Method for preparing low-cost sintered neodymium (Nd) iron (Fe) boron (B) by doping lanthanum (La) cerium (Ce)

A low-cost NdFeB technology, applied in magnetic materials, electrical components, circuits, etc., can solve the problems of loss of performance, cost reduction, low-performance sintered NdFeB, etc., to achieve improved magnetic properties, low melting point, and fluidity Good results

Active Publication Date: 2012-12-26
SINOSTEEL ANHUI TIANYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, low-performance sintered NdFeB can be prepared by adding part of lanthanum-cerium alloy instead of praseodymium-neodymium alloy during the smelting process, but this method reduces cost on the basis of loss of performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Use the vacuum induction melting furnace to melt the NdFeB material (PrNdGd) 29.95 (FeCoAlCu) 68.98 B 1.07 Under the protection of argon, it is smelted at a temperature of 1480~1550℃, and the molten steel is cast onto a rotating cooling copper rod to prepare NdFeB alloy flakes with a thickness of 0.3~0.5mm;

[0025] 2) Use hydrogen to break the furnace, absorb hydrogen under 0.1MPa hydrogen pressure, dehydrogenate at 550°C, and crush it into 130μm NdFeB alloy powder;

[0026] 3) The above powder is further crushed into NdFeB powder with an average particle size of 4 μm through a jet mill;

[0027] 4) Add 5 μm lanthanum-cerium alloy powder to the powder described in 3), and use a three-dimensional mixer to mix the powder for 3 hours to ensure that the two powders are evenly mixed; wherein, the weight ratio of lanthanum-cerium alloy powder in the lanthanum-cerium alloy powder is 64.7: 35.3, the addition ratio of lanthanum-cerium alloy powder is 1.52% of the weight o...

Embodiment 2

[0031] 1) Use the vacuum induction melting furnace to melt the NdFeB material (PrNdGd) 29.95 (FeCoAlCu) 68.98 B 1.07 Under the protection of argon, it is smelted at a temperature of 1480~1550℃, and the molten steel is cast onto a rotating cooling copper rod to prepare NdFeB alloy flakes with a thickness of 0.3~0.5mm;

[0032] 2) Use hydrogen to break the furnace, absorb hydrogen under 0.1MPa hydrogen pressure, dehydrogenate at 550°C, and crush it into 130μm NdFeB alloy powder;

[0033] 3) The above powder is further crushed into NdFeB powder with an average particle size of 4 μm through a jet mill;

[0034] 4) Add 5 μm lanthanum-cerium alloy powder to the powder described in 3), and use a three-dimensional mixer to mix the powder for 3 hours to ensure that the two powders are evenly mixed. Wherein, the lanthanum-cerium weight ratio in the lanthanum-cerium alloy powder is 64.7: 35.3, and the addition ratio of the lanthanum-cerium alloy powder is 2% of the neodymium-iron-boro...

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Abstract

The invention discloses a method for preparing low-cost sintered neodymium (Nd) iron (Fe) boron (B) by doping lanthanum (La) cerium (Ce), and the method comprises following steps of (1) utilizing a quick-hardening sheet vacuum sensing smelting furnace to smelt a NdFeB material and to prepare a NdFeB alloy sheet with thickness of 0.3 to 0.5mm; (2) utilizing a hydrogen broken furnace to pulverize the NdFeB alloy sheet to NdFeB alloy powder of 110 to 150 micrometers; (3) grinding the obtained powder into NdFeB alloy powder of 3.5 to 4.5 micrometers through the airflow; (4) adding the LaGe alloy powder into the powder to be uniformly mixed; (5) utilizing a magnetic field press machine to orient and form the powder under the magnetic field, and acquiring pressed blank with density of 4.6 to 4.8 g/cm<3> through isostatic cool pressing; (6) placing the pressed blank into a vacuum sintering furnace to be sintered, and ensuring the sintered magnet of (PrNdGd)2936 to 29.65(LaCe)0.99 to 1.96(FeCoAlCu)67.63 to 68.3B1.05 to 10.6. The LaGe powder which is processed by special process is added to substitute rich neodymium phase in the NdFeB, so that the LaCe can be prevented from being excessively mixed with the NdFeB mani phase to influence the magnetic performance, and an effect for improving the product performance and reducing the product cost can be realized.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and relates to a preparation method of sintered NdFeB, in particular to a preparation method of low-cost sintered NdFeB using lanthanum and cerium. Background technique [0002] China's rare earth resources account for 80% of the world's known reserves, and 70% of China's rare earth resources are in Baotou. In Baotou rare earth, La:PrNd=35:25, and the content of Ce and Sm is also relatively high. The application field and application volume of NdFeB permanent magnet materials are increasing day by day, and the annual market demand is increasing by nearly 20%. Therefore, the price of NdPr alloy is getting higher and higher, and the supply is very tight. However, although lanthanum and cerium, which are rare earth metals, have large reserves, they are not very useful, so the price of lanthanum and cerium is much cheaper than that of praseodymium and neodymium. In the book "Sintered NdF...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/16B22F1/00
Inventor 周军张瑜孙红军宋伟刘军
Owner SINOSTEEL ANHUI TIANYUAN TECH
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