Magnetically soft fabric

FIELD: woven materials for magnetic systems and electromagnetic radiation shields.

SUBSTANCE: proposed magnetically soft fabric used as magnetically soft material has mixture of powdered alloy of falsifier with grain size of 5 to 10 μm and magnetically soft Mn-Zn-ferrite with grain size of 50 to 100 μm , and binding polymer. Fabric warp is made of lavsan using textile technology; proportion of ingredients is as follows, mass percent: lavsan threads, 30-20; binding polymer, 15-20; magnetically soft ferrite powder, 30-50.

EFFECT: ability of shielding external superhigh-frequency electromagnetic radiation in ferromagnetic resonance mode.

1 cl, 1 tbl, 3 ex

 

The invention relates to textile materials and can be used in various branches of engineering and technology for the manufacture of magnetic systems, as well as for shielding electromagnetic radiation.

Known electromagnetic material [1], containing (80-95)% of ferromagnetic powder, (5-20)% thermosetting resin in powder form and (0,1-1,0)% of relationbetween for metal. The products of the above-mentioned mixture is characterized by high mechanical strength and a large value of the initial magnetic permeability. However, this material has disadvantages: the initial and the maximum magnetic permeability as the similar characteristics of modern magnetic materials, such as alifuru (Fe-Si-Al); it is impossible to manufacture products by methods of deformation and sewing technology, because it is not flexible enough, its inelastic deformation before fracture is negligible.

Closest to the proposed material is elastic composite material based on rubber [2]. The composition of this material is natural or synthetic rubber (30-75) parts by weight, the iron powder, its magnetic oxide or ferrite (10-40 parts by weight, and the rest of the plasticizer, mixing the agent and other impurities. The material has a natural ability to resize and the Orme under the influence of a magnetic field. The disadvantages of this material are the following: low initial value and the maximum magnetic permeability and magnetization and residual induction, the presence of microstructure and phase inhomogeneities and, as a consequence, the heterogeneity of properties in different zones, causing scattering of the magnetic field.

Technical result due to the use of the present invention is to obtain a flexible magnetic material with high magnetic characteristics and the ability to control these characteristics of a material by means of an external magnetic field, causing, for example, the external shielding of microwave electromagnetic radiation in the mode ferromagnetic resonance.

This technical result is achieved due to the fact that magnetic fabric containing a polymer base and a soft magnetic powder material according to the invention is formed by a mixture of powders of magnetic alloy alsever with a particle size of 5 to 10 μm and soft magnetic ferrite with a particle size of 50 to 100 μm, and the base is made of yarn of polyester, in the following ratio of tissue components, wt.%:

strands Dacron30...20
the binder polymer15...20
15...20
powder alloy alsever30...50

Alloy alsever has a high value of magnetic permeability, for example, the maximum μmaxthis alloy with optimum content of silicon, aluminum and iron can reach unique large values 3800000. Initial magnetic permeability μ this alloy is equal to 35000. Increased value μ. causes a higher shielding ability of the material. Electrical resistivity ρ alloy alsever approximately 1.5 times higher compared to ρ electrical steel and permalloy, which means that the presence of the powder of the alloy contributes to the increase of the penetration depth of the electromagnetic field in the material and amount of material involved in the absorption of radiation. The soft magnetic ferrites such as manganese-zinc, is also characterized by large values of the magnetic permeability. Along with high performance magnetic properties of ferrites are semiconducting conductivity, electrical resistivity by about four orders of magnitude higher than ρ such soft magnetic materials, such as electrical steel and permalloy. In the areas of the ferrite particles of the incident electromagnetic radiation is their penetrates to a relatively great depth in the material. In the process of absorption and scattering of external radiation involved particles alsever not only on the surface, but also in the inner zones of the material. The depth of penetration of microwave radiation in the material, with a value of ρ characteristic of all soft magnetic materials other than ferrite, is less than 1 μm. By changing the magnitude and direction of the internal magnetic field by use of powder with different particle size, and by the formation of anisotropic structures and varying the magnitude and the direction of the external constant magnetic field, you can change the frequency and width of the absorption spectrum of external radiation in ferroresonance mode. Unlike most magnetic materials alsever and soft magnetic ferrites at room temperature are in a fragile state so it is easy to get the powder, which in combination with the polymer technologically simply applied to the surface of the fabric. The particle size of the alloy alsever is (5-10 microns), which effectively shields the external radiation, for example, due to the occurrence of eddy currents and ferroresonance absorption. The size of the ferrite particles is equal to (100-300 microns), which causes the penetration of radiation in the inner zone of material and involvement in the process of screening almost the entire volume of redlagaemoe soft tissue. The difference in particle sizes of alsever and ferrite allows to form on the fabric surface dense layer of soft ferromagnetic material

