CN108122669B - Processing method of magnetic material for electromagnetic shielding - Google Patents
Processing method of magnetic material for electromagnetic shielding Download PDFInfo
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- CN108122669B CN108122669B CN201711122838.8A CN201711122838A CN108122669B CN 108122669 B CN108122669 B CN 108122669B CN 201711122838 A CN201711122838 A CN 201711122838A CN 108122669 B CN108122669 B CN 108122669B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
Abstract
The invention discloses a processing method of a magnetic material for electromagnetic shielding, which comprises the steps of winding a soft magnetic alloy magnetic material strip into a soft magnetic alloy magnetic material circular ring, and installing the soft magnetic alloy magnetic material circular ring into a heat treatment furnace; then, after the heat treatment furnace is vacuumized, protective gas is filled in the heat treatment furnace, the temperature is raised, then the furnace is kept at the temperature, a longitudinal magnetic field and a transverse magnetic field are applied to the magnetic material through alternating pulse current A, B, and finally cooling is carried out; after the soft magnetic alloy magnetic material circular ring after heat treatment is bonded on double-sided adhesive with a PET substrate to form a film-coated magnetic material strip, the film-coated magnetic material strip is crushed by an ultrasonic vibration roller to form a soft magnetic alloy rolling strip, and finally, a plurality of soft magnetic alloy rolling strips and a plurality of double-sided adhesive tapes are alternately laminated and compressed to form a soft magnetic alloy composite laminated strip with a sandwich structure. The magnetic material processed by the processing method has the advantages of high and constant magnetic conductivity, good frequency and temperature stability, low high-frequency eddy current loss, high electromagnetic transmission conversion efficiency and the like.
Description
Technical Field
The invention belongs to the field of wireless power transmission and electromagnetic shielding application of magnetic materials in power electronic magnetic elements, and particularly relates to a processing method of magnetic materials for electromagnetic shielding.
Background
In recent years, with the popularization of smart phones, digital cameras, tablet computers and other small portable mobile devices, people have more and more abundant lives. Since the electronic devices have increasingly powerful functions and the power consumption thereof has increased, frequent charging is required to maintain their normal use. However, the charging process of the traditional electronic equipment is completed through a set of charger and data line, so that the charging interface, the charger and the data line of the traditional electronic equipment are complicated, the interfaces are not uniform, the data line and the interfaces are easily damaged by frequent plugging, and great troubles are brought to the work and life of people. If the electronic equipment adopts the wireless charging technology, a large number of chargers and data lines can be saved, the problem of resource waste is solved, meanwhile, the problem that interfaces of different electronic equipment can not be compatible at present can be solved, and great convenience is brought to work, life and travel of people.
The wireless charging technology is a technology for transmitting electric energy from a power supply transmitting end coil (above 100 kHz) to a power receiving end coil and charging a battery of equipment. The charging efficiency and distance can be improved by increasing the current frequency of the power supply transmitting end coil, but the problem of electromagnetic wave heating on the device battery and the surrounding metal parts is also caused. The conventional solution is to place a magnetic shielding sheet made of a high magnetic permeability material between the back of the coil and the battery to provide a magnetic conduction channel for electromagnetic waves emitted by the coil at the power supply transmitting end when the device is wirelessly charged, so as to reduce the eddy current influence of the penetration of the electromagnetic waves on the battery and other parts of the device around the battery, and the eddy current effect can convert electric energy into heat energy to be lost, thereby reducing the induced current of the receiving coil. When the current frequency is higher, the eddy current is larger, the lost energy source is larger, and the wireless charging efficiency is lower. In addition, when the current of wireless charging is great, the magnetism isolating sheet on the back of the coil may be saturated, once the magnetism isolating sheet is abnormal, the electromagnetic wave emitted by the wireless charging coil can penetrate through the magnetism isolating sheet and enter the battery of the device and the metal around the battery of the device, so that a serious heating effect is generated, and finally the wireless charging efficiency is reduced. In order to reduce eddy current loss and prevent supersaturation abnormality, an amorphous nanocrystalline magnetically soft alloy material with high saturation magnetic induction (0.8-2.0T), low loss and the like is generally selected to be used as a wireless charging magnetism-isolating sheet. However, the material is limited by its chemical composition, physical characteristics and applicable frequency, so that the conventional amorphous nanocrystalline soft magnetic alloy material cannot meet the application requirement of high-frequency current (above 100 kHz). In order to meet the requirements of high-frequency applications, the soft magnetic alloy sheet and the block are generally processed by a special processing technology (a magnetic field processing technology or a mechanical fragmentation technology).
