J50 band and electrical pure iron and the outermost layer of specimen paste the Copper Foil that a layer thickness is 0.03mm.The Technology for Heating Processing of 1J50 ferrimagnet is: vacuum atmosphere, and 1150 ℃ of heat treatment temperatures are incubated 4 hours, then are cooled to 650 ℃ through 4 hours, and applying argon gas is chilled to soon 150 ℃ with the cooldown rate of 500 ℃/h and comes out of the stove.This sample is placed in its shielding properties of uniform magnetic field test, and the frequency range in this magnetic field is 10KHz～500KHz, and the magnetic field intensity scope is 2.3Gs～0.3Gs.Test result as shown in Figure 6, material in 20KHz～500KHz frequency range inner shield usefulness greater than 40dB.
Embodiment 6
At first prepare the PVA cylindrical tube according to the described technical scheme of summary of the invention, then paste the thick 1J50 of the thick 1J85 of one deck 0.1mm, 0.1mm and the thick 1J22 ferromagnetism band of 0.1mm at outer wall respectively, at last respectively between each ferromagnetism band and the outermost layer of specimen paste the aluminium foil that a layer thickness is 0.03mm.The Technology for Heating Processing of 1J85 ferrimagnet is: vacuum atmosphere, and 1180 ℃ of heat treatment temperatures are incubated 4 hours, then are cooled to 600 ℃ through 3 hours, and applying argon gas is chilled to soon 150 ℃ with the cooldown rate of 500 ℃/h and comes out of the stove.The Technology for Heating Processing of 1J50 ferrimagnet is: vacuum atmosphere, and 1150 ℃ of heat treatment temperatures are incubated 5 hours, then are cooled to 600 ℃ through 3 hours, and applying argon gas is chilled to soon 150 ℃ with the cooldown rate of 400 ℃/h and comes out of the stove.The Technology for Heating Processing of 1J22 ferrimagnet is: vacuum atmosphere, and 800 ℃ of heat treatment temperatures are incubated 3 hours, then are cooled to 700 ℃ through 2 hours, and applying argon gas is chilled to soon 150 ℃ with the cooldown rate of 200 ℃/h and comes out of the stove.This sample is placed in its shielding properties of uniform magnetic field test, and the frequency range in this magnetic field is 10KHz～500KHz, and the magnetic field intensity scope is 2.3Gs～0.3Gs.Test result as shown in Figure 7, material in 10KHz～500KHz frequency range inner shield usefulness greater than 40dB.
Embodiment 7
At first prepare the PVA cylindrical tube according to the described technical scheme of summary of the invention, then paste the thick 1J79 of one deck 0.05mm and the thick 1J22 ferromagnetism band of 0.1mm at outer wall respectively, at last respectively between the ferromagnetism band and the outermost layer of specimen paste the Copper Foil that a layer thickness is 0.05mm.The Technology for Heating Processing of 1J79 ferrimagnet is: hydrogen atmosphere, 1200 ℃ of heat treatment temperatures are incubated 4 hours, then are cooled to 600 ℃ through 3 hours, are chilled to soon 100 ℃ with the cooldown rate of 500 ℃/h and come out of the stove.The Technology for Heating Processing of 1J22 ferrimagnet is: hydrogen atmosphere, and 880 ℃ of heat treatment temperatures are incubated 4 hours, then are cooled to 750 ℃ through 2 hours, and applying argon gas is chilled to soon 100 ℃ with the cooldown rate of 200 ℃/h and comes out of the stove.This sample is placed in its shielding properties of uniform magnetic field test, and the frequency range in this magnetic field is 10KHz～100KHz, and the magnetic field intensity scope is 2.3Gs～1.2Gs.Test result as shown in Figure 8, material in 10KHz～100KHz frequency range inner shield usefulness greater than 40dB.
