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NbFeB sintered rare earth permanent magnet alloy and method for producing the same

A rare-earth permanent magnet and NdFeB technology, which is applied in the direction of magnetic materials, magnetic objects, and inorganic materials, can solve the problems of magnet coercive force reduction, Nd-Fe-B magnet sintering process difficulties, and increased manufacturing costs. Achieve the effects of improving coercive force, easy sintering, and energy saving

Active Publication Date: 2009-07-01
BEIJING ZHONG KE SAN HUAN HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For Nd-Fe-B alloys containing Zr, Nb and other additive elements, due to thermodynamic reasons, the coercive force of the magnet after homogenization heat treatment is greatly reduced
And, with the increase of Zr, Nb and other elements, the sintering process of Nd-Fe-B magnet becomes difficult, which further increases the manufacturing cost

Method used

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  • NbFeB sintered rare earth permanent magnet alloy and method for producing the same
  • NbFeB sintered rare earth permanent magnet alloy and method for producing the same
  • NbFeB sintered rare earth permanent magnet alloy and method for producing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0021] By composition (Nd, Pr, Gd) 12 (Co, Cu, Al, Fe) 82.5 B 5.5 and (Nd, Pr, Gd) 16 (Co, Cu, Al, Fe) 77 B 7 Smelts two types of ingots. Neither Zr is added, the two alloys are crushed and mixed according to the atomic number ratio of 1:1, and then jet milled after hydrogen crushing. The fine powder obtained is oriented and formed under a magnetic field of 1.8-2T, and then 150 ~200MPa isostatic pressing, and finally vacuum sintering at 1090°C for 5 hours. After obtaining the magnet, it was tempered at 470°C for 5 hours. The Zr content in the final magnet obtained in this embodiment is 0.

[0022] As shown in Table 1, the performance of the Zr-free sintered Nd-Fe-B magnet prepared by the method of the present invention; as shown in Table 2, the sintering process of the present invention.

Embodiment 2

[0024] By composition (Nd, Pr, Gd) 12 (Co, Cu, Al, Fe) 82.5 B 5.5 and (Nd, Pr, Gd) 16 (Co, Cu, Al, Zr, Fe) 77 B 7 Smelts two types of ingots. One of them does not add Zr, and the other adds 0.2at.% Zr metal. The two alloys are crushed and mixed according to the atomic number ratio of 1:1. After hydrogen crushing, jet milling is carried out, and the fine powder obtained is at 1.8 It is oriented and shaped under ~2T magnetic field, and then isostatically pressed at 150~200MPa, and finally vacuum sintered at 1100°C for 5 hours. After obtaining the magnet, it was tempered at 500°C for 5 hours. The Zr content in the final magnet obtained in this embodiment is 0.1 at.%.

[0025] As shown in Table 1, the properties of sintered Nd-Fe-B magnets with different Zr contents prepared by the method of the present invention; as shown in Table 2, the sintering process of the present invention.

Embodiment 3

[0027] By composition (Nd, Pr, Gd) 13.5 (Co, Cu, Al, Fe) 80 B 6 and (Nd, Pr, Gd) 16 (Co, Cu, Al, Zr, Fe) 77 B 7 Smelts two types of ingots. One of them does not add Zr, and the other adds 1 at.% Zr metal. The two alloys are crushed and mixed according to the atomic number ratio of 4:1. After hydrogen crushing, jet milling is carried out, and the fine powder obtained is between 1.8 and Orientation and molding under a 2T magnetic field, followed by an external isostatic pressure of 150-200MPa, and finally vacuum sintering at 1100°C for 6 hours. Temper at 600°C for 5 hours after obtaining the magnet. The Zr content in the final magnet obtained in this embodiment is 0.2 at.%.

[0028] As shown in Table 1, the properties of sintered Nd-Fe-B magnets with different Zr contents prepared by the method of the present invention; as shown in Table 2, the sintering process of the present invention.

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Abstract

The invention relates to neodymium iron boron sintering rare-earth permanent-magnetic alloy and a method for preparing the alloy, the alloy comprises two types of alloy components, and the mixing rate of the atomicity of the two types of the alloy components is 1-9:9-1, wherein one type of the alloy components are not added with a TM2, the other type of the alloy components are added with the TM2, the atomic percent of the TM2 is 0at%<=TM2at%<=3at%, the two types of the alloy components are RE12-16(TM1, TM2, Fe)77-82.5B5.5-7, wherein the RE comprises Nd and one of Pt and Gd, the TM1 comprises Co, Cu and Al, and the TM2 is selected from one of Zr and Nb. Adopting the method, the coercivity is improved, the remanence of magnets is not reduced and is even improved, the sintering further becomes more easy, and energy is saved.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to a NdFeB sintered rare earth permanent magnet alloy added with zirconium and niobium and a preparation 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/12C22C33/02
Inventor 李正朱小矿钮萼王惠新韦立立姚宇良
Owner BEIJING ZHONG KE SAN HUAN HI TECH