(1) The magnetic field treatment process (transverse magnetic field, longitudinal magnetic field or rotating magnetic field, etc.) can make the magnetic moment distribution direction (perpendicular to the magnetic material plane) in the magnetic domain of the crystal grain of the soft magnetic alloy magnetic material perpendicular to the magnetization direction, increase the magnetic anisotropy constant, make the magnetic material have the permanent magnetic conductivity, thus improve the high-frequency characteristic and temperature stability of the magnetic material, in addition can also strengthen the heavy current resistant characteristic of the magnetic material, greatly improve the power characteristic of the magnetic material in electromagnetic application.
(2) The mechanical impact fragmentation process mainly comprises the steps of mutually extruding soft magnetic alloy magnetic materials by machines (plane pressing plates or steel balls) with fine sharp needle pricks on the surfaces and decomposing the soft magnetic alloy magnetic materials into a series of fine alloy particles, so that the purpose of magnetic material fragmentation is achieved. However, the soft magnetic alloy magnetic material is an isotropic material and has excellent physical and mechanical properties such as toughness and hardness, and after heat treatment, the soft magnetic alloy magnetic material has certain brittleness. Therefore, based on the special mechanical property of the soft magnetic alloy magnetic material, the soft magnetic alloy magnetic material can be fragmented into a magnetic material consisting of a series of small and fine particles through the traditional mechanical impact fragmentation process after being embrittled through heat treatment, the magnetic resistance of the tiny alloy particles is very large due to the influence of cracks, the skin effect of the tiny alloy particles is reduced, the frequency stability of the magnetic conductivity is greatly enhanced, and the high-frequency property of the tiny alloy particles is obviously enhanced. The mechanical impact fragmentation process has the advantages of simple process, easy operation and low processing cost, but most of the fragmented particles are flaky particles with irregular, rough surface and uneven size, and the defects of uncontrollable microstructure such as a large amount of particles and fragments with larger size locally and even abnormal local fragment dropping holes occur. The microstructure abnormality can cause a magnetic flux leakage phenomenon under the condition of a high-frequency electromagnetic field, the eddy current effect inside large-size scale particles is large, the magnetic loss of the whole magnetic sheet is uneven, the local heating is serious, the performance consistency is poor, the magnetic isolation effect of electromagnetic shielding can be reduced under the application conditions of wireless charging and the like, the high-frequency loss is large, the charging efficiency is low, and even the battery and metal electronic components on the back side generate heat abnormally.
Therefore, how to arrange the magnetic moment direction of the internal magnetic domain of the soft magnetic alloy magnetic material to be perpendicular to the magnetization direction of the magnetic material plane, and break the magnetic moment direction into a series of fine and uniform tiny particles on the surface of the external structure layer becomes a difficult problem which needs to be solved urgently in the application of the current high-frequency electromagnetic shielding sheet.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a processing method of a magnetic material for electromagnetic shielding, and the magnetic material processed by the novel processing technology has the advantages of higher and constant magnetic conductivity, good frequency and temperature stability, low high-frequency eddy current loss, high electromagnetic transmission conversion efficiency and the like.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a processing method of a magnetic material for electromagnetic shielding comprises the following steps:
step 1) winding and processing the soft magnetic alloy magnetic strip into a soft magnetic alloy magnetic ring with a certain inner and outer diameter specification size through a die;
step 2) a special charging frame is adopted in the step, and comprises a plurality of vertically placed cylindrical tubes, two ends of each cylindrical tube are respectively fixed on two ceramic fixing supports, the end parts of two ends of each cylindrical tube are respectively penetrated into round holes of two copper plates to be in parallel contact, and copper binding posts which can be connected with wiring buckles with alternating pulse current A on the hearth wall of a nonmagnetic stainless steel hearth are respectively led out of the two copper plates;
sequentially penetrating the wound soft magnetic alloy magnetic material rings into the cylindrical tube of a charging frame side by side, then placing the charging frame provided with the soft magnetic alloy magnetic material rings into a nonmagnetic stainless steel hearth, and ensuring that two copper binding posts of the charging frame are in good contact with a wiring buckle of alternating pulse current A on the wall of the nonmagnetic stainless steel hearth so as to enable the cylindrical tube to generate a longitudinal magnetic field; in addition, circulating cooling water is introduced into a hollow spiral copper pipe wound outside the nonmagnetic stainless steel hearth, and two ends of the hollow spiral copper pipe are respectively connected with an alternating pulse current B copper binding post, so that the hollow spiral copper pipe generates a transverse magnetic field, and a furnace door of the heat treatment furnace is closed after all the preparation works are finished;