Examples of specific implementation

Example 1.

The obtained ferromagnetic tissue matrix which is a plain weave fabric made from Dacron traditional textile technologies. The linear density of warp and weft was 40 Tex. The density of packing of main and weft threads is equal to 1500 at one meter. As magnetic filler selected mixture of powders of alloy alsever with a particle size of 5 to 10 μm and manganese-zinc ferrite with a particle size of 50 to 100 microns.

Content of the tissue components, wt.%:

strands Dacron20
the binder polymer15
the powder of manganese-zinc ferrite15
powder alloy alsever50

The resulting fabric is superior to the prototype by value (see table): initial magnetic permeability at 8 times the rate of shielding electromagnetic radiation at a frequency of 109...1010Hz 8.6 times the resistance to propagation of cracks and flexibility in...2,4 2,2 times.

Example 2.

Manufactured fabric, the Foundation of which was made the C strands Dacron, as in the case of example 1. The content of components was as wt.%: filament polyester 30%; the binder polymer is 20%; powder Mn-Zn-ferrite 20%, the powder alloy alsever 40%. As can be seen from the table, the decrease in the content of the powder alloy alsever and comparison with example 1 did not lead to significant changes in the properties of the resulting fabric.

Example 3.

In this embodiment, tissue, compared with example 2, a higher content of soft magnetic materials with low content of polyester and polymer binder. This led to the loss of flexibility and strength in the presence of strain, but allowed to increase the initial magnetic permeability and the rate of shielding electromagnetic radiation (see table).

The content of the soft magnetic powder is selected depending on the functional purpose of the fabric. The amount of the binder polymer is chosen such as to ensure the adhesion of the powder with a cloth, the share of strands Dacron determine, based on the need to achieve appropriate "capacity" of fabric on the amount of powder.

Sources of information

1. EPO 0225392, H 01 F 1/02, publ. 16.06.87.

2. Patent of the Russian Federation 2157013, 7 P 01 F 1/113, publ. 27.09.2000.

Table
Characteristics of the tested soft magnetic materials
OptionContent, wt.%The strength of the strip width of 50 mm, with an incision of 5 mm, HThe initial value of the magnetic permeabilityRelates. the lengthening strip width of 50 mm before destruction, %Index of flexibility, otedIndicator shielding electromagnetic radiation
Strands DacronThe binder is polyamidePowder Mn-Zn-ferritePowder alloy alsever
The placeholder28036007,911
Example 1201515506102930013,82,48,6
Example 2302020309202140016,2a 3.98,1
Example 3251520407052860014,63,29,8

Magnetic fabric containing polymer osnovi powder magnetic material, characterized in that, as a magnetic material, a mixture of powders of alloy alsever with particle size 5÷10 μm and soft magnetic ferrite with a particle size of 50÷100 μm with a binder polymer, and the base is made of yarn of polyester, the ratio of components of the tissue mass following, %:

Strands Dacron30÷20
The binder polymer15÷20
The soft magnetic powder of ferrite15÷20
Powder alloy alsever30÷50



 

Same patents:

FIELD: engineering of protective devices for protecting electric connectors from electromagnetic interference.

