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Method for making high-square-degree sintered NdFeB permanent magnets with cerium, titanium, cobalt and zirconium compound additive

A technology of composite addition and NdFeB, applied in the manufacture of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of high cost and difficulty, and achieve high density, reduced consumption, and good structural consistency Effect

Inactive Publication Date: 2015-08-05
安徽万磁电子股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The reserve of Ce element in nature is far more than that of Nd element. Nd and Ce elements mostly exist in the form of paragenetic ore, and the cost of industrial separation and purification is high and difficult.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The nominal mass percentages of the NdFeB magnets in this example are Nd 25.5%, Ce 4.0%, Fe 65.55%, B 1%, Nb 0.75%, Co 2%, Zr 0.1%, Al 0.7%, Cu 0.1%, Ti 0.3 %. Vacuum smelting is carried out at a temperature of 1380°C by using a vacuum induction quick-solidification casting furnace. Before smelting, the furnace chamber is evacuated first, and then filled with high-purity argon as a protective gas. The alloy liquid after the raw materials are melted is evenly stirred by electromagnetic, and poured onto the rotating water-cooled copper rod. 2 -10 4 Rapid cooling at a cooling rate of °C / s forms alloy flakes with a thickness of 0.2-0.5mm. Using a hydrogen crushing furnace, absorb hydrogen under a hydrogen pressure of 0.1MPa, dehydrogenate at a temperature of 550°C, and crush the NdFeB alloy flakes into NdFeB alloy particles of about 120-200μm. The hydrogen crushed particles are further crushed into 3.0-4.5 μm neodymium iron boron alloy powder through a jet mill. Using ...

Embodiment 2

[0022] The nominal mass percentages of the NdFeB magnets in this example are Nd 27%, Ce 2.5%, Fe 65.55%, B1%, Nb 0.75%, Co 2%, Zr 0.1%, Al 0.7%, Cu 0.1%, Ti 0.3% . Vacuum smelting is carried out at a temperature of 1380°C by using a vacuum induction quick-solidification casting furnace. Before smelting, the furnace chamber is evacuated first, and then filled with high-purity argon as a protective gas. The alloy liquid after the raw materials are melted is evenly stirred by electromagnetic, and poured onto the rotating water-cooled copper rod. 2 -10 4 Rapid cooling at a cooling rate of °C / s forms alloy flakes with a thickness of 0.2-0.5 mm. Using a hydrogen crushing furnace, absorb hydrogen under a hydrogen pressure of 0.1MPa, dehydrogenate at a temperature of 550°C, and crush the NdFeB alloy flakes into NdFeB alloy particles of about 120-200μm. The hydrogen crushed particles are further crushed into 3.0-4.5 μm neodymium iron boron alloy powder through a jet mill. Using a ...

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Abstract

The invention discloses a method for making high-square-degree sintered NdFeB permanent magnets with a cerium, titanium, cobalt and zirconium compound additive. The method comprises the steps that raw materials are prepared with 27.0% to 29.0% of Nd, 2.5% to 4.0% of Ce, 63.5% to 67.5% of Fe, 1.0% to 1.2% of B, 0.5% to 1.0% of Nb, 1.0% to 3.0% of Co, 0.1% to 0.3% of Zr, 10.5% to 1.0% of A, 0.1% to 0.3% of Cu, and 0.1% to 0.3% of Ti, the raw materials are smelted under the temperature of 1380 DEG with a vacuum induction rapid-hardening casting strip furnace, smelted alloy liquid is processed through electromagnetic stirring to be uniform, and is poured to a rotating water-cooling copper stick, and the alloy liquid is rapidly cooled to form alloy slices with the thickness ranging from 0.2 mm to 0.5 mm; NdFeB alloy slices are broken into NdFeB alloy particles with the length ranging from 120 microns to 200 microns with a hydrogen breaking furnace; the particles are further broken into NdFeB alloy powder with the length ranging from 3.0 microns to 4.5 microns by an air-current mill; the powder is formed in a forming press, and is further densified through isostatic cool pressing; formed initial blanks are sintered, and sintered permanent magnets are finally obtained. With the method for making high-square-degree sintered NdFeB permanent magnets with the cerium, titanium, cobalt and zirconium compound additive, the squre degree of the permanent magnets can be improved, and the production cost can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a method for preparing high squareness sintered NdFeB permanent magnets by composite addition of cerium, titanium, cobalt and zirconium. Background technique [0002] The NdFeB series permanent magnet material is the practical permanent magnet material with the highest magnetic performance found so far. At present, my country's NdFeB production accounts for more than 60% of the world's total. It is expected that its application scope and market demand will continue to expand in the future. The NdFeB industry has a large demand for rare earth element Nd, and it will increase at a rate of about 20% every year. It is imminent to seek alternative metals for Nd or to explore a new generation of permanent magnets. [0003] The reserve of Ce element in nature is far more than that of Nd element. Nd and Ce elements mostly exist in the form of paragenetic ore, and the cost of i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057B22F3/16
Inventor 张亚波何进史世文
Owner 安徽万磁电子股份有限公司
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