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High-performance cerium-neodymium-praseodymium cast sheet magnet and preparation method thereof

A casting and magnet technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of ingots that are difficult to break, prolong the sintering time, etc., achieve easy powder making, save manpower and material resources, and suppress α -Effect of Fe crystals

Inactive Publication Date: 2015-11-18
宁德市星宇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the thickness of the ingots prepared by the ingot smelting process is mostly about 20mm, and α-Fe dendrites are prone to precipitate out. Due to the good plasticity of the α-Fe dendrites, the ingots are difficult to break, which brings great difficulties to the subsequent pulverization process. A lot of inconvenience, it is necessary to prolong the sintering time to obtain uniform Nd2Fe14B crystals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition and weight percentage of the cast magnet containing neodymium, cerium and praseodymium are: Pr: 4.0-5.0%, Nd: 17.0-19.0%, Ce: 6.5-7.5%, Gd: 0.8-1.2%, Ho: 0.9- 1.3%, B: 0.95~1.05%, Al: 0.5~1.0%, Cu: 0.15~0.2%, Co: 0.20~0.40%, the balance is supplemented with Fe;

[0026] The preparation method for preparing the cast magnet containing neodymium cerium praseodymium comprises the following steps:

[0027] 1) Smelting of cast slabs: Put the metal raw materials in proportion to the vacuum induction quick solidification casting furnace, vacuumize, melt at 800-1000°C, heat until the metal Pr starts to melt, fill in high-purity argon, and the metal After the raw materials are melted, they are ultrasonically mixed, and when the surface of the molten alloy is conjunctivated, it is poured onto a rotating water-cooled copper rod, and cooled rapidly to form a cast sheet with a thickness of 0.25-0.35mm;

[0028] 2) Hydrogen crushing: put the cast piece obtained in ste...

Embodiment 2

[0040] The composition and weight percentage of the cast magnet containing neodymium, cerium and praseodymium are:

[0041] Pr: 4.5%, Nd: 18%, Ce: 7%, Gd: 1.0%, Ho: 1.1%, B: 1.0%, Al: 0.8%, Cu: 0.18%, Co: 0.3%, the balance is supplemented with Fe ;

[0042] The preparation method for preparing the cast magnet containing neodymium cerium praseodymium comprises the following steps:

[0043] 1) Smelting of cast slabs: Put the metal raw materials in proportion to the vacuum induction quick solidification casting furnace, vacuumize, melt at 800-1000°C, heat until the metal Pr starts to melt, fill in high-purity argon, and the metal After the raw materials are melted, they are ultrasonically mixed, and when the surface of the molten alloy is conjunctivated, it is poured onto a rotating water-cooled copper rod, and cooled rapidly to form a cast sheet with a thickness of 0.25-0.35mm;

[0044] 2) Hydrogen crushing: put the cast piece obtained in step 1) into a hydrogen crushing furna...

Embodiment 3

[0056] The composition and weight percentage of the cast magnet containing neodymium, cerium and praseodymium are:

[0057] Pr: 4.0%, Nd: 17.0%, Ce: 7.5%, Gd: 1.2%, Ho: 0.9%, B: 1.05%, Al: 0.5%, Cu: 0.15%, Co: 0.40%, the balance is supplemented with Fe ;

[0058] The preparation method for preparing the cast magnet containing neodymium cerium praseodymium comprises the following steps:

[0059] 1) Cast smelting: Put the metal raw materials in proportion to the vacuum induction quick solidification casting furnace, vacuumize, melt at 850-1050°C, heat until the metal Pr starts to melt, fill it with high-purity argon, and the metal After the raw materials are melted, they are mixed by electromagnetic stirring. When the surface of the molten alloy is conjunctivated, it is poured onto a rotating water-cooled copper rod, and cooled rapidly to form a cast sheet with a thickness of 0.25-0.35mm;

[0060] 2) Hydrogen crushing: put the cast piece obtained in step 1) into a hydrogen cru...

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Abstract

The invention discloses a high-performance cerium-neodymium-praseodymium cast sheet magnet and a preparation method thereof. The cast sheet magnet comprises, by weight, 4.0-5.0% of Pr, 17.0-19.0% of Nd, 6.5-7.5% of Ce, 0.8-1.2% of Gd, 0.9-1.3% of Ho, 0.95-1.05% of B, 0.5-1.0% of Al, 0.15-0.2% of Cu, 0.20-0.40% of Co and the balance Fe for supplement. The preparation method comprises the steps of cast sheet smelting, hydrogen decrepitation, air-current mill smashing, magnetic field orientation forming, isostatic pressing and sintering. According to the high-performance cerium-neodymium-praseodymium cast sheet magnet and the preparation method thereof, on one hand, the neodymium using amount is reduced, but it still can be guaranteed that the magnet has the excellent magnetism, and the neodymium resources are protected; on the other hand, no alpha-Fe crystal exists in cast sheet tissue due to the cast sheet smelting technology, cast sheets are broken more easily, and the production cycle is shortened.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet materials, and in particular relates to a high-performance cast piece magnet containing neodymium, cerium and praseodymium and a preparation method thereof. Background technique [0002] NdFeB rare earth permanent magnet material is the most powerful permanent magnet material ever discovered, and has been used more and more for its excellent magnetic properties. It is widely used in medical nuclear magnetic resonance imaging, computer hard disk drives, Acoustics, mobile phones, etc.; with the requirements of energy saving and low-carbon economy, NdFeB rare earth permanent magnet materials have begun to be used in auto parts, household appliances, energy-saving and control motors, hybrid vehicles, wind power, aerospace and other fields. leading to its increasing usage. [0003] At present, my country's NdFeB output accounts for more than 60% of the world's total. It is expected that its a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/16
Inventor 吕竹风金玉坤刘龙吴春光皱高程
Owner 宁德市星宇科技有限公司
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