SUBSTANCE: protective device for protecting electric connector 3 of electronic board 2 from electromagnetic interference, while connector 3 has a body made of plastic, having frontal surface, serving for interaction with detachable socket connector, and connecting side surface, touching the plate 2 of circuit board, while connector 3 has multiple contacts 31, each one of which has one end in form a thorn, protruding from connecting side surface, while thorns are mounted through apertures in aforementioned board 2 for electric connection of contacts 31 with one or several conducting tracks of circuit board, while one of these contains first screening element, passing in such a way that it is facing side surface of connector 3, which is opposite to connecting side surface, positioned so, that it is facing back surface of connector 3, contacting grounding conductive track of board 2 of circuit board, and second screening element, mounted on the surface of board 2, which is opposite to its surface in contact with connector 3 and passing so that it is facing aforementioned connecting side surface, while second screening element is in contact with conductive track, connected to aforementioned grounding track of circuit board, so that it is electrically connected to first screening element for forming of a potential cage.

EFFECT: decreased number of contacts present in socket connector for electronic boards, decreased costs of equipment.

15 cl, 12 dwg

FIELD: radio engineering, possible use for realization of radio communication, control systems and in computer devices.

SUBSTANCE: proposed method has following order of operations: in screened state with lid elements for connecting computer to external circuits are positioned (lower frequency filter fro keyboard, lower frequency filter of USB port, lower frequency filter of power, infrared mouse receiver, optical transformer of local area network and other elements); - on base cover in vertical position system block is mounted, covered by screened cover, which is affixed to base cover; - flat LCD monitor is positioned in screened packet of nickel mesh with glass screen; - screened packet is held on monitor by means of rotary bracket; - rotary bracket is suspended with monitor affixed thereto onto screened cover; - connection of electric circuits of LCD monitor to system block is provided for through flexible screening cable, let through lid of base; - cable of screening keyboard is connected to screened base.

EFFECT: expanded functional screening capabilities for providing for high ergonomic and operational characteristics of energy-informative protected computer.

1 dwg

FIELD: engineering of protective radio-electronic means, possible use as a protective screen.

SUBSTANCE: reflector is made in form of rotor with radio-reflective surfaces connected thereto, made in form of blades. Blades are made of three layers of radio-transparent film, average layer of which is metallized by aluminum. In source state blades are wound on rotor body. On back end surface of rotor, rotation engine is mounted. Rotor is turned by means of traction, formed by rotation engine. Blades are driven into working state by centrifugal forces and following supercharge by remainder pressure from previously activated rotation engine. Blades can be capable of altering rotation angle relatively to their axis.

EFFECT: electromagnetic emission reflector has insignificant mass-dimensional characteristics, is capable of forming a radiolocation shadow of large dimensions and capable of maintaining maximal effectiveness of radiolocation interference in given direction along whole portion of object flight trajectory in space.

3 dwg

FIELD: protection from electromagnetic emission.

SUBSTANCE: mesh of electric-conductive material is positioned on dielectric transparent film with applied transparent electric-conductive layer, made either of indium, or of tin, or of indium/tin alloy with thickness, approximately equal to 0,1 of skin layer, and the very mesh is applied with thickness not exceeding skin-layer by printer or plotter using electric-conductive compound, consisting of ultra-dispersive electric-conductive powder with stable electric conductivity and average size of particles 10,0-600,0 nm, polymer linking component, organic solvent and surfactant with certain ratio of components.

EFFECT: forming of transparent screens, screening properties of which do not depend on falling angle of electromagnetic emission, also light and simple to manufacture.

2 tbl

FIELD: radio communications.

SUBSTANCE: device has multilayer electronic board with outer and inner conductive layers, carrying printed conductors and electric radio-elements, grouped in functional zones screened by barrier and planar screens. Functional zones are connected to power points positioned beyond their borders by appropriate two-conductor power feeds, consisting of couples of printed conductors Power and Ground, while inside the functional zone printed conductor Power of power feed is connected to appropriate filtering element, and printed conductor Ground - to ground plane, while functional zones are surrounded along their perimeters by individual barrier screens, constructively not connected to ground planes and connected to point of attachment of Ground potential on multilayer printed board by own ground printed conductors.

