Gadolinium-containing Nd-Fe-B rare earth permanent magnetic material dn its manufacturing method

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

Active Publication Date: 2007-11-14
BEIJING ZHONG KE SAN HUAN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although foreign NdFeB basic composition patents mention the addition of Gd, they do not point out th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1

[0041] A gadolinium-containing neodymium iron boron rare earth permanent magnet material is batched according to the following table 1:

[0042] Table 1

[0043] Existing magnet 1

[0044] Then adopt the following steps to prepare NdFeB rare earth permanent magnet material:

[0045] (1) smelting-casting: the raw material is formed into molten alloy liquid by vacuum melting method, and then the molten alloy liquid is cast and cooled into an alloy ingot with a book-shaped thickness of about 40 mm;

[0046] (2) pulverization: the ingot is pulverized into powder by the hydrogen crushing method, and the average particle size is less than 1 mm, and the powder is milled: the powder with an average particle size of 3 to 5 μm is made by the jet milling method;

[0047] (3) Forming: the powder is pressed into a compact by a molding method;

[0048] (4) Sintering: the compact is sintered in a vacuum sintering furnace at 1075°C for 4 hours;

[0049] (5) ...

Example Embodiment

[0055] Example 2

[0056] The smelting step adopts vacuum smelting; the thickness of the alloy ingot is about 10mm; the ingot is pulverized into powder by the mechanical coarse crushing method, and the average particle size is less than 1mm; Sintering is carried out at 1085° C. for 1 hour in a vacuum sintering furnace; finally, tempering is performed at 500° C. for 1 hour, and the remaining steps are the same as those in Example 1 to obtain a NdFeB rare earth permanent magnet material. The results are shown in Table 3.

[0057] table 3

[0058] Existing magnet 2

[0059] By comparison, it can be found that the Hcj of the magnet of Example 2 with Gd added is 1.03 kOe higher than that of the existing magnet 2 without Gd added.

Example Embodiment

[0060] Example 3

[0061] The smelting process adopts vacuum smelting, with an alloy ingot with a thickness of about 0.2mm; the solution heat treatment process (1095°C) is used between the casting and pulverization processes; the ingot is pulverized into powder by the hydrogen crushing method, and the average particle size is <1mm; molding : adopt rubber molding method to form; vacuum sintering furnace temperature is 1085 ℃, tempering temperature is 600 ℃, and other steps are the same as in Example 1, to obtain NdFeB rare earth permanent magnet material. The results are shown in Table 4.

[0062] Table 4

[0063] Existing magnet 3

[0064] By comparison, it can be found that the Hcj of the magnet of Example 3 with Gd added is 0.98 kOe higher than that of the existing magnet 3 without Gd added.

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Abstract

The present invention provides the Nd-Fe-B gadolinium-containing rare earth permanent magnet materials and manufacturing methods. Nd-Fe-B described in the gadolinium-containing rare earth permanent magnet material for the composition: Re alpha Gd beta B gamma MxNyFe100 - alpha-beta - gamma - xy, including: Re for REE, including from Nd, Pr, Dy, Tb and in at least one Ce elemental or more elements; M to add elements, including Co and Cu; N to add elements, including from Al, Ga, Nb, Zr, Ti and Sn one or more elements; alpha, beta, gamma , x, y percentage of weight for each element content; Fe Fe and unavoidable impurities of which, 29 =< alpha =< 35,0.05 =< beta =< 0.50,0.95 =< gamma =< 1.20,0 =< x =< 10,0 =< y =< 1.50. Manufacturing methods described by melting, casting, grinding, molding and sintering of a continuous process manufacturing sintered magnets. The Nd-Fe-B Gd rare earth permanent magnet material added after its Hcj has improved, and to improve its temperature .

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 gadolinium and a manufacturing method thereof. Background technique [0002] Rare earth NdFeB permanent magnet material is the third generation permanent magnet material developed in the early 1980s. It is commonly known as the "Permanent Magnet King" because of its extremely strong magnetism. 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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IPC IPC(8): H01F1/057H01F1/08
Inventor 赵玉刚张瑾侯德柱成问好胡伯平
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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