WO2023011464A1 - 一种钕铁硼磁体切割后的处理方法 - Google Patents

一种钕铁硼磁体切割后的处理方法 Download PDF

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WO2023011464A1
WO2023011464A1 PCT/CN2022/109686 CN2022109686W WO2023011464A1 WO 2023011464 A1 WO2023011464 A1 WO 2023011464A1 CN 2022109686 W CN2022109686 W CN 2022109686W WO 2023011464 A1 WO2023011464 A1 WO 2023011464A1
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resin
ndfeb magnets
magnets
ndfeb
epoxy resin
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PCT/CN2022/109686
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English (en)
French (fr)
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刘竞成
张震
徐娟
陈翔
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安徽省瀚海新材料股份有限公司
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F2027/348—Preventing eddy currents

Definitions

  • the invention relates to the technical field of magnet processing, in particular to a treatment method for NdFeB magnets after cutting.
  • NdFeB magnet materials Since the advent of NdFeB magnet materials, it has attracted people's attention for its excellent physical properties. NdFeB magnet materials are widely used in various fields due to their excellent properties such as high coercive force, high electrical conductivity, and high magnetic product energy, including generators, communication equipment, medical equipment, and aerospace. In order to improve the performance of NdFeB magnets, most of the prior art studies how to improve the coercive force of NdFeB magnets, etc., but ignores the problems existing in the application of NdFeB magnet materials.
  • NdFeB magnets There are eddy currents in NdFeB magnets. If they are used in motors, the volume of NdFeB magnets will increase with the increase of motor power, which will cause a rise in temperature. In the worst case, it may cause NdFeB magnets to The magnet material demagnetizes, thereby greatly reducing the performance of the motor.
  • the present invention proposes a treatment method for NdFeB magnets after cutting.
  • a treatment method for NdFeB magnets after cutting.
  • NdFeB magnets after cutting.
  • the NdFeB magnets are cut into N pieces of NdFeB magnets.
  • N is a natural number greater than or equal to 2.
  • the insulating layer slurry is treated in a pulsed magnetic field, it is sprayed until the NdFeB magnets are cut into On the surface of N-1 pieces of NdFeB magnets, and then sintered and solidified at 500-800 ° C for 1.5-3 hours, and then sprayed the adhesive layer slurry on the insulating layer, placed it on the clip tool and clamped it, 300- Curing at 400°C for 1-3h, then cooling to room temperature naturally;
  • the raw materials of the insulating layer slurry are resin, cobalt powder and solid particles;
  • the raw materials of the adhesive layer slurry are oligomer and epoxy resin.
  • the mass ratio of the resin to the cobalt powder is (60-80):(1.5-3), and the amount of the solid particles is 2-4% of the total amount of the resin and the cobalt powder.
  • the mass ratio of the epoxy resin to the oligomer is 1:(5-8).
  • the resin is bisphenol A epoxy resin or novolac epoxy resin
  • the oligomer is petroleum resin
  • the epoxy resin is bisphenol A epoxy resin
  • the petroleum resin is C5 petroleum resin or C9 petroleum resin.
  • the pulsed magnetic field has a voltage of 200-400V and a frequency of 10-20Hz.
  • the solid particles are glass beads or quartz sand.
  • the inventor of the present application proposed a treatment method for NdFeB magnets after cutting, by spraying insulating layer coating on the NdFeB magnets, the purpose of insulation between each NdFeB magnets is realized, and each NdFeB magnet is realized by an adhesive.
  • the inventors of the present application have discovered that eddy currents exist in NdFeB magnets during use, and solve this problem by dividing NdFeB magnets into blocks. After the NdFeB magnet is divided into blocks, it is equivalent to the increase of its equivalent resistance. After the NdFeB magnet is divided into N segments, there will be N more equivalent resistances, thereby reducing the eddy current of the magnet. However, after division, it is necessary to ensure that the NdFeB magnets are absolutely insulated, and at the same time firmly bonded together without reducing the performance of the magnets.
  • cobalt powder is added to the insulating layer slurry, which is an unused technical solution in the technical field of reducing the eddy current of NdFeB magnets.
