Novel sintered neodymium-iron-boron permanent-magnet material and manufacture method thereof

A rare earth permanent magnet, NdFeB technology, applied in the field of magnetic materials, can solve the problems of not clearly specifying the optimal composition range of Ho, not specifying Ho, not mentioning the role of Ho and reasonable composition range, etc.

Active Publication Date: 2009-11-18
SANVAC BEIJING MAGNETICS +1
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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 clearly point out the role of Ho and Ho as an essential component to increase Hcj and improve temperature resistance
For example, the Japanese patent No. 85109738 for the basic composition patent, to improve Hcj and temperature resistance, Dy and Tb are preferred, and the role of Ho and the reasonable composition range are not mentioned; the Japanese patent No. 99801229.7 for the he

Method used

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  • Novel sintered neodymium-iron-boron permanent-magnet material and manufacture method thereof
  • Novel sintered neodymium-iron-boron permanent-magnet material and manufacture method thereof
  • Novel sintered neodymium-iron-boron permanent-magnet material and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A kind of neodymium iron boron rare earth permanent magnet material containing Ho, according to the batching described in following table 1:

[0046] Table 1

[0047]

[0048] Then adopt following steps to prepare NdFeB rare earth permanent magnet material:

[0049] (1) Melting-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 40 mm;

[0050] (2) Pulverization: the ingot is pulverized into powder by the hydrogen crushing method, the average particle size is <1mm, and then, the powder is made into a fine powder by jet milling method, and the average particle size is 3-6 μm powder;

[0051] (3) Forming: the powder is pressed into a compact by molding;

[0052] (4) Sintering: sintering the compact in a vacuum sintering furnace at 1075°C for 4 hours;

[0053] (5) Tempering: Tempering the sintered compact in a vacuum sinter...

Embodiment 2

[0059] The smelting step adopts vacuum smelting, and the thickness of the alloy ingot is about 10mm; the ingot is crushed into powder by mechanical coarse crushing method, the average particle size is <1mm, and then, the fine powder is made by jet milling method, the average particle size is 3~ 6 μm powder; forming: molded and cooled isostatic pressing; sintering: the formed blank is sintered in a vacuum sintering furnace at 1085°C for 3 hours; finally tempered at 500°C for 2 hours, and the remaining steps are the same as in Example 1 , to obtain NdFeB rare earth permanent magnet materials. The results are shown in Table 3:

[0060] table 3

[0061]

[0062] By comparison, it can be found that the Hcj of the magnet of Example 2 with Ho added is 2.4 kOe higher than that of the existing magnet 2 without Ho added.

Embodiment 3

[0064] The smelting process adopts vacuum melting, and the alloy ingot with a thickness of about 25mm is used; the solution heat treatment process (1095°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, and then, The jet mill is used to grind powder into fine powder with an average particle size of 3-6 μm; forming: forming by molding; the temperature of the vacuum sintering furnace is 1085 ° C, the tempering temperature is 600 ° C, and the rest of the steps are the same as in Example 1 to obtain neodymium iron Boron rare earth permanent magnet material. 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 with Ho added is 3.6 kOe higher than that of the existing magnet 3 without Ho added.

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Abstract

The invention provides a novel sintered neodymium-iron-boron permanent-magnet material containing holmium and a manufacture method thereof. The novel sintered neodymium-iron-boron permanent-magnet material has the structural formula as follows: LnAlphaHoBetaBGammaMxNyFe100-Alpha-Beta-Gamma-x-y, wherein Ln is lanthanon comprising Nd and one or more selected from Pr, Dy and Tb; M is an additive element comprising Co and Cu; N is an additive element comprising one or more selected from Al, Ga, Nb, Zr and Ti; Alpha, Beta, Gamma, x and y are weight percentages of each element; Fe is an Fe element or unavoidable impurities; and Alpha is mare than or equal to 29 and less than or equal to 33, Beta is more than or equal to 0.5 and less than or equal to 4, Gamma is more than or equal to 0.95 and less than or equal to 1.20, x is more than or equal to 0 and less than or equal to 3.5, and y is more than or equal to 0 and less than or equal to 1.50. In the invention, the addition of Ho has a remarkable function in improving the Hcj of a magnet.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular, the invention relates to a sintered 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 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 aspec...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08B22F3/12
CPCC22C38/14H01F41/0253C22C38/06C22C38/005C22C38/12C22C38/10C22C38/16H01F1/0577
Inventor 赵玉刚胡伯平张瑾贾敬东孙立柏杨雁
Owner SANVAC BEIJING MAGNETICS
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