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Magnetic material and method for producing same

A technology of magnetic materials and soft magnetic materials, which is applied in the manufacturing of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., to achieve the effect of reducing process costs

Inactive Publication Date: 2014-06-04
ROBERT BOSCH GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the magnetic material obtained in this way has a relatively small residual magnetization and a grain size of 300 nm and larger after desorption and recombination due to isotropy

Method used

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  • Magnetic material and method for producing same
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  • Magnetic material and method for producing same

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Embodiment Construction

[0046] Refer below figure 1 A conventional HDDR method is described.

[0047] as from figure 1 It can be seen that the HDDR method 10 includes reaction steps: hydrogenation 1 , disproportionation 2 , desorption 3 and recombination 4 . In hydrogenation step 1, at a temperature raised to 840° C., for example to Nd with a primary particle size of, for example, about 50 to 100 μm 2 Fe 14 Block B transports hydrogen. Here, the hydrogen partial pressure is increased to 30 kPa in this system, where the disproportionation of the raw materials and thus the NdH 2 , Fe and Fe 2 Formation of B. The hydrogen partial pressure is maintained until an equilibrium occurs where multiple phases exist, that is, except for NdH 2 NdH 2+x , such as NdH 3 (over stoichiometric intermediates). The composition of the reaction mixture is determined by means of customary methods (eg X-ray diffraction measurements). In the following desorption and recombination steps 3 and 4, the temperature wa...

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Abstract

The invention relates to a method for producing a magnetic material, said magnetic material consisting of a starting material that comprises a rare earth metal (SE) and at least one transition metal. The method has the following steps: hydrogenating the starting material, disproportioning the starting material, desorption, and recombination. A magnetic field is applied during at least one step such that a textured magnetic material is obtained and the formation of a texture is promoted in the magnetic material.

Description

technical field [0001] The invention relates to a magnetic material and a method for producing the same. Background technique [0002] Magnetic materials and methods for their production are known from the prior art. Fine-grained, so-called nanocrystalline magnetic powders are obtained, for example, by ball milling or rapid solidification followed by thermal compression or thermal deformation, or by "exchange coupling or excessive remanence". Disadvantages of this are the complex processing of the raw alloy and the generally low energy density and remanent magnetization of the magnetic material obtained. Furthermore, DE 197 52 366 A1 describes a method for producing hard magnetic samarium-cobalt substrates by means of the HDDR process (Hydrierung-Disproportionierung-Desorption-Rekombination, Hydrogenation-Disproportionierung-Desorption-Recombination), wherein at a hydrogen pressure of more than Disproportionation is performed at 0.5 MPa and at a temperature of 500°C to 900...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057
CPCC21D2201/03H01F1/0579H01F1/0553C22C38/12C22C38/005H01F1/0573C22C33/0207C22C38/002C22C2202/02B22F2999/00B22F9/023B22F2202/05C01B35/04H01F1/01H01F41/00
Inventor K.居特O.古特弗莱施
Owner ROBERT BOSCH GMBH