the special charging frame structure adopted in the link can ensure that the applied external magnetic field can fully act on the magnetic domain in the magnetic material, and can ensure that each magnetic material does not generate interference influence because of the magnetization process, and in the heating process, the heat transfer channel of the magnetic material is increased, so that the inert gas atmosphere in the heat treatment furnace can generate convection heat transfer effect on the magnetic material, and the performance of the magnetic material can be ensured to be more uniform and stable;
step 3) carrying out pre-vacuumizing on the heat treatment furnace by using a vacuumizing valve and a vacuum pump, keeping the vacuum pressure in the heat treatment at-0.05 to-0.1 MPa, and continuously vacuumizing for 10-120 min, then closing the vacuum valve and the vacuum pump, opening an air pipe inflation valve, filling protective gas into the heat treatment furnace, ensuring that the inert atmosphere pressure in the heat treatment furnace is 0-0.1 Mpa, closing the air pipe inflation valve, raising the temperature in the heat treatment furnace to 200-800 ℃, during the period, the alternating pulse current A and the alternating pulse current B are simultaneously started to apply a longitudinal magnetic field and a transverse magnetic field (or a rotating magnetic field) to act on the magnetic material through the cylindrical pipe and the hollow spiral copper pipe respectively, so that the magnetic moment distribution direction of the magnetic domain in the magnetic material is perpendicular to the strip surface of the magnetic material, and the heat preservation time is 0.5-4 h; after the heat preservation time is finished, closing a heating power supply and power supplies of the alternating pulse current A and the alternating pulse current B, cooling by an auxiliary cooling fan of the heat treatment furnace until the temperature is reduced to room temperature, opening a furnace door of the heat treatment furnace, and finishing the heat treatment process;
step 4) adhering the outer surface of the magnetically soft alloy magnetic ring after heat treatment to double-sided adhesive with a PET (polyethylene terephthalate) base material on the back surface, wherein the method specifically comprises the steps of drawing the magnetically soft alloy magnetic ring to spread the magnetically soft alloy magnetic ring, and then rolling the magnetically soft alloy magnetic ring through a pair of circular roller shafts to adhere the spread magnetically soft alloy magnetic strip to the double-sided adhesive with the PET base material to form a film-coated magnetic strip;
step 5) enabling the coated magnetic material strip to pass through a set of ultrasonic vibration rolling device, wherein the ultrasonic vibration rolling device comprises a crushing roller shaft, the surface of the crushing roller shaft is printed with corresponding grid pattern prints (including rectangle, parallelogram, taper, triangle, rhombus, thread and the like), a plane roller shaft or a flat plate is arranged below the crushing roller shaft, an ultrasonic vibration generator is arranged above the pressing roller shaft, and a bearing of the pressing roller shaft is connected with the ultrasonic vibration generator through an amplitude transformer;
in the ultrasonic vibration rolling device, an ultrasonic vibration generator drives a crushing roller shaft to vibrate at a high speed and a small amplitude on the surface of a film-coated magnetic material strip through an amplitude transformer, ultrasonic energy is uniformly transmitted to the upper surface and the lower surface of the film-coated magnetic material strip, the film-coated magnetic material strip is crushed into a soft magnetic alloy rolling strip consisting of a series of scale particles with uniform shape distribution, clear edge cracks and smaller size (0.1-3 mm) under the action of high-speed ultrasonic vibration, and the crushed scale particles have no abnormal phenomena of tilting, deformation, holes, slice dropping and folding due to the action of high-speed ultrasonic vibration;
step 6) referring to fig. 4, alternately laminating and pressing n soft magnetic alloy rolled strips subjected to ultrasonic vibration rolling and crushing and (n-1) double-sided adhesive tapes with PET base materials into a soft magnetic alloy composite laminated strip with a sandwich structure under the rolling action of a pair of round roller shafts, wherein n is a positive integer and is less than 20; in the sandwich structure of the soft magnetic alloy composite laminated strip, the double-sided adhesive tape is adhered between the upper soft magnetic alloy rolling strip and the lower soft magnetic alloy rolling strip, small particle edge cracks on the soft magnetic alloy rolling strip are completely filled with the double-sided adhesive tape, and air in the cracks is completely extruded out of the double-sided adhesive tape to greatly reduce the noise vibration effect of the magnetic material in the electromagnetic environment.
