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High-performance Ga containing cast sheet magnet and preparation method thereof

A casting and magnet technology, applied in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems that restrict the rapid development of the rubidium iron boron magnetic industry, prolong the sintering time, and the ingot is difficult to break. The effect of production cycle, saving manpower and material resources, and easy milling

Inactive Publication Date: 2015-10-28
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
[0004] In addition, the existing NdFeB magnets have poor corrosion resistance, and magnets with strong corrosion resistance have weak magnetic force, which seriously restricts the rapid development of NdFeB magnetic industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The components and weight percentages of the cerium-containing cast magnet are: Pr: 6.0-9.0%, Nd: 20.0-25.0%, B: 0.5-1.5%, Al: 0.05-0.3%, Cu: 0.10-0.2% , Zr: 0.1-0.2%, Ga: 0.15-0.25%, Co: 0.1-0.5%, and the balance is supplemented with Fe;

[0027] The preparation method for preparing the cast magnet containing cerium comprises the following steps:

[0028] 1) Smelting of cast slabs: Put the metal raw materials in proportion to the vacuum induction quick solidification casting furnace, vacuumize, melt at 600-800°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 rapidly cooled to form a cast sheet with a thickness of 0.25-0.35mm;

[0029] 2) Hydrogen crushing: put the cast piece obtained in step 1) into a hydrogen crushing furnace, and dehydrogenate at 400...

Embodiment 2

[0041] The composition and weight percentage of the cerium-containing cast magnet are:

[0042] Pr: 7.0-8.0%, Nd: 22.0-23.0%, B: 0.8-1.2%, Al: 0.08-0.1%, Cu: 0.15-0.2%, Zr: 0.18-0.2%, Ga: 0.18-0.22%, Co : 0.2~0.4%, the balance is supplemented with Fe;

[0043] The preparation method for preparing the cast magnet containing cerium comprises the following steps:

[0044] 1) Smelting of cast slabs: Put the metal raw materials in proportion to the vacuum induction quick solidification casting furnace, vacuumize, melt at 600-800°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 rapidly cooled to form a cast sheet with a thickness of 0.25-0.35mm;

[0045] 2) Hydrogen crushing: put the cast piece obtained in step 1) into a hydrogen crushing furnace, and dehydrogenate...

Embodiment 3

[0057] The composition and weight percentage of the cerium-containing cast magnet are:

[0058] Pr: 7.5%, Nd: 22.5%, B: 1.0%, Al: 0.1%, Cu: 0.18%, Zr: 0.2%, Ga: 0.20%, Co: 0.3%, and the balance is supplemented with Fe;

[0059] The preparation method for preparing the cast magnet containing cerium comprises the following steps:

[0060] 1) Smelting of cast slabs: Put the metal raw materials in proportion to the vacuum induction quick solidification casting furnace, vacuumize, melt at 600-800°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 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;

[0061] 2) Hydrogen crushing: put the cast piece obtained in step 1) into a hydrogen crushing furnace, and dehydrogenate at 400-500°C to obtain a...

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Abstract

The invention discloses a high-performance Ga containing cast sheet magnet and a preparation method thereof. The high-performance Ga containing cast sheet magnet comprises the following components by weight: 6.0-9.0 percent of Pr, 20.0-25.0 percent of Nd, 0.5-1.5 percent of B, 0.05-0.3 percent of Al, 0.10-0.2 percent of Cu, 0.1-0.2 percent of Zr, 0.15-0.25 percent of Ga, 0.1-0.5 percent of Co, and the balance of Fe. The preparation method comprises the following steps: cast sheet smelting, hydrogen decrepitation, jet milling grinding, magnetic field oriented moulding, isopressing and sintering. The high-performance Gd containing cast sheet magnet and the preparation method thereof have the advantages that on one hand, in the cast sheet smelting process, no alpha-Fe crystals exist in a cast sheet structure, and a cast sheet is broken more easily, so that the production period is shortened; on the other hand, Zr, Ga and Co metal elements are added, so that the corrosion resistance of the magnet are improved when the magnetism of the magnet is enhanced.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet materials, and in particular relates to a high-performance gallium-containing cast sheet magnet 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] The manufacturing process of sintered NdFeB permanent magnets commonly used now generally includes: raw material preparation→ingot smelting...

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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