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Sintered neodymium-iron-boron magnet of high cost performance and high corrosion resistance and preparation method thereof

A technology of high corrosion resistance and sintered magnets, applied in the fields of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as difficult control, easy segregation of copper liquid phase sintering, and difficulty in preparing high-performance magnets for mass production, etc. , to achieve the effect of reduced weight loss and high corrosion resistance

Inactive Publication Date: 2013-01-16
MIANYANG WESTMAG MAGNETISM & ELECTRICITY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because it is difficult to control the electroless copper plating process of magnetic powder, and copper is easy to segregate during liquid phase sintering, it is difficult to prepare high-performance magnets and mass-produce them.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Composition by design (PrNd) 29.55 Dy 2.2 Nb 0.3 Al 0.3 Ga 0.1 Cu 0.2 co 0.7 Ni 0.2 B 1.01 Fe 65.74 The raw materials are prepared and smelted in a 200kg flake furnace. The linear speed of the roller is 2-5m / s when the scales are poured, and finally the scales with a thickness of 0.25-0.35mm are obtained. Put these scales into a 500kg rotary hydrogen crushing furnace for hydrogen crushing, first absorb hydrogen under a hydrogen pressure of 70-90kPa for 1.5-3.5 hours, then vacuum dehydrogenate at about 530°C for 3-5 hours, reach about 5Pa, and cool for 8~ 12 hours. Add 0.1% antioxidant to the hydrogen crushed coarse powder, then in N 2 Enter the QLM300-5 jet mill under protection, the oxygen content of the jet mill is 100-150ppm, and obtain 3-3.5μm fine powder. Mix fine powder, gasoline and antioxidant uniformly in a mixer to get mixed powder. Among them, gasoline is No. 120 aviation gasoline, accounting for 2 to 3% of the total, and the molecular formula of ...

Embodiment 2

[0026] Composition by design (PrNd) 26.8 Dy 4.0 Nb 0.3 Al 0.2 Ga 0.1 Cu 0.15 co 1.2 B 1.01 Fe 66.24 Raw materials were prepared, and the unit price of the raw materials is listed in Table 2. The cost of the formula was 110.3 yuan / kg, and the sintered magnet was produced according to the process of Example 1. Measure the density and magnetic properties of the magnet produced by this method after machining, and do PCT (high pressure cooking test) detection. The PCT experimental conditions are the same as in Example 1, and the test results are listed in Table 3.

[0027] Table 2. Raw material unit price list

[0028] material name PrN B (19.51%) Fe Nb(63%)Fe Dy Al Cu co Fe Ga Material unit price

Embodiment 3

[0034] Composition by design (PrNd) 23.7 Dy 8.4 Nb 0.5 al 0.7 Cu 0.02 co 0.6 B 1.05 Fe 63.86 Raw materials were prepared, and a sintered magnet was obtained according to the process of Example 1. Measure the density and magnetic properties of the magnet produced by this method after machining, and do PCT (high pressure cooking test) detection. The PCT experimental conditions are the same as in Example 1, and the test results are listed in Table 4.

[0035] Table 4. Experimental data comparison

[0036]

[0037] Tradition

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Abstract

The invention relates a neodymium-iron-boron magnetpreparation method thereof, and belongs to the field of rare earth permanent magnet materials, in particular to the sintered neodymium-iron-boron magnethigh cost performance and high corrosion resistance, and the preparation method thereof. In the sintered neodymium-iron-boron magnethigh cost performance and the high corrosion resistance, the molecular formula of a neodymium-iron-boron magnet alloy material has the following general formula: (PrNd) aMbBcFe (100-a-b-c). The neodymium-iron-boron magnet is prepared by the steps of grinding, hydrogen blistering processing, grinding, mixing, molding and sintering. Through the preparation method, magnets having high the cost performance and the high corrosion resistance can be prepared; the technical process is easy to control; and the method is suitable for batch production.

Description

technical field [0001] The invention relates to a neodymium-iron-boron magnet and a preparation method thereof, belonging to the field of rare earth permanent magnet materials, in particular to a sintered neodymium-iron-boron magnet with high cost performance and high corrosion resistance and a preparation method thereof. Background technique [0002] Since its appearance in 1983, sintered NdFeB has been rapidly popularized and applied due to its excellent magnetic properties, and is widely used in computer, electronics, communication, office automation, automobile, machinery, medical and other industries. China's unique advantages in rare earth resources provide extremely favorable conditions for the development of sintered NdFeB magnets. At present, my country's production capacity and actual output of sintered NdFeB magnets are in the leading position in the world. With the rise of the world's wind power industry and my country's rich wind energy resources, it will surely...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/12
Inventor 陈浩
Owner MIANYANG WESTMAG MAGNETISM & ELECTRICITY CO LTD
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