Further, in the step 1), the soft magnetic alloy magnetic strip is an amorphous nanocrystalline alloy steel strip or a soft magnetic electrical alloy steel strip.
Preferably, the amorphous nanocrystalline alloy steel strip is a Fe-based amorphous nanocrystalline alloy steel strip or a Co-based/FeNi-based amorphous nanocrystalline alloy steel strip.
Further, in step 2), the inner diameter of the soft magnetic alloy magnetic material ring is slightly larger than the outer diameter of the cylindrical tube.
Further, in the step 2), the soft magnetic alloy magnetic material rings arranged side by side on the same cylindrical pipe have a certain distance with each other.
Further, in the step 3), the current value of the alternating pulse current A is 0-5000A, and the current value of the alternating pulse current B is 0-500A.
Further, in the step 3), the protective gas is H2、N2Or in ArOne of (1) and (b).
Further, in the step 5), the amplitude of the high-speed small-amplitude vibration of the crushing roller shaft on the surface of the film-coated magnetic material strip is 0-0.5 mm.
Further, in the step 5), the ultrasonic vibration frequency of the ultrasonic vibration generator is 15-100 kHz.
The invention has the beneficial effects that:
the innovation point of the invention is that the process method of heat treatment under the combined action of applying a longitudinal magnetic field and a transverse magnetic field by adopting a pre-vacuum and inert gas atmosphere environment is adopted, so that the magnetic moment distribution direction of the magnetic domain in the soft magnetic alloy magnetic material is perpendicular to the surface of the magnetic material. The beneficial result of the process is that the magnetic material has the characteristics of high and constant conductivity, good frequency and temperature stability, low high-frequency eddy current loss, high electromagnetic transmission conversion efficiency and the like.
The other important innovation point of the invention is that ultrasonic vibration is applied to the press roll shaft with the embossing patterns on the surface, and ultrasonic energy is uniformly transmitted to the magnetic material through the transmission effect of the press roll shaft so as to decompose the magnetic material into a series of magnetic materials consisting of fine and uniformly distributed particles.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic structural view of a heat treatment charging stand for generating a longitudinal magnetic field for a soft magnetic alloy magnet according to the present invention;
FIG. 2 is a schematic view of a heat treatment furnace and a coil structure for generating a transverse magnetic field for a soft magnetic alloy magnet according to the present invention;
FIG. 3 is a schematic view of the process of coating and fragmenting the soft magnetic alloy strip in the treatment process of the present invention;
FIG. 4 is a schematic view of a lamination process of multiple laminated magnetic strips in the process of the present invention;
FIG. 5 is a schematic structural view of a composite laminated strip of soft magnetic alloy processed according to the present invention;
FIG. 6a is a diagram showing the effect of cracks on the surface of the soft magnetic alloy before being crushed by ultrasonic rolling;
FIG. 6b is a diagram showing the effect of cracks on the surface of the soft magnetic alloy after being crushed by ultrasonic roller.
