CN111987508A - Cold deformation tissue adjustment nano composite permanent magnet conductive contact and manufacturing method thereof - Google Patents
Cold deformation tissue adjustment nano composite permanent magnet conductive contact and manufacturing method thereof Download PDFInfo
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- CN111987508A CN111987508A CN202010034104.XA CN202010034104A CN111987508A CN 111987508 A CN111987508 A CN 111987508A CN 202010034104 A CN202010034104 A CN 202010034104A CN 111987508 A CN111987508 A CN 111987508A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
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- H01R13/03—Contact members characterised by the material, e.g. plating, or coating materials
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- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/16—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing contact members, e.g. by punching and by bending
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Abstract
The invention discloses a cold deformation tissue adjustment nanometer composite 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 an alloy which is finally obtained by mixing 6-8 parts by weight of neodymium, 3.5-4.5 parts by weight of molybdenum, 0.05100-110 parts by weight of ferroboron FeB22C0.05100 and 5-7 parts by weight of yttrium according to the weight parts of raw materials, then carrying out cold pressing deformation adjustment for multiple times and then annealing, and is used as a core, the composite core body is obtained by using 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 high Curie temperature, good thermal stability, corrosion resistance and oxidation resistance.
Description
Technical Field
The invention relates to the technical field of electrical devices, in particular to a cold deformation tissue adjustment nanometer composite permanent magnet conductive contact and a manufacturing method thereof.
Background
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 magnetic material has high saturation magnetization of the soft magnetic phase and high coercivity of the hard magnetic phase, obvious remanence enhancement effect appears, and the theoretical magnetic energy product can reach 1MJ/m3. The experimental results for many years show that the remanence of the biphase nano composite permanent magnetic material is obviously improved, and the coercive force is greatly reduced, so that the material has the advantages of high magnetic field strength, high magneticThe relationship of elimination of the length of the two-phase nano permanent magnetic material leads to poor squareness of a demagnetization curve, and the actual magnetic energy product is far lower than a theoretical value, so that the mechanism of the intercrystalline exchange coupling action of the two-phase nano permanent magnetic material, the sizes and volume fractions of soft/hard magnetic grains, a coercive force mechanism and a tissue regulation method need to be deeply researched.
Therefore, a cold deformation structure adjustment nanometer composite permanent magnet conductive contact with high Curie temperature, good thermal stability, corrosion resistance and oxidation resistance and a manufacturing method thereof are urgently needed in the market.
Disclosure of Invention
The invention aims to provide a method for manufacturing a cold deformation structure adjustment nano composite permanent magnet conductive contact which has high Curie temperature, good thermal stability, corrosion resistance and oxidation resistance.
In order to achieve the purpose, the invention adopts the following technical scheme: a manufacturing method of a cold deformation tissue adjustment nanometer composite permanent magnet conductive contact comprises the following steps:
1) raw material preparation
Preparing raw materials: preparing 6-8 parts of pure copper powder, 6-8 parts of metal neodymium, 3.5-4.5 parts of molybdenum, 0.05100-110 parts of ferroboron FeB22C0.5 part of yttrium, 5-7 parts of fixed sleeve, sufficient carbon fiber and aluminum core composite lead, sufficient 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) core preparation
Uniformly mixing neodymium, molybdenum, ferroboron FeB22C0.05 and yttrium prepared in the step 1) under the protection of sufficient argon prepared in the step 1), remelting by electroslag, and 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 vacuum induction smelting furnace integrated with electromagnetic stirring equipment, wherein the smelting process comprises the following steps: vacuumizing to 1X 10 before heating-2Pa-1×10-3Pa, the raw materials begin to melt after the temperature is reachedTiming, starting electromagnetic stirring at a stirring speed of 100-250 rpm/min, keeping the temperature for 20-23 min, stopping heating, rapidly cooling by adopting nitrogen, and discharging to obtain a primary magnetic blank;
thirdly, applying pressure to the primary magnetic blank obtained in the second step along the direction of the magnetic induction direction of the coil required by design, and performing cold die pressing molding at room temperature at the deformation rate of 0.2-0.25 mm for each deformation until the primary magnetic blank is molded to meet the die pressing size, wherein the die pressing size is the size of the final core body design size, the single side is increased by 0.3-0.5 mm, and a coarse magnetic blank is obtained after die pressing molding;
fourthly, the rough magnetic core obtained in the third 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;
fifthly, 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 regular magnetic core obtained in the step three by adopting an ultrasonic flame spraying mode, and then mechanically polishing to obtain two end surfaces of the composite material to obtain the required finished magnetic core;
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
Sleeving the final magnetic core obtained in the stage 2) serving as a movable structure in the fixed sleeve prepared in the step 1), cutting off the head and the tail of the modified composite wire obtained in the stage 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 final magnetic core, so as to obtain a composite core structure, wherein the composite core structure is the nano composite permanent magnetic conductive contact for regulating the cold deformation structure.
