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A compression molding process of bonded rare earth permanent magnet material

A rare earth permanent magnet and compression molding technology, which is applied in the manufacture of permanent magnets, inductors/transformers/magnets, electrical components, etc., can solve the problems of stability and reliability of bonded NdFeB rare earth permanent magnet products, etc. Achieve the effects of improving the stability and reliability of use, optimizing the overall product performance and improving corrosion resistance

Active Publication Date: 2020-05-15
圣航粉末冶金河北有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above problems have caused great troubles to the stability and reliability of bonded NdFeB rare earth permanent magnet products. The development of a better bonded NdFeB rare earth permanent magnet material and its compression molding preparation process will help improve the viscosity. The use stability and reliability of bonded NdFeB rare earth permanent magnet products are of great significance and broad application prospects. It is the direction of research and development personnel in the field of bonded NdFeB rare earth permanent magnet materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The bonded rare earth permanent magnet material in the present invention is prepared by the following preparation process:

[0032] 1) According to the mass percentage of Nd 30, B 0.98, Ga 0.4, Al 0.45, Cu 0.45, Co 0.15, the balance is Fe and unavoidable impurities, prepare NdFeB magnetic powder raw materials, the particle size of the magnetic powder is D50 is 50-90μm.

[0033] 2) Carrying out oxidation treatment on the magnetic powder raw material, specifically, first oxidation treatment for 1 hour in an atmosphere with an oxygen content of 10vol.% and a temperature of 150°C; Secondary oxidation treatment under atmospheric conditions for 0.5h.

[0034] 3) Mix the processed magnetic powder with a resin binder and a methyl ethyl ketone solvent and then carry out stirring and granulation in a V-type mixer, the mass ratio of the magnetic powder to the resin binder is 100:2.0, And the components of the resin binder are 1 part of dicyclopentadiene phenol type epoxy resin, ...

Embodiment 2

[0039] In Example 2, the coupling agent solution in step 6) is an isopropanol solution (isopropanol: Water = 4:1 mass ratio). All the other are identical with embodiment 1.

Embodiment 3

[0040] In Example 3, the coupling agent solution in step 6) is an isopropanol solution (isopropanol: Water = 4:1 mass ratio). All the other are identical with embodiment 1.

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PUM

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Abstract

The invention provides a compression molding process for a bonding rare earth permanent magnet material. The process comprises the following steps of 1) preparing neodymium iron boron magnetic powderraw material; 2) oxidizing the magnetic powder raw material; 3) mixing the treated magnetic powder with a resin binder for agitation granulation; 4) conducting warm compaction on the magnetic powder after granulation; 5) obtaining the bonding rare earth permanent magnet material after heat curing; 6) conducting coupling agent impregnation and heat treatment. According to the process, specific permanent magnet alloy powder with limited proportion of each element is adopted, through compressing molding processes such as the special coupling agent impregnation treatment, the warm compaction, secondary oxidation treatment, special binder resin composition process for granulation and the like, the obtained bonding rare earth permanent magnet material has excellent properties of high temperatureresistance, humidity resistance, corrosion resistance and oxidation resistance, and under using environments of high temperature, high humidity, severe corrosion and the like, the process ensures thereliability and stability of the use of rare earth permanent magnet products.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a compression molding process of a bonded rare earth permanent magnet material suitable for long-term use in a high-temperature corrosion environment. Background technique [0002] Rare earth permanent magnet materials are permanent magnet alloy materials with intermetallic compounds composed of different rare earth elements and transition group metal elements (Fe, Co, Ni, etc.) as the main phase. Since it was invented in the 1960s, rare earth permanent magnet materials have developed rapidly and have been widely used in many fields. They have become important basic functional materials for contemporary new technologies, especially in the field of permanent magnet motors. effect. Nowadays, rare earth permanent magnet motors have covered various main types such as stepping motors, brushless motors, servo motors and linear motors, and are widely used in computers, print...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02
CPCH01F41/0253H01F41/026H01F41/0266
Inventor 周慧媛
Owner 圣航粉末冶金河北有限公司