The reference numbers in the figures illustrate: 1. a soft magnetic alloy magnetic material ring; 2. a round copper pipe; 3. a ceramic support; 4. a copper plate; 5. a copper binding post; 6. a non-magnetic stainless steel hearth; 7. a hollow spiral copper tube; 8, 8-1 to 8- (n-1) double-sided adhesive tape; 10. a round roller shaft; 11. coating a magnetic material strip; 12. an amplitude transformer; 13. an ultrasonic generator; 14. a reducing roll shaft; 15. a plane roller shaft; 16. ultrasonic vibration rolling device; 17, 17-1 to 17-n, rolling the soft magnetic alloy strip; 18. soft magnetic alloy composite laminated strips.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
A processing method of a magnetic material for electromagnetic shielding comprises the following steps:
step 1) winding and processing a soft magnetic alloy magnetic strip into a soft magnetic alloy magnetic ring 1 with a certain inner and outer diameter specification size through a die; the soft magnetic alloy magnetic material strip is an amorphous nanocrystalline alloy steel strip or a soft magnetic electrical alloy steel strip; preferably, the amorphous nanocrystalline alloy steel strip is a Fe-based amorphous nanocrystalline alloy steel strip or a Co-based/FeNi-based amorphous nanocrystalline alloy steel strip;
step 2) as shown in fig. 1, a special charging frame is adopted in the step, and the special charging frame comprises a plurality of vertically placed cylindrical tubes 2, the outer diameter of each cylindrical tube 2 is slightly smaller than the inner diameter of the soft magnetic alloy magnetic material ring 1, two ends of each cylindrical tube 2 are respectively fixed on two ceramic fixing supports 3, the end parts of two ends of each cylindrical tube 2 are respectively penetrated into round holes of two copper plates 4 to be in parallel contact, and a copper binding post 5 which can be connected with a wiring buckle with alternating pulse current A on the hearth wall of a non-magnetic stainless steel hearth 6 is respectively led out from the two copper plates 4;
sequentially penetrating the wound soft magnetic alloy magnetic material circular rings 1 into the cylindrical tubes 2 of a charging frame side by side, arranging the soft magnetic alloy magnetic material circular rings 1 on the same cylindrical tube 2 side by side with a certain distance between each other, then placing the charging frame provided with the soft magnetic alloy magnetic material circular rings 1 into a nonmagnetic stainless steel hearth 6, and ensuring that two copper binding posts 5 of the charging frame are in good contact with a wiring buckle of an alternating pulse current A on the nonmagnetic stainless steel hearth 6 so as to enable the cylindrical tubes 2 to generate a longitudinal magnetic field; in addition, referring to fig. 2, circulating cooling water is introduced into the hollow spiral copper tube 7 wound outside the nonmagnetic stainless steel furnace 6, and two ends of the hollow spiral copper tube 7 are respectively connected to alternating pulse current B copper binding posts, so that the hollow spiral copper tube 7 generates a transverse magnetic field, and the furnace door of the heat treatment furnace is closed after all the preparation works are finished;
the special charging frame structure adopted in the link can ensure that the applied external magnetic field can fully act on the magnetic domain in the magnetic material, and can ensure that each magnetic material does not generate interference influence because of the magnetization process, and in the heating process, the heat transfer channel of the magnetic material is increased, so that the inert gas atmosphere in the heat treatment furnace can generate convection heat transfer effect on the magnetic material, and the performance of the magnetic material can be ensured to be more uniform and stable;
step 3, pre-vacuumizing the heat treatment furnace by using a vacuumizing valve and a vacuum pump, keeping the vacuum pressure in the heat treatment at-0.05 to-0.1 MPa, and continuously vacuumizing for 10-120 min, and thenClosing the vacuum valve and the vacuum pump, opening the gas pipe inflation valve, and filling protective gas (H) into the heat treatment furnace2、N2Or Ar) is adopted, the inert atmosphere pressure in the heat treatment furnace is ensured to be 0-0.1 Mpa, then the gas pipe inflation valve is closed, the temperature in the heat treatment furnace is increased to 200-800 ℃, in the period, the alternating pulse current A (0-5000A) and the alternating pulse current B (0-500A) are simultaneously started to respectively apply a longitudinal magnetic field and a transverse magnetic field (or a rotating magnetic field) to act on the magnetic material through the cylindrical pipe 2 and the hollow spiral copper pipe 7, so that the magnetic moment arrangement direction of the magnetic domain in the magnetic material is perpendicular to the strip surface of the magnetic material, and the heat preservation time is 0.5-4 h; after the heat preservation time is finished, closing a heating power supply and power supplies of the alternating pulse current A and the alternating pulse current B, cooling by an auxiliary cooling fan of the heat treatment furnace until the temperature is reduced to room temperature, opening a furnace door of the heat treatment furnace, and finishing the heat treatment process;
