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A making method of NdFeB magnetic powder

A technology of NdFeB and magnetic powder, which is applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problems of low magnetic energy product and achieve high magnetic energy product

Inactive Publication Date: 2007-10-17
俞葵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rapid quenching method is a main method for producing NdFeB magnetic powder at home and abroad at present, but its magnetic energy product is relatively low, which can only reach 7-9MGoe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Proportioning the above materials into an alloy weight composition of Nd: 20%, B: 1%, and the balance being iron, in a dual-purpose furnace for vacuum smelting and quick quenching, an amorphous Fe-Nd-B alloy is formed, and the amorphous The iron neodymium boron alloy is crystallized, and the crystallized alloy is pressed at 130°C with a pressure of 60Mpa for 30 minutes, and then sieved.

Embodiment 2

[0017] Proportioning the above materials so that the weight composition of the alloy is Nd: 25%, B: 5%, and the balance is iron, in the dual-purpose furnace for vacuum smelting and quick quenching, an amorphous Fe-Nd-B alloy is formed, and the amorphous The iron neodymium boron alloy is crystallized, and the crystallized alloy is pressed at 150°C with a pressure of 80Mpa for 40 minutes, and then sieved.

Embodiment 3

[0019] Proportioning the above materials so that the weight composition of the alloy is Nd: 25%, B: 7%, and the balance is iron, in the dual-purpose furnace for vacuum smelting and quick quenching, an amorphous Fe-Nd-B alloy is formed, and the amorphous The iron neodymium boron alloy is crystallized, and the crystallized alloy is pressed at 160°C with a pressure of 100Mpa for 50 minutes, and then sieved.

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PUM

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Abstract

The invention discloses an Nd-Fe-B magnetic powder preparing method comprising a vacuum fusion process, a vacuum quenching process, a crystallization process and a sieving process, a temperature pressure process is added between the crystallization process and the sieving process, the pressure process is persisting 30-60 minutes by a 60-150 MPa pressure under a condition of 130-180 DEG C. Compared with a current technic, the invention has a characteristic of a high magnetic energy product, the magnetic energy product can achieve 10-14 MGoe.

Description

Technical field: [0001] The invention belongs to the technical field of the preparation method of NdFeB magnetic powder, in particular to the technical field of the preparation method of amorphous NdFeB magnetic powder. Background technique: [0002] As the third-generation rare earth permanent magnet material, NdFeB has high magnetic energy level, strong coercive force and high cost performance, and is widely used in automotive electronics, electronic communications, aerospace, transportation energy, medical and health, computers, Household appliances and other fields. Rare earth permanent magnet NdFeB composite materials include sintered and bonded NdFeB materials. Although bonded NdFeB composite materials have been around for a short time, their products have the characteristics of good machinability, low operating temperature, and easy inlay with other materials, so they develop very rapidly. Bonded NdFeB composite materials are made of NdFeB Composite permanent magnet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02B22F3/02C22C1/04
Inventor 俞葵吴昌业
Owner 俞葵
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