Embodiment 8
At first prepare the PVA cylindrical tube according to the described technical scheme of summary of the invention, then paste the thick 1J85 of one deck 0.1mm and the thick 1J22 ferromagnetism band of 0.1mm at outer wall respectively, at last respectively between the ferromagnetism band and the outermost layer of specimen paste the Copper Foil that a layer thickness is 0.05mm.The Technology for Heating Processing of 1J85 ferrimagnet is: hydrogen atmosphere, 1180 ℃ of heat treatment temperatures are incubated 4 hours, then are cooled to 600 ℃ through 3 hours, are chilled to soon 100 ℃ with the cooldown rate of 500 ℃/h and come out of the stove.The Technology for Heating Processing of 1J22 ferrimagnet is: hydrogen atmosphere, and 850 ℃ of heat treatment temperatures are incubated 4 hours, then are cooled to 700 ℃ through 2 hours, and applying argon gas is chilled to soon 100 ℃ with the cooldown rate of 200 ℃/h and comes out of the stove.This sample is placed in its shielding properties of uniform magnetic field test, and the frequency range in this magnetic field is 10KHz～100KHz, and the magnetic field intensity scope is 2.3Gs～1.2Gs.Test result as shown in Figure 9, material in 10KHz～100KHz frequency range inner shield usefulness greater than 40dB.
Embodiment 9
At first prepare the PVA cylindrical tube according to the described technical scheme of summary of the invention, then paste the thick 1J85 of one deck 0.1mm and the thick 1J50 ferromagnetism band of 0.1mm at outer wall respectively, at last respectively between the ferromagnetism band and the outermost layer of specimen paste the aluminium foil that a layer thickness is 0.05mm.The Technology for Heating Processing of 1J85 ferrimagnet is: vacuum atmosphere, 1180 ℃ of heat treatment temperatures are incubated 4 hours, then are cooled to 600 ℃ through 3 hours, are chilled to soon 150 ℃ with the cooldown rate of 500 ℃/h and come out of the stove.The Technology for Heating Processing of 1J50 ferrimagnet is: vacuum atmosphere, and 1150 ℃ of heat treatment temperatures are incubated 5 hours, then are cooled to 600 ℃ through 2 hours, and applying argon gas is chilled to soon 150 ℃ with the cooldown rate of 400 ℃/h and comes out of the stove.This sample is placed in its shielding properties of uniform magnetic field test, and the frequency range in this magnetic field is 10KHz～100KHz, and the magnetic field intensity scope is 2.3Gs～1.2Gs.Test result as shown in figure 10, material in 10KHz～100KHz frequency range inner shield usefulness greater than 50dB.
Claims (10)
1. low-frequency strong magnetic field shielding material, it is characterized in that: described shielding material is to be made of the high conductivity material of single or multiple lift and the ferrimagnet of single or multiple lift; When high conductivity material and ferrimagnet are individual layer, in this shielding material, from shielding magnetic field after the shielding, front magnetic field, be arranged in order high conductivity material, ferrimagnet; When high conductivity material and ferrimagnet are multilayer, in this shielding material, from shielding magnetic field after the shielding, front magnetic field, are arranged in order high conductivity material, ferrimagnet, and one deck high conductivity material is arranged between every layer of ferrimagnet.
2. a kind of low-frequency strong magnetic field shielding material according to claim 1, it is characterized in that: described low-frequency strong magnetic field refers to that the frequency range in magnetic field is 10KHz～500KHz, and the magnetic field intensity scope is 2.3Gs～0.3Gs.
3. a kind of low-frequency strong magnetic field shielding material according to claim 1, it is characterized in that: described high conductivity material refers to copper, silver or aluminium.
4. a kind of low-frequency strong magnetic field shielding material according to claim 1, it is characterized in that: described ferrimagnet is high resistance magnetic saturation ferrimagnet and/or high-permeability material.
5. a kind of low-frequency strong magnetic field shielding material according to claim 1, is characterized in that: pure iron or ferrocobalt 1J22 that described high resistance magnetic saturation ferrimagnet is purity＞99.9%.
6. a kind of low-frequency strong magnetic field shielding material according to claim 1, it is characterized in that: described high-permeability material is any one in iron-nickel alloy 1J50,1J79,1J85.
7. a kind of low-frequency strong magnetic field shielding material according to claim 1, it is characterized in that: every layer of ferrimagnet thickness range in the ferrimagnet of described single or multiple lift is 0.05mm～0.5mm.
8. a kind of low-frequency strong magnetic field shielding material according to claim 1, it is characterized in that: the every floor height electrical conductivity materials thickness range in the high conductivity material of described single or multiple lift is 0.01mm～0.1mm.
