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Anisotropic rare earth sintered magnet and making method

A sintered magnet, anisotropic technology, applied in the field of preparation

Inactive Publication Date: 2012-05-23
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no method capable of analyzing the entire three-dimensional surface of sintered particles with micron-scale dimensions on the nanoscale

Method used

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  • Anisotropic rare earth sintered magnet and making method
  • Anisotropic rare earth sintered magnet and making method

Examples

Experimental program
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Embodiment 1-11

[0046] The amounts of Nd metal, electrolytic iron, ferroboron and additive elements (including additional rare earth metals) were weighed so as to satisfy the composition shown in Table 1. The starting material was loaded into an alumina crucible and placed into a high-frequency melting furnace, where a NdFeB alloy was prepared. The alloy was coarsely crushed on a Jaw Crusher and a Brown Mill and ground to NdFeB fine particles with an average particle size of 3 μm in a Jet Mill under conditions that minimized oxidation. The fine powder is loaded into a press. While applying a magnetic field by a static magnetic field coil and a pulsed magnetic field coil for biaxial magnetic field orientation, at 1.2t / cm 2 The powder is compacted under pressure to form a biaxially oriented compact. The static magnetic field has a strength of 1.5 T and lasts for a period of 30 seconds. The vertical pulsed magnetic field has a peak strength of 2T, the rise time before the peak magnetic field ...

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Abstract

An anisotropic rare earth sintered magnet has a tetragonal R 2 Fe 14 B compound as a major magnetic phase, wherein R is Nd or a mixture of Nd with at least one rare earth element. Grains of the compound phase have two crystallographic axes, c and a-axes aligned. The biaxially aligned magnet exhibits a coercivity Hc of at least 1.6 MA / m.

Description

technical field [0001] The present invention relates to an anisotropic rare earth sintered magnet used in electric motors and the like, and a method for producing the same. Background technique [0002] Contains tetragonal Nd since its discovery in 1982 (JP-A S59-46008) 2 Fe 14 NbFeB magnets (abbreviated as Nd magnets) with B compound as the main phase have been used in many applications. Today, they are useful materials in the manufacture of electronic / electrical, transportation and industrial equipment. Despite some disadvantages including relatively low Curie temperature (~310°C) and poor corrosion resistance, Nd magnets have advantages including high saturation magnetization at room temperature, relatively cheap composition, relatively high mechanical strength. Nd magnets are superior to prior art 2-17SmCo magnets and have increasing fields of application. Among them, their application as in-vehicle components including electric motors and generators of electric veh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F7/02B22F3/16H02K15/00
CPCB22F2999/00H01F41/0273C22C2202/02C22C33/02H01F1/0577B22F3/02B22F2202/05
Inventor 大桥健
Owner SHIN ETSU CHEM CO LTD
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