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Holmium-contained Nd-Fe-B rare earth permanent magnetic material and manufacturing method thereof

A rare earth permanent magnet and neodymium iron boron technology, applied in the field of magnetic materials, can solve problems such as unspecified Ho, and achieve the effect of reducing costs

Inactive Publication Date: 2009-04-08
ZHEJIANG SHENGHUA MAGNETIC MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although foreign NdFeB basic composition patents mentioned the addition of Ho, they did not point out the role of Ho and Ho as a necessary component to increase Hcj and reduce production costs.

Method used

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  • Holmium-contained Nd-Fe-B rare earth permanent magnetic material and manufacturing method thereof
  • Holmium-contained Nd-Fe-B rare earth permanent magnetic material and manufacturing method thereof
  • Holmium-contained Nd-Fe-B rare earth permanent magnetic material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]A kind of neodymium iron boron rare earth permanent magnet material containing holmium, according to the batching described in following table 1:

[0045] Table 1

[0046]

[0047] Then adopt following steps to prepare NdFeB rare earth permanent magnet material:

[0048] (1) Smelting-casting: the raw materials are formed into molten alloy liquid by vacuum melting method, and then the molten alloy liquid is cast and cooled into a book-shaped alloy ingot with a thickness of about 20 mm;

[0049] (2) Pulverization: the ingot is pulverized into powder by the hydrogen crushing method, the average particle size is <1 mm, and pulverization: the powder with the average particle size of 3-5 μm is made by the jet mill method;

[0050] (3) Forming: the powder is pressed into a compact by molding;

[0051] (4) Sintering: sintering the compact in a vacuum sintering furnace at 1080°C for 4 hours;

[0052] (5) Tempering: Tempering the sintered compact in a vacuum sintering furnac...

Embodiment 2

[0059] The smelting step adopts vacuum smelting; the thickness of the alloy ingot is about 10mm; the ingot is crushed into powder by the mechanical coarse crushing method, and the average particle size is <1mm; forming: forming by molding and cooling isostatic pressing; sintering: the blank after forming Carry out sintering at 1085° C. for 1 hour in a vacuum sintering furnace; finally temper at 500° C. for 1 hour, and the rest of the steps are the same as in Example 1 to obtain NdFeB rare earth permanent magnet materials. See Table 3 for the results.

[0060] table 3

[0061]

[0062] By comparison, it can be found that the Hcj of the magnet of Example 2 added with Ho is 1.03 kOe higher than that of the existing magnet 2 without Gd added.

Embodiment 3

[0064] The smelting process adopts vacuum smelting, and the alloy ingot with a thickness of about 0.3mm is used; the solution heat treatment process (1090°C) is used between the casting and crushing processes; the ingot is crushed into powder by hydrogen crushing method, and the average particle size is <1mm; forming : Formed by rubber molding method; vacuum sintering furnace temperature is 1085°C, tempering temperature is 480°C, and the remaining steps are the same as implementation 1 to obtain NdFeB rare earth permanent magnet materials. The results are shown in Table 4.

[0065] Table 4

[0066]

[0067] By comparison, it can be found that the Hcj of the magnet of Example 3 added with Gd is 0.983 kOe higher than that of the existing magnet 3 without Ho added.

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Abstract

The invention provides an Nd-Fe-B rare earth permanent magnet material containing Ho and a preparation method thereof; the composition of the Nd-Fe-B rare earth permanent magnet material containing Ho comprises Re Alpha Ho Beta B Gama MxNyFe 1-Alpha-Beta-Gama-x-y; wherein, Re is rare earth element and comprises Nd or Nd as well as one or more elements out of La, Ce, Pr, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y and Sc; M is addition element and comprises Co and Cu; N is addition element and comprises one or more elements out of Al, Ga, Nb, Zr, Ti and Sn; Alpha, Beta, Gama, x and y are respectively weight percentage of all elements; Fe is iron and unavoidable impurities; wherein, Alpha is not more than 35% and not less than 29%; Beta is not less than 0.05% and not more than 0.5%; Gama is not more than 1.20% and not less than 0.95%; x is not more than 10% and is not less than 0; y is not more than 1.50% and not less than 0. The preparation method adopts the continuous procedures such as smelting, casting, crushing, forming and sintering to prepare a magnet. The Hcj of the Nd-Fe-B rare earth permanent magnet material is improved and the production cost thereof is reduced after Ho is added in the Nd-Fe-B rare earth permanent magnet material.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular, the invention relates to a NdFeB rare earth permanent magnet material added with holmium and a manufacturing method thereof. Background technique [0002] Rare earth NdFeB permanent magnet material is the third generation of permanent magnet material developed in the early 1980s. Because of its extremely strong magnetism, it is commonly known as the "permanent magnet king". It can pick up objects equivalent to 1000 times its own weight, and has excellent magnetic characteristics and energy-saving, material-saving, and environmental protection effects. It is a high-performance material that other permanent magnet materials cannot match. As an important functional material, rare earth permanent magnet materials have been widely used in the fields of energy, transportation, machinery, medical treatment, computers, and home appliances, and have penetrated into all aspects of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057C22C1/00
Inventor 王胜华魏方允
Owner ZHEJIANG SHENGHUA MAGNETIC MATERIALS
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