9. a kind of low-frequency strong magnetic field shielding material according to claim 1, it is characterized in that: described ferrimagnet is heat-treated under vacuum or hydrogen condition, heat treatment temperature is 700 ℃～1300 ℃, temperature retention time 2～10h, fast rate of temperature fall＞200 ℃ when cold/h.
10. a kind of low-frequency strong magnetic field shielding material according to claim 4, it is characterized in that: when described ferrimagnet was high resistance magnetic saturation material and high-permeability material, they put in order was that high resistance magnetic saturation material is than the front magnetic field of the more close shielding of high-permeability material.
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| CN105307465A (en) * | 2015-11-17 | 2016-02-03 | 华东师范大学 | Electromagnetic anti-interference composite layer structure and device employing same |
| CN105682436A (en) * | 2014-11-21 | 2016-06-15 | 贵州航天天马机电科技有限公司 | Broadband electromagnetic shielding layer |
| CN106515126A (en) * | 2016-11-08 | 2017-03-22 | 广东小天才科技有限公司 | Magnetic laminated structure, preparation method of magnetic laminated structure and input device |
| CN108387854A (en) * | 2018-04-04 | 2018-08-10 | 中国人民解放军61489部队 | Shield magnetic saturation performance testing device and method under low-frequency pulse strong magnetic field circumstance |
| CN110863279A (en) * | 2019-10-14 | 2020-03-06 | 西安工程大学 | Magnetic shielding fabric and preparation method thereof |
| WO2021092713A1 (en) * | 2019-11-11 | 2021-05-20 | 常德鑫睿新材料有限公司 | Electromagnetic shielding composite material and preparation method therefor |
| CN112980199A (en) * | 2021-04-19 | 2021-06-18 | 闽都创新实验室 | Organosilicon composite magnetic material for shielding low-frequency alternating magnetic field and preparation method thereof |
| CN113038813A (en) * | 2021-03-05 | 2021-06-25 | 云南电网有限责任公司电力科学研究院 | Shielding device for strong magnetic field |
| CN117062425A (en) * | 2023-09-11 | 2023-11-14 | 北京市大唐盛兴科技发展有限公司 | Blocking and electromagnetic signal shielding protective film for laser eavesdropping |
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| CN105682436A (en) * | 2014-11-21 | 2016-06-15 | 贵州航天天马机电科技有限公司 | Broadband electromagnetic shielding layer |
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| CN105307465A (en) * | 2015-11-17 | 2016-02-03 | 华东师范大学 | Electromagnetic anti-interference composite layer structure and device employing same |
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| CN106515126A (en) * | 2016-11-08 | 2017-03-22 | 广东小天才科技有限公司 | Magnetic laminated structure, preparation method of magnetic laminated structure and input device |
| CN108387854A (en) * | 2018-04-04 | 2018-08-10 | 中国人民解放军61489部队 | Shield magnetic saturation performance testing device and method under low-frequency pulse strong magnetic field circumstance |
| CN110863279A (en) * | 2019-10-14 | 2020-03-06 | 西安工程大学 | Magnetic shielding fabric and preparation method thereof |
| WO2021092713A1 (en) * | 2019-11-11 | 2021-05-20 | 常德鑫睿新材料有限公司 | Electromagnetic shielding composite material and preparation method therefor |
| CN113038813A (en) * | 2021-03-05 | 2021-06-25 | 云南电网有限责任公司电力科学研究院 | Shielding device for strong magnetic field |
| CN112980199A (en) * | 2021-04-19 | 2021-06-18 | 闽都创新实验室 | Organosilicon composite magnetic material for shielding low-frequency alternating magnetic field and preparation method thereof |
| CN117062425A (en) * | 2023-09-11 | 2023-11-14 | 北京市大唐盛兴科技发展有限公司 | Blocking and electromagnetic signal shielding protective film for laser eavesdropping |
| CN117062425B (en) * | 2023-09-11 | 2024-06-04 | 北京市大唐盛兴科技发展有限公司 | Blocking and electromagnetic signal shielding protective film for laser eavesdropping |
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Application publication date: 20130626 |