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Large-size corrosion resisting neodymium iron boron permanent magnetic material and manufacturing process thereof

A permanent magnetic material and corrosion-resistant technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., to achieve the effects of reducing porosity, improving corrosion resistance, and increasing density

Active Publication Date: 2011-03-09
YANTAI DONGXING MAGNETIC MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention mainly solves the problems of poor corrosion resistance and small size of NdFeB permanent magnet materials produced by existing processes

Method used

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  • Large-size corrosion resisting neodymium iron boron permanent magnetic material and manufacturing process thereof
  • Large-size corrosion resisting neodymium iron boron permanent magnetic material and manufacturing process thereof
  • Large-size corrosion resisting neodymium iron boron permanent magnetic material and manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: The metal elements are mixed according to the following weight ratios, and prepared into flakes using the quick-setting thin strip process: Nd: 20%, Dy: 6%, Tb: 3%, Pr: 4%, Fe: 55%, Co : 10%, B: 1.1%, Cu: 0.5%, Al: 0.4%, the alloy is crushed by hydrogen gas, crushed by jet mill to make X50=6μm; X90 / X10=5 powder, and formed under vertical magnetic field press, wherein The orientation field is 15KOe, the pole head of the vertical field press is 200mm, and then isostatic pressing is carried out, and the isostatic pressing pressure is 250MPa; then sintering is carried out at 1060°C for 3 hours, and heat treatment is carried out after sintering. The primary temperature is 850°C, the time is 2.5 hours, the secondary temperature is 500°C, the time is 2.5 hours. The properties of the magnet are:

[0029] Magnetic properties: Remanence Br=1.151T

[0030] Intrinsic coercive force Hcj=2278KA / m

[0031] Magnetic energy product BHm=261KJ / m 3 ,

[0032...

Embodiment 2

[0036] Example 2: The metal elements are mixed according to the following proportions, and thin sheets are prepared by the quick-setting thin strip process: Nd: 18%, Dy: 10%, Pr: 3%, Fe: 61.4%, Co: 6%, B: 1 %, Cu: 0.15%, Al: 0.3%, Ga: 0.15%, crush the alloy with hydrogen gas, and use jet mill to make X50=4.0μm powder, X90 / X10=4.5, and shape it under vertical magnetic field press, where The orientation field is 20KOe, the pole head of the vertical field press is 300mm, then isostatic pressing is carried out, and the isostatic pressing pressure is 300MPa; then sintering is carried out at 1070°C for 4 hours, and heat treatment is carried out after sintering. The temperature is 900°C for 3 hours, and