WO2021139531A1 - Self-toughening nano composite permanent magnet conductive contact and manufacturing method therefor - Google Patents

Self-toughening nano composite permanent magnet conductive contact and manufacturing method therefor Download PDF

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WO2021139531A1
WO2021139531A1 PCT/CN2020/138495 CN2020138495W WO2021139531A1 WO 2021139531 A1 WO2021139531 A1 WO 2021139531A1 CN 2020138495 W CN2020138495 W CN 2020138495W WO 2021139531 A1 WO2021139531 A1 WO 2021139531A1
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parts
core
composite
prepared
conductive contact
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PCT/CN2020/138495
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French (fr)
Chinese (zh)
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张敬敏
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山东光韵智能科技有限公司
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Publication of WO2021139531A1 publication Critical patent/WO2021139531A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/048—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by powder-metallurgical processes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details

Definitions

  • the invention relates to the technical field of electrical devices, in particular to a self-toughening nano composite permanent magnetic conductive contact and a manufacturing method thereof.
  • Nanocomposite permanent magnetic materials are composed of nano-scale soft magnetic phases and hard magnetic phases, and theoretically have a high maximum magnetic energy product, and at the same time, the material has a low rare earth content. It is expected to develop into a new generation of low-cost high-performance permanent magnetic materials.
  • the invention aims to provide a method for manufacturing a self-toughening nano composite permanent magnetic conductive contact with high temperature resistance, corrosion resistance and fatigue resistance.
  • a manufacturing method of a self-toughening nano-composite permanent magnetic conductive contact including the following steps:
  • auxiliary materials prepare a sufficient amount of a mixture of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, a sufficient amount of 10% solute mass fraction of hydrochloric acid aqueous solution, and a sufficient amount of argon;
  • step 2 the neodymium, molybdenum, ferro-boron FeB22C0.05 and yttrium prepared in stage 1) are mixed and smelted by electroslag remelting, and then cooled to Make a primary alloy billet at room temperature;
  • the primary alloy billet obtained in step 1 is ball-milled into alloy powder of 500 mesh to 1000 mesh.
  • the alloy powder is used as a raw material
  • a cylindrical silica container is used as a mold
  • a vacuum induction melting furnace integrated with electromagnetic stirring equipment is used to smelt and smelt.
  • the process is: before heating up, vacuum to 1 ⁇ 10-2Pa-1 ⁇ 10-3Pa, when the raw material starts to melt when the temperature is reached, start the electromagnetic stirring at the stirring rate of 100rpm/min-250rpm/min, and keep it warm for 20min-23min. Stop heating and use nitrogen for rapid cooling, then release the mold from the furnace to obtain a rough magnetic core;
  • the rough magnetic core obtained in step 2 is annealed at a temperature of 730°C-750°C under a vacuum degree of 1 ⁇ 10-2Pa-1 ⁇ 10-3Pa, and then the cylindrical surface of the rough magnetic core obtained after annealing and two The end faces are mechanically polished to remove the thickness of 0.3mm-0.5mm to obtain a regular magnetic core;
  • step 1 Completely immerse the carbon fiber aluminum core composite wire prepared in step 1) in step 1 into the mixed solution of concentrated sulfuric acid and concentrated nitric acid prepared in step 2, and use 200W-250W ultrasonic treatment for 3.5h-4h to obtain carboxylated passivated composite wire , And then rinse the composite wire with clean water;
  • step 2 Immerse the carboxylated and passivated composite wire obtained in step 1 into the hydrochloric acid aqueous solution prepared in step 2, immerse the hydrochloric acid aqueous solution in an ice bath at -5°C ⁇ -10°C, and turn it on at a rate of 120rpm/min-150rpm/min Stir, then put in the aniline prepared in step 1), and finally put the ammonium persulfate initiator prepared in step 1 into the reaction solution at a mass rate of 10%/min.
  • Stir for 40min-50min take out the reaction solution and remove it. Place it in a refrigerator at -5°C ⁇ -10°C for 0.5 days to 1 day, filter out the solidified material, and rinse with ethanol and water until it is clean to obtain a modified composite wire;
  • stage 2 Put the final magnetic core obtained in stage 2) as a movable structure in the fixed sleeve prepared in stage 1), and then cut off the head and tail ends of the modified composite wire obtained in stage 3) and wind it in the fixed sleeve
  • the inner surface of the barrel ensures that the modified composite wire does not contact the surface of the final magnetic core, and a composite core structure is obtained.
  • the composite core structure is the required self-toughening nano composite permanent magnetic conductive contact.
  • a self-toughening nano-composite permanent magnetic conductive contact is composed of three parts: a fixed sleeve, a core and a coil.
  • the core is 6-8 parts by weight of neodymium, molybdenum A composite core obtained by mixing 3.5 parts -4.5 parts, boron-iron FeB22C0.05 100 parts -110 parts, and 5-7 parts yttrium as raw materials as the core and pure copper as the shell.
  • the composite core is set in the fixed sleeve In the barrel; the coil is wound by the aniline modified carbon fiber aluminum core composite wire wound on the surface of the core body, and the coil is wound on the inner surface of the fixed sleeve.
  • the invention has the following advantages: (1) The hard magnetic properties of the special magnetic core of the invention are derived from the fine and uniformly distributed soft magnetic phase ⁇ -Fe, Fe3B, and the hard magnetic phase comes from the Nd2Fe14B phase, the soft magnetic phase and the hard magnetic phase There is a strong exchange coupling between the phases.
  • the present invention uses special heat treatment parameters obtained through a lot of basic research and long-term production practice for the special magnetic core. During the research, we found that if the heat treatment temperature is higher than that of the present invention, the magnetic phase crystal will be caused.
  • the present invention actually obtains the contact of the surface layer of pure copper and the integral permanent magnet, which has high magnetic induction and a good conductor.
  • the permanent magnet is used as the core and the pure copper is the shell, which not only obtains excellent magnetic properties, It avoids the stress-sensitive defects of nano-permanent magnetic materials, and at the same time, the surface layer is toughened and impact resistant, and the surface contact area is large.
  • the present invention refers to the finger contact rather than the bridge contact, so there is no metal fatigue problem, only impact damage and wear need to be considered.