EFFECT: electromagnetically compatible different functional zones, including the case, when each one of them has common boundary with more than one other functional zone.

2 cl, 11 dwg

FIELD: radio communications.

SUBSTANCE: device has multi-layer electronic board with outer and inner conductive layers, carrying conductors and electric radio-elements, grouped in screened functional zones using barrier and plane screens. Each screened functional zone has own barrier screen, positioned along its perimeter, and own ground plane, serving as its plane screen, while ground planes and barrier screens are constructively not interconnected, and ground links, connecting ground planes of screened functional zones together and to shown point of Earth potential input, pass through appropriate gaps in screening conductors of barrier screens, while barrier screens are connected to same point of Earth potential input by own ground conductors.

EFFECT: higher efficiency.

2 cl, 10 dwg

FIELD: computer periphery.

SUBSTANCE: device has back wall, made of metallic alloy with flowing limit Re = 210-280 N/mm2 and durability limit Rm = 270-410 N/mm2.

EFFECT: lesser dimensions of display, possible utilization with following secondary processing of broken-down bodies of display, higher safety of user, increased durability.

FIELD: production of the materials intended to protect people in industrial, administrative and living premises against action of electromagnetic fields of the radio-frequency range.

SUBSTANCE: the invention is pertaining to production of materials intended to protect people in industrial, administrative and living premises against action of electromagnetic fields of the radio-frequency range generated by operation of electrical circuits, electric appliances, mobile and radio telephones, and also for protection of the people against a geopathogenic environmental activity. The material based on schungite mineral represents a three-layered material, two exterior layers of which consist of a carton or a plastic sheet, on each side of which a printing ink containing fragments of a schungite mineral is applied, and in the capacity of the middle layer the aluminum foil is used. At that the layers are connected by a glue. To increase the strength of the three-layered material it is drawn for example through rollers or placed under a press. The printing ink contains particles of the schungite mineral, these particles have dimensions of 5-10 microns and make 90 % of the mass of the printing ink, in which they are dispersed. The printing ink containing the particles of the schungite mineral makes 6-7 % of the mass of the board or 3-3.5 % of the mass of the plastic material. The layer of the carton has a depth of 0.3 mm, and the layer of plastic material has the depth of 0.6 mm. The technical result of the invention is production of the material from the accessible raw being an effective and low-cost material for protection of people against action of electromagnetic fields of the radio-frequency range generated in the process of the operation of electric appliances, electrical circuits, at exploitation mobile and radiophones, and also from a geopathogenic action of the environment.

EFFECT: the invention ensures production from an accessible raw material of an effective and low-cost material for protection of people against action of the radio-frequency range electromagnetic fields generated during operation by different electrical appliances, circuits and telephones.

5 cl, 4 ex, 1 tbl

The invention relates to a personal element to be inserted into the bearing frame plug-in units with electromagnetic shielding

The invention relates to electromagnetic protection of the electronic circuit boards of electronic equipment

FIELD: woven fabrics for magnetic systems, radioactive radiation shields, biologic process stimulation in living organisms.

SUBSTANCE: proposed highly coercive fabric is, essentially, reticular structure of linen weave of polyamide warp threads and shoot wires, and combination of acrylic copolymers and highly coercive neodymium-iron-boron alloy powder; linear density of warp threads and shoot wires is 20 to 100 tex, and their quantity per meter is 1 500 to 6 500, proportion of ingredients being as follows, mass percent: polyamide threads, 10-50; acrylic copolymers, 15-25, highly coercive neodymium-iron-boron alloy powder, 65-35.

EFFECT: enhanced flexibility and ergonomic efficiency, facilitated manufacture.

1 cl, 1 tbl, 3 ex

FIELD: woven fabrics for magnetic systems, radioactive radiation shields, biologic process stimulation in living organisms.

