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1. WO2022006973 - NDFEB MAGNETIC POWDER, NDFEB SINTERED MAGNET AND PREPARATION METHOD THEREFOR

Publication Number WO/2022/006973
Publication Date 13.01.2022
International Application No. PCT/CN2020/102617
International Filing Date 17.07.2020
IPC
H01F 1/053 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
1Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
01of inorganic materials
03characterised by their coercivity
032of hard-magnetic materials
04metals or alloys
047Alloys characterised by their composition
053containing rare earth metals
H01F 1/057 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
1Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
01of inorganic materials
03characterised by their coercivity
032of hard-magnetic materials
04metals or alloys
047Alloys characterised by their composition
053containing rare earth metals
055and magnetic transition metals, e.g. SmCo5
057and IIIa elements, e.g. Nd2Fe14B
H01F 1/08 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
1Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
01of inorganic materials
03characterised by their coercivity
032of hard-magnetic materials
04metals or alloys
06in the form of particles, e.g. powder
08pressed, sintered, or bound together
B22F 3/16 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
3Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor
12Both compacting and sintering
16in successive or repeated steps
Applicants
  • 瑞声声学科技(深圳)有限公司 AAC ACOUSTIC TECHNOLOGIES (SHENZHEN) CO., LTD. [CN]/[CN]
  • 瑞声科技(南京)有限公司 AAC TECHNOLOGIES (NANJING) CO., LTD. [CN]/[CN]
Inventors
  • 王明波 WANG, Mingbo
  • 曾基灵 ZENG, Jiling
  • 李犇 LI, Ben
  • 孙欢 SUN, Huan
Agents
  • 深圳国新南方知识产权代理有限公司 SHENZHEN CHINA INNOVATION SOUTH INTELLECTUAL PROPERTY AGENCY CO., LTD.
Priority Data
202010662346.310.07.2020CN
Publication Language Chinese (zh)
Filing Language Chinese (ZH)
Designated States
Title
(EN) NDFEB MAGNETIC POWDER, NDFEB SINTERED MAGNET AND PREPARATION METHOD THEREFOR
(FR) POUDRE MAGNÉTIQUE DE NDFEB, AIMANT FRITTÉ DE NDFEB ET LEUR PROCÉDÉ DE PRÉPARATION
(ZH) NdFeB 系磁粉、 NdFeB 系烧结磁体及制备方法
Abstract
(EN) The present disclosure relates to the technical field of magnetic material, and in particular to an NdFeB magnetic powder, an NdFeB sintered magnet and a preparation method therefor. The NdFeB magnetic powder and the preparation method therefor improve the composition of the NdFeB magnetic powder, and does not carry out a dehydrogenation treatment after a hydrogen decrepitation process. The resulting NdFeB magnetic powder has a rare earth-rich grain boundary phase and low oxygen content, helping to reduce the loss of rare earth elements in the sintered magnet and inhibit grain growth during the sintering process. The structure of the sintered magnet is improved, and the magnetic performance and mechanical performance of the sintered magnet is enhanced. The resulting NdFeB magnetic powder has low average particle size, helping to further improve the mechanical performance of the sintered magnet.
(FR) La présente invention se rapporte au domaine technique des matériaux magnétiques et en particulier à une poudre magnétique de NdFeB, à un aimant fritté de NdFeB et à leur procédé de préparation. La poudre magnétique de NdFeB et son procédé de préparation améliorent la composition de la poudre magnétique de NdFeB et ne réalisent pas de traitement de déshydrogénation après un procédé de décrépitation d'hydrogène. La poudre magnétique de NdFeB résultante a une phase limite de grain riche en terres rares et une faible teneur en oxygène, ce qui aide à réduire la perte d'éléments des terres rares dans l'aimant fritté et à inhiber la croissance des grains pendant le processus de frittage. La structure de l'aimant fritté est améliorée, et les performances magnétiques ainsi que les performances mécaniques de l'aimant fritté sont améliorées. La poudre magnétique de NdFeB résultante a une taille de particule moyenne faible, ce qui aide à améliorer encore les performances mécaniques de l'aimant fritté.
(ZH) 涉及磁体材料技术领域,尤其涉及一种NdFeB系磁粉、NdFeB系烧结磁体及制备方法。NdFeB系磁粉及制备方法对NdFeB系磁粉的组分进行了改进,并在氢破碎工序之后没有进行脱氢处理,所得NdFeB系磁粉的晶界相为富稀土相且氧含量较低,有利于降低烧结磁体稀土元素的损失以及抑制烧结过程中晶粒长大,改善烧结磁体的组织结构,提升烧结磁体的磁性能和力学性能;同时,所得NdFeB系磁粉的平均粒径较小,有利于进一步提升烧结磁体的力学性能。
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