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Orientation press method of neodymium-iron-boron magnet

A NdFeB, magnet technology, used in magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc.

Inactive Publication Date: 2015-12-30
廊坊京磁精密材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current production process of NdFeB magnets in the industry, the pass rate of the magnetic declination angle below 5° is usually only about 70%, and the pass rate of the magnetic declination angle below 3° is only about 30%.

Method used

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  • Orientation press method of neodymium-iron-boron magnet

Examples

Experimental program
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preparation example Construction

[0059] The present invention also provides a preparation method of an NdFeB magnet, comprising the following steps:

[0060] 1) Sintering the NdFeB magnet compact described in any one of the above technical solutions to obtain the NdFeB magnet blank;

[0061] 2) Slitting the NdFeB magnet blank obtained in the above steps to obtain the finished NdFeB magnet.

[0062] In the present invention, firstly, the NdFeB magnet compact described in any one of the above technical solutions is sintered to obtain a NdFeB magnet blank. In the present invention, firstly, the raw materials for preparing NdFeB magnets are sintered for the first time to obtain a primary sintered body; the present invention has no special limitation on the temperature of the sintering, and the temperature of sintered NdFeB magnets well known to those skilled in the art is i.e. Yes, the present invention is preferably 1000-1100°C, more preferably 1020-1050°C; the present invention has no special limitation on the...

Embodiment 1

[0071] Prepare a sintered NdFeB magnet A with a finished product size of 20mm×4mm×9mm

[0072] Micropowder preparation: the above-mentioned NdFeB raw material A is smelted, crushed and pulverized to obtain NdFeB raw material micropowder with a particle size of 4.0 μm.

[0073] Orientation pressing: uniformly mix the NdFeB fine powder and the lubricant methyl caprate according to the mass ratio of 1:0.0015, and after mixing for 90 minutes, a mixture of NdFeB fine powder is obtained;

[0074] Mold assembly: take two (orientation plate) large side plates 1 prepared by non-magnetic materials, and two small side plates (non-orientation plates) 2 prepared by non-magnetic materials, and the two small side plates are in the same position as the large The interface of the side plate combination is provided with a square-shaped clamping protrusion 3, the center line of the clamping protrusion coincides with the center line of the joint interface, and the height of the clamping protrusio...

Embodiment 2

[0082] Prepare a sintered NdFeB magnet B with a finished product size of 13mm×4mm×9mm

[0083] Micropowder preparation: the above-mentioned NdFeB raw material B was smelted, crushed and pulverized to obtain NdFeB raw material micropowder with a particle size of 4.0 μm.

[0084] Orientation pressing: uniformly mix NdFeB fine powder and lubricant n-hexane according to the mass ratio of 1:0.003, and after mixing for 100 minutes, a mixture of NdFeB fine powder is obtained;

[0085] Mold assembly: according to the method of Example 1, the height of the clamping protrusion is 7mm, and a mold with a molding height of 14mm and an overall size of 45mm×14mm×39.5mm is obtained.

[0086] Then add the NdFeB fine powder mixture into the mold, put it into a small press machine produced by Taiyuan Shengyuan with the model number YJ-195, and carry out orientation pressing under the conditions of a magnetic field strength of 2.0T and a pressure of 8MPa, and finally obtain NdFeB Magnet compacts...

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Abstract

The invention provides a mould for orientation press of a neodymium-iron-boron magnet. The mould comprises two oppositely arranged big side plates and two oppositely arranged small side plates; the two big side plates and the two small side plates together encircle a cylindrical inner cavity of the mould; the small side plates are provided with clamping bulges on a combined interface of the small side plates and the big side plates; the clamping bulges are arranged on a center line of the small side plates; the big side plates and the small side plates are connected by clamping. The invention also provides an orientation press method of the neodymium-iron-boron magnet. The method comprises the steps of firstly mixing neodymium-iron-boron micro powder and a lubricant to obtain a neodymium-iron-boron micro powder mixture; then placing the neodymium-iron-boron micro powder mixture into the mould to be subjected to orientation press to obtain a neodymium-iron-boron magnet pressed green compact. The neodymium-iron-boron magnet prepared by the orientation press method and a preparation method provided by the invention is relatively low in magnetic declination and relatively high in yield, so the product percent of pass is effectively improved, and the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of magnet preparation, and in particular relates to an orientation pressing method of an NdFeB magnet. Background technique [0002] A magnet is a substance that can generate a magnetic field and has the property of attracting ferromagnetic substances such as iron, nickel, cobalt and other metals. Magnets are generally divided into permanent magnets and soft magnets. Most of the materials used as magnetizers and electromagnets are soft magnets, and their polarity changes with the polarity of the applied magnetic field; permanent magnets are hard magnets, which can maintain their magnetic properties for a long time. , It is not easy to lose magnetization, and it is not easy to be magnetized. Therefore, whether in industrial production or in daily life, hard magnets are one of the most commonly used strong materials. [0003] Hard magnets can be divided into natural magnets and artificial magnets. Artificial...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057B22F3/02B22F3/03
Inventor 汤密军余远
Owner 廊坊京磁精密材料有限公司
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