CN111986908A - Low-cost forced assembly permanent magnet conductive contact and manufacturing method thereof - Google Patents
Low-cost forced assembly permanent magnet conductive contact and manufacturing method thereof Download PDFInfo
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- CN111986908A CN111986908A CN202010067618.5A CN202010067618A CN111986908A CN 111986908 A CN111986908 A CN 111986908A CN 202010067618 A CN202010067618 A CN 202010067618A CN 111986908 A CN111986908 A CN 111986908A
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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
- H01F41/0253—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 for manufacturing permanent magnets
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- H—ELECTRICITY
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
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Abstract
The invention discloses a low-cost forced assembly permanent magnet conductive contact and a manufacturing method thereof, wherein the permanent magnet conductive contact consists of three parts: the coil comprises a fixed sleeve, a core body and a coil, wherein the core body is a composite core body which is prepared by taking 6-8 parts by weight of lanthanum, 3.5-4.5 parts by weight of cerium, 0.05100-110 parts by weight of ferroboron FeB22C0.05100 and 5-7 parts by weight of yttrium as raw materials, mixing and smelting the raw materials to obtain an alloy as a magnetic material, taking ethylene-vinyl acetate copolymer as a base material, integrating and curing the base material and taking pure copper as a shell, and the composite core body is sleeved in the fixed sleeve; the coil is formed by winding aniline modified carbon fiber aluminum core composite wires wound on the surface of the core body, and the coil is wound on the inner surface of the fixed sleeve. The invention has compact grids, low cost, high magnetic energy product, high Curie temperature and good thermal stability, and only uses abundant rare earth.
Description
Technical Field
The invention relates to the technical field of electric devices, in particular to a low-cost compulsory assembly permanent magnet conductive contact and a manufacturing method thereof.
Background
The nano composite permanent magnetic material consists of a nano-scale soft magnetic phase and a nano-scale hard magnetic phase, theoretically has high maximum energy product, and is expected to be developed into a new generation of low-cost high-performance permanent magnetic material due to low rare earth content. However, the material is applied to high-cost rare earth Nd and the like in a large quantity, so that the cost is high and the popularization and application are difficult. The research on the magnetic energy product of the Nd-Fe-B single-phase permanent magnetic material reaches the bottleneck, and the defects of low Curie temperature, poor thermal stability, poor corrosion resistance, poor oxidation resistance and the like of the Nd-Fe-B single-phase permanent magnetic material are still overcome. The preparation of the new generation Sm2Fe17Nx single-phase permanent magnet material has not been developed in a breakthrough manner so far due to the difficulty in handling the components, the phase composition and the distribution thereof, so that the development of composite materials is the focus of attention of researchers. Theoretical research shows that the biphase nano composite permanent magnetThe magnetic material has high saturation magnetization of soft magnetic phase and high coercivity of hard magnetic phase, obvious remanence enhancement effect and theoretical magnetic energy product up to 1MJ/m3. The experimental results for many years show that although the remanence of the dual-phase nano composite permanent magnetic material is obviously improved, the coercive force is greatly reduced, the relationship of the length of the remanence is eliminated, so that the squareness of a demagnetization curve is poor, and the actual magnetic energy product is far lower than a theoretical value, so that the inter-crystal exchange coupling action mechanism of the dual-phase nano permanent magnetic material, the size and the volume fraction of soft/hard magnetic crystal grains, the coercive force mechanism and the tissue regulation and control method need to be deeply researched.
