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Anti-corrosion coating for nd2fe14b magnets

A technology of nd2fe14b, magnets, applied in the direction of coatings, magnets, magnetic objects, etc., can solve problems such as being susceptible to corrosion

Active Publication Date: 2018-06-19
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However by Nd 2 Fe 14 Magnets made of B have the disadvantage that they are susceptible to corrosion

Method used

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  • Anti-corrosion coating for nd2fe14b magnets
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  • Anti-corrosion coating for nd2fe14b magnets

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Embodiment Construction

[0025] figure 1 A cross-sectional view of a conventional magnet 10 is shown. Here, 1 is determined by Nd 2 Fe 14 The base material made of B, 3 is the second layer applied on the base material 1, wherein the second layer 3 itself is a three-layer structure with a layer sequence: Ni layer 3a-cu layer 3b-Ni layer 3c, where the second Each individual layer 3 a , 3 b , 3 c of the layer 3 completely surrounds the base material 1 . Such conventional magnets 10 are not sufficiently protected against corrosion, especially under the action of mechanical forces, for example caused by impacts or scratches.

[0026] figure 2 shows a schematic view of the first magnet 10 of the present invention, where 1 indicates that it is made of Nd 2 Fe 14 B is made of base material and 2 denotes the first layer applied on this base material 1 , namely the NiP alloy layer. The first layer 2 has a hardness of at least 400 HV and completely surrounds the base material 1 . The magnet 10 is distin...

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Abstract

The magnet (10) has a base material (1) consisting of neodymium iron boron. The base material is applied as a coating on a layer (2) having Vickers hardness of about 400 HV, preferably 500, 800 and 1000 HV. Middle layer thickness of the layer is in a range of about 0.5-50 micrometers, preferably 2-40 micrometers. The base material is applied as the coating on another layer, which is arranged between the former layer and the base material. The second layer comprises a multilayer structure i.e. triple layer structure, which comprises two nickel (Ni) layers and a copper (Cu) layer. The former layer is selected from a ceramic layer, an alumina layer, a silicon oxide layer, a titanium dioxide layer, an organically modified ceramic layer, a titanium nitride (TiN) layer, a diamond-like carbon (DLC) layer and a nickel phosphate (NiP) alloy layer. An independent claim is also included for a method for manufacturing a magnet.

Description

technical field [0001] The present invention relates to Nd 2 Fe 14 B Magnets made, and methods for their manufacture, and their applications. Background technique [0002] The magnet and its Nd 2 Fe 14 Permanent magnets made of B are known from the prior art. Due to its physical and especially its good magnetic properties, Nd 2 Fe 14 Magnets made of B are presently advantageous compared to conventional hard ferrites, since they have the potential to increase the power significantly and to reduce the installation space in all devices requiring magnets. However by Nd 2 Fe 14 Magnets made of B have the disadvantage that they are susceptible to corrosion. In the recent past, it has thus been developed for use by Nd 2 Fe 14 Anti-corrosion coating for magnets made of B, which usually consists of a three-layer structure consisting of two nickel layers (Ni layers) surrounding a copper layer (Cu layer). Nevertheless these protective layers can be formed on the base materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00C23C30/00H01F1/057H01F41/02
CPCH01F41/026H01F7/0221
Inventor T.耶格尔J.许茨J.盖斯勒A.维尔德
Owner ROBERT BOSCH GMBH