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Method for alloying Ga element through neodymium-iron-boron permanent magnet material

A permanent magnet material, NdFeB technology, applied in the field of alloying Ga element of NdFeB permanent magnet material, can solve the problems of large burning loss of Ga element, troublesome operation, low utilization rate, etc., to improve utilization rate, reduce The effect of volatilization and reduction of burning loss

Inactive Publication Date: 2015-05-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the low melting point of metal Ga (about 30°C), it is easy to be liquid under normal conditions. When alloying Ga elements in NdFeB materials, metal Ga is usually sealed in Fe blocks or Nd blocks during batching, that is Drill holes in the Fe block or Nd block and inject Ga, which is not only troublesome to operate, but also Ga is easy to volatilize, resulting in large burning loss of Ga element and low utilization rate

Method used

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  • Method for alloying Ga element through neodymium-iron-boron permanent magnet material
  • Method for alloying Ga element through neodymium-iron-boron permanent magnet material

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Embodiment 1

[0021] According to the composition of Nd29.8Fe68.41Ga0.8B0.99 (weight percent), the alloying element Ga is added in the form of Fe-Ga alloy, that is, 29.8kg of metal Nd, 5.5kg of B-Fe alloy (containing 18wt% B), 4kg of Fe-Ga alloy (containing 20wt% Ga), 60.7kg of commercially pure Fe are batched together, and 3% (percentage by weight) of rare earth Nd is considered in addition, and all raw materials are prepared through the scale ingot process to prepare neodymium with a thickness of about 300 μm Iron-boron-based quick-setting flakes were prepared by hydrogen breaking and jet milling to prepare 2:14:1 NdFeB-based powders with an average particle size of 3.5 μm. The powders were oriented and pressed in a 1.8T magnetic field and pressed isostatically. The obtained The compact is placed in a vacuum sintering furnace, vacuum sintered at 1080°C for 3 hours, and then subjected to secondary tempering (primary tempering: 920°C / 3h, secondary tempering: 500°C / 2h), and finally sintered N...

Embodiment 2

[0027] According to the composition of Nd29Dy1.5Fe68.01Ga0.5B0.99 (weight percent), the alloying element Ga is added in the form of Fe-Ga alloy, that is, the B-Fe alloy of 29kg of metal Nd, 1.5kg of metal Dy, and 5.5kg of B-Fe alloy (containing 18wt% B), 2kg of Fe-Ga alloy (containing 25wt% Ga), and 62kg of industrial pure Fe are batched together, and 3% (percentage by weight) of rare earth Nd is considered in addition, and all raw materials are prepared through a scale ingot process with a thickness of about The 300μm NdFeB-based quick-setting flakes are prepared by hydrogen breaking and jet milling to prepare 2:14:1 NdFeB-based powders with an average particle size of 3.5μm. The powder is oriented and pressed in a 1.8T magnetic field and isostatically pressed , put the obtained compact into a vacuum sintering furnace, sinter in vacuum at 1080°C for 3h, and then perform secondary tempering (primary tempering: 920°C / 3h, secondary tempering: 500°C / 2h), and finally get sintered ...

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Abstract

The invention relates to a method for alloying a Ga element through a neodymium-iron-boron permanent magnet material, and belongs to the field of rear earth permanent magnet materials. The method can be used for smelting an alloy by utilizing a Fe-Ga alloy as a raw material with other neodymium-iron-boron raw materials together. The method comprises the following steps: smelting the Fe-Ga alloy and other neodymium-iron-boron raw materials together, then carrying out powder preparation, oriented pressing, sintering and tempering heat treatment to obtain a product. Because the melting point of metal Ga is about 30 DEG C, the metal Ga easily forms a liquid state at normal temperature, and if the metal Ga is taken as the raw material, the metal Ga generally needs to be enclosed into a Fe or Nd block through punching when a neodymium-iron-boron alloy ingredient is smelted. According to the method, the melting point of the Fe-Ga alloy is far higher than normal temperature, the Ga element is added in the form of the Fe-Ga alloy, so that the step of enclosing the metal Ga into the Fe-or Nd block through the punching can be completely omitted, the volatilization of the Ga element in a smelting process can be greatly reduced, the utilization rate of Ga is enhanced, and further higher magnet property is obtained. The method disclosed by the invention can effectively utilize the waste product obtained in the production of the magnetostrictive material Fe-Ga alloy and is easy to operate and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, and in particular provides a method for alloying Ga elements with NdFeB permanent magnet materials. technical background [0002] NdFeB permanent magnets are widely used in electronics, automobiles, computers, electric power, machinery, energy, environmental protection, national defense, Medical equipment and many other fields. In recent years, my country's NdFeB manufacturing technology has made remarkable progress, permanent magnet equipment has been continuously developed and improved, new technologies have been adopted, and product grades have been rapidly improved. For example, the traditional ingot casting technology is changed to the scale ingot casting technology SC which is nearly rapidly cooled and solidified; the hydrogen broken HD and the improved jet mill JM powder making technology are used to make the powder particles finer and have a narrower size distribution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04B22F3/16H01F1/057
Inventor 包小倩汤明辉卢克超高学绪
Owner UNIV OF SCI & TECH BEIJING
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