Conductive polymers can be divided into two broad categories depending on structure and composition: one is a polymer material which has a conductive function by itself or after being doped, and is called a structural conductive polymer material; the other type is a composite conductive polymer material which is a multi-phase composite material obtained by adding a certain amount of conductive substances or conductive polymers into a polymer material serving as a matrix and then compounding the materials by adopting a physical or chemical method, wherein the conductive substances form a continuous conductive network in the polymer matrix, so that an electrical function is realized. The structural conductive polymer material is generally not melted and dissolved due to the rigid conjugated double bond structure on the molecular main chain and the van der waals acting force between molecules, and the special physical properties cause the structural conductive polymer to have poor processability and poor environmental stability, so the application of the structural conductive polymer material is greatly limited. The conductive polymer matrix composite has the advantages of excellent processability, viscoelasticity and electrical properties of conductive substances of high polymer materials, and low density, adjustable resistivity, low cost and the like, so that the conductive polymer matrix composite is widely applied to the aspects of aerospace, household appliances, antistatic materials, radar wave-absorbing materials, electromagnetic shielding materials and the like, and social development is promoted.
Therefore, a low-cost compulsory assembly permanent magnet conductive contact with dense grids, low cost, high magnetic energy product, high Curie temperature and good thermal stability and a manufacturing method thereof are urgently needed in the market.
Disclosure of Invention
The invention aims to provide a manufacturing method of a low-cost forced assembly permanent magnet conductive contact, which has compact grids, low cost, high magnetic energy product, high Curie temperature and good thermal stability, and only uses abundant rare earth.
In order to achieve the purpose, the invention adopts the following technical scheme: a manufacturing method of a low-cost forced assembly permanent magnet conductive contact comprises the following steps:
1) raw material preparation
Preparing raw materials: preparing 500-600 parts of ethylene-vinyl acetate copolymer, 6-8 parts of metal lanthanum, 3.5-4.5 parts of cerium, 6-8 parts of ferroboron FeB22C0.05100-110 parts of yttrium, 5-7 parts of fixed sleeve, enough carbon fiber and aluminum core composite lead, 6-8 parts of pure copper powder, enough aniline and 0.2-0.5 part of ammonium persulfate initiator according to parts by weight;
preparing auxiliary materials: preparing enough components according to the volume ratio of 3: 1, mixing a mixed solution of concentrated sulfuric acid and concentrated nitric acid, enough 10% of hydrochloric acid aqueous solution with solute mass fraction, and enough argon;
2) preparation of magnetic powder
Firstly, under the protection of sufficient argon prepared in the step two of the stage 1), uniformly mixing lanthanum, cerium, ferroboron FeB22C0.05 and yttrium prepared in the step 1), then carrying out electroslag remelting smelting, and then cooling to room temperature along with a furnace to prepare a primary alloy blank;
and secondly, ball-milling the primary alloy blank obtained in the step I into alloy powder of 500-1000 meshes, smelting the alloy powder serving as a raw material by using a cylindrical silicon dioxide container as a mould and adopting a vacuum induction smelting furnace integrated with electromagnetic stirring equipment, wherein the smelting process comprises the following steps of: vacuumizing to 1X 10 before heating-2Pa-1×10-3Pa, timing when the raw materials begin to melt after the temperature is reached, starting electromagnetic stirring at the stirring speed of 100-250 rpm/min, keeping the temperature for 20-23 min, stopping heating, rapidly cooling by adopting nitrogen, discharging from the furnace, and demolding to obtain a rough magnetic core;