  • the crystal grains in the insulating layer slurry can be better refined, and the cobalt powder dissolved in the insulating layer slurry will be more evenly distributed. This method can avoid adding polymer dispersants, Reduce the emission of organic pollutants.
  • the adhesive is a mixture of oligomer and epoxy resin, and mixing the two substances can achieve a better bonding effect.
  • Oligomer is a kind of viscous liquid or semi-solid, which can undergo curing reaction, and through the reaction of its functional groups, the state of matter can change from liquid to solid.
  • solvents such as alcohols and acetones for dissolution, which reduces the discharge of organic pollutants and is conducive to protecting the environment.
  • the present invention has the following beneficial effects:
  • NdFeB magnets are cut into N pieces of NdFeB magnets.
  • N is a natural number greater than or equal to 2.
  • the insulating layer slurry is treated in a pulsed magnetic field, it is sprayed until it is cut into pieces.
  • the raw materials of the insulating layer slurry are resin, cobalt powder and solid particles;
  • the raw materials of the adhesive layer slurry are oligomer and epoxy resin.
  • NdFeB magnet a piece of NdFeB magnet is selected, and the selected NdFeB magnet is provided by Dongyang Magnet Factory, and the used brand is N35. Cut the NdFeB magnet into N pieces, N ⁇ 2. After cutting, the NdFeB magnets are pre-treated, including cleaning, ultrasonic and other routine operations, and then spraying and other operations.
  • the mass ratio of the resin to the cobalt powder is (60-80):(1.5-3), and the amount of the solid particles is 2-4% of the total amount of the resin and the cobalt powder.
  • the mass ratio of resin to cobalt powder is 60:1.5, 65:2 or 70:2.5, and the amount of solid particles is 2.5% or 3% of the total amount of resin and cobalt powder.
  • the mass ratio of described epoxy resin and oligomer is 1: (5-8), in the embodiment of the present invention, the mass ratio of epoxy resin used and oligomer is 1:5, 1: 6 or 1:7.5.
  • the resin is bisphenol A epoxy resin or novolac epoxy resin
  • the oligomer is C5 petroleum resin or C9 petroleum resin
  • the epoxy resin is bisphenol A epoxy resin.
  • the resin used is epoxy resin E44 or novolac epoxy resin F51
  • the oligomer used is C5 petroleum resin or C9 petroleum resin
  • the epoxy resin used is epoxy resin E44.
  • the voltage of the pulsed magnetic field is 200-400V, and the frequency is 10-20Hz.
  • the voltage used is 200V or 400V, and the frequency used is 10Hz.
  • the solid particles are glass beads or quartz sand.
  • the particle size of the glass beads is selected as 25 ⁇ m in the embodiment, and the mesh number of the quartz sand is selected as 100 mesh.
  • cobalt powder is provided by Aladdin Reagent Co., Ltd.
  • epoxy resin E44 is provided by Nantong Xingchen Synthetic Materials Co., Ltd.
  • novolac epoxy resin F51 is provided by Shandong Deyuan Epoxy Co., Ltd.
  • C5 petroleum resin and C9 petroleum resin Provided by Nanjing Rongda Resin Co., Ltd.
  • the adhesive layer slurry mix C5 petroleum resin and epoxy resin E44 at a mass ratio of 5:1.
  • the unsprayed side of the block is combined, the unsprayed side of the third block is combined with the sprayed insulating layer and the adhesive layer of the second block, placed on the clip tool and clamped under pressure, cured at 300 ° C for 2 hours, and naturally cooled to Room temperature is fine.
  • the adhesive layer slurry mix C9 petroleum resin and epoxy resin E44 at a mass ratio of 6:1.
  • the unsprayed side of the block is combined, the unsprayed side of the third block is combined with the sprayed insulating layer and the adhesive layer of the second block, placed on the clip tool and clamped under pressure, cured at 300 ° C for 2 hours, and naturally cooled to Room temperature is fine.