  • the present invention is not in the conventional technology, and the surface of the hard core is added
  • the relatively soft permanent magnetic pure copper not only ensures that the magnetic core will not be deformed due to insufficient core strength, but also protects the impacted surface from damage. It also builds a relatively flexible buffer between the two hard bodies. The contact surface is improved, so the invention has strong anti-fatigue ability.
  • All the materials used in the present invention are resistant to high temperature. Because there is no curing material that is not resistant to high temperature such as soldering or resin, the non-flammable carbon fiber and the non-corrosive aluminum core are passivated and protected against aniline adhesion.
  • a self-toughening nano-composite permanent magnetic conductive contact is composed of three parts: a fixed sleeve, a core and a coil.
  • the core is composed of 7g neodymium, 4.2g molybdenum, and boron in parts by weight.
  • a composite core obtained by mixing iron FeB22C0.05 107g and 5.8g yttrium as raw materials and pure copper as a shell.
  • the composite core is set in a fixed sleeve; the coil is changed from aniline wound on the surface of the core.
  • the flexible carbon fiber aluminum core composite wire is wound, and the coil is wound on the inner surface of the fixed sleeve; the manufacturing method of the permanent magnetic conductive contact includes the following steps: 1) Raw material preparation
  • auxiliary materials prepare a sufficient amount of a mixture of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, a sufficient amount of 10% solute mass fraction of hydrochloric acid aqueous solution, and a sufficient amount of argon;
  • step 2 the neodymium, molybdenum, ferro-boron FeB22C0.05 and yttrium prepared in stage 1) are mixed and smelted by electroslag remelting, and then cooled to Make a primary alloy billet at room temperature;
  • the primary alloy billet obtained in step 1 is ball-milled into alloy powder of 500 mesh to 1000 mesh.
  • the alloy powder is used as a raw material
  • a cylindrical silica container is used as a mold
  • a vacuum induction melting furnace integrated with electromagnetic stirring equipment is used to smelt and smelt.
  • the process is: before heating up, vacuum to 1 ⁇ 10-2Pa-1 ⁇ 10-3Pa, when the raw material starts to melt when the temperature is reached, start the electromagnetic stirring at the stirring rate of 100rpm/min-250rpm/min, and keep it warm for 20min-23min. Stop heating and use nitrogen for rapid cooling, then release the mold from the furnace to obtain a rough magnetic core;
  • the rough magnetic core obtained in step 2 is annealed at a temperature of 730°C-750°C under a vacuum degree of 1 ⁇ 10-2Pa-1 ⁇ 10-3Pa, and then the cylindrical surface of the rough magnetic core obtained after annealing and two The end faces are mechanically polished to remove the thickness of 0.3mm-0.5mm to obtain a regular magnetic core;
  • step 1 Completely immerse the carbon fiber aluminum core composite wire prepared in step 1) in step 1 into the mixed solution of concentrated sulfuric acid and concentrated nitric acid prepared in step 2, and use 200W-250W ultrasonic treatment for 3.5h-4h to obtain carboxylated passivated composite wire , And then rinse the composite wire with clean water;
  • step 2 Immerse the carboxylated and passivated composite wire obtained in step 1 into the hydrochloric acid aqueous solution prepared in step 2, immerse the hydrochloric acid aqueous solution in an ice bath at -5°C ⁇ -10°C, and turn it on at a rate of 120rpm/min-150rpm/min Stir, then put in the aniline prepared in step 1), and finally put the ammonium persulfate initiator prepared in step 1 into the reaction solution at a mass rate of 10%/min.
  • Stir for 40min-50min take out the reaction solution and remove it. Place it in a refrigerator at -5°C ⁇ -10°C for 0.5 days to 1 day, filter out the solidified material, and rinse with ethanol and water until it is clean to obtain a modified composite wire;
  • stage 2 Put the final magnetic core obtained in stage 2) as a movable structure in the fixed sleeve prepared in stage 1), and then cut off the head and tail ends of the modified composite wire obtained in stage 3) and wind it in the fixed sleeve
  • the inner surface of the barrel ensures that the modified composite wire does not contact the surface of the final magnetic core, and a composite core structure is obtained.
  • the composite core structure is the required self-toughening nano composite permanent magnetic conductive contact.
  • Raw materials pure copper powder 8g, metal neodymium 6g, molybdenum 3.5g, boron iron FeB22C0.05 100g, yttrium 5g, ammonium persulfate initiator 0.2g;
  • Raw materials pure copper powder 6g, metal neodymium 8g, molybdenum 4.5g, boron iron FeB22C0.05 110g, yttrium 7g, ammonium persulfate initiator 0.5g;
  • the present invention adopts special heat treatment parameters obtained through a lot of basic research and long-term production practice for the special magnetic core.
  • the heat treatment temperature is higher than that of the present invention, the magnetic phase will be caused.
  • the crystal grains grow sharply, and the too coarse crystal grains will weaken the ferromagnetic exchange coupling effect between the magnetic phases, and the lower heat treatment temperature compared with the present invention cannot obtain sufficient magnetic functional phases.
  • the present invention actually obtains the contact of pure copper on the surface and integral permanent magnet, which has both high magnetic induction and good conductor.
  • the permanent magnet is used as the core and the pure copper is the shell, which not only obtains excellent magnetic properties, It avoids the stress-sensitive defects of nano-permanent magnetic materials, and at the same time, the surface layer is toughened and impact resistant, and the surface contact area is large.
  • the present invention refers to the finger contact instead of the bridge contact, so there is no metal fatigue problem, only impact damage and wear need to be considered.
  • the present invention is not in the conventional technology, and the surface of the hard core is added
  • the relatively soft permanent magnetic pure copper not only ensures that the magnetic core will not be deformed due to insufficient core strength, but also protects the impacted surface from damage. It also builds a relatively flexible buffer between the two hard bodies. The contact surface is improved, so the invention has strong anti-fatigue ability.