thirdly, the rough magnetic core obtained in the second step is 1 multiplied by 10-2Pa-1×10-3Annealing at 730-750 ℃ under Pa vacuum degree, and mechanically polishing the cylindrical surface and two end faces of the rough magnetic core obtained after annealing to remove the thickness of 0.3-0.5 mm to obtain a regular magnetic core;
fourthly, grinding the regular magnetic core obtained in the third step into powder of 1000-1500 meshes to obtain the required magnetic powder;
3) wire preparation
Completely immersing the carbon fiber aluminum core composite wire prepared in the step 1) in the mixed solution of concentrated sulfuric acid and concentrated nitric acid prepared in the step two in the step 1) for 3.5-4 h by adopting 200-250W ultrasonic treatment to obtain a carboxylated passivated composite wire, and then rinsing the composite wire by adopting clear water;
immersing the carboxylated passivated composite wire obtained in the step I into the hydrochloric acid aqueous solution prepared in the step II in the stage 1), immersing the hydrochloric acid aqueous solution into an ice bath at the temperature of minus 5 ℃ to minus 10 ℃, starting stirring at the speed of 120rpm/min to 150rpm/min, then putting aniline prepared in the step I in the stage 1), finally putting the ammonium persulfate initiator prepared in the step I in the stage 1) into the reaction solution at the mass speed of 10 percent/min, stirring for 40min to 50min, taking out the reaction solution, standing for 0.5 to 1 day in a refrigerator at the temperature of minus 5 ℃ to minus 10 ℃, filtering out a condensate, and respectively rinsing with ethanol and water until the condensate is rinsed to be clean to obtain the modified composite wire;
4) conductive contact formation
Putting the ethylene-vinyl acetate copolymer prepared in the step 1) in a vacuum box, heating to 40-45 ℃, and drying for 2 hours to obtain a matrix material;
secondly, mixing the base material obtained in the first step with the magnetic powder obtained in the fourth step in the stage 2), uniformly stirring, then carrying out internal mixing by adopting a double screw at a rotating speed of 45-50 rpm/min and a temperature of 78-83 ℃ for 12-15 min to obtain mixed homogeneous phase colloid, forcibly compressing the mixed homogeneous phase colloid to the size of the magnetic core required by design, and then cooling and solidifying to obtain the prefabricated magnetic core;
thirdly, heating the pure copper powder prepared in the step 1) to be molten, uniformly spraying the molten pure copper powder on the surface of the prefabricated magnetic core obtained in the step two, and then mechanically polishing the surface of the prefabricated magnetic core to obtain two end surfaces of the composite material to obtain the magnetic core to be finished
And fourthly, sleeving the finished magnetic core obtained in the third step as a movable structure in the fixed sleeve prepared in the first step in the step 1), cutting off the head and the tail of the modified composite wire obtained in the step 3), and winding the modified composite wire on the inner surface of the fixed sleeve to ensure that the modified composite wire is not in contact with the surface of the finished magnetic core, so that a composite core structure is obtained, and the composite core structure is the required low-cost forced assembly permanent magnet conductive contact.
A low-cost forced assembly permanent magnet conductive contact is composed of three parts: the coil comprises a fixed sleeve, a core body and a coil, wherein the core body is a composite core body which is prepared by taking 6-8 parts by weight of lanthanum, 3.5-4.5 parts by weight of cerium, 0.05100-110 parts by weight of ferroboron FeB22C0.05100 and 5-7 parts by weight of yttrium as raw materials, mixing and smelting the raw materials to obtain an alloy as a magnetic material, taking ethylene-vinyl acetate copolymer as a base material, integrating and curing the base material and taking pure copper as a shell, and the composite core body is sleeved in the fixed sleeve; the coil is formed by winding aniline modified carbon fiber aluminum core composite wires wound on the surface of the core body, and the coil is wound on the inner surface of the fixed sleeve.