  • the operation process of this embodiment and embodiment 1 is basically the same, and the difference is that the mass ratio of epoxy resin E44 and cobalt powder is 70:2.5, and C5 petroleum resin and epoxy resin E44 are mixed with mass ratio of 7.5:1, and the rest The operation process is the same.
  • Example 1 Taking Example 1 as a reference, this comparative example does not add glass beads, and the rest of the operation process is the same.
  • Example 2 Taking Example 2 as a reference, this comparative example does not add cobalt powder, and the rest of the operation process is the same.
  • This comparative example takes Example 3 as a reference, and the difference is that the epoxy resin E44 in "mixing epoxy resin E44 and cobalt powder at a mass ratio of 60:1.5" is changed to polyurethane resin, and its average molecular weight is 2000.
  • Example 3 >1000 Comparative example 1 ⁇ 1 Comparative example 2 >1000 Comparative example 3 >800
  • the resistance in Table 1 refers to the resistance of the sprayed insulating layer and adhesive layer between two adjacent NdFeB magnets.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Abstract

本发明提供了一种钕铁硼磁体切割后的处理方法，涉及一种磁体加工技术领域。将钕铁硼磁体切割成N块钕铁硼磁体，N是大于等于2的自然数，将绝缘层浆料在脉冲磁场中处理后，喷涂到切割成的N-1个钕铁硼磁体表面上形成绝缘层，在500-800℃下烧结固化1.5-3h，再将粘接层浆料喷涂到绝缘层上形成粘接层，然后放置在夹片工具上加压夹紧，300-400℃固化1-3h，自然冷却至室温即可；本发明通过将钕铁硼磁体分块，在分块后的钕铁硼磁体上喷涂绝缘层浆料，实现各个钕铁硼磁体之间绝缘的目的，通过粘接剂实现各个钕铁硼磁体的牢固粘接，进而降低钕铁硼磁体内的涡流，同时通过钴粉渗入到钕铁硼磁体中，有效提高了钕铁硼磁体的矫顽力。

Description

一种钕铁硼磁体切割后的处理方法
本申请要求于2021年08月02日提交的申请号为202110882592.4，发明名称为“一种钕铁硼磁体切割后的处理方法”的中国专利申请的优先权，其通过引用方式全部并入本申请。
【技术领域】
本发明涉及一种磁体加工技术领域，具体涉及一种钕铁硼磁体切割后的处理方法。
【背景技术】
钕铁硼磁体材料自从问世以来，以其优良的物理性能广受人们关注。钕铁硼磁体材料因具有高矫顽力、高导电性、高磁积能等优良性能而被广泛应用于各大领域，包括发电机、通讯设备、医疗器械和航空航天。为了能够提升钕铁硼的性能，现有技术中大多在研究如何提升钕铁硼磁体的矫顽力等，却忽略了钕铁硼磁体材料在应用中存在的问题。
