Neodymium iron boron magnet surface flame spray welding layer and preparation method thereof

A flame spray welding, NdFeB technology, used in the manufacture of permanent magnets, magnetic objects, inductors/transformers/magnets, etc. Abrasion and corrosion resistance, high hardness effect

Inactive Publication Date: 2019-11-12
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a flame spray welding layer on the surface of NdFeB magnets and a preparation method thereof, which will successfully form a flame spray welding layer on the surface of NdFeB magnets by using flame spray welding technology, thereby solving the problem of nickel-copper plating. The bonding force between the nickel alloy coating and the substrate is poor, and the corrosion resistance is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The concrete preparation steps of flame spray welding layer in the present embodiment are as follows:

[0037] S1. Magnet surface pretreatment:

[0038] A commercial block-shaped sintered NdFeB magnet (state: unmagnetized, brand: 38UH) with a size of 18×12×4mm was selected for the test. Process parameters of chamfering treatment: chamfering treatment in a rolling mill for 5 hours; then use 100-mesh brown corundum to perform sand blasting treatment on the chamfered magnet, the sand blasting angle is 45°, and the sand blasting time is 2 minutes; then use mass The magnet after sand blasting was pickled with dilute nitric acid with a fraction of 3% for 10s; finally, the magnet after pickling was ultrasonically washed and preheated at 200°C.

[0039] S2, preparation of spray welding powder:

[0040] Spray welding powder is nickel-based self-fluxing alloy powder mixed with nano-titanium carbide. Among them, the particle size of nanoparticles is 50nm; the particle size of n...

Embodiment 2

[0046] The concrete preparation steps of flame spray welding layer in the present embodiment are as follows:

[0047] S1. Magnet surface pretreatment:

[0048] A commercial block-shaped sintered NdFeB magnet (state: unmagnetized, brand: 38UH) with a size of 18×12×4mm was selected for the test. Process parameters of chamfering treatment: chamfering treatment in a rolling mill for 5 hours; then use 150-mesh brown corundum to perform sand blasting treatment on the chamfered magnet, the sand blasting angle is 60°, and the sand blasting time is 3 minutes; then use mass The magnet with a fraction of 4% is acid-washed for 15s after sand blasting; finally, the magnet after pickling is ultrasonically washed and preheated at 250°C.

[0049] S2, preparation of spray welding powder:

[0050] Spray welding powder is nickel-based self-fluxing alloy powder mixed with nano-tungsten carbide. Among them, the particle size of nanoparticles is 75nm; the particle size of nickel-based self-fluxi...

Embodiment 3

[0056] The concrete preparation steps of flame spray welding layer in the present embodiment are as follows:

[0057] S1. Magnet surface pretreatment:

[0058] A commercial block-shaped sintered NdFeB magnet (state: unmagnetized, brand: 38UH) with a size of 18×12×4mm was selected for the test. Process parameters of chamfering treatment: chamfering in a rolling mill for 5 hours; then use 200-mesh brown corundum to perform sand blasting on the chamfered magnet, the sand blasting angle is 75°, and the sand blasting time is 4 minutes; then use mass Dilute nitric acid with a fraction of 5% pickled the magnet after sand blasting for 20s; finally, after ultrasonic washing the magnet after pickling, preheated at 300°C.

[0059] S2, preparation of spray welding powder:

[0060] Spray welding powder is nickel-based self-fluxing alloy powder mixed with nano-silicon carbide. Among them, the particle size of nanoparticles is 100nm; the particle size of nickel-based self-fluxing alloy po...

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Abstract

The invention discloses a neodymium iron boron magnet surface flame spray welding layer and a preparation method thereof. The method comprises the step of neodymium iron boron magnet surface pretreatment in which the magnet is subjected to chamfering, sand blasting and pickling in sequence, and after cleaning, the magnet is preheated, the step of flame spray welding layer preparation in which theflame spray welding technology is adopted to perform spray welding of spray welding powder on the surface of the preheated magnet, and the step of heat treatment in which heat treatment is carried outon the magnet after spray welding and preparation of the neodymium iron boron magnet surface flame spray welding layer is completed. Through pretreatment optimization, the flame spray welding layer with good compactness, corrosion resistance and high bonding strength is successfully prepared on the surface of the sintered neodymium iron boron magnet, and the failure to apply the flame spray welding technology to sintering of the surface protection on the neodymium iron boron magnet in the prior art is remedied.

Description

technical field [0001] The invention belongs to the field of surface protection of permanent magnet materials, in particular to a flame spray welding layer on the surface of an NdFeB magnet and a preparation method thereof. Background technique [0002] Sintered NdFeB permanent magnets are known as the contemporary "magnet king" for their excellent magnetic properties, and are widely used in various fields such as motors, hardware appliances, medical machinery, aerospace, and national defense. Although sintered NdFeB magnets are the permanent magnet materials with the strongest comprehensive magnetic properties at this stage, their extremely poor corrosion resistance can cause a sharp attenuation or even loss of the magnetic properties of the magnets, which affects the performance and service life of sintered NdFeB magnets. , seriously restricting the further expansion of its application field. [0003] In view of the extremely poor corrosion resistance of sintered NdFeB ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/057H01F41/026
Inventor 曹玉杰刘友好查善顺黄秀莲吴玉程陈静武衣晓飞
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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