A kind of high coercive force sintered NdFeB magnet and its preparation method

A high coercive force, neodymium iron boron technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of increased strength requirements, inability to meet high strength, high corrosion, etc., to achieve improved Coercive force, the effect of improving the coercive force of magnets and improving wettability

Active Publication Date: 2018-08-17
宁波元辰新材料有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] NdFeB permanent magnet is a kind of NdFeB magnetic material, also known as the latest result of the development of rare earth permanent magnet materials. It is called "Magnetic King" because of its excellent magnetic properties. Wit

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1

[0026] A method for preparing a high-coercivity sintered NdFeB magnet, which comprises the steps:

[0027] (1) Silane coupling agent Si-69 and nano silica were mixed in ethanol solution at a ratio of 1:5 for 60 minutes, and the heating temperature was 60°C to obtain modified nano silica;

[0028] (2) A 10kg vacuum induction furnace is used to smelt NdFeB alloy, and at the same time, Mg and Al metals (accounting for 1% of NdFeB alloy) are respectively smelted, then the ingot is crushed, and the broken NdFeB alloy is immersed in the modified Dry in the nano-silica solution after 24h. Then, under the protection of argon gas, the melt overflow method is used to prepare fast quenched ribbon samples;

[0029] (3) Add crushed Mg and Al to the neodymium-iron-boron alloy sample under the protection of argon gas, mix them evenly, and produce magnetic powder with an average particle size of 3~5μm through hydrogen cracking and airflow milling;

[0030] (4) The magnetic powder s...

Example Embodiment

[0032] Example 2

[0033] A method for preparing a high-coercivity sintered NdFeB magnet, which comprises the steps:

[0034] (1) Silane coupling agent Si-69 and nano silica were mixed in ethanol solution at a ratio of 1:10 for 60 minutes, and the heating temperature was 60°C to obtain modified nano silica;

[0035] (2) A 10kg vacuum induction furnace is used to smelt NdFeB alloy, and at the same time, Mg and Al metals (accounting for 1% of NdFeB alloy) are respectively smelted, then the ingot is crushed, and the broken NdFeB alloy is immersed in the modified Dry in the nano-silica solution after 24h. Then, under the protection of argon gas, the melt overflow method is used to prepare fast quenched ribbon samples;

[0036] (3) Add crushed Mg and Al to the neodymium-iron-boron alloy sample under the protection of argon gas, mix them evenly, and produce magnetic powder with an average particle size of 3~5μm through hydrogen cracking and airflow milling;

[0037] (4) The magnetic powder ...

Example Embodiment

[0039] Example 3

[0040] A method for preparing a high-coercivity sintered NdFeB magnet, which comprises the steps:

[0041] (1) Silane coupling agent Si-69 and nano silica were mixed in ethanol solution at a ratio of 1:20 for 60 minutes, and the heating temperature was 60°C to obtain modified nano silica;

[0042] (2) A 10kg vacuum induction furnace is used to smelt NdFeB alloy, while Mg and Al metals (accounting for 0.1% of the NdFeB alloy) are respectively smelted, and then the ingot is broken, and the broken NdFeB alloy is immersed in the modified Dry in the nano-silica solution after 24h. Then, under the protection of argon gas, the melt overflow method is used to prepare fast quenched ribbon samples;

[0043] (3) Add crushed Mg and Al to the neodymium-iron-boron alloy sample under the protection of argon gas, mix them evenly, and produce magnetic powder with an average particle size of 3~5μm through hydrogen cracking and airflow milling;

[0044] (4) The magnetic powder sample ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Average particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention provides a high-coercivity sintered neodymium-iron-boron magnet and a preparation method thereof. The magnet comprises following raw materials: neodymium-iron-boron alloy, magnesium, aluminum, silane coupling agent and nanosilicon dioxide. The magnesium and aluminum make up 1% of the neodymium-iron-boron alloy; the mass ratio of silane coupling agent and nanosilicon dioxide is 1:5 to 20; by means of the dynamic crystallization manufacture technology, samples can be heated quickly to the phase transition point and insulated for short time and cooled quickly; under the premise that the samples are uniformly heated, the crystal grains are finer and the coercive force of magnet is increased.

Description

technical field [0001] The invention relates to the field of permanent magnet materials, in particular to a sintered NdFeB magnet with high coercive force and a preparation method thereof. Background technique [0002] As the third-generation permanent magnet material, NdFeB has been widely used in microwave technology, audio-visual technology, electrical engineering, instrument technology, computer technology, magnetic separation technology, automobile industry and other fields due to its excellent magnetic properties and low price. With the thawing of sintered NdFeB patented technologies in Japan, Germany, and the European Union, and the concerted efforts of major sintering manufacturers in my country, the grade of sintered NdFeB products has also been greatly improved. At the same time, with the further promotion of NdFeB as a high-tech application field, the comprehensive performance requirements of its products are also continuously increasing, especially its strength r...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0573H01F1/0576H01F41/0266
Inventor 贝振军
Owner 宁波元辰新材料有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap