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Preparation method of sintered NdFeB magnet surface composite coating

A surface composite and NdFeB technology, which is applied in the coating and metal material coating process, can solve the problems of difficult control of the quality of the ceramic-based cladding layer, unsatisfactory matching, and multi-porosity of the coating to achieve excellent corrosion resistance Protective effect, increase film/substrate bonding strength, high bonding effect

Active Publication Date: 2019-04-19
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The following problems exist in the preparation of ceramic-based cladding layer directly on the surface of sintered NdFeB magnet: the matching between sintered NdFeB magnet and ceramic-based cladding layer is not ideal, the coating contains many pores, and is relatively brittle. The quality of the ceramic-based cladding layer is difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, a sintered NdFeB magnet (not magnetized, provided by Anhui Dadixiong New Materials Co., Ltd.) with a size of 24mm×16mm×3mm is used.

[0025] Magnet pretreatment: Degreasing the sintered NdFeB magnet with a degreasing solution at a temperature of 55°C and a pH value of 9 for 15 minutes; then pickling the sintered NdFeB magnet with 10 wt% nitric acid solution for 5 seconds; finally, ultrasonically cleaning the magnet in deionized water 2min.

[0026] Preparation of metal-based cladding materials: Cobalt-based alloy powder (particle size: 20 μm) and carbon fiber reinforced material (particle size: 60 nm) were mixed at a mass ratio of 40:1, and mechanically stirred for 6 hours.

[0027] Preparation of the metal-based cladding layer: the pretreated sintered NdFeB magnet and the prepared metal-based cladding material are placed in the plasma cladding equipment, and the metal-based cladding layer is prepared on the surface of the sintered NdFeB magnet. The...

Embodiment 2

[0032] In this embodiment, a sintered NdFeB magnet (not magnetized, provided by Anhui Dadixiong New Materials Co., Ltd.) with a size of 24mm×16mm×3mm is used.

[0033]Magnet pretreatment: Degreasing the sintered NdFeB magnet with a degreasing solution with a temperature of 75 °C and a pH value of 10 for 20 minutes; then pickling the sintered NdFeB magnet with 17 wt% nitric acid solution for 12 seconds; finally, ultrasonically cleaning the magnet in deionized water 3min.

[0034] Preparation of metal-based cladding materials: Cobalt-based alloy powder (particle size 110 μm) and carbon fiber reinforced material (particle size 130 nm) were mixed at a mass ratio of 60:1, and mechanically stirred for 8 hours.

[0035] Preparation of the metal-based cladding layer: the pretreated sintered NdFeB magnet and the prepared metal-based cladding material are placed in the plasma cladding equipment, and the metal-based cladding layer is prepared on the surface of the sintered NdFeB magnet. ...

Embodiment 3

[0040] In this embodiment, a sintered NdFeB magnet (not magnetized, provided by Anhui Dadixiong New Materials Co., Ltd.) with a size of 24mm×16mm×3mm is used.

[0041] Magnet pretreatment: Degreasing the sintered NdFeB magnet with a degreasing solution with a temperature of 95°C and a pH value of 13 for 25 minutes; then pickling the sintered NdFeB magnet with 24 wt% nitric acid solution for 20 seconds; finally, ultrasonically cleaning the magnet in deionized water 4min.

[0042] Preparation of metal-based cladding materials: Cobalt-based alloy powder (particle size 200 μm) and carbon fiber reinforced material (particle size 200 nm) were mixed at a mass ratio of 80:1, and mechanically stirred for 10 h.

[0043] Preparation of the metal-based cladding layer: the pretreated sintered NdFeB magnet and the prepared metal-based cladding material are placed in the plasma cladding equipment, and the metal-based cladding layer is prepared on the surface of the sintered NdFeB magnet. Th...

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Abstract

The invention discloses a preparation method of a sintered NdFeB magnet surface composite coating. The preparation method comprises the following steps of uniformly mixing metal-based alloy powder with a metal-based reinforcing material; preparing a metal-based cladding layer on the surface of sintered NdFeB obtained after pretreatment through a plasma cladding process; uniformly mixing ceramic-based powder with a ceramic-based reinforcing material; preparing a ceramic-based cladding layer on the metal-based cladding layer through the plasma cladding process; and conducting heat treatment on asintered NdFeB magnet obtained after coating. The composite coating prepared through the method is compact and free of pores and has the advantages of being high in binding force, corrosion resistance and wear resistance; and the more excellent corrosion protection effect can be provided for the sintered NdFeB magnet.

Description

technical field [0001] The invention belongs to the field of magnetic material protection, and in particular relates to a method for preparing a composite coating on the surface of a sintered NdFeB magnet. Background technique [0002] Sintered NdFeB magnets (NdFeB) are widely used in various fields of the national economy because of their excellent magnetic properties (magnetic energy product, coercivity and remanence). Since the sintered NdFeB magnet mainly includes the following three phases: the main phase Nd 2 Fe 14 B. Nd-rich phase and B-rich phase, and the potential difference between the phases is relatively large, so it is easily corroded in high temperature, humidity and electrochemical environments, which seriously limits the further expansion of the application field of sintered NdFeB magnets . In order to improve the corrosion resistance of sintered NdFeB magnets, the following two methods are usually used: adding alloy elements and surface protection treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/10C23C24/103
Inventor 曹玉杰郭开祥吴玉程黄秀莲刘家琴陈静武衣晓飞熊永飞
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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