SUBSTANCE: proposed highly coercive fabric is, essentially, reticular structure of linen weave of polyamide warp threads and shoot wires, and combination of acrylic copolymers and highly coercive neodymium-iron-boron alloy powder; linear density of warp threads and shoot wires is 20 to 100 tex, and their quantity per meter is 1 500 to 6 500, proportion of ingredients being as follows, mass percent: polyamide threads, 10-50; acrylic copolymers, 15-25, highly coercive neodymium-iron-boron alloy powder, 65-35.

EFFECT: enhanced flexibility and ergonomic efficiency, facilitated manufacture.

1 cl, 1 tbl, 3 ex

FIELD: woven fabrics for magnetic systems and radioactive radiation shields.

SUBSTANCE: proposed ferromagnetic fabric characterized in enhanced strength and magnetic characteristics, ability of absorbing and dissipating electromagnetic radiation has warp, polymeric binder, and powdered ferromagnetic material. Fabric warp is made by linen weave method. Warp threads and shoot wires are made of alternating lavsan and magnetically soft single threads. Number of threads per meter is 5 000 to 7 000. Magnetically soft threads are made either of supermalloy or molybdenum permalloy with diameter measuring 0.05 to 0.1 mm; linear density of lavsan threads is 10 to 20 tex. Proportion of fabric ingredients is as follows, mass percent: lavsan thread, 10-15; magnetically soft single threads, 20-25; binder (acrylic copolymers), 10-15; highly coercive alloy powder, 50-55.

EFFECT: enhanced radioactive radiation shielding efficiency of fabric.

1 cl, 1 tbl, 1 ex

FIELD: woven fabrics for magnetic systems and radioactive radiation shields.

SUBSTANCE: proposed ferromagnetic fabric characterized in enhanced strength and magnetic characteristics, ability of absorbing and dissipating electromagnetic radiation has warp, polymeric binder, and powdered ferromagnetic material. Fabric warp is made by linen weave method. Warp threads and shoot wires are made of alternating lavsan and magnetically soft single threads. Number of threads per meter is 5 000 to 7 000. Magnetically soft threads are made either of supermalloy or molybdenum permalloy with diameter measuring 0.05 to 0.1 mm; linear density of lavsan threads is 10 to 20 tex. Proportion of fabric ingredients is as follows, mass percent: lavsan thread, 10-15; magnetically soft single threads, 20-25; binder (acrylic copolymers), 10-15; highly coercive alloy powder, 50-55.

EFFECT: enhanced radioactive radiation shielding efficiency of fabric.

1 cl, 1 tbl, 1 ex

FIELD: metallurgy, namely treating of magnetically hard alloys on base of iron-chrome-cobalt system.

SUBSTANCE: method comprises steps of heat treatment due to realizing homogenization, quenching, thermo-magnetic treatment and multi-stage tempering for providing maximum magnetic hysteresis parameters. After multi-stage tempering plastic deformation by shearing is realized in condition of hydrostatic pressure.

EFFECT: production of magnetically hard alloy with high level of magnetic properties and sufficient ductility degree.

1 tbl

FIELD: powder metallurgy; navigation equipment and aircraft automation systems.

SUBSTANCE: proposed magnetic material designed for producing permanent magnets based on rare-earth element with metals of iron group has in its composition iron, cobalt, boron, and at least one element of terbium, dysprosium, holmium, erbium, thulium group, as well as cerium and gadolinium, and at least one element of samarium, lanthanum, neodymium, yttrium, and praseodymium group, formula of this chemical composition being as follow, atom percent: (Ce1 - x1 - x2- x3R1x1 x3R2x2GDx3)14-20(Fe1 - yCoy1)rB4 - 10, where R1 is at least one element of Tb, Dy, Ho, Er, Tm group; R2 is at least one element of Sm, La, Nd, Y, Pr group, where x1 = 0.2 - 0.5; y1 = 0.2 - 0.3, x2 and x3 are chosen considering following conditions: x1 + x2 + x3 = 0.75 - 0.99; x3/x1 ≥ 0.01.

EFFECT: enhanced residual magnetic flux density and temperature stability of material, extended range of magnet sizes.