A cold deformation tissue adjustment nanometer composite permanent magnetic conductive contact is composed of three parts: the coil comprises a fixed sleeve, a core body and a coil, wherein the core body is an alloy which is finally obtained by mixing 6-8 parts by weight of neodymium, 3.5-4.5 parts by weight of molybdenum, 0.05100-110 parts by weight of ferroboron FeB22C0.05100 and 5-7 parts by weight of yttrium according to the weight parts of raw materials, carrying out cold pressing deformation adjustment for multiple times at the deformation rate of 0.2-0.25 mm per deformation and then carrying out annealing, and the composite core body is obtained by taking pure copper as a shell and 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. In fact, the present invention obtains the coercive force Hcj of the magnet of 7.2kOe by such a texture adjustment; the maximum magnetic energy product (BH) max is 17.8MGOe (the coercive force is improved by about 12-15%, and the maximum magnetic energy product is improved by 30-50%). (2) The hard magnetic performance of the special magnetic core is from fine and evenly distributed soft magnetic phase alpha-Fe, Fe3B, the hard magnetic phase is from Nd2Fe14B phase, and strong exchange coupling effect exists between the soft magnetic phase and the hard magnetic phase. (3) 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. (4) 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. (5) 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. (6) 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 high Curie temperature, good thermal stability, corrosion resistance and oxidation resistance.
Detailed Description
Example 1:
a cold deformation tissue adjustment nanometer composite permanent magnetic conductive contact is composed of three parts: the coil comprises a fixed sleeve, a core body and a coil, wherein the core body is an alloy which is finally obtained by mixing 7g of neodymium, 4.2g of molybdenum, 4.2g of ferroboron FeB22C0.05107g and 5.8g of yttrium in parts by weight and then carrying out cold pressing deformation adjustment and annealing at a deformation rate of 0.2mm-0.25mm per deformation, and the composite core body is obtained by taking pure copper as a shell and 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 7g of pure copper powder, 7g of metal neodymium, 4.2g of molybdenum, 5.8g of ferroboron FeB22C0.05107g 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) core preparation
Uniformly mixing neodymium, molybdenum, ferroboron FeB22C0.05 and yttrium prepared in the step 1) under the protection of sufficient argon prepared in the step 1), remelting by electroslag, and 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 vacuum induction smelting furnace integrated with electromagnetic stirring equipment, wherein the smelting process comprises the following steps: 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, and discharging to obtain a primary magnetic blank;
thirdly, applying pressure to the primary magnetic blank obtained in the second step along the direction of the magnetic induction direction of the coil required by design, and performing cold die pressing molding at room temperature at the deformation rate of 0.2-0.25 mm for each deformation until the primary magnetic blank is molded to meet the die pressing size, wherein the die pressing size is the size of the final core body design size, the single side is increased by 0.3-0.5 mm, and a coarse magnetic blank is obtained after die pressing molding;
fourthly, the rough magnetic core obtained in the third step is 1 multiplied by 10-2Pa-1×10-3Annealing treatment at 730-750 ℃ under Pa vacuum degree,mechanically polishing the cylindrical surface and two end surfaces of the rough magnetic core obtained after annealing to remove the thickness of 0.3mm-0.5mm, and obtaining a regular magnetic core;
fifthly, 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 regular magnetic core obtained in the step three by adopting an ultrasonic flame spraying mode, and then mechanically polishing to obtain two end surfaces of the composite material to obtain the required finished magnetic core;
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
Sleeving the final magnetic core obtained in the stage 2) serving as a movable structure in the fixed sleeve prepared in the step 1), cutting off the head and the tail of the modified composite wire obtained in the stage 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 final magnetic core, so as to obtain a composite core structure, wherein the composite core structure is the nano composite permanent magnetic conductive contact for regulating the cold deformation structure.
