Mg-Cu grain boundary modified high-magnetism sintered Nd-Fe-B magnet and preparation process thereof

A grain boundary modification, NdFeB technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve unsatisfactory problems, achieve low material cost, clear grain boundaries, and high comprehensive magnetic properties Effect

Active Publication Date: 2014-08-06
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method often makes the comprehensive magnetic performance index of Nd-Fe-B magnet (BH) max (MGOe)+ i H c (kOe) is less than 65, the status quo can not meet the society's high magnetic ( (BH) max (MGOe)+ i H c (kOe)≥65) Strong demand for NdFeB

Method used

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  • Mg-Cu grain boundary modified high-magnetism sintered Nd-Fe-B magnet and preparation process thereof
  • Mg-Cu grain boundary modified high-magnetism sintered Nd-Fe-B magnet and preparation process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Smelting: the main alloy and auxiliary alloy are prepared separately, the main alloy Nd 11.2 PR 2.3 Fe 80.6 B 5.9 After batching according to the chemical ratio, put it into the vacuum melting furnace, and pump the air in the furnace to 10 -3 After Pa, start heating and smelting, and carry out quick-setting flakes through a copper roller (surface linear velocity 1.8m / s), to obtain 0.25-0.35mm thick flakes; auxiliary alloy Mg 85.5 Cu 14.5 Put the ingredients into the vacuum induction furnace after proportioning, and pump the air in the furnace to 10 -3 After Pa, start heating and smelting. When the ingredients in the furnace are red, close the vacuum valve, fill with argon, and pour after the materials are melted to prepare auxiliary alloy ingots.

[0019] (2) Milling and powder mixing: the main alloy and the auxiliary alloy are milled separately, and the main alloy Nd 11.2 PR 2.3 Fe 80.6 B 5.9 The quick-setting flakes, after the hydrogen explosion (HD) proc...

Embodiment 2

[0029] (1) Smelting: the main alloy and auxiliary alloy are prepared separately, the main phase alloy Nd 12.2 La 1.0 Fe 80.7 B 6.1 After batching according to the chemical ratio, put it into the vacuum melting furnace, and pump the air in the furnace to 10 -3 After Pa, start heating and smelting, and carry out quick-setting flakes through copper rollers (surface line speed 1.8m / s), to obtain flakes with a thickness of 0.25-0.35mm; auxiliary alloy Mg 83.5 Cu 16.5 Put the ingredients into the vacuum induction furnace after proportioning, and pump the air in the furnace to 10 -3 After Pa, start heating and smelting. When the ingredients in the furnace are red, close the vacuum valve, fill with argon, and pour after the materials are melted to prepare auxiliary alloy ingots.

[0030] (2) Milling and powder mixing: the main alloy and the auxiliary alloy are milled separately, and the main alloy Nd 12.2 La 1.0 Fe 80.7 B 6.1 The quick-setting flakes, after the hydrogen explo...

Embodiment 3

[0040] (1) Smelting: the main alloy and auxiliary alloy are prepared separately, the main phase alloy Nd 12.1 PR 1.7 La 1.0 Fe 79.2 B 6.0 After batching according to the chemical ratio, put it into the vacuum melting furnace, and pump the air in the furnace to 10 -3 After Pa, start heating and smelting, and carry out quick-setting flakes through copper rollers (surface line speed 1.8m / s), to obtain flakes with a thickness of 0.25-0.35mm; auxiliary alloy Mg 80.0 Cu 20.0 Put the ingredients into the vacuum induction furnace after proportioning, and pump the air in the furnace to 10 -3 After Pa, start heating and smelting. When the ingredients in the furnace are red, close the vacuum valve, fill with argon, and pour after the materials are melted to prepare auxiliary alloy ingots.

[0041] (2) Milling and powder mixing: the main alloy and the auxiliary alloy are milled separately, and the main alloy Nd 12.1 PR 1.7 La 1.0 Fe 79.2 B 6.0 The quick-setting flakes, after th...

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Abstract

The invention discloses an Mg-Cu grain boundary modified high-magnetism sintered Nd-Fe-B magnet and a preparation process thereof. The Mg-Cu grain boundary modified high-magnetism sintered Nd-Fe-B magnet is represented by (RE<x>Fe<100-x-y>B<y>)<100-u> (Mg<100-z>Cu<z>), wherein RE comprises one or two of Nd, Pr, Ce and La. By adopting the mode of adding magnesium copper alloy into a grain boundary in primary alloy RE<x>Fe<100-x-y>B<y>, Mg and Cu do not diffuse into a principle phase of the magnet and can offer help to improving an organization structure of the grain boundary, improvement on H<c> and BH<max> without doping Dy / Tb is achieved, and comprehensive magnetic performance of the Mg-Cu grain boundary modified high-magnetism sintered Nd-Fe-B magnet satisfies the formula of (BH)<max>(MG0e)+ H<c>(K0e) >= 65. According the preparation method, the primary alloy RE<x>Fe<100-x-y>B<y> and auxiliary alloy Mg<100-z>Cu<z> are prepared through smelting methods, and powder preparation, and powder mixing, orientation forming, sintering and processing are performed on the primary alloy RE<x>Fe<100-x-y>B<y> and auxiliary alloy Mg<100-z>Cu<z> to obtain the permanent magnet. The preparation process is simple, and large-scale industrial production can be achieved by means of the preparation process.

Description

technical field [0001] The present invention relates to the technical field of permanent magnet materials, in particular to non-doped Dy / Tb and comprehensive magnetic properties ( (BH) max (MGOe)+ i H c (kOe) ≥ 65 magnesium copper grain boundary modified high magnetic sintered NdFeB magnet and its preparation process. Background technique [0002] Sintered neodymium iron boron (Nd-Fe-B) is a special metal functional material with high remanence, high magnetic energy product and high coercive force, which is widely used in electronic information, electrical engineering, computer, wind power generation, automobile and other fields. Since its inception, the Nd-Fe-B industry has developed rapidly. In 1984, the world output was only 32 tons, and in 2012 the output exceeded 150,000 tons. The development of NdFeB is mainly due to the high magnetic energy product of the material, but the actual intrinsic coercive force of the magnet ( i H c ) is often 1 / 3-1 / 30 of the theoret...

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 倪俊杰
Owner LIAOCHENG UNIV
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