CN105895360A - 各向异性磁体的制备方法 - Google Patents

各向异性磁体的制备方法 Download PDF

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CN105895360A
CN105895360A CN201610458506.6A CN201610458506A CN105895360A CN 105895360 A CN105895360 A CN 105895360A CN 201610458506 A CN201610458506 A CN 201610458506A CN 105895360 A CN105895360 A CN 105895360A
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magnet
mold cavity
magnetic field
powder
magnetic
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赵立文
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Dongguan Haitian Magnetic Industry Co Ltd
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Dongguan Haitian Magnetic Industry Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00Apparatus 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
    • H01F41/02Apparatus 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
    • H01F41/0253Apparatus 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
    • H01F41/0273Imparting anisotropy
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032Magnets 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
    • H01F1/04Magnets 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
    • H01F1/047Alloys characterised by their composition
    • H01F1/053Alloys characterised by their composition containing rare earth metals
    • H01F1/055Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • H01F1/0571Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
    • H01F1/0575Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
    • H01F1/0578Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together bonded together
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00Apparatus 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
    • H01F41/02Apparatus 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
    • H01F41/0253Apparatus 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
    • H01F41/0266Moulding; Pressing

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

Abstract

一种各向异性磁粉的制备方法,该方法包括如下步骤:a、将钕铁硼磁粉与粘接剂混合成的磁体原料充填入模具腔中;b、将磁体原料在无磁场状态下在模腔中预压成形;c、将预压成形件取出并破碎还原成粉末,然后将破碎还原成的粉末再次装入模具腔中;d、以永磁铁作为磁场源,自模具腔外对模具腔内的磁体原料施加取向磁场;e、将经磁场取向后的磁体原料在单位压力为5~7T/cm2,温度为130~160℃的条件下按模具腔成形;f、将成形的磁体从模具腔取出,并施加与所述取向磁场反向的减磁磁场;g、在压力为常压,温度为180~200℃保持30‑50分钟,使磁体固化成形;h、将固化成形的磁体进行充磁,形成各向异性磁体。本发明具有工艺简单,易于实施,制作的磁体性能优异等特点。

Description

各向异性磁体的制备方法
【技术领域】
本发明涉及永久磁铁磁体的制备方法,特别是涉及一种各向异性磁体的制备方法。
【背景技术】
人们知道,钕铁硼磁铁是迄今为止磁力最强的永久磁铁,其作为第三代稀土永磁材料,因具有很高的性能而广泛应用于能源、交通、机械、医疗、IT、家电等行业,特别是随着信息技术为代表的知识经济的发展,为钕铁硼稀土永磁功能材料及产业发展不断带来新的用途,并为钕铁硼产业带来更为广阔的市场前景。近年来,电子产品逐渐朝着小型化、薄型化、高性能化的方向发展,为此,对磁性材料也提出了相应的要求。然而,现有的磁粉生产技术由于批量生产稳定性差,磁场取向成型技术不过关以及磁体抗氧化及耐温性不足等而成为制约我国的各向异性粘结钕铁硼材料未能取得商业化成功的主要障碍。因此,无论从充分发掘稀土资源优势,还是从市场需求出发,研究和开发高磁性能的各向异性粘结钕铁硼材料都显得尤为必要和迫切。
粘结磁体凭借其形状自由度大,尺寸精度高,无需二次加工等优势,已成为现代高新技术产品不可或缺的重要元器件。目前市场上的粘接钕铁硼磁体基本上都是各向同性的,其磁能积远低于烧结钕铁硼磁体,多用于磁性能要求不高的场合,因而其应用受到了一定的限制。在电子设备的小型化、高性能化过程中,制备各向异性的小型、高尺寸精度的粘接磁体就成为一种客观需求。
【发明内容】
本发明旨在解决上述问题,而提供一种工艺简单,易于实施,制作的磁体性能优异的各向异性磁体的制备方法。
为实现上述目的,本发明提供一种各向异性磁粉的制备方法,该方法包括如下步骤:
a、将钕铁硼磁粉与粘接剂混合成的磁体原料充填入模具腔中;
b、将磁体原料在无磁场状态下在模腔中预压成形;
c、将预压成形件取出并破碎还原成粉末,然后将破碎还原成的粉末再次装入模具腔中;
d、以永磁铁作为磁场源,自模具腔外对模具腔内的磁体原料施加取向磁场;
e、将经磁场取向后的磁体原料在单位压力为5~7T/cm2,温度为130~160℃的条件下按模具腔成形;
f、将成型的磁体从模具腔取出,并施加与所述取向磁场反向的减磁磁场;
g、在压力为常压,温度为180~200℃保持30~50分钟,使磁体固化成形;
h、将固化成形的磁体进行充磁,形成各向异性磁体。
步骤a中,所述钕铁硼磁粉为各向异性钕铁硼磁粉。
步骤a中,所述粘接剂为树脂类粘接剂。
所述粘接剂为环氧树脂。
本发明的贡献在于,其提供了一种制备高性能各向异性磁体的方法。本发明通过在磁体原料充填工艺与对磁体原料施加取向磁场工艺之间设置了预压成形工艺,使得钕铁硼磁粉与粘接剂的结合更加充分紧密,因而更加有利于提高磁体的综合磁性能。本发明的方法工艺简单,易于实施,所制备的钕铁硼磁体具有广泛的应用市场。
【具体实施方式】
下列实施例是对本发明的进一步解释和说明,对本发明不构成任何限制。
本发明的各向异性磁粉的制备方法中,所述的磁粉为钕铁硼磁粉,该方法为各向异性钕铁硼磁粉制备方法。本发明的方法包括:
一、磁体原料预充填
将钕铁硼磁粉与粘接剂搅拌混合,形成磁体原料并充填入按客户要求所设计形状的模具腔中,其中,所述钕铁硼磁粉为各向异性钕铁硼磁粉,所述粘接剂为粘接剂为树脂类粘接剂,优选环氧树脂。
二、预压成形
将装有磁体原料的模具通过压力机进行预压成形,使得钕铁硼磁粉与粘接剂紧密结合。该预压成形过程在无磁场状态下进行。
三、磁体原料第二次充填
将预压成形件取出并破碎还原成粉末,然后将破碎还原成的磁体原料粉末再次装入模具腔中。
三、施加取向磁场
以置于模具腔外的永磁铁作为磁场源,自模具腔外对模具腔内的磁体原料施加取向磁场。
四、磁体压制成形
将经磁场取向后的磁体原料在单位压力为6T/cm2,温度为140℃的条件下按按所设计的模具腔成形成所需形状。
五、磁体成形
将成型的磁体从模具腔取出,并施加与所述取向磁场反向的减磁磁场,然后在压力为常压,温度为190℃保持40分钟,使磁体固化成形;
六、充磁
将固化成形的磁体进行充磁,形成各向异性磁体。