The magnetic core manufactured according to the embodiment has the following magnetic properties: coercivity Hcj ═ 7.2 kOe; the maximum magnetic energy product (BH) max is 17.8MGOe (the coercive force is improved by about 12-15%, and the maximum magnetic energy product is improved by 30-50%). (the same below)
Example 2:
the whole is in accordance with example 1, with the difference that:
raw materials: 8g of pure copper powder, 6g of metallic neodymium, 3.5g of molybdenum, 0.05100g of ferroboron FeB22C0.051, 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: 6g of pure copper powder, 8g of metal neodymium, 4.5g of molybdenum, 0.05110g of ferroboron FeB22C0.05110 g 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 method for manufacturing a cold deformation tissue adjustment nanometer composite permanent magnet conductive contact is characterized by comprising the following steps:
1) raw material preparation
Preparing raw materials: preparing 6-8 parts of pure copper powder, 6-8 parts of metal neodymium, 3.5-4.5 parts of molybdenum, 0.05100-110 parts of ferroboron FeB22C0.5 part of yttrium, 5-7 parts of fixed sleeve, sufficient carbon fiber and aluminum core composite lead, sufficient 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) core preparation
Uniformly mixing neodymium, molybdenum, ferroboron FeB22C0.05 and yttrium prepared in the step 1) under the protection of sufficient argon prepared in the step 1), remelting by electroslag, and 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 vacuum induction smelting furnace integrated with electromagnetic stirring equipment, wherein the smelting process comprises the following steps: 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, and discharging to obtain a primary magnetic blank;
thirdly, applying pressure to the primary magnetic blank obtained in the second step along the direction of the magnetic induction direction of the coil required by design, and performing cold die pressing molding at room temperature at the deformation rate of 0.2-0.25 mm for each deformation until the primary magnetic blank is molded to meet the die pressing size, wherein the die pressing size is the size of the final core body design size, the single side is increased by 0.3-0.5 mm, and a coarse magnetic blank is obtained after die pressing molding;
fourthly, the rough magnetic core obtained in the third 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;
fifthly, 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 regular magnetic core obtained in the step three by adopting an ultrasonic flame spraying mode, and then mechanically polishing to obtain two end surfaces of the composite material to obtain the required finished magnetic core;
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
Sleeving the final magnetic core obtained in the stage 2) serving as a movable structure in the fixed sleeve prepared in the step 1), cutting off the head and the tail of the modified composite wire obtained in the stage 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 final magnetic core, so as to obtain a composite core structure, wherein the composite core structure is the nano composite permanent magnetic conductive contact for regulating the cold deformation structure.
2. A cold deformation tissue adjustment nanometer composite permanent magnet conductive contact is 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 an alloy which is finally obtained by mixing 6-8 parts by weight of neodymium, 3.5-4.5 parts by weight of molybdenum, 0.05100-110 parts by weight of ferroboron FeB22C0.05100 and 5-7 parts by weight of yttrium according to the weight parts of raw materials, cold-pressing deformation adjustment and annealing at the deformation rate of 0.2-0.25 mm for each deformation, and is used as a core, and a composite core body is obtained by using pure copper as a shell and 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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| CN202010034104.XA CN111987508A (en) | 2020-01-14 | 2020-01-14 | Cold deformation tissue adjustment nano composite permanent magnet conductive contact and manufacturing method thereof |
| PCT/CN2020/138799 WO2021143476A1 (en) | 2020-01-14 | 2020-12-24 | Cold deformed and adjusted nanocomposite permanent magnet conductive contact and manufacturing method therefor |
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| CN202010034104.XA CN111987508A (en) | 2020-01-14 | 2020-01-14 | Cold deformation tissue adjustment nano composite permanent magnet conductive contact and manufacturing method thereof |
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Cited By (1)
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| WO2021143476A1 (en) * | 2020-01-14 | 2021-07-22 | 山东光韵智能科技有限公司 | Cold deformed and adjusted nanocomposite permanent magnet conductive contact and manufacturing method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE10020695A1 (en) * | 2000-04-27 | 2001-10-31 | Moeller Gmbh | Magnetic release to open a contact system |
| CN106252009B (en) * | 2016-07-26 | 2019-06-25 | 浙江大学 | A kind of high-performance richness La/Ce/Y rare-earth permanent magnet and preparation method thereof based on rare earth hydride addition |
| CN106847457A (en) * | 2017-01-09 | 2017-06-13 | 浙江大学 | A kind of rare-earth permanent magnet and the method for preparing rare-earth permanent magnet |
| CN107617737B (en) * | 2017-11-10 | 2019-11-26 | 湖南稀土金属材料研究院 | Sintered Nd-Fe-B permanent magnetic material powder and its preparation method and application |
| CN108155055A (en) * | 2018-01-18 | 2018-06-12 | 刁俊起 | A kind of electricity permanent-magnet breaker |
| CN111987508A (en) * | 2020-01-14 | 2020-11-24 | 山东光韵智能科技有限公司 | Cold deformation tissue adjustment nano composite permanent magnet conductive contact and manufacturing method thereof |
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| WO2021143476A1 (en) * | 2020-01-14 | 2021-07-22 | 山东光韵智能科技有限公司 | Cold deformed and adjusted nanocomposite permanent magnet conductive contact and manufacturing method therefor |
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