钕铁硼磁体内存在涡流，如果其应用在电机中，则随着电机功率的提高，钕铁硼磁体的体积会变大，进而会引发温度升高，最坏情况下可能会导致钕铁硼磁体材料退磁，从而大大降低了电机的性能。
现有技术中，通常采用粘接剂将多片烧结钕铁硼磁体材料进行粘接，从而提高烧结钕铁硼之间的绝缘性能，进而降低涡流。但现有技术中的方案存在着多片烧结钕铁硼之间的绝缘性能不佳，粘接效果不好，导致降低烧结钕铁硼磁体涡流的效果不佳，且还可能导致钕铁硼磁体矫顽力下降的负面效果。
【发明内容】
针对现有技术中的问题，本发明提出了一种钕铁硼磁铁切割后的处理方法，通过在钕铁硼磁体表面形成绝缘层和粘接层，不仅能将各个钕铁硼磁体之间绝缘以及牢固粘接，还能提高钕铁硼磁体的矫顽力。
为了实现上述目的，本发明通过以下技术方案予以实现：
一种钕铁硼磁体切割后的处理方法，将钕铁硼磁体切割成N块钕铁硼磁体， N是大于等于2的自然数，将绝缘层浆料在脉冲磁场中处理后，喷涂到切割成的N-1块钕铁硼磁体表面上，然后在500-800℃下烧结固化1.5-3h，再将绝缘层上喷涂粘接层浆料后放置在夹片工具上加压夹紧，300-400℃固化1-3h，自然冷却至室温即可；
所述绝缘层浆料的原料为树脂、钴粉和固体颗粒；
所述粘接层浆料的原料为齐聚物和环氧树脂。
优选地，所述树脂、钴粉的质量比为(60-80)：(1.5-3)，所述固体颗粒的用量为树脂和钴粉总量的2-4％。
优选地，所述环氧树脂和齐聚物的质量比为1：(5-8)。
优选地，所述树脂为双酚A环氧树脂或酚醛环氧树脂，所述齐聚物为石油树脂，所述环氧树脂为双酚A环氧树脂。
优选地，所述石油树脂为C5石油树脂或C9石油树脂。
优选地，所述脉冲磁场的电压为200-400V，频率10-20Hz。
优选地，所述固体颗粒为玻璃珠或石英砂。
本申请发明人提出了一种钕铁硼磁铁切割后的处理方法，通过在钕铁硼磁体上喷涂绝缘层涂料，实现各个钕铁硼磁体之间绝缘的目的，通过粘接剂实现各个钕铁硼磁体的牢固粘接，通过钴粉渗入到钕铁硼磁体中，有效提高钕铁硼磁体的矫顽力。
本申请发明人发现，钕铁硼磁体在使用中存在涡流现象，通过将钕铁硼分块来解决这个问题。将钕铁硼磁体分块后，等同于其等效电阻的增加，钕铁硼磁体被分割成N段后，就会多出N个等效电阻，进而实现磁体涡流的降低。但在分块后，要保证钕铁硼磁体之间绝对实现绝缘效果，同时牢固粘接在一起，不降低磁体性能。
在钕铁硼磁体的研究领域中，步骤的差别或原料的不同，都会对钕铁硼磁体的性能造成明显的差异。本发明中，在绝缘层浆料中加入钴粉，这是在降低钕铁硼磁体涡流的技术领域中没有使用过的技术方案。在脉冲磁场的作用下，绝缘层浆料中的晶粒能更好地被细化，溶解在绝缘层浆料中的钴粉会更加均匀地分布其中，此方法能避免加入聚合物分散剂，减少有机污染物的排出。然后在500℃-800℃下进行高温扩散，此举既能使得涂料中的钴粉较好地渗入到钕铁 硼磁体中，进而提高钕铁硼磁体的矫顽力，也能使得绝缘层起到更好的绝缘效果。
本发明中，粘接剂选用齐聚物和环氧树脂的混合物，将两种物质混合能起到较好的粘接效果。齐聚物是一种粘稠状液体或半固体，可以进行固化反应，且通过其官能团反应，物质状态可由液体变成固体。在和环氧树脂混合时，不需要使用醇类、丙酮类等溶剂进行溶解，减少有机污染物的排出，有利于保护环境。
与现有技术相比，本发明具有以下有益效果：
将钕铁硼磁体切割分块，在分块后的钕铁硼磁体中喷涂绝缘层浆料，绝缘层浆料中的固体颗粒起到较好的绝缘效果，绝缘层浆料中的钴粉通过高温后能渗入钕铁硼磁体的晶格中，显著提高粘接后的钕铁硼磁体的矫顽力。齐聚物和环氧树脂的使用，既能起到良好的粘接作用，还能减少对环境的污染，保护环境。通过将钕铁硼磁体分块，然后将钕铁硼磁体之间进行绝缘粘接，能降低钕铁硼使用过程中产生的涡流。
本发明的其他特征和优点将在随后的具体实施方式中予以详细说明。
【具体实施方式】
为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解，下面结合具体实施例，进一步阐明本发明。