  • All the materials used in the present invention are resistant to high temperature. Since there is no curing material that is not resistant to high temperature such as soldering or resin, the non-flammable carbon fiber and the non-corrosive aluminum core are passivated and protected against aniline adhesion. The insulation treatment between the core and the core, and at the same time, due to the aniline, it also obtains the self-hydrophobic performance of the coil, which expands the scope of application and reduces the difficulty of surface protection. Therefore, the present invention has the characteristics of high temperature resistance, corrosion resistance and fatigue resistance.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Hard Magnetic Materials (AREA)
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Abstract

A self-toughening nano composite permanent magnet conductive contact and a manufacturing method therefor. The permanent magnet conductive contact consists of three parts: a fixed sleeve, a core body, and a coil, wherein the core body is a composite core body obtained by using alloy formed by mixing the following raw materials in parts by weight: 6-8 parts of neodymium, 3.5-4.5 parts of molybdenum, 100-110 parts of ferroboron FeB22C0.05, and 5-7 parts of yttrium as a core and using pure copper as a shell, and the composite core body is sleeved in the fixed sleeve; the coil is formed by winding an aniline modified carbon fiber aluminum core composite wire wound on the surface of the core body, and the coil is wound on the inner surface of the fixed sleeve. The scheme is resistant to high temperature, corrosion and fatigue.

Description

一种自韧化纳米复合永磁导电触头及其制造方法Self-toughening nano composite permanent magnetic conductive contact and manufacturing method thereof 技术领域Technical field
本发明涉及电气装置技术领域，尤其涉及一种自韧化纳米复合永磁导电触头及其制造方法。The invention relates to the technical field of electrical devices, in particular to a self-toughening nano composite permanent magnetic conductive contact and a manufacturing method thereof.
背景技术Background technique
纳米复合永磁材料由纳米尺度的软磁相和硬磁相组成，理论上具有高的最大磁能积，同时材料稀土含量低，有望发展为新一代低成本高性能永磁材料。Nanocomposite permanent magnetic materials are composed of nano-scale soft magnetic phases and hard magnetic phases, and theoretically have a high maximum magnetic energy product, and at the same time, the material has a low rare earth content. It is expected to develop into a new generation of low-cost high-performance permanent magnetic materials.
技术问题technical problem
但市面上的触头最主要的失效原因有三：1、发热，2、锈蚀，3、疲劳裂纹，只有找到了影响高压隔离开关触头失效的原因，同时从影响触头导电性的角度出发，找到影响触头失效的因素，如温度、应力以及环境因素等，才能解决现有触头的问题。However, there are three main reasons for the failure of the contacts on the market: 1, heat, 2, rust, and 3, fatigue cracks. Only when the cause of the failure of the high-voltage isolating switch contact is found, and from the perspective of affecting the conductivity of the contact, Only by finding the factors that affect contact failure, such as temperature, stress, and environmental factors, can the existing contact problems be solved.
　　因此，市面上急需一种耐高温、耐腐蚀、抗疲劳的自韧化纳米复合永磁导电触头及其制造方法。　　 Therefore, there is an urgent need in the market for a self-toughening nano-composite permanent magnetic conductive contact with high temperature resistance, corrosion resistance and fatigue resistance and a manufacturing method thereof.
技术解决方案Technical solutions
本发明旨在提供一种耐高温、耐腐蚀、抗疲劳的自韧化纳米复合永磁导电触头制造方法。The invention aims to provide a method for manufacturing a self-toughening nano composite permanent magnetic conductive contact with high temperature resistance, corrosion resistance and fatigue resistance.
为了实现上述目的，本发明采用以下技术方案：一种自韧化纳米复合永磁导电触头的制造方法，包括以下步骤：In order to achieve the above objective, the present invention adopts the following technical solution: a manufacturing method of a self-toughening nano-composite permanent magnetic conductive contact, including the following steps:
1）原料准备1) Raw material preparation
①原材料准备：按重量份准备纯铜粉6份-8份、金属钕6份-8份、钼3.5份-4.5份、硼铁FeB22C0.05 100份-110份、钇5份-7份、固定套筒、足量碳纤维铝芯复合导线、足量苯胺、过硫酸铵引发剂0.2份-0.5份；①Preparation of raw materials: prepare 6-8 parts of pure copper powder, 6-8 parts of neodymium metal, 3.5-4.5 parts of molybdenum, 100-110 parts of boron iron FeB22C0.05, 5-7 parts of yttrium according to weight parts, Fixed sleeve, sufficient carbon fiber aluminum core composite wire, sufficient aniline, 0.2-0.5 parts of ammonium persulfate initiator;
②辅材准备：准备足量按体积比3：1配比的浓硫酸与浓硝酸的混合液，足量10%溶质质量分数的盐酸水溶液，足量氩气；② Preparation of auxiliary materials: prepare a sufficient amount of a mixture of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, a sufficient amount of 10% solute mass fraction of hydrochloric acid aqueous solution, and a sufficient amount of argon;
2）芯体准备2) Core preparation
