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Sintered Nd-Fe-B permanent magnet producing method

A technology of permanent magnets and NdFeB, applied in the direction of magnetic objects, inductors/transformers/magnet manufacturing, magnetic materials, etc., can solve the problems of shrinking application market, spread, unfavorable industry development, etc., to promote comprehensive utilization and reduce industrial costs , Improving the effect of the magnetocrystalline anisotropy field

Active Publication Date: 2015-10-07
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Abnormally high raw material prices have spread to the downstream industrial chain, causing some application markets to shrink. In the long run, it is not conducive to the development of the entire industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The sintered NdFeB permanent magnet is prepared according to the steps of "smelting → crushing → powder making → pressing molding → sintering and aging treatment". In the smelting step, the main phase alloy is (La 0.08 Ce 0.12 Gd 0.08 Dy 0.005 PrN 0.715 ) 0.29 (Al 0.007 Cu 0.0014 co 0.0057 Fe 0.9859 ) 0.70 B 0.01 , the composition of the PrNd-rich liquid phase alloy is (La 0.03 Ce 0.05 Gd 0.02 PrN 0.90 ) 0.55 (Al 0.68 Cu 0.23 co 0.91 Fe 0.9818 ) 0.44 B 0.01 , the composition of the liquid phase alloy rich in LaCe is (La 0.20 Ce 0.25 Gd 0.10 Dy 0.006 PrN 0.444 ) 0.45 (Al 0.0056 Cu 0.0028 co 0.0093 Fe 0.9823 ) 0.54 B 0.01 , where the mass percentages among the main phase, PrNd-rich phase, and LaCe-rich phase are 83%, 6.8%, and 10.2% in sequence, and the three alloys are smelted respectively;

[0027] In the powder making step, the amount of oxygen added is 100ppm; the specific surface average particle size SMD of the magnetic powder measur...

Embodiment 2

[0032] NdFeB permanent magnets are prepared according to the steps of "smelting → crushing → powder making → pressing molding → sintering and aging treatment". In the smelting step, the main phase alloy is (La 0.08 Ce 0.12 Gd 0.08 Dy 0.006 PrN 0.714 ) 0.298 (Al 0.0072 Cu 0.0014 co 0.0072 Fe 0.9841 ) 0.692 B 0.01 , the composition of the PrNd-rich liquid phase alloy is (La 0.03 Ce 0.05 Gd 0.02 Dy 0.005 PrN 0.895 ) 0.55 (Al 0.0068 Cu 0.0023 co 0.0045 Fe 0.9864 ) 0.44 B 0.01 , the composition of the liquid phase alloy rich in LaCe is (La 0.20 Ce 0.25 Gd 0.10 Dy 0.006 PrN 0.444 ) 0.45 (Al 0.0056 Cu 0.0028 co 0.0074 Fe 0.9842 ) 0.54 B 0.01 , wherein the mass percentages among the main phase, PrNd-rich phase, and LaCe-rich phase are 90%, 5%, and 5% in sequence, and the three alloys are smelted separately;

[0033] In the powder making step, the amount of oxygen added is 80ppm; the specific surface average particle size SMD of the magnetic powder mea...

Embodiment 3

[0038] NdFeB permanent magnets are prepared according to the steps of "smelting → crushing → powder making → pressing molding → sintering and aging treatment". In the smelting step, the main phase alloy is (La 0.06 Ce 0.12 Ho 0.04 Dy 0.08 PrN 0.7 ) 0.3 (Al 0.0116 Cu 0.0014 co 0.0058 Ga 0.0014 Nb 0.0058 Fe 0.974 ) 0.69 B 0.01 , the composition of the PrNd-rich liquid phase alloy is (La 0.03 Ce 0.05 Dy 0.005 PrN 0.915 ) 0.55 (Al 0.0068 Cu 0.0023 co 0.0045 Fe 0.9864 ) 0.44 B 0.01 , the composition of the liquid phase alloy rich in LaCe is (La 0.20 Ce 0.20 Gd 0.042 Dy 0.004 PrN 0.554 ) 0.45 (Al 0.0056 Cu 0.0028 co 0.0074 Fe 0.9842 ) 0.54 B 0.01 , wherein the mass percentages among the main phase, PrNd-rich phase, and LaCe-rich phase are 90%, 6%, and 4% in sequence, and the three alloys are smelted separately;

[0039] In the powder making step, the amount of oxygen added is 50ppm; the specific surface average particle size SMD of the magnetic pow...

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Abstract

The invention relates to a sintered Nd-Fe-B permanent magnet producing method and belongs to the field of magnetic materials. The sintered Nd-Fe-B permanent magnet preparing method comprises the following steps of smelting, crushing, powder making, pressing for forming, sintering and aging treatment. According to the technical scheme, a certain proportion of abundant rare earth elements including La, Ce and Gd are utilized to partially replace elements Pr, Nd, Dy, Tb and the like, comprehensive utilization of rare earth resources is promoted by means of a produced sintered Nd-Fe-B permanent magnet, and the industrial cost of the sintered Nd-Fe-B permanent magnet is reduced. In the magnet producing process, liquid-phase alloy rich in Pr-Nd phases and liquid-phase alloy rich in La-Ce phases are respectively smelt, the wettability of a main phase and magneto-crystalline anisotropy field of a boundary phase are improved by means of the two rich rare earth phases, and crystal boundary is strengthened by doping Cu-Co nano alloy powder. Compared with a traditional single-alloy method process and a double-alloy method process, intrinsic coercive force and magnetic energy product in the magnet are improved, and the advantages are remarkable.

Description

technical field [0001] The invention relates to a preparation method of a sintered NdFeB permanent magnet, which belongs to the field of magnetic materials. Background technique [0002] With the development and application of new NdFeB magnetic materials, the scale of the NdFeB industry continues to grow, and the raw material metal neodymium and praseodymium neodymium alloy resources used for NdFeB magnets are becoming increasingly scarce. Neodymium metal and praseodymium neodymium alloy are extracted from primary ore sintering resources. Since lanthanum, cerium and other elements in mixed rare earth are not conducive to improving the magnetic properties of NdFeB magnets, they must be separated, refined and purified, and the cost of separation and purification is relatively high. high. [0003] At present, the price of praseodymium and neodymium alloys is about 4 to 6 times the price of sintering. In recent years, with the rapid development of sintered NdFeB permanent magn...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057H01F1/08B22F3/16
Inventor 李绪亮张鹏杰赵占中黄秀莲陈静武衣晓飞熊永飞
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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