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Magnetic material, use thereof and method for the production thereof

A technology of magnetic materials and hard magnetic phases, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of expensive, time-consuming manufacturing, etc., and achieve the effects of high remanence, large energy product, and reduced structural space

Active Publication Date: 2015-04-29
ROBERT BOSCH GMBH
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  • Description
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Problems solved by technology

Disadvantages of such sintered magnets are that their manufacture is time-consuming, relatively expensive, and also due to their high concentration required by the accumulation of rare earth metals within the grain boundary phase
A further disadvantage is that the production-dependent microstructure consisting of crystals, crystallites or grains separated by grain boundaries limits the remanence to a maximum of approximately 1.3 Tesla

Method used

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  • Magnetic material, use thereof and method for the production thereof

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Embodiment Construction

[0021] figure 1 A schematic diagram showing the microstructure of a preferred embodiment of the magnetic material 10 according to the invention. The magnetic material 10 according to the present invention comprises Nd 2 Fe 14 A hard magnetic phase 1 composed of B, a soft magnetic phase 2 composed of α-Fe, and a grain boundary phase 3 substantially composed of copper. In this case, the proportion of soft magnetic phase 2 is 20% by mass and the proportion of copper is 2% by mass, respectively relative to the total mass of magnetic material 10 . This magnetic material 10 is manufactured as follows:

[0022] For Nd produced by the standard melt-spin method 2 Fe 14 The B powder is added with 20% by mass of α-Fe and 2% by mass of copper with respect to the total mass of the magnetic material 10, respectively, and is produced at approximately 60° C. at 150 revolutions per minute by means of a planetary ball mill under protective gas (argon). The mixture was wet milled for 10 ho...

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Abstract

The present invention relates to a magnetic material which comprises a hard magnet phase (1), at least one soft magnet phase (2) and a grain boundary phase (3), wherein at least one hard magnet phase (1) contains at least one transition metal, at least one rare earth metal and boron, wherein the magnetic material (10) contains copper and wherein the copper is arranged substantially in the grain boundary phase (3).

Description

technical field [0001] The present invention relates to a magnetic material, the application of the magnetic material and a method for manufacturing the magnetic material. Background technique [0002] Owing to the recent increased use of electric motors, especially in automotive engineering and also in other fields which have only very limited installation space, the demand for highly efficient magnetic materials has grown considerably in recent years. Magnetic materials that are particularly suitable for this are characterized by high remanence, a large coercive field, which is a measure of the demagnetization strength of the magnetic material, and a large energy product. However, not only the final physical, chemical and in particular magnetic properties of the magnetic material but also its production outlay are important. In principle, in magnetic materials, a distinction is made between sintered magnets and rapidly quenched magnets, and therein in particular exchange-...

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Application Information

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IPC IPC(8): H01F1/057
CPCB22F2009/041C22C28/00C22C2202/02H01F1/0579
Inventor L·博默J·奥伯勒A·胡贝尔
Owner ROBERT BOSCH GMBH