①在阶段1）步骤②准备的足量氩气保护下，将阶段1）步骤①准备的钕、钼、硼铁FeB22C0.05、钇混合均匀后经电渣重熔冶炼，然后随炉冷却至室温，制成一次合金坯；①Under the protection of sufficient argon gas prepared in stage 1), step ②, the neodymium, molybdenum, ferro-boron FeB22C0.05 and yttrium prepared in stage 1) are mixed and smelted by electroslag remelting, and then cooled to Make a primary alloy billet at room temperature;
②将步骤①获得的一次合金坯球磨成500目-1000目的合金粉末，以该合金粉末为原料，以圆柱形二氧化硅容器为模具，采用集成有电磁搅拌设备的真空感应熔炼炉熔炼，熔炼工艺为：升温前抽真空至1×10-2Pa-1×10-3Pa，待到温后原料开始熔化时计时，开启100rpm/min-250rpm/min搅拌速率的电磁搅拌，并保温20min-23min后停止加热并采用氮气速冷，然后出炉脱模，获得粗糙磁芯；②The primary alloy billet obtained in step ① is ball-milled into alloy powder of 500 mesh to 1000 mesh. The alloy powder is used as a raw material, a cylindrical silica container is used as a mold, and a vacuum induction melting furnace integrated with electromagnetic stirring equipment is used to smelt and smelt. The process is: before heating up, vacuum to 1×10-2Pa-1×10-3Pa, when the raw material starts to melt when the temperature is reached, start the electromagnetic stirring at the stirring rate of 100rpm/min-250rpm/min, and keep it warm for 20min-23min. Stop heating and use nitrogen for rapid cooling, then release the mold from the furnace to obtain a rough magnetic core;
③将步骤②获得的粗糙磁芯在1×10-2Pa-1×10-3Pa真空度下，以730℃-750℃的温度退火处理，再将退火后获得的粗糙磁芯圆柱表面及两个端面均机械抛光去除0.3mm-0.5mm的厚度，获得规则磁芯；③The rough magnetic core obtained in step ② is annealed at a temperature of 730℃-750℃ under a vacuum degree of 1×10-2Pa-1×10-3Pa, and then the cylindrical surface of the rough magnetic core obtained after annealing and two The end faces are mechanically polished to remove the thickness of 0.3mm-0.5mm to obtain a regular magnetic core;
④将阶段1）步骤①准备的纯铜粉加热至熔化后，采用超声速火焰喷涂方式均匀喷涂在步骤③获得的规则磁芯表面，然后机械抛光获得复合材料的两个端面，获得所需终制磁芯；④ After heating the pure copper powder prepared in step 1) to melt, use supersonic flame spraying method to spray uniformly on the surface of the regular magnetic core obtained in step ③, and then mechanically polish to obtain the two end faces of the composite material to obtain the desired final product Magnetic core
3）导线制备3) Wire preparation
①将阶段1）步骤①准备的碳纤维铝芯复合导线完全浸入阶段1）步骤②准备的浓硫酸与浓硝酸的混合液，采用200W-250W超声波处理3.5h-4h，获得羧化钝化复合导线，然后采用清水将复合导线漂洗干净；① Completely immerse the carbon fiber aluminum core composite wire prepared in step 1) in step ① into the mixed solution of concentrated sulfuric acid and concentrated nitric acid prepared in step ②, and use 200W-250W ultrasonic treatment for 3.5h-4h to obtain carboxylated passivated composite wire , And then rinse the composite wire with clean water;
②将步骤①获得的羧化钝化复合导线浸入阶段1）步骤②准备的盐酸水溶液中，将盐酸水溶液浸入-5℃~-10℃的冰浴，以120rpm/min-150rpm/min的速率开启搅拌，然后投入阶段1）步骤①准备的苯胺，最后以10%/min的质量速率在反应液中投入阶段1）步骤①准备的过硫酸铵引发剂，搅拌40min-50min，取出反应液将其在-5℃~-10℃冰箱内静置0.5天-1天，滤出固化物，并采用乙醇与水分别漂洗至漂洗干净，获得改性复合导线；② Immerse the carboxylated and passivated composite wire obtained in step ① into the hydrochloric acid aqueous solution prepared in step ②, immerse the hydrochloric acid aqueous solution in an ice bath at -5°C~-10°C, and turn it on at a rate of 120rpm/min-150rpm/min Stir, then put in the aniline prepared in step 1), and finally put the ammonium persulfate initiator prepared in step 1 into the reaction solution at a mass rate of 10%/min. Stir for 40min-50min, take out the reaction solution and remove it. Place it in a refrigerator at -5℃~-10℃ for 0.5 days to 1 day, filter out the solidified material, and rinse with ethanol and water until it is clean to obtain a modified composite wire;
4）导电触头成型4) Conductive contact molding
①将阶段2）获得的终制磁芯作为可移动结构套装在阶段1）步骤①准备的固定套筒中，再将阶段3）获得的改性复合导线剪去首尾端后卷绕在固定套筒内表面，保证改性复合导线与终制磁芯表面不相接触，获得复合芯体结构，该复合芯体结构即为所需自韧化纳米复合永磁导电触头。① Put the final magnetic core obtained in stage 2) as a movable structure in the fixed sleeve prepared in stage 1), and then cut off the head and tail ends of the modified composite wire obtained in stage 3) and wind it in the fixed sleeve The inner surface of the barrel ensures that the modified composite wire does not contact the surface of the final magnetic core, and a composite core structure is obtained. The composite core structure is the required self-toughening nano composite permanent magnetic conductive contact.
　　一种自韧化纳米复合永磁导电触头，该永磁导电触头由三部分组成：固定套筒、芯体和线圈，其中芯体为以按重量份计钕6份-8份、钼3.5份-4.5份、硼铁FeB22C0.05 100份-110份、钇5份-7份为原料混炼成的合金为芯，以纯铜为壳获得的复合芯体，复合芯体套装在固定套筒中；线圈由卷绕在芯体表面的苯胺改性碳纤维铝芯复合导线绕制而成，线圈卷绕在固定套筒的内表面。A self-toughening nano-composite permanent magnetic conductive contact. The permanent magnetic conductive contact is composed of three parts: a fixed sleeve, a core and a coil. The core is 6-8 parts by weight of neodymium, molybdenum A composite core obtained by mixing 3.5 parts -4.5 parts, boron-iron FeB22C0.05 100 parts -110 parts, and 5-7 parts yttrium as raw materials as the core and pure copper as the shell. The composite core is set in the fixed sleeve In the barrel; the coil is wound by the aniline modified carbon fiber aluminum core composite wire wound on the surface of the core body, and the coil is wound on the inner surface of the fixed sleeve.
