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Novel rare-earth permanent magnetic alloy

A rare earth permanent magnet and alloy technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of deterioration, low Curie temperature, poor processing performance, etc., and achieve the effect of avoiding performance degradation

Active Publication Date: 2015-07-08
NINGBO SONGKE MAGNETIC MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing sintered NdFeB permanent magnet materials also have certain problems. Firstly, their Curie temperature is relatively low, usually less than 300°C, which greatly restricts its working temperature, thus to a large extent It restricts its wider application; moreover, it is a typical hard and brittle material with poor processing performance, which often leads to material damage and deterioration of magnetic properties due to the need to process the product into a specific shape

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4， and comparative example 1-9

[0030] 1) Double alloy preparation: Alloy 1 is composed of elements Nd, Fe, B, Al, Co, Nb, Zr, Cu, and alloy 2 is composed of elements Dy, Fe, B, Al, Co, Nb, Zr, Cu. Except for rare earth elements, the content of other elements is the same as that of the Nd-Fe-B series rare earth permanent magnet alloy (see Table 1 for details), so as to meet the conditions of the composition of the Nd-Fe-B series rare earth permanent magnet alloy Adjust the ratio of Alloy 1 and Alloy 2.

[0031] 2) Preparation of alloy one powder:

[0032] 1) Melting, put the prepared alloy-raw material into the vacuum induction melting furnace, evacuate the melting furnace to 18Pa and heat and melt until the temperature rises to 1050°C, start filling argon to a pressure of 0.2MPa, and then heat up Refining at 1200°C for 10 minutes, keeping it warm for 2 minutes;

[0033] 2) Casting, adopt the method of cast strip casting, the diameter of the cooling roll is 500mm, the cooling speed is controlled at 2.8m / s,...

Embodiment 5-8

[0058] In Examples 5-8, and Comparative Examples 10-15, the chemical composition of the alloy is the same as that of Example 3, and the advantages of double alloy preparation are mainly investigated, especially the influence of powder particle size on the properties of the alloy.

[0059] Table 2

[0060]

[0061]

[0062] From the results in Table 2, it can be seen that the powder particle size of alloy 1 and alloy 2 has an important influence on the performance of the alloy. If the powder particle size is too small, the activity of the powder will be too high and it will be difficult to adapt to the temperature of plasma discharge sintering. It leads to excessive grain growth and dissolution of the Nd-rich phase, and at the same time, the control of oxidation has become a problem that is not easy to solve. However, the particle size of the powder should not be too large. Too large powder will be difficult to effectively react to form the required organizational structu...

Embodiment 9-11

[0065] In Examples 9-11 and Comparative Examples 10-12, the chemical composition of the alloy is the same as that of Example 3, and the influence of plasma discharge sintering process conditions on the properties of the alloy was mainly investigated.

[0066] Table 2

[0067]

[0068] It can be seen that the sintering temperature and pressure should be at least 560°C and above 60MPa, otherwise it will be difficult to effectively sinter the reaction to obtain the desired texture and corresponding magnetic properties, but it should not be too high, otherwise it will lead to crystallization of the alloy system. The excessive growth of particles will significantly reduce the secondary performance, preferably at 580°C and 70MPa. The sintering time is at least 10 minutes, otherwise it is difficult to effectively complete the sintering reaction. In Comparative Example 13, a high-temperature tempering of 850°C×1h was added after sintering. However, the heat treatment of two temper...

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Abstract

The invention provides a novel Nd-Fe-B rare-earth permanent magnetic alloy. The Nd-Fe-B rare-earth permanent magnetic alloy is characterized by comprising the following components based on atom content: 15.0-18.0% of Nd, 5.0-6.0% of B, 0.2-0.3% of Al, 7.0-10.0% of Co, 0.5-0.8% of Nb, 0.1-0.3% of Zr, 0.2-0.4% of Cu, 3.0-5.0% of Dy, and the balance of Fe and unavoidable impurities. The alloy system is prepared by adopting an advanced dual-alloy mixed plasma discharge sintering method. The obtained sintered alloy system is of excellent comprehensive magnetic performance and high Curie temperature.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, and in particular provides a Nd-Fe-B series rare earth permanent magnet sintered material. Background technique [0002] As the most widely used functional material in modern industry and science and technology, permanent magnet materials mainly include alnico permanent magnet materials, ferrite permanent magnet materials, rare earth permanent magnet materials and other permanent magnet materials. Among them, rare earth permanent magnet materials are made of alloys formed by rare earth metals and transition metals through certain processes, and are currently the best type of permanent magnet materials with the best comprehensive performance. [0003] As a representative of rare earth permanent magnet materials, sintered NdFeB permanent magnet materials are made of neodymium (Nd), iron (Fe) and boron (B) as basic raw materials, and a small amount of other alloying ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C33/02B22F3/14H01F1/057
Inventor 易鹏鹏汪维杰卓开平汪志通包捷王燕玲卓金飞卓桂丽陈喜芬卓开岳李永敢
Owner NINGBO SONGKE MAGNETIC MATERIAL