Multi-main phase Ho-containing NdFeB (neodymium iron boron) permanent magnet and manufacturing method thereof

A manufacturing method and permanent magnet technology, applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problems of affecting the particle size of powder making, easy oxidation of bottom material, affecting product yield and particle size distribution, etc. Achieve the effects of improving balanced utilization, improving corrosion resistance, and facilitating popularization and use

Active Publication Date: 2014-12-31
SHENYANG GENERAL MAGNETIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] U.S. Patent No. 7,258,751 authorized on August 21, 2007 and U.S. Patent No. 7,867,343 authorized on January 11, 2011 disclose heat treatment of quick-setting alloy sheets at 400-800°C for 5 minutes to 12 hours. Make the RH element move from the grain boundary phase to the main phase, thereby increasing the coercive force of the rare earth magnet; US Patent No. 7,585,378 authorized on October 8, 2009 discloses a method for manufacturing an alloy for R-T-Q series rare earth magnets. It consists in rapidly cooling the alloy melt to a range of 700-1000°C to form a quick-setting alloy, and then keeping the quick-setting alloy at a temperature of 700-900°C for 15-60

Method used

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  • Multi-main phase Ho-containing NdFeB (neodymium iron boron) permanent magnet and manufacturing method thereof
  • Multi-main phase Ho-containing NdFeB (neodymium iron boron) permanent magnet and manufacturing method thereof
  • Multi-main phase Ho-containing NdFeB (neodymium iron boron) permanent magnet and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Raw materials containing La, Ce, Pr, and Nd ingredients are batched according to the serial numbers 1-9, and then the raw materials are loaded into vacuum melting and quick-setting equipment to prepare vacuum quick-setting alloy flakes as the first alloy; the average grain size of the alloy flakes of the first alloy is The size is greater than 1.8 μm and less than 3.9 μm; then the raw materials containing Pr, Nd, Dy, and Ho are batched according to the serial numbers 1-9, and then the raw materials are loaded into the vacuum quick-setting alloy sheet prepared by the vacuum melting and quick-setting equipment as the second Alloy; the average grain size of the alloy flakes of the second alloy is greater than 1.5 μm and less than 3.3 μm; then the raw materials containing Pr, Nd, Dy, and Gd are batched according to the serial numbers 1-9, and then the raw materials are put into vacuum melting for quick solidification The vacuum quick-setting alloy sheet prepared by the equip...

Embodiment 2

[0033] Raw materials containing La, Ce, Pr, and Nd ingredients are batched according to the serial numbers 1-9, and then the raw materials are loaded into vacuum melting and quick-setting equipment to prepare vacuum quick-setting alloy flakes as the first alloy; the average grain size of the alloy flakes of the first alloy is The size is greater than 2.6 μm and less than 3.3 μm; then the raw materials containing Pr, Nd, Dy, and Ho are batched according to the serial numbers 1-9, and then the raw materials are loaded into the vacuum quick-setting alloy sheet prepared by the vacuum melting and quick-setting equipment as the second Alloy; the average grain size of the alloy flakes of the second alloy is greater than 1.6 μm and less than 3.0 μm; then the raw materials containing Pr, Nd, Dy, and Gd are batched according to the serial numbers of 1-9, and then the raw materials are put into vacuum melting for quick solidification The vacuum quick-setting alloy sheet prepared by the eq...

Embodiment 3

[0037] Raw materials containing La, Ce, Pr, and Nd ingredients are batched according to the serial numbers 1-9, and then the raw materials are loaded into vacuum melting and quick-setting equipment to prepare vacuum quick-setting alloy flakes as the first alloy; the average grain size of the alloy flakes of the first alloy is The size is greater than 1.8 μm and less than 3.0 μm; then the raw materials containing Pr, Nd, Dy, and Ho are batched according to the serial numbers 1-9, and then the raw materials are loaded into the vacuum quick-setting alloy sheet prepared by the vacuum melting and quick-setting equipment as the second alloy; the average grain size of the alloy flakes of the second alloy is greater than 1.5 μm and less than 2.9 μm; then the raw materials containing Pr, Nd, Dy, and Gd are batched according to the serial numbers 1-9, and then the raw materials are put into vacuum melting for quick solidification The vacuum quick-setting alloy flakes prepared by the equi...

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Abstract

The invention discloses a multi-main phase Ho-containing NdFeB (neodymium iron boron) permanent magnet and a manufacturing method thereof. The permanent magnet contains multiple main phases with different rare earth element contents. Oxide phases exist among the main phases. Oxygen contents of the oxide phases are higher than those of the main phases. The main phases with the high Ho content exist. Crystal grains composed of the main phases are isolated by grain boundaries. Average grain size is 6-14 um. The manufacturing method includes smelting a first alloy, smelting a second alloy, smelting a third alloy, performing hydrogen decrepitation, mixing the alloys, performing grinding powder, pressing under magnetic field, performing vacuum sintering, performing aging and the like. The method smelting the first alloy includes preparing the first alloy containing La element, Ce element, Pr element and Nd element. The method smelting the second alloy includes preparing the second alloy containing the element Pr, the element Nd, the element Dy and the element Ho. The method smelting the third alloy includes preparing the third alloy containing the element Pr, the element Nd, the element Dy and the element Gd.

Description

technical field [0001] The invention belongs to the field of permanent magnet devices, in particular to a Ho-containing multi-main phase NdFeB permanent magnet and a manufacturing method. Background technique [0002] Corrosion-resistant high-performance permanent magnet is a basic electronic component and electrical component widely used in the world today, mainly used in computers, mobile phones, televisions, automobiles, communications, toys, audio, automation equipment, nuclear magnetic resonance imaging, etc. With the requirements of energy saving and low-carbon economy, high-performance permanent magnets have begun to be applied in energy-saving household appliances, hybrid electric vehicles, wind power generation and other fields. [0003] U.S. Patent No. 7,258,751 authorized on August 21, 2007 and U.S. Patent No. 7,867,343 authorized on January 11, 2011 disclose heat treatment of quick-setting alloy sheets at 400-800°C for 5 minutes to 12 hours. Make the RH element ...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02B22F9/04
Inventor 孙宝玉洪光伟王健杨永泽段永利
Owner SHENYANG GENERAL MAGNETIC
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