3 cl, 1 tbl, 5 ex

FIELD: metallurgy, namely manufacture of microcrystalline magnetostrictive belt from alloy on base of iron-aluminum system.

SUBSTANCE: method comprises steps of melting alloy on base of iron-aluminum system, said alloy contains aluminum, 7 - 14% and carbon, 0.04 - 0.1%; casting melt at temperature of melt discharging 1755 - 1800°C at initial specific pressure 0.35 - 0.4 t/cm2 at rapid quenching 106 - 107°C/s; then performing electroplastic rolling at using electric current 50 000 A/mm2 with reduction value up to 30% for making belt with thickness 0.2 mm; subjecting belt to high-temperature annealing 1150 -1200°C for 1 - 2 h at heating rate 20° C/min and at further cooling at rate 100° C/min till 600°C and then at rate 50°C/h till 400°C. Such method allows increase saturation magnetostriction in comparison with prototype from 70 x 10 -6 λS till 90 x 10-6 λS that is by 28%. Such magnetostrictive materials are similar to magnetrostrictive materials on base of nickel, iron-cobalt alloys.

EFFECT: increased magnetostriction parameter of belt material.

1 ex, 1 tbl

FIELD: magnetic liquid production; synthesizing main component of magnetic liquid iron phase (highly dispersed magnetite) from etching and electroplating process wastes.

SUBSTANCE: proposed method for producing magnetic liquid includes mixing of hydrochloric solution of electroplating process slug sediment and spent etching solution in Fe3+/Fe2+ = 3 : 2 proportion, production of magnetite slurry for which purpose mixture of solutions is peptized by adding 28% ammonium hydroxide and co-precipitation of bivalent and trivalent ferric oxides and their interaction, coating of magnetite particle surfaces in aqueous medium with adsorbing layer of stabilizing agent, heating of slurry of magnetic particles incorporating stabilizing agent layer adsorbed therein, their separation from water phase and mixing with other-than-water carrying liquid. Upon co-precipitation bivalent and trivalent iron slurry is exposed to 50-Hz variable magnetic field.

EFFECT: enhanced magnetic characteristics of magnetic liquid.

1 cl, 1 tbl, 5 ex

FIELD: metallurgy.

SUBSTANCE: proposed sensor component that uses axial symmetry to impart magnetic properties to materials has magnetic material in the form of nanomagnets whose sides measure 40 - 500 nm and thickness is 3 - 10 nm; they function as zero-hysteresis superparamagnetic components.

EFFECT: use of configurational anisotropy through component symmetry to set magnetic properties and to ensure zero hysteresis.

3 cl, 8 dwg

FIELD: nonferrous metallurgy.

SUBSTANCE: invention, in particular, relates to cobalt-based precision alloys, which can be used to manufacture high-strength amorphous materials in the form of bands with high value of magnetic permeability. Amorphous magnetically soft cobalt-based alloy is provided containing, atomic %: iron 1.8-4, nickel 6.2-8, boron 8-10, silicon 10-12, cerium 0.6-1.2, yttrium 0.2-0.8, chromium 2-3.5, zirconium 0.5-1.5, and cobalt - the balance.

EFFECT: improved strength characteristics with high magnetic properties preserved.

5 cl, 1 dwg, 1 tbl

FIELD: woven fabrics for magnetic systems, radioactive radiation shields, biologic process stimulation in living organisms.

SUBSTANCE: proposed highly coercive fabric is, essentially, reticular structure of linen weave of polyamide warp threads and shoot wires, and combination of acrylic copolymers and highly coercive neodymium-iron-boron alloy powder; linear density of warp threads and shoot wires is 20 to 100 tex, and their quantity per meter is 1 500 to 6 500, proportion of ingredients being as follows, mass percent: polyamide threads, 10-50; acrylic copolymers, 15-25, highly coercive neodymium-iron-boron alloy powder, 65-35.

EFFECT: enhanced flexibility and ergonomic efficiency, facilitated manufacture.

1 cl, 1 tbl, 3 ex

Up!