有益效果Beneficial effect
本发明具有以下优点：（1）本发明特制的磁芯其硬磁性能来源于细小及均匀分布的软磁相α-Fe，Fe3B，而硬磁相来源于Nd2Fe14B相，软磁相与硬磁相间存在强的交换耦合作用。使本发明获得的磁性能为：Br= 0.51 T， Hci=1289 kA/m 以及(BH)max = 46.2 kJ/m3。（2）本发明对特制的磁芯采用了特别的、经过大量基础研究和长期生产实践获得的热处理参数，在研究中我们发现，若采用相对于本发明更高的热处理温度将引起磁性相晶粒急剧长大，过于粗大的晶粒会减弱磁性相间的铁磁交换耦合作用，而相对于本发明更低的热处理温度则无法获得足够的磁性功能相。（3）本发明实际获得了表层纯铜、整体永磁体的触头，既有高的磁感、又是良导体，以永磁体为芯、纯铜为壳，既获得了优良的磁性能，又回避了纳米永磁材料对应力敏感的缺陷，同时表层韧化抗冲击、表面接触面积大。（4）本发明是指形触头而不是桥形触头，因此不存在金属疲劳的问题，仅需考虑冲击损坏和磨损，而本发明不中于常规技术，在硬质芯体表面增加了相对柔软的永磁性的纯铜，既保证了磁芯不会由于芯体强度不够导致变形，又保护了被撞击面不受损坏，还在两个硬质体间建设了相对柔性的缓冲，同时提升了接触面，因此本发明抗疲劳能力强。（5）本发明采用的所有材料均耐高温，由于没有采用锡焊或树脂等不耐高温的固化材料，同时对不耐燃的碳纤维和不耐蚀的铝芯进行了钝化和苯胺附着防护及与芯体间的绝缘处理，同时由于苯胺的原因，还获得了感觉线圈自憎水的性能，扩大了应用范围，降低了表面防护难度。因此，本发明具有耐高温、耐腐蚀、抗疲劳的特性。The invention has the following advantages: (1) The hard magnetic properties of the special magnetic core of the invention are derived from the fine and uniformly distributed soft magnetic phase α-Fe, Fe3B, and the hard magnetic phase comes from the Nd2Fe14B phase, the soft magnetic phase and the hard magnetic phase There is a strong exchange coupling between the phases. The magnetic properties obtained by the present invention are: Br = 0.51 T, Hci = 1289 kA/m and (BH)max = 46.2 kJ/m3. (2) The present invention uses special heat treatment parameters obtained through a lot of basic research and long-term production practice for the special magnetic core. During the research, we found that if the heat treatment temperature is higher than that of the present invention, the magnetic phase crystal will be caused. The grains grow rapidly, and too coarse grains will weaken the ferromagnetic exchange coupling between the magnetic phases, and the lower heat treatment temperature compared to the present invention cannot obtain sufficient magnetic functional phases. (3) The present invention actually obtains the contact of the surface layer of pure copper and the integral permanent magnet, which has high magnetic induction and a good conductor. The permanent magnet is used as the core and the pure copper is the shell, which not only obtains excellent magnetic properties, It avoids the stress-sensitive defects of nano-permanent magnetic materials, and at the same time, the surface layer is toughened and impact resistant, and the surface contact area is large. (4) The present invention refers to the finger contact rather than the bridge contact, so there is no metal fatigue problem, only impact damage and wear need to be considered. However, the present invention is not in the conventional technology, and the surface of the hard core is added The relatively soft permanent magnetic pure copper not only ensures that the magnetic core will not be deformed due to insufficient core strength, but also protects the impacted surface from damage. It also builds a relatively flexible buffer between the two hard bodies. The contact surface is improved, so the invention has strong anti-fatigue ability. (5) All the materials used in the present invention are resistant to high temperature. Because there is no curing material that is not resistant to high temperature such as soldering or resin, the non-flammable carbon fiber and the non-corrosive aluminum core are passivated and protected against aniline adhesion. The insulation treatment between the core and the core, and at the same time, due to the aniline, it also obtains the self-hydrophobic performance of the coil, which expands the scope of application and reduces the difficulty of surface protection. Therefore, the present invention has the characteristics of high temperature resistance, corrosion resistance and fatigue resistance.
本发明的最佳实施方式The best mode of the present invention
实施例1：Example 1:
一种自韧化纳米复合永磁导电触头，该永磁导电触头由三部分组成：固定套筒、芯体和线圈，其中芯体为以按重量份计钕7g、钼4.2g、硼铁FeB22C0.05 107g、钇5.8g为原料混炼成的合金为芯，以纯铜为壳获得的复合芯体，复合芯体套装在固定套筒中；线圈由卷绕在芯体表面的苯胺改性碳纤维铝芯复合导线绕制而成，线圈卷绕在固定套筒的内表面；该永磁导电触头的制造方法包括以下步骤：        1）原料准备A self-toughening nano-composite permanent magnetic conductive contact. The permanent magnetic conductive contact is composed of three parts: a fixed sleeve, a core and a coil. The core is composed of 7g neodymium, 4.2g molybdenum, and boron in parts by weight. A composite core obtained by mixing iron FeB22C0.05 107g and 5.8g yttrium as raw materials and pure copper as a shell. The composite core is set in a fixed sleeve; the coil is changed from aniline wound on the surface of the core. The flexible carbon fiber aluminum core composite wire is wound, and the coil is wound on the inner surface of the fixed sleeve; the manufacturing method of the permanent magnetic conductive contact includes the following steps: 1) Raw material preparation