step 4) adhering the outer surface of the magnetically soft alloy magnetic ring 1 subjected to heat treatment to a double-sided adhesive tape 8 with a PET (polyethylene terephthalate) substrate on the back surface, wherein the specific steps are as shown in figure 3, the magnetically soft alloy magnetic ring 1 is stretched by drawing and then passes through a pair of circular roller shafts 10 for rolling action, so that the spread magnetically soft alloy magnetic strip is adhered to the double-sided adhesive tape 8 with the PET substrate, and a film-coated magnetic strip 11 is formed;
step 5, referring to fig. 3, the coated magnetic material strip 11 passes through a set of ultrasonic vibration rolling device 16, the ultrasonic vibration rolling device 16 comprises a crushing roller shaft 14, the surface of the crushing roller shaft 14 is printed with corresponding grid patterns comprising rectangles, parallelograms, cones, triangles, rhombuses, threads and the like, a plane roller shaft 15 or a flat plate is arranged below the crushing roller shaft 14, an ultrasonic vibration generator 13 is arranged above the pressing roller shaft 14, and a bearing of the pressing roller shaft 14 is connected with the ultrasonic vibration generator 13 through an amplitude transformer 12;
in the ultrasonic vibration rolling device 16, the ultrasonic vibration frequency of the ultrasonic vibration generator 13 is 15-100 kHz, the ultrasonic vibration generator 13 drives the fragmentation roller shaft 14 to vibrate at a high speed and a small amplitude (the amplitude is 0-0.5 mm) on the surface of the film-coated magnetic material strip 11 through the amplitude transformer 12, ultrasonic energy is uniformly transmitted to the upper surface and the lower surface of the film-coated magnetic material strip 11, and under the action of high-speed ultrasonic vibration, the film-coated magnetic material strip 11 is broken into a soft magnetic alloy rolling strip 17 consisting of a series of scale particles which are uniformly distributed in shape, clear in edge cracks and finer in size (0.1-3 mm); as shown in fig. 6, due to the action of the high-speed ultrasonic vibration, the broken scale particles have no abnormal phenomena of tilting, deformation, holes, chipping and creasing;
step 6) referring to fig. 4, alternately laminating and compacting n soft magnetic alloy rolled strips 17-1-17-n and (n-1) double-sided tapes 8-1-8- (n-1) with PET base materials into a soft magnetic alloy composite laminated strip 18 with a sandwich structure under the rolling action of a pair of circular roll shafts 10, wherein n is a positive integer and is less than 20; referring to fig. 5, in the sandwich structure of the soft magnetic alloy composite laminated strip 18, the double faced adhesive tapes 8-1-8- (n-1) are adhered between the upper and lower adjacent soft magnetic alloy rolled strips 17-1-17-n, fine particle edge cracks on the soft magnetic alloy rolled strips 17-1-17-n are completely filled with the double faced adhesive tapes 8-1-8- (n-1), and air in the cracks is completely extruded out of the soft magnetic alloy rolled strips 17-1-17-n by the double faced adhesive tapes 8-1-8- (n-1), so that the noise vibration effect of the magnetic material in the electromagnetic environment is greatly reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A processing method of magnetic materials for electromagnetic shielding is characterized in that firstly, soft magnetic alloy magnetic material strips are wound into a soft magnetic alloy magnetic material circular ring, the soft magnetic alloy magnetic material circular ring is installed on a loading frame in a nonmagnetic stainless steel hearth, and an alternating pulse current A and an alternating pulse current B are connected; then after the heat treatment furnace is continuously vacuumized for a period of time, filling protective gas into the heat treatment furnace and heating, keeping the furnace temperature and respectively applying a longitudinal magnetic field and a transverse magnetic field to the magnetic material through the alternating pulse current A and the alternating pulse current B so that the magnetic moment arrangement direction of the magnetic domain in the magnetic material is perpendicular to the strip surface of the magnetic material, and after the heat preservation time is over, cooling the heat treatment furnace; the method comprises the following steps of bonding the outer surface of a soft magnetic alloy magnetic material ring after heat treatment on double-sided adhesive with a PET (polyethylene terephthalate) base material on the back to form a film-coated magnetic material strip, then carrying out ultrasonic vibration rolling and crushing on the film-coated magnetic material strip, crushing the film-coated magnetic material strip into a soft magnetic alloy rolling strip which is formed by a series of uniformly distributed shapes, clear in edge cracks and smaller in size, and finally laminating the soft magnetic alloy rolling strip and the double-sided adhesive alternately with the PET base material to form a soft magnetic alloy composite laminated strip with a sandwich structure.
