CN1036101A - 硬磁材料 - Google Patents

硬磁材料 Download PDF

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Publication number
CN1036101A
CN1036101A CN89101680A CN89101680A CN1036101A CN 1036101 A CN1036101 A CN 1036101A CN 89101680 A CN89101680 A CN 89101680A CN 89101680 A CN89101680 A CN 89101680A CN 1036101 A CN1036101 A CN 1036101A
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CN
China
Prior art keywords
hard magnetic
magnetic material
present
compound
praseodymium
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CN89101680A
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English (en)
Inventor
德克·巴斯蒂恩·迪·莫尔
库尔特·海因茨·朱尔跟·巴斯乔
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Koninklijke Philips NV
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Philips Gloeilampenfabrieken NV
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Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of CN1036101A publication Critical patent/CN1036101A/zh
Pending legal-status Critical Current

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    • 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
    • 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
    • H01F1/058—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IVa elements, e.g. Gd2Fe14C

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

一种具有组成为RE2Fe14-xMnxC的硬磁材料， 其中RE是至少一个选自钕(Nd)、镨(Pr)、铈(Ce)和 镧(La)的元素，以及其中0.2≤X≤2。

Description

本发明涉及一种含有稀土金属、铁和碳的硬磁材料。本发明还涉及一种以硬磁材料为基体的磁体。
从公开的文献中，特别是发表在J.Appl.Phys.61，3574-3576（1987）的描述中已知一种类型的硬磁材料。文章的作者把其中所述的Nd2Fe14C化合物归类为不稳定的物质。因而，该材料不能被用为永久磁体的原料。
本发明的目的是提供一种含有稀土金属（RE）、铁和碳的硬磁材料，而它是稳定的。按照本发明通过采用一种硬磁材料而达到这个目的，该材料进一步特征为含有相当于化学式，RE2Fe14-xMnxC的组成的硬磁物相。其中RE是至少一种选自钕（Neodymium）、镨（Praseodymium）、铈（Cerium）和镧（Lanthanum）的元素，以及其中0.2≤X≤2。已经发现X的值是不能随意选择的。已发现，X值小于0.2的材料则是不够稳定的。X值大于2的材料的居里温度大约是室温或低于室温，这样的材料用于磁性材料的应用是有问题的。原则上，通过以钴替代存在于材料中的部分铁可以提高其居里温度。按照本发明在化合物中没有硼存在是一个优点，因为在制备该化合物时不会形成有毒的、挥发性的硼化合物。
在实验中已进一步证实按照本发明的化合物的硬磁物相具有ThMn12型的四面体晶体结构，这和已知的Nd2Fe14B的结构相当。如下表所示，按照本发明的化合物的居里温度（Tc）是在300和550K之间。按照本发明具有相同的稀土金属的化合物当其含锰量较高时其居里温度是较低的。
表
化合物    居里温度（K）
Nd2Fe13.7Mn0.3C 505
Nd2Fe13.5Mn0.5C 492
Nd2Fe13MnC 452
Nd2Fe12.5Mn1.5C 400
Nd2Fe12Mn2C 355
Pr2Fe13.7Mn0.3C 481
Pr2Fe13.5Mn0.5C 460
Pr2Fe13MnC 412
Pr2Fe12Mn2C 306
可通过常用方法来制备本发明的硬磁材料，即通过将相当于组成的化学式的比率的各合适的起始材料一起熔融，然后在一种保护气体或真空中，在温度范围为800℃-950℃内经过退火处理;而在处理时发生重结晶。
应该指出，通过本发明的实验，可证实申请人基本上可制得具有相应化学式为Nd2Fe14C组成的硬磁物相的稳定材料。通过将组成化学式为Nd2Fe14C的铸件在一个较小的温度区间（优选在850-880℃）经过长时间的退火处理即可达到目的;而在处理时发生重结晶。申请人有理由相信，与已知方法比较，按照本发明方法，为了得到所需的四面体结构的重结晶作用的退火处理时间较短。此外，按照本发明的材料退火处理能够在较大的温度范围内进行。另一方面，可通过将化学式为Nd2Fe14C的组合物熔融拉丝，继之将所形成的带状物进行退火处理，而在处理中发生重结晶，也能够得到稳定的材料。但两种已知的方法都有缺点，从经济观点来看是不太适宜的。
按照本发明的化合物的硬磁性质与以Nd2Fe14B为基体的材料相当。例如，在室温下，Nd2Fe13.7Mn0.3C粉末测得的磁化强度大约为100Am2/kg。这个数值是可以与在室温下，Nd2Fe14B的粉末测得的饱和磁化强度相当。应当指出，该数值是不能认为是饱和磁化强度，由于所研的材料的磁各向异性的是很显著的。
在将所得到的材料粉碎之后，以通常的方法从所述的材料可以生产各种形体形状的磁体。

Claims (3)

1、一种含有稀土金属、铁和碳的硬磁材料，其特征在于：该材料含有相当于化学式RE2Fe14-x、MnxC的组成的硬磁物相，其中，RE是至少一种选自钕(Neodymium)、镨(Praseodymium)、铈(Cerium)和镧(Lanthanum)的元素，以及其中0.2≤X≤2。
2、按照权利要求1的硬磁材料，其特征在于以钴代替存在于材料中的部分的铁。
3、按照权利要求1所述的硬磁材料为基体的一种永久磁体。
CN89101680A 1988-03-24 1989-03-20 硬磁材料 Pending CN1036101A (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8800739 1988-03-24
NL8800739A NL8800739A (nl) 1988-03-24 1988-03-24 Hardmagnetisch materiaal.

Publications (1)

Publication Number Publication Date
CN1036101A true CN1036101A (zh) 1989-10-04

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Family Applications (1)

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CN89101680A Pending CN1036101A (zh) 1988-03-24 1989-03-20 硬磁材料

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EP (1) EP0334445A1 (zh)
JP (1) JPH028345A (zh)
KR (1) KR890015303A (zh)
CN (1) CN1036101A (zh)
NL (1) NL8800739A (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5478411A (en) * 1990-12-21 1995-12-26 Provost, Fellows And Scholars Of The College Of The Holy And Undivided Trinity Of Queen Elizabeth Near Dublin Magnetic materials and processes for their production

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Publication number Publication date
NL8800739A (nl) 1989-10-16
KR890015303A (ko) 1989-10-28
EP0334445A1 (en) 1989-09-27
JPH028345A (ja) 1990-01-11

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