Composite bonded rare earth permanent magnet and preparation method thereof
A technology of rare earth permanent magnets and binders, which is applied in the fields of permanent magnets, inductors/transformers/magnets, and the magnetism of inorganic materials. Cost and usage reduction effect
Active Publication Date: 2016-05-11
徐霞
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Problems solved by technology
[0015] In order to overcome the technical defects that the existing rare earth permanent magnets are expensive to manufacture and the performance of the composite permanent magnet cannot meet the requirements, the invention discloses a composite bonded rare earth permanent magnet and a preparation method thereof
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[0041] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0042] Such as figure 1 A composite bonded rare earth permanent magnet shown includes a rare earth alloy permanent magnet material layer 1; also includes a base material layer 2 bonded with a rare earth alloy permanent magnet composite material layer, and the base material layer includes basic permanent magnet powder, binder and lubricant, and the mass percentage of the basic permanent magnetic powder is greater than 90%, and the magnetic energy product of the basic permanent magnetic powder is lower than that of the rare earth alloy permanent magnetic material layer.
[0043] The permanent magnets described in the present invention are mainly used in permanent magnet motors and similar structures, usually cylindrical magnetic rotors or tile-shaped magnetic stators. Taking permanent magnet motors as an example, after the armature is...
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The invention relates to a compound agglutinated rare earth permanent magnet and a preparation method thereof. The compound agglutinated rare earth permanent magnet comprises a rare earth alloy permanent-magnet material layer and a base material layer, wherein the base material layer is agglutinated with the rare earth alloy permanent-magnet material layer and comprises base permanent-magnet powder, agglomerant, and a lubricant, and the mass percent of the base permanent-magnet powder is greater than 90%, and the magnetic energy product of the base permanent-magnet powder is lower than that of the rare earth alloy permanent-magnet material layer. By adopting the compound agglutinated rare earth permanent magnet and the preparation method thereof provided by the invention, each indicator of magnetic performance of the compound agglutinated rare earth permanent magnet can be approximate to or reach that of a traditional agglutinated rare earth permanent magnet, and by virtue of reducing the usage amount of rare earth materials effectively, the material costs of rare earth permanent magnets are reduced greatly.
Description
technical field [0001] The invention belongs to the field of bonded permanent magnets, and relates to a new type of bonded permanent magnet material formed by compounding and bonding two or more permanent magnet materials and iron-based soft magnetic materials, in particular to a composite bonded rare earth permanent magnet and its preparation method. Background technique [0002] At present, bonded rare earth magnets are mainly made by mixing rare earth alloy powders such as NdFeB powders, samarium cobalt powders, and polymer binders, granulating, crushing, and making powders through cold pressing, hot pressing, injection and other processes (anisotropic Orientation required) composite production. [0003] Compared with traditional ferrite DC motors and AC motors, rare earth permanent magnets have excellent magnetic properties such as high remanence Br, high coercive force, high magnetic energy product (BH)max and linear demagnetization curve. Rare earth permanent magnet ...
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IPC IPC(8): H01F7/02H01F1/11H01F1/36H01F1/09H01F1/33H01F41/02
Inventor 徐霞陈传龙
Owner 徐霞