Claims (4)

1.一种各向异性磁体的制备方法,其特征在于,该方法包括如下步骤:
a、将钕铁硼磁粉与粘接剂混合成的磁体原料充填入模具腔中;
b、将磁体原料在无磁场状态下在模腔中预压成形;
c、将预压成形件取出并破碎还原成粉末,然后将破碎还原成的粉末再次装入模具腔中;
d、以永磁铁作为磁场源,自模具腔外对模具腔内的磁体原料施加取向磁场;
e、将经磁场取向后的磁体原料在单位压力为5~7T/cm2,温度为130~160℃的条件下按模具腔成形;
f、将成形的磁体从模具腔取出,并施加与所述取向磁场反向的减磁磁场;
g、在压力为常压,温度为180~200℃保持30~50分钟,使磁体固化成形;
h、将固化成形的磁体进行充磁,形成各向异性磁体。
2.如权利要求1所述的方法,其特征在于,步骤a中,所述钕铁硼磁粉为各向异性钕铁硼磁粉。
3.如权利要求1所述的方法,其特征在于,步骤a中,所述粘接剂为树脂类粘接剂。
4.如权利要求3所述的方法,其特征在于,所述粘接剂为环氧树脂。
CN201610458506.6A 2015-10-19 2016-06-21 各向异性磁体的制备方法 Pending CN105895360A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107256791A (zh) * 2017-05-13 2017-10-17 安徽大地熊新材料股份有限公司 一种异形磁路磁体的制备方法
CN111799082A (zh) * 2020-07-10 2020-10-20 瑞声科技(南京)有限公司 一种布粉装置及其布粉方法、NdFeB系烧结磁体的制造方法

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Publication number Priority date Publication date Assignee Title
JPH05159914A (ja) * 1991-12-11 1993-06-25 Tokin Corp 異方性ボンド磁石の製造方法
CN1710673A (zh) * 2005-07-18 2005-12-21 四川大学 模压高密度粘结钕铁硼磁体的制作方法
CN101599333A (zh) * 2009-04-28 2009-12-09 横店集团东磁股份有限公司 干压成型各向异性多极磁环的制造方法
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107256791A (zh) * 2017-05-13 2017-10-17 安徽大地熊新材料股份有限公司 一种异形磁路磁体的制备方法
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CN111799082A (zh) * 2020-07-10 2020-10-20 瑞声科技(南京)有限公司 一种布粉装置及其布粉方法、NdFeB系烧结磁体的制造方法

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Application publication date: 20160824