Compared with the prior art, the invention has the following advantages: (1) compared with the prior art which focuses on researching the element proportion of the magnetic alloy, the cold deformation structure adjusting process for the specially-made magnetic core is researched by focusing on adjusting the structure state, the size and the proportional relation of the effective phase in the alloy, so that the cold deformation structure adjusting process for the specially-made magnetic core is researched through multiple researches and combining with production practice, and the purpose is to obtain the optimal grain size of 5nm-15nm of soft magnetic phase grains and 25nm-35nm of hard magnetic phase grains and the total volume of the soft magnetic phase: the total volume of the hard magnetic phase is close to 1: 1, which has never been noticed by the prior art. (2) Compared with the mainstream research of La, Ce and Y as substitute elements in Nd-Fe-B, the invention starts from the ternary La-Fe-B, Ce-Fe-B and Y-Fe-B alloy, and improves the hard magnetic performance and the temperature stability of the alloy by optimizing the components and utilizing the interaction between rare earth elements. By means of the addition of trace elements, the structure of the alloy is further optimized, and the coercive force of the alloy is improved. Based on the obtained ternary and multicomponent alloy components with high magnetic energy product, the La, Ce and Y-based rare earth permanent magnet without key rare earth elements is prepared by utilizing the rapidly quenched nanocrystalline magnetic powder produced in small batches. (3) The invention adopts a special magnetic core prepared by a grid dense pressure manufacturing assembly method, and performs space limited-area extrusion on a blending system, thereby exerting a forced assembly force which is far greater than a self-assembly acting force of the blending system on a dispersed phase, forcibly extruding polymers among magnetic particles, realizing the densification of a conductive network, and providing possibility for greatly improving the overall magnetic performance. The key of the method is that the blended self-assembly network is subjected to limited-domain compression, namely, a sample is compressed to be less than or equal to the average diameter dm of the network cable of the blended self-assembly network in at least one geometric dimension, so that the blended self-assembly network is forcibly compressed. The blended self-assembled network loses the freedom of oscillation, the magnetic particles on the network are more compact under the combined action of mutual agglomeration force and external load, and polymer fluid (melt) among the magnetic particles is easy to be squeezed away, so that the network is forcibly compacted. (4) The invention adopts special heat treatment parameters obtained through a great deal of basic research and long-term production practice on a specially-made magnetic core, and in the research, we find that if the heat treatment temperature higher than that of the invention is adopted, the magnetic phase crystal grains grow rapidly, the excessively coarse crystal grains weaken the ferromagnetic exchange coupling effect between magnetic phases, and the heat treatment temperature lower than that of the invention cannot obtain enough magnetic functional phases. (5) The invention actually obtains the surface pure copper contact and the integral permanent magnet contact, which not only has high magnetic induction but also is a good conductor, and takes the permanent magnet as a core and the pure copper as a shell, thereby not only obtaining excellent magnetic performance, but also avoiding the defect that the nano permanent magnet material is sensitive to stress, and simultaneously, the surface layer is toughened and resists impact, and the surface contact area is large. (6) The invention is a finger-shaped contact instead of a bridge-shaped contact, so that the problem of metal fatigue does not exist, only the impact damage and abrasion need to be considered, but the invention is not in the conventional technology, and the relatively soft permanent magnetic pure copper is added on the surface of the hard core body, thereby not only ensuring that the magnetic core cannot deform due to insufficient strength of the core body, but also protecting the impacted surface from being damaged, and establishing relatively flexible buffer between two hard bodies, and simultaneously promoting the contact surface, therefore, the invention has strong fatigue resistance. (7) All the materials adopted by the invention are high temperature resistant, because no tin soldering or resin and other non-high temperature resistant solidified materials are adopted, the carbon fiber which is not flame resistant and the aluminum core which is not corrosion resistant are passivated, protected by aniline adhesion and insulated with the core body, and simultaneously because of the aniline, the self-hydrophobicity performance of the coil is obtained, the application range is expanded, and the surface protection difficulty is reduced. Therefore, the invention has the characteristics of compact grid, low cost, high magnetic energy product, high Curie temperature and good thermal stability, and only uses abundant rare earth.