一种钕铁硼磁体切割后的处理方法，将钕铁硼磁体切割成N块钕铁硼磁体，N是大于等于2的自然数，将绝缘层浆料在脉冲磁场中处理后，喷涂到切割成的N-1块钕铁硼磁体表面上，形成绝缘层，在500-800℃下烧结固化1.5-3h，再将粘接层浆料喷涂到绝缘层上，形成粘接层，然后放置在夹片工具上加压夹紧，300-400℃固化1-3h，自然冷却至室温即可；
所述绝缘层浆料的原料为树脂、钴粉和固体颗粒；
所述粘接层浆料的原料为齐聚物和环氧树脂。
本发明中，选用一块钕铁硼磁体，所选用的钕铁硼磁体由东阳磁体厂提供，所用牌号为N35。将钕铁硼磁体进行切割成N片，N≥2。在切割后的钕铁硼磁 体进行前处理，包括清洗、超声等常规操作，然后再进行喷涂等各项操作。
本发明中，所述树脂和钴粉的质量比为(60-80)：(1.5-3)，所述固体颗粒的用量为树脂和钴粉总量的2-4％。本发明实施例中，所用的树脂和钴粉的质量比为60:1.5、65:2或70:2.5，所述固体颗粒的用量为树脂和钴粉总量的2.5％或3％。
本发明中，所述环氧树脂和齐聚物的质量比为1：(5-8)，本发明实施例中，所用的环氧树脂和齐聚物的质量比为1:5、1:6或1:7.5。
本发明中，所述树脂为双酚A环氧树脂或酚醛环氧树脂，所述齐聚物为C5石油树脂或C9石油树脂，所述环氧树脂为双酚A型环氧树脂。在本发明实施例中，所用的树脂为环氧树脂E44或酚醛环氧树脂F51，所用齐聚物为C5石油树脂或C9石油树脂，所用环氧树脂为环氧树脂E44。
本发明中，所述脉冲磁场的电压为200-400V，频率10-20Hz，本发明实施例中，所用电压为200V或400V，所用频率为10Hz。
本发明中，所述固体颗粒为玻璃珠或石英砂。玻璃珠的粒度在实施例中选取25μm，石英砂的目数选取100mesh。
以下实施例中，钴粉由阿拉丁试剂有限公司提供，环氧树脂E44由南通星辰合成材料有限公司提供，酚醛环氧树脂F51由山东德源环氧有限公司提供，C5石油树脂和C9石油树脂由南京市荣达树脂有限公司提供。
实施例1
将钕铁硼磁体切割成3块钕铁硼磁体，接着配置绝缘层浆料：将环氧树脂E44和钴粉以60:1.5的质量比混合，然后添加玻璃珠，玻璃珠的添加量为环氧树脂E44和钴粉总量的2.5％，浆料配置完成。将绝缘层浆料在脉冲磁场中处理，所用电压为200V，所用频率为10Hz，处理60min即可。将处理后的绝缘层浆料喷涂到第1块和第2块钕铁硼磁体的上表面上，形成绝缘层，在600℃下烧结固化2h。
接着配置粘接层浆料：将C5石油树脂和环氧树脂E44以质量比为5：1混合。将配置好的粘接层浆料喷涂到第1块和第2块钕铁硼磁体绝缘层上，形成粘接层，然后第1块上涂有绝缘层和粘接层的磁体面和第2块未喷涂的一面结合，第3块中未喷涂的一面和第2块中喷涂过绝缘层和粘接层的结合，放置在夹片工具上加压夹紧，300℃固化2h，自然冷却至室温即可。
实施例2
将钕铁硼磁体切割成3块钕铁硼磁体，接着配置绝缘层浆料：将酚醛环氧树脂F51和钴粉以65:2的质量比混合，然后添加石英砂，石英砂的添加量为酚醛环氧树脂F51和钴粉总量的3％，浆料配置完成。将绝缘层浆料在脉冲磁场中处理，所用电压为400V，所用频率为10Hz，处理60min即可。将处理后的绝缘层浆料喷涂到第1块和第2块钕铁硼磁体表面上，形成绝缘层，在600℃下烧结固化3h。
接着配置粘接层浆料：将C9石油树脂和环氧树脂E44以质量比为6：1混合。将配置好的粘接层浆料喷涂到第1块和第2块钕铁硼磁体绝缘层上，形成粘接层，然后第1块上涂有绝缘层和粘接层的磁体面和第2块未喷涂的一面结合，第3块中未喷涂的一面和第2块中喷涂过绝缘层和粘接层的结合，放置在夹片工具上加压夹紧，300℃固化2h，自然冷却至室温即可。
实施例3
本实施例和实施例1的操作过程基本相同，不同的是，环氧树脂E44和钴粉的质量比为70:2.5，C5石油树脂和环氧树脂E44以质量比为7.5：1混合，其余操作过程相同。
对比例1
以实施例1为参照，本对比例不添加玻璃珠，其余操作过程相同。
对比例2
以实施例2为参照，本对比例不添加钴粉，其余操作过程相同。
对比例3
本对比例以实施例3为参照，不同的是，“将环氧树脂E44和钴粉以60:1.5的质量比混合”中的环氧树脂E44改成聚氨酯树脂，其平均分子量为2000。
将实施例1-3和对比例1-3得到的粘接后的钕铁硼磁体进行电阻值测定和矫顽力测定，得到的结果见表1和表2.