①原材料准备：按重量份准备纯铜粉7g、金属钕7g、钼4.2g、硼铁FeB22C0.05 107g、钇5.8g、固定套筒、足量碳纤维铝芯复合导线、足量苯胺、过硫酸铵引发剂0.2g-0.5g；①Preparation of raw materials: prepare pure copper powder 7g, metal neodymium 7g, molybdenum 4.2g, boron iron FeB22C0.05 107g, yttrium 5.8g, fixed sleeve, sufficient carbon fiber aluminum core composite wire, sufficient aniline, persulfuric acid in parts by weight Ammonium initiator 0.2g-0.5g;
②辅材准备：准备足量按体积比3：1配比的浓硫酸与浓硝酸的混合液，足量10%溶质质量分数的盐酸水溶液，足量氩气；② Preparation of auxiliary materials: prepare a sufficient amount of a mixture of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, a sufficient amount of 10% solute mass fraction of hydrochloric acid aqueous solution, and a sufficient amount of argon;
2）芯体准备2) Core preparation
①在阶段1）步骤②准备的足量氩气保护下，将阶段1）步骤①准备的钕、钼、硼铁FeB22C0.05、钇混合均匀后经电渣重熔冶炼，然后随炉冷却至室温，制成一次合金坯；①Under the protection of sufficient argon gas prepared in stage 1), step ②, the neodymium, molybdenum, ferro-boron FeB22C0.05 and yttrium prepared in stage 1) are mixed and smelted by electroslag remelting, and then cooled to Make a primary alloy billet at room temperature;
②将步骤①获得的一次合金坯球磨成500目-1000目的合金粉末，以该合金粉末为原料，以圆柱形二氧化硅容器为模具，采用集成有电磁搅拌设备的真空感应熔炼炉熔炼，熔炼工艺为：升温前抽真空至1×10-2Pa-1×10-3Pa，待到温后原料开始熔化时计时，开启100rpm/min-250rpm/min搅拌速率的电磁搅拌，并保温20min-23min后停止加热并采用氮气速冷，然后出炉脱模，获得粗糙磁芯；②The primary alloy billet obtained in step ① is ball-milled into alloy powder of 500 mesh to 1000 mesh. The alloy powder is used as a raw material, a cylindrical silica container is used as a mold, and a vacuum induction melting furnace integrated with electromagnetic stirring equipment is used to smelt and smelt. The process is: before heating up, vacuum to 1×10-2Pa-1×10-3Pa, when the raw material starts to melt when the temperature is reached, start the electromagnetic stirring at the stirring rate of 100rpm/min-250rpm/min, and keep it warm for 20min-23min. Stop heating and use nitrogen for rapid cooling, then release the mold from the furnace to obtain a rough magnetic core;
③将步骤②获得的粗糙磁芯在1×10-2Pa-1×10-3Pa真空度下，以730℃-750℃的温度退火处理，再将退火后获得的粗糙磁芯圆柱表面及两个端面均机械抛光去除0.3mm-0.5mm的厚度，获得规则磁芯；③The rough magnetic core obtained in step ② is annealed at a temperature of 730℃-750℃ under a vacuum degree of 1×10-2Pa-1×10-3Pa, and then the cylindrical surface of the rough magnetic core obtained after annealing and two The end faces are mechanically polished to remove the thickness of 0.3mm-0.5mm to obtain a regular magnetic core;
④将阶段1）步骤①准备的纯铜粉加热至熔化后，采用超声速火焰喷涂方式均匀喷涂在步骤③获得的规则磁芯表面，然后机械抛光获得复合材料的两个端面，获得所需终制磁芯；④ After heating the pure copper powder prepared in step 1) to melt, use supersonic flame spraying method to spray uniformly on the surface of the regular magnetic core obtained in step ③, and then mechanically polish to obtain the two end faces of the composite material to obtain the desired final product Magnetic core
3）导线制备3) Wire preparation
①将阶段1）步骤①准备的碳纤维铝芯复合导线完全浸入阶段1）步骤②准备的浓硫酸与浓硝酸的混合液，采用200W-250W超声波处理3.5h-4h，获得羧化钝化复合导线，然后采用清水将复合导线漂洗干净；① Completely immerse the carbon fiber aluminum core composite wire prepared in step 1) in step ① into the mixed solution of concentrated sulfuric acid and concentrated nitric acid prepared in step ②, and use 200W-250W ultrasonic treatment for 3.5h-4h to obtain carboxylated passivated composite wire , And then rinse the composite wire with clean water;
②将步骤①获得的羧化钝化复合导线浸入阶段1）步骤②准备的盐酸水溶液中，将盐酸水溶液浸入-5℃~-10℃的冰浴，以120rpm/min-150rpm/min的速率开启搅拌，然后投入阶段1）步骤①准备的苯胺，最后以10%/min的质量速率在反应液中投入阶段1）步骤①准备的过硫酸铵引发剂，搅拌40min-50min，取出反应液将其在-5℃~-10℃冰箱内静置0.5天-1天，滤出固化物，并采用乙醇与水分别漂洗至漂洗干净，获得改性复合导线；② Immerse the carboxylated and passivated composite wire obtained in step ① into the hydrochloric acid aqueous solution prepared in step ②, immerse the hydrochloric acid aqueous solution in an ice bath at -5°C~-10°C, and turn it on at a rate of 120rpm/min-150rpm/min Stir, then put in the aniline prepared in step 1), and finally put the ammonium persulfate initiator prepared in step 1 into the reaction solution at a mass rate of 10%/min. Stir for 40min-50min, take out the reaction solution and remove it. Place it in a refrigerator at -5℃~-10℃ for 0.5 days to 1 day, filter out the solidified material, and rinse with ethanol and water until it is clean to obtain a modified composite wire;
4）导电触头成型4) Conductive contact molding
①将阶段2）获得的终制磁芯作为可移动结构套装在阶段1）步骤①准备的固定套筒中，再将阶段3）获得的改性复合导线剪去首尾端后卷绕在固定套筒内表面，保证改性复合导线与终制磁芯表面不相接触，获得复合芯体结构，该复合芯体结构即为所需自韧化纳米复合永磁导电触头。① Put the final magnetic core obtained in stage 2) as a movable structure in the fixed sleeve prepared in stage 1), and then cut off the head and tail ends of the modified composite wire obtained in stage 3) and wind it in the fixed sleeve The inner surface of the barrel ensures that the modified composite wire does not contact the surface of the final magnetic core, and a composite core structure is obtained. The composite core structure is the required self-toughening nano composite permanent magnetic conductive contact.