Detailed Description
Example 1:
a low-cost forced assembly permanent magnet conductive contact is composed of three parts: the coil comprises a fixed sleeve, a core body and a coil, wherein the core body is a composite core body which is obtained by taking pure copper as a shell and taking alloy mixed by taking 550g of ethylene-vinyl acetate copolymer, 7g of lanthanum, 4.2g of cerium, 7g of ferroboron FeB22C0.05107g and 5.8g of yttrium as raw materials in parts by weight as a core, and the composite core body is sleeved in the fixed sleeve; the coil is formed by winding aniline modified carbon fiber and aluminum core composite wires wound on the surface of the core body, and the coil is wound on the inner surface of the fixed sleeve; the manufacturing method of the permanent magnet conductive contact comprises the following steps:
1) raw material preparation
Preparing raw materials: preparing 550g of ethylene-vinyl acetate copolymer, 7g of pure copper powder, 7g of metal lanthanum, 4.2g of cerium, FeB22C0.05107g of ferroboron, 5.8g of yttrium, a fixed sleeve, sufficient carbon fiber and aluminum core composite wires, sufficient aniline and 0.2-0.5 g of ammonium persulfate initiator according to parts by weight;
preparing auxiliary materials: preparing enough components according to the volume ratio of 3: 1, mixing a mixed solution of concentrated sulfuric acid and concentrated nitric acid, enough 10% of hydrochloric acid aqueous solution with solute mass fraction, and enough argon;
2) preparation of magnetic powder
Firstly, under the protection of sufficient argon prepared in the step two of the stage 1), uniformly mixing lanthanum, cerium, ferroboron FeB22C0.05 and yttrium prepared in the step 1), then carrying out electroslag remelting smelting, and then cooling to room temperature along with a furnace to prepare a primary alloy blank;
and secondly, ball-milling the primary alloy blank obtained in the step I into alloy powder of 500-1000 meshes, smelting the alloy powder serving as a raw material by using a cylindrical silicon dioxide container as a mould and adopting a vacuum induction smelting furnace integrated with electromagnetic stirring equipment, wherein the smelting process comprises the following steps of: vacuumizing to 1X 10 before heating-2Pa-1×10-3Pa, timing when the raw materials begin to melt after the temperature is reached, starting electromagnetic stirring at the stirring speed of 100-250 rpm/min, keeping the temperature for 20-23 min, stopping heating, rapidly cooling by adopting nitrogen, discharging from the furnace, and demolding to obtain a rough magnetic core;
thirdly, the rough magnetic core obtained in the second step is 1 multiplied by 10-2Pa-1×10-3Annealing at 730-750 ℃ under Pa vacuum degree, and mechanically polishing the cylindrical surface and two end faces of the rough magnetic core obtained after annealing to remove the thickness of 0.3-0.5 mm to obtain a regular magnetic core;
fourthly, grinding the regular magnetic core obtained in the third step into powder of 1000-1500 meshes to obtain the required magnetic powder;
3) wire preparation
Completely immersing the carbon fiber aluminum core composite wire prepared in the step 1) in the mixed solution of concentrated sulfuric acid and concentrated nitric acid prepared in the step two in the step 1) for 3.5-4 h by adopting 200-250W ultrasonic treatment to obtain a carboxylated passivated composite wire, and then rinsing the composite wire by adopting clear water;
immersing the carboxylated passivated composite wire obtained in the step I into the hydrochloric acid aqueous solution prepared in the step II in the stage 1), immersing the hydrochloric acid aqueous solution into an ice bath at the temperature of minus 5 ℃ to minus 10 ℃, starting stirring at the speed of 120rpm/min to 150rpm/min, then putting aniline prepared in the step I in the stage 1), finally putting the ammonium persulfate initiator prepared in the step I in the stage 1) into the reaction solution at the mass speed of 10 percent/min, stirring for 40min to 50min, taking out the reaction solution, standing for 0.5 to 1 day in a refrigerator at the temperature of minus 5 ℃ to minus 10 ℃, filtering out a condensate, and respectively rinsing with ethanol and water until the condensate is rinsed to be clean to obtain the modified composite wire;
4) conductive contact formation
Putting the ethylene-vinyl acetate copolymer prepared in the step 1) in a vacuum box, heating to 40-45 ℃, and drying for 2 hours to obtain a matrix material;
secondly, mixing the base material obtained in the first step with the magnetic powder obtained in the fourth step in the stage 2), uniformly stirring, then carrying out internal mixing by adopting a double screw at a rotating speed of 45-50 rpm/min and a temperature of 78-83 ℃ for 12-15 min to obtain mixed homogeneous phase colloid, forcibly compressing the mixed homogeneous phase colloid to the size of the magnetic core required by design, and then cooling and solidifying to obtain the prefabricated magnetic core;
thirdly, heating the pure copper powder prepared in the step 1) to be molten, uniformly spraying the molten pure copper powder on the surface of the prefabricated magnetic core obtained in the step two, and then mechanically polishing the surface of the prefabricated magnetic core to obtain two end surfaces of the composite material to obtain the magnetic core to be finished
And fourthly, sleeving the finished magnetic core obtained in the third step as a movable structure in the fixed sleeve prepared in the first step in the step 1), cutting off the head and the tail of the modified composite wire obtained in the step 3), and winding the modified composite wire on the inner surface of the fixed sleeve to ensure that the modified composite wire is not in contact with the surface of the finished magnetic core, so that a composite core structure is obtained, and the composite core structure is the required low-cost forced assembly permanent magnet conductive contact.