表1实施例1-3和对比例1-3电阻值测定结果
组别 电阻(MΩ)
实施例1 >1000
实施例2 >1000
实施例3 >1000
对比例1 <1
对比例2 >1000
对比例3 >800
注：表1中的电阻指两片相邻钕铁硼磁铁之间喷涂的绝缘层和粘接层的电阻。
表2实施例1-3和对比例1-3矫顽力测定结果
组别 矫顽力(KOe)
商用牌号N35 11.95
实施例1 15.62
实施例2 16.23
实施例3 16.25
对比例1 15.63
对比例2 11.86
对比例3 16.22
通过表1和表2中的数据可知，在经过本发明的技术方案处理被切割分块的钕铁硼磁体后，粘接后的钕铁硼磁体绝缘性能较佳，同时矫顽力有所提升。
以上显示和描述了本发明的基本原理、主要特征和本发明的特点。本行业的技术人员应该了解，本发明不受上述实施例的限制，上述实施例和说明书中描述的只是说明本发明的原理，在不脱离本发明精神和范围的前提下，本发明还会有各种变化和改进，这些变化和改进都落入要求保护的本发明的范围内。本发明要求保护的范围由所附的权利要求书及其等效物界定。

Claims (7)

  1. 一种钕铁硼磁体切割后的处理方法，其特征在于，将钕铁硼磁体切割成N块钕铁硼磁体，N是大于等于2的自然数，将绝缘层浆料在脉冲磁场中处理后，喷涂到切割成的N-1个钕铁硼磁体表面上形成绝缘层，在500-800℃下烧结固化1.5-3h，再将粘接层浆料喷涂到绝缘层上形成粘接层，然后放置在夹片工具上加压夹紧，300-400℃固化1-3h，自然冷却至室温即可；
    所述绝缘层浆料的原料为树脂、钴粉和固体颗粒；
    所述粘接层浆料的原料为齐聚物和环氧树脂。
  2. 根据权利要求1所述的钕铁硼磁体切割后的处理方法，其特征在于，所述树脂和钴粉的质量比为(60-80)：(1.5-3)，所述固体颗粒的用量为树脂和钴粉总量的2-4％。
  3. 根据权利要求1所述的钕铁硼磁体切割后的处理方法，其特征在于，所述环氧树脂和齐聚物的质量比为1：(5-8)。
  4. 根据权利要求1所述的钕铁硼磁体切割后的处理方法，其特征在于，所述树脂为双酚A环氧树脂或酚醛环氧树脂，所述齐聚物为石油树脂，所述环氧树脂为双酚A型环氧树脂。
  5. 根据权利要求4所述的钕铁硼磁体切割后的处理方法，其特征在于，所述石油树脂为C5石油树脂或C9石油树脂。
  6. 根据权利要求1所述的钕铁硼磁体切割后的处理方法，其特征在于，所述脉冲磁场的电压为200-400V，频率为10-20Hz。
  7. 根据权利要求1所述的钕铁硼磁体切割后的处理方法，其特征在于，所述固体颗粒为玻璃珠或石英砂。
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