根据本实施例制造出的磁芯，其磁性能为：Br= 0.51 T， Hci=1289 kA/m 以及(BH)max = 46.2 kJ/m3。（下同）The magnetic performance of the magnetic core manufactured according to this embodiment is: Br = 0.51 T, Hci=1289 kA/m and (BH)max = 46.2 kJ/m3. (The same below)
实施例2：Example 2:
整体与实施例1一致，差异之处在于：The whole is consistent with Example 1, the difference lies in:
原材料：纯铜粉8g、金属钕6g、钼3.5g、硼铁FeB22C0.05 100g、钇5g、过硫酸铵引发剂0.2g；Raw materials: pure copper powder 8g, metal neodymium 6g, molybdenum 3.5g, boron iron FeB22C0.05 100g, yttrium 5g, ammonium persulfate initiator 0.2g;
实施例3：Example 3:
整体与实施例1一致，差异之处在于：The whole is consistent with Example 1, the difference lies in:
原材料：纯铜粉6g、金属钕8g、钼4.5g、硼铁FeB22C0.05 110g、钇7g、过硫酸铵引发剂0.5g；Raw materials: pure copper powder 6g, metal neodymium 8g, molybdenum 4.5g, boron iron FeB22C0.05 110g, yttrium 7g, ammonium persulfate initiator 0.5g;
工业实用性Industrial applicability
）（1）本发明对特制的磁芯采用了特别的、经过大量基础研究和长期生产实践获得的热处理参数，在研究中我们发现，若采用相对于本发明更高的热处理温度将引起磁性相晶粒急剧长大，过于粗大的晶粒会减弱磁性相间的铁磁交换耦合作用，而相对于本发明更低的热处理温度则无法获得足够的磁性功能相。（2）本发明实际获得了表层纯铜、整体永磁体的触头，既有高的磁感、又是良导体，以永磁体为芯、纯铜为壳，既获得了优良的磁性能，又回避了纳米永磁材料对应力敏感的缺陷，同时表层韧化抗冲击、表面接触面积大。（3）本发明是指形触头而不是桥形触头，因此不存在金属疲劳的问题，仅需考虑冲击损坏和磨损，而本发明不中于常规技术，在硬质芯体表面增加了相对柔软的永磁性的纯铜，既保证了磁芯不会由于芯体强度不够导致变形，又保护了被撞击面不受损坏，还在两个硬质体间建设了相对柔性的缓冲，同时提升了接触面，因此本发明抗疲劳能力强。（4）本发明采用的所有材料均耐高温，由于没有采用锡焊或树脂等不耐高温的固化材料，同时对不耐燃的碳纤维和不耐蚀的铝芯进行了钝化和苯胺附着防护及与芯体间的绝缘处理，同时由于苯胺的原因，还获得了感觉线圈自憎水的性能，扩大了应用范围，降低了表面防护难度。因此，本发明具有耐高温、耐腐蚀、抗疲劳的特性。) (1) The present invention adopts special heat treatment parameters obtained through a lot of basic research and long-term production practice for the special magnetic core. In the research, we found that if the heat treatment temperature is higher than that of the present invention, the magnetic phase will be caused. The crystal grains grow sharply, and the too coarse crystal grains will weaken the ferromagnetic exchange coupling effect between the magnetic phases, and the lower heat treatment temperature compared with the present invention cannot obtain sufficient magnetic functional phases. (2) The present invention actually obtains the contact of pure copper on the surface and integral permanent magnet, which has both high magnetic induction and good conductor. The permanent magnet is used as the core and the pure copper is the shell, which not only obtains excellent magnetic properties, It avoids the stress-sensitive defects of nano-permanent magnetic materials, and at the same time, the surface layer is toughened and impact resistant, and the surface contact area is large. (3) The present invention refers to the finger contact instead of the bridge contact, so there is no metal fatigue problem, only impact damage and wear need to be considered. However, the present invention is not in the conventional technology, and the surface of the hard core is added The relatively soft permanent magnetic pure copper not only ensures that the magnetic core will not be deformed due to insufficient core strength, but also protects the impacted surface from damage. It also builds a relatively flexible buffer between the two hard bodies. The contact surface is improved, so the invention has strong anti-fatigue ability. (4) All the materials used in the present invention are resistant to high temperature. Since there is no curing material that is not resistant to high temperature such as soldering or resin, the non-flammable carbon fiber and the non-corrosive aluminum core are passivated and protected against aniline adhesion. The insulation treatment between the core and the core, and at the same time, due to the aniline, it also obtains the self-hydrophobic performance of the coil, which expands the scope of application and reduces the difficulty of surface protection. Therefore, the present invention has the characteristics of high temperature resistance, corrosion resistance and fatigue resistance.
序列表自由内容Sequence Listing Free Content
　　对所公开的实施例的上述说明，仅为了使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。"The above description of the disclosed embodiments is only to enable those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.

Claims (2)

  1. 一种自韧化纳米复合永磁导电触头的制造方法，其特征在于包括以下步骤：A manufacturing method of self-toughening nano-composite permanent magnetic conductive contact is characterized in that it comprises the following steps:
    1）原料准备1) Raw material preparation
    ①原材料准备：按重量份准备纯铜粉6份-8份、金属钕6份-8份、钼3.5份-4.5份、硼铁FeB22C0.05 100份-110份、钇5份-7份、固定套筒、足量碳纤维铝芯复合导线、足量苯胺、过硫酸铵引发剂0.2份-0.5份；①Preparation of raw materials: prepare 6-8 parts of pure copper powder, 6-8 parts of neodymium metal, 3.5-4.5 parts of molybdenum, 100-110 parts of boron iron FeB22C0.05, 5-7 parts of yttrium according to weight parts, Fixed sleeve, sufficient carbon fiber aluminum core composite wire, sufficient aniline, 0.2-0.5 parts of ammonium persulfate initiator;
    ②辅材准备：准备足量按体积比3：1配比的浓硫酸与浓硝酸的混合液，足量10%溶质质量分数的盐酸水溶液，足量氩气；② Preparation of auxiliary materials: prepare a sufficient amount of a mixture of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, a sufficient amount of 10% solute mass fraction of hydrochloric acid aqueous solution, and a sufficient amount of argon;
    2）芯体准备2) Core preparation