The magnetic core manufactured according to the embodiment has the following magnetic properties: br 0.37T, Hci 965kA/m and (BH) max 37.2kJ/m3. (the same below)
Example 2:
the whole is in accordance with example 1, with the difference that:
raw materials: 500g of ethylene-vinyl acetate copolymer, 8g of pure copper powder, 6g of metal lanthanum, 3.5g of cerium, 0.05100g of ferroboron FeB22C0.05100g, 5g of yttrium and 0.2g of ammonium persulfate initiator;
example 3:
the whole is in accordance with example 1, with the difference that:
raw materials: 600g of ethylene-vinyl acetate copolymer, 6g of pure copper powder, 8g of metal lanthanum, 4.5g of cerium, ferroboron FeB22C0.05110g, 7g of yttrium and 0.5g of ammonium persulfate initiator;
the previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. A manufacturing method of a low-cost forced assembly permanent magnet conductive contact is characterized by comprising the following steps:
1) raw material preparation
Preparing raw materials: preparing 500-600 parts of ethylene-vinyl acetate copolymer, 6-8 parts of metal lanthanum, 3.5-4.5 parts of cerium, 6-8 parts of ferroboron FeB22C0.05100-110 parts of yttrium, 5-7 parts of fixed sleeve, enough carbon fiber and aluminum core composite lead, 6-8 parts of pure copper powder, enough aniline and 0.2-0.5 part of ammonium persulfate initiator according to parts by weight;
preparing auxiliary materials: preparing enough components according to the volume ratio of 3: 1, mixing a mixed solution of concentrated sulfuric acid and concentrated nitric acid, enough 10% of hydrochloric acid aqueous solution with solute mass fraction, and enough argon;
2) preparation of magnetic powder
Firstly, under the protection of sufficient argon prepared in the step two of the stage 1), uniformly mixing lanthanum, cerium, ferroboron FeB22C0.05 and yttrium prepared in the step 1), then carrying out electroslag remelting smelting, and then cooling to room temperature along with a furnace to prepare a primary alloy blank;
and secondly, ball-milling the primary alloy blank obtained in the step I into alloy powder of 500-1000 meshes, smelting the alloy powder serving as a raw material by using a cylindrical silicon dioxide container as a mould and adopting a vacuum induction smelting furnace integrated with electromagnetic stirring equipment, wherein the smelting process comprises the following steps of: vacuumizing to 1X 10 before heating-2Pa-1×10-3Pa, timing when the raw materials begin to melt after the temperature is reached, starting electromagnetic stirring at the stirring speed of 100-250 rpm/min, keeping the temperature for 20-23 min, stopping heating, rapidly cooling by adopting nitrogen, discharging from the furnace, and demolding to obtain a rough magnetic core;
thirdly, the rough magnetic core obtained in the second step is 1 multiplied by 10-2Pa-1×10-3Annealing at 730-750 ℃ under Pa vacuum degree, and mechanically polishing the cylindrical surface and two end faces of the rough magnetic core obtained after annealing to remove the thickness of 0.3-0.5 mm to obtain a regular magnetic core;
fourthly, grinding the regular magnetic core obtained in the third step into powder of 1000-1500 meshes to obtain the required magnetic powder;
3) wire preparation
Completely immersing the carbon fiber aluminum core composite wire prepared in the step 1) in the mixed solution of concentrated sulfuric acid and concentrated nitric acid prepared in the step two in the step 1) for 3.5-4 h by adopting 200-250W ultrasonic treatment to obtain a carboxylated passivated composite wire, and then rinsing the composite wire by adopting clear water;
