Neodymium iron boron permanent magnet for motor and manufacturing method thereof

A manufacturing method and NdFeB technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, circuits, etc., can solve the problems of increasing material costs, soaring prices, and increasing manufacturers' costs, to enhance competitiveness, reduce cost, the effect of reducing production costs

Active Publication Date: 2009-04-15
SINOSTEEL ANHUI TIANYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prices of praseodymium, neodymium, dysprosium, and terbium have risen sharply with the increase of market demand, especially the prices of dysprosium and terbium are very expensive, which has led to an increase in the cost of NdFeB permanent magnet material manufacturers
The addition of these heavy rare earths not only increases the coercive force of the material, but also greatly increases the cost of the material, making it difficult to meet the customer's requirements economically.

Method used

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  • Neodymium iron boron permanent magnet for motor and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) Batching process: prepare 100kg / furnace

[0043] 2) Smelting process: use a medium frequency induction melting furnace with single-side cooling ingot mold, put 100kg of ingredients into the furnace in a certain order according to the melting point for melting, pay attention to the yield of steel ingots, and control the vacuum degree at 5×10 -2 Pa.

[0044] The smelting temperature is mainly to melt all the metals. Since the melting point of the added rare earth is not high, the maximum temperature depends on the temperature of the refractory alloy. Generally, it is pure iron and ferroniobium, and the temperature is 1600-1700 degrees Celsius.

[0045] Table 1 Composition and weight of NdFeB permanent magnets for motors (kg)

[0046]

[0047] 3) Milling process: The homogenized steel ingots are coarsely crushed, medium crushed, and air-jet milled to make NdFeB powder with a particle size of 3.6um-4.2um. During this process, the oxygen content should be controlled bel...

Embodiment 2

[0052] Example 2: 0.4% dysprosium oxide was added before the jet mill in the powder making process, the sintering temperature was 1090°C / 4h+920°C / 3h+560°C / 3.5h, and the others were the same as in Example 1. Specific properties of the produced N35SH material: Br=12.13KGs, Hcj=21.00Koe, (BH)m=35.60MGO, ρ≈7.550g / cm 3 .

Embodiment 3

[0053] Example 3: 0.2% dysprosium oxide was added before the jet mill in the powder making process, the sintering temperature was 1090°C / 4h+940°C / 2.5h+560°C / 4h, and the others were the same as in Example 1. Specific properties of the produced N33SH material: Br=11.81KGs, Hcj=20.20Koe, (BH)m=33.200MGO, ρ≈7.550g / cm 3 .

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Abstract

The invention discloses an NdFeB permanent magnet used for NdFe motors and a manufacture method thereof. The magnet comprises the following components by weight: 24-28 percent of PrNd, 0.5-7 percent of Gd, 1-5 percent of Ho, 0-6 percent of Dy, 0.9-1.1 percent of B, 0.1-0.15 percent of Cu, 0.2-1.2 percent of Al, 62.35-66.5 percent of Fe, 0.2-1.5 percent of Co and 0.2-0.8 percent of Nb. The magnet is manufactured through the procedures of mixing, melting, milling, forming, sintering and grinding processing. Through the use of cheap gadolinium and holmium instead of expensive praseodymium, neodymium, dysprosium and terbium for the production of high-performance NdFeB permanent magnet, the invention can greatly reduce production cost and the product has high magnetic property and strong market competitiveness.

Description

technical field [0001] The invention relates to an NdFeB permanent magnet material and a manufacturing method thereof, in particular to an NdFeB permanent magnet for a motor and a manufacturing method thereof. This product can be widely used in information industry, mechatronics, automobiles, motorcycles, metallurgical and mining equipment, fans, water pumps, oil field equipment, textile machinery, household appliances and other fields that use high-performance rare earth permanent magnet motors. Background technique [0002] NdFeB is currently the most magnetic permanent magnet material in the world. It is known as the "Magnetic King". NdFeB permanent magnet materials have been around for more than 20 years. With a series of advantages such as rich raw materials and cheaper prices than other rare earth permanent magnet materials, it has developed rapidly worldwide and is widely used in various fields such as electronics, communications, motors, automobiles, medical care, ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02B22F9/02B22F3/10
Inventor 裴晓东张开胜宋伟张瑜
Owner SINOSTEEL ANHUI TIANYUAN TECH
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