    ①在阶段1）步骤②准备的足量氩气保护下，将阶段1）步骤①准备的钕、钼、硼铁FeB22C0.05、钇混合均匀后经电渣重熔冶炼，然后随炉冷却至室温，制成一次合金坯；①Under the protection of sufficient argon gas prepared in stage 1), step ②, the neodymium, molybdenum, ferro-boron FeB22C0.05 and yttrium prepared in stage 1) are mixed and smelted by electroslag remelting, and then cooled to Make a primary alloy billet at room temperature;
    ②将步骤①获得的一次合金坯球磨成500目-1000目的合金粉末，以该合金粉末为原料，以圆柱形二氧化硅容器为模具，采用集成有电磁搅拌设备的真空感应熔炼炉熔炼，熔炼工艺为：升温前抽真空至1×10-2Pa-1×10-3Pa，待到温后原料开始熔化时计时，开启100rpm/min-250rpm/min搅拌速率的电磁搅拌，并保温20min-23min后停止加热并采用氮气速冷，然后出炉脱模，获得粗糙磁芯；②The primary alloy billet obtained in step ① is ball-milled into alloy powder of 500 mesh to 1000 mesh. The alloy powder is used as a raw material, a cylindrical silica container is used as a mold, and a vacuum induction melting furnace integrated with electromagnetic stirring equipment is used to smelt and smelt. The process is: before heating up, vacuum to 1×10-2Pa-1×10-3Pa, when the raw material starts to melt when the temperature reaches the temperature, start the electromagnetic stirring at the stirring rate of 100rpm/min-250rpm/min, and keep it warm for 20min-23min. Stop heating and use nitrogen for rapid cooling, then release the mold from the furnace to obtain a rough magnetic core;
    ③将步骤②获得的粗糙磁芯在1×10-2Pa-1×10-3Pa真空度下，以730℃-750℃的温度退火处理，再将退火后获得的粗糙磁芯圆柱表面及两个端面均机械抛光去除0.3mm-0.5mm的厚度，获得规则磁芯；③The rough magnetic core obtained in step ② is annealed at a temperature of 730℃-750℃ under a vacuum degree of 1×10-2Pa-1×10-3Pa, and then the cylindrical surface of the rough magnetic core obtained after annealing and two The end faces are mechanically polished to remove the thickness of 0.3mm-0.5mm to obtain a regular magnetic core;
    ④将阶段1）步骤①准备的纯铜粉加热至熔化后，采用超声速火焰喷涂方式均匀喷涂在步骤③获得的规则磁芯表面，然后机械抛光获得复合材料的两个端面，获得所需终制磁芯；④ After heating the pure copper powder prepared in step 1) to melt, use supersonic flame spraying method to spray uniformly on the surface of the regular magnetic core obtained in step ③, and then mechanically polish to obtain the two end faces of the composite material to obtain the desired final product Magnetic core
    3）导线制备3) Wire preparation
    ①将阶段1）步骤①准备的碳纤维铝芯复合导线完全浸入阶段1）步骤②准备的浓硫酸与浓硝酸的混合液，采用200W-250W超声波处理3.5h-4h，获得羧化钝化复合导线，然后采用清水将复合导线漂洗干净；① Completely immerse the carbon fiber aluminum core composite wire prepared in step 1) in step ① into the mixed solution of concentrated sulfuric acid and concentrated nitric acid prepared in step ②, and use 200W-250W ultrasonic treatment for 3.5h-4h to obtain carboxylated passivated composite wire , And then rinse the composite wire with clean water;
    ②将步骤①获得的羧化钝化复合导线浸入阶段1）步骤②准备的盐酸水溶液中，将盐酸水溶液浸入-5℃~-10℃的冰浴，以120rpm/min-150rpm/min的速率开启搅拌，然后投入阶段1）步骤①准备的苯胺，最后以10%/min的质量速率在反应液中投入阶段1）步骤①准备的过硫酸铵引发剂，搅拌40min-50min，取出反应液将其在-5℃~-10℃冰箱内静置0.5天-1天，滤出固化物，并采用乙醇与水分别漂洗至漂洗干净，获得改性复合导线；② Immerse the carboxylated and passivated composite wire obtained in step ① into the hydrochloric acid aqueous solution prepared in step ②, immerse the hydrochloric acid aqueous solution in an ice bath at -5°C~-10°C, and turn it on at a rate of 120rpm/min-150rpm/min Stir, then put in the aniline prepared in step 1), and finally put the ammonium persulfate initiator prepared in step 1 into the reaction solution at a mass rate of 10%/min. Stir for 40min-50min, take out the reaction solution and remove it. Place it in a refrigerator at -5℃~-10℃ for 0.5 days to 1 day, filter out the solidified material, and rinse with ethanol and water until it is clean to obtain a modified composite wire;
    4）导电触头成型4) Conductive contact molding
    ①将阶段2）获得的终制磁芯作为可移动结构套装在阶段1）步骤①准备的固定套筒中，再将阶段3）获得的改性复合导线剪去首尾端后卷绕在固定套筒内表面，保证改性复合导线与终制磁芯表面不相接触，获得复合芯体结构，该复合芯体结构即为所需自韧化纳米复合永磁导电触头。① Put the final magnetic core obtained in stage 2) as a movable structure in the fixed sleeve prepared in stage 1), and then cut off the head and tail ends of the modified composite wire obtained in stage 3) and wind it in the fixed sleeve The inner surface of the barrel ensures that the modified composite wire does not contact the surface of the final magnetic core, and a composite core structure is obtained. The composite core structure is the required self-toughening nano composite permanent magnetic conductive contact.
  2. 一种自韧化纳米复合永磁导电触头，其特征在于：该永磁导电触头由三部分组成：固定套筒、芯体和线圈，其中芯体为以按重量份计钕6份-8份、钼3.5份-4.5份、硼铁FeB22C0.05 100份-110份、钇5份-7份为原料混炼成的合金为芯，以纯铜为壳获得的复合芯体，复合芯体套装在固定套筒中；线圈由卷绕在芯体表面的苯胺改性碳纤维铝芯复合导线绕制而成，线圈卷绕在固定套筒的内表面。A self-toughening nano composite permanent magnetic conductive contact, which is characterized in that: the permanent magnetic conductive contact is composed of three parts: a fixed sleeve, a core and a coil, wherein the core is 6 parts by weight of neodymium- 8 parts, molybdenum 3.5 parts -4.5 parts, boron iron FeB22C0.05 A composite core obtained by mixing 100 parts -110 parts and 5-7 parts of yttrium as raw materials as the core and pure copper as the shell. The composite core is set in a fixed sleeve; the coil is wound on the surface of the core. The aniline modified carbon fiber aluminum core composite wire is wound, and the coil is wound on the inner surface of the fixed sleeve.
     To
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CN106252009A (en) * 2016-07-26 2016-12-21 浙江大学 A kind of high-performance richness La/Ce/Y rare-earth permanent magnet based on rare earth hydride interpolation and preparation method thereof
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