immersing the carboxylated passivated composite wire obtained in the step I into the hydrochloric acid aqueous solution prepared in the step II in the stage 1), immersing the hydrochloric acid aqueous solution into an ice bath at the temperature of minus 5 ℃ to minus 10 ℃, starting stirring at the speed of 120rpm/min to 150rpm/min, then putting aniline prepared in the step I in the stage 1), finally putting the ammonium persulfate initiator prepared in the step I in the stage 1) into the reaction solution at the mass speed of 10 percent/min, stirring for 40min to 50min, taking out the reaction solution, standing for 0.5 to 1 day in a refrigerator at the temperature of minus 5 ℃ to minus 10 ℃, filtering out a condensate, and respectively rinsing with ethanol and water until the condensate is rinsed to be clean to obtain the modified composite wire;
4) conductive contact formation
Putting the ethylene-vinyl acetate copolymer prepared in the step 1) in a vacuum box, heating to 40-45 ℃, and drying for 2 hours to obtain a matrix material;
secondly, mixing the base material obtained in the first step with the magnetic powder obtained in the fourth step in the stage 2), uniformly stirring, then carrying out internal mixing by adopting a double screw at a rotating speed of 45-50 rpm/min and a temperature of 78-83 ℃ for 12-15 min to obtain mixed homogeneous phase colloid, forcibly compressing the mixed homogeneous phase colloid to the size of the magnetic core required by design, and then cooling and solidifying to obtain the prefabricated magnetic core;
thirdly, heating the pure copper powder prepared in the step 1) to be molten, uniformly spraying the molten pure copper powder on the surface of the prefabricated magnetic core obtained in the step two, and then mechanically polishing the surface of the prefabricated magnetic core to obtain two end surfaces of the composite material to obtain the magnetic core to be finished
And fourthly, sleeving the finished magnetic core obtained in the third step as a movable structure in the fixed sleeve prepared in the first step in the step 1), cutting off the head and the tail of the modified composite wire obtained in the step 3), and winding the modified composite wire on the inner surface of the fixed sleeve to ensure that the modified composite wire is not in contact with the surface of the finished magnetic core, so that a composite core structure is obtained, and the composite core structure is the required low-cost forced assembly permanent magnet conductive contact.
2. The utility model provides a low-cost compulsory equipment permanent magnetism conductive contact which characterized in that: the permanent magnetic conductive contact consists of three parts: the coil comprises a fixed sleeve, a core body and a coil, wherein the core body is a composite core body which is prepared by taking 6-8 parts by weight of lanthanum, 3.5-4.5 parts by weight of cerium, 0.05100-110 parts by weight of ferroboron FeB22C0.05100 and 5-7 parts by weight of yttrium as raw materials, mixing and smelting the raw materials to obtain an alloy as a magnetic material, taking ethylene-vinyl acetate copolymer as a base material, integrating and curing the base material and taking pure copper as a shell, and the composite core body is sleeved in the fixed sleeve; the coil is formed by winding aniline modified carbon fiber aluminum core composite wires wound on the surface of the core body, and the coil is wound on the inner surface of the fixed sleeve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021143475A1 (en) * | 2020-01-16 | 2021-07-22 | 山东光韵智能科技有限公司 | Low-cost soft and hard dual-phase nano composite permanent magnet conductive contact and fabrication method therefor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021143475A1 (en) * | 2020-01-16 | 2021-07-22 | 山东光韵智能科技有限公司 | Low-cost soft and hard dual-phase nano composite permanent magnet conductive contact and fabrication method therefor |
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Application publication date: 20201124 |