2. The method for processing a magnetic material for electromagnetic shielding according to claim 1, comprising the steps of:
step 1) winding a soft magnetic alloy magnetic strip into a soft magnetic alloy magnetic ring (1) with a certain inner and outer diameter specification size through a die;
step 2), sequentially penetrating the wound soft magnetic alloy magnetic material rings (1) into a cylindrical tube (2) of a charging frame side by side, then placing the charging frame provided with the soft magnetic alloy magnetic material rings (1) into a nonmagnetic stainless steel hearth (6), and ensuring that two copper binding posts (5) of the charging frame are in good contact with a wiring buckle of alternating pulse current A on the hearth wall of the nonmagnetic stainless steel hearth (6), so that the cylindrical tube (2) generates a longitudinal magnetic field; in addition, circulating cooling water is introduced into a hollow spiral copper pipe (7) wound outside the non-magnetic stainless steel hearth (6), and two ends of the hollow spiral copper pipe (7) are respectively connected with alternating pulse current B copper binding posts, so that the hollow spiral copper pipe (7) generates a longitudinal magnetic field, and a furnace door of the heat treatment furnace is closed after all the preparation works are finished;
step 3) carrying out pre-vacuumizing on the heat treatment furnace by using a vacuumizing valve and a vacuum pump, keeping the vacuum pressure in the heat treatment furnace at-0.05 to-0.1 MPa, and continuously vacuumizing for 10-120 min, then closing the vacuum pumping valve and the vacuum pump, opening an air pipe inflation valve, filling protective gas into the heat treatment furnace, ensuring that the inert atmosphere pressure in the heat treatment furnace is 0-0.1 Mpa, closing the air pipe inflation valve, raising the temperature in the heat treatment furnace to 200-800 ℃, during the period, the alternating pulse current A and the alternating pulse current B are simultaneously started to apply a longitudinal magnetic field and a transverse magnetic field to act on the magnetic material through the cylindrical pipe (2) and the hollow spiral copper pipe (7) respectively, so that the magnetic moment distribution direction of the magnetic domain in the magnetic material is perpendicular to the strip surface of the magnetic material, and the heat preservation time is 0.5-4 h; after the heat preservation time is finished, closing a heating power supply and power supplies of the alternating pulse current A and the alternating pulse current B, cooling by an auxiliary cooling fan of the heat treatment furnace until the temperature is reduced to room temperature, opening a furnace door of the heat treatment furnace, and finishing the heat treatment process;
step 4), adhering the outer surface of the magnetically soft alloy magnetic material circular ring (1) after heat treatment to a double-sided adhesive tape (8) with a PET substrate on the back surface, wherein the method comprises the specific steps of stretching the magnetically soft alloy magnetic material circular ring (1), spreading the magnetically soft alloy magnetic material circular ring, passing through a pair of circular roller shafts (10) for rolling, and adhering the spread magnetically soft alloy magnetic material strips to the double-sided adhesive tape (8) with the PET substrate to form a film-coated magnetic material strip (11);
step 5) enabling the film-coated magnetic material strip (11) to pass through a set of ultrasonic vibration rolling device (16), wherein in the ultrasonic vibration rolling device (16), an ultrasonic vibration generator (13) drives a smashing roller shaft (14) to vibrate on the surface of the film-coated magnetic material strip (11) at a high speed and in a small amplitude through an amplitude transformer (12), ultrasonic energy is uniformly transmitted to the upper surface and the lower surface of the film-coated magnetic material strip (11), under the action of high-speed ultrasonic vibration, the film-coated magnetic material strip (11) is broken into a soft magnetic alloy rolling strip (17) which is composed of a series of scale particles with uniform shape distribution, clear edge cracks and finer sizes, and due to the action of high-speed ultrasonic vibration, the broken scale particles have no abnormal phenomena of warping, deformation, holes, slice falling and corrugation;
step 6) alternately laminating and compacting n soft magnetic alloy rolled strips (17-1-17-n) subjected to ultrasonic vibration rolling and crushing and n-1 double-sided adhesive tapes (8-1-8- (n-1) with PET (polyethylene terephthalate) base materials into a soft magnetic alloy composite laminated strip (18) with a sandwich structure under the rolling action of a pair of round roll shafts (10), wherein n is a positive integer and is less than 20; in the sandwich structure of the soft magnetic alloy composite laminated strip (18), fine particle edge cracks on the soft magnetic alloy rolling strip (17-1-17-n) are completely filled with the double faced adhesive tape (8-1-8- (n-1)), and air in the cracks is completely extruded out of the soft magnetic alloy rolling strip (17-1-17-n) by the double faced adhesive tape (8-1-8- (n-1)), so that the noise vibration effect of a magnetic material in an electromagnetic environment is greatly reduced.
3. The method for processing a magnetic material for electromagnetic shielding according to claim 2, comprising: in the step 1), the soft magnetic alloy magnetic strip is an amorphous nanocrystalline alloy steel strip or a soft magnetic electrical alloy steel strip.
4. The method for processing a magnetic material for electromagnetic shielding according to claim 3, comprising: the amorphous nanocrystalline alloy steel strip is a Fe-based amorphous nanocrystalline alloy steel strip or a Co-based/FeNi-based amorphous nanocrystalline alloy steel strip.
5. The method for processing a magnetic material for electromagnetic shielding according to claim 2, comprising: in the step 2), the inner diameter of the soft magnetic alloy magnetic material circular ring (1) is slightly larger than the outer diameter of the cylindrical pipe (2).
6. The method for processing a magnetic material for electromagnetic shielding according to claim 2, comprising: in the step 2), the soft magnetic alloy magnetic material circular rings (1) which are arranged on the same cylindrical pipe (2) side by side have a certain distance with each other.
7. The method for processing a magnetic material for electromagnetic shielding according to claim 2, comprising: in the step 3), the current value of the alternating pulse current A is 0-5000A, and the current value of the alternating pulse current B is 0-500A.
8. The method for processing a magnetic material for electromagnetic shielding according to claim 2, comprising: in the step 3), the protective gas is H2、N2Or Ar.
9. The method for processing a magnetic material for electromagnetic shielding according to claim 1, comprising: in the step 5), the amplitude of the high-speed small-amplitude vibration of the crushing roller shaft (14) on the surface of the film-coated magnetic material strip (11) is 0-0.5 mm.
10. The method for processing a magnetic material for electromagnetic shielding according to claim 2, comprising: in the step 5), the ultrasonic vibration frequency of the ultrasonic vibration generator (13) is 15-100 kHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711122838.8A CN108122669B (en) | 2017-11-14 | 2017-11-14 | Processing method of magnetic material for electromagnetic shielding |
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| CN201711122838.8A CN108122669B (en) | 2017-11-14 | 2017-11-14 | Processing method of magnetic material for electromagnetic shielding |
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| CN108122669A CN108122669A (en) | 2018-06-05 |
| CN108122669B true CN108122669B (en) | 2019-12-24 |
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| CN110098043B (en) * | 2019-01-30 | 2022-11-22 | 宁波中科毕普拉斯新材料科技有限公司 | Preparation method of controllable array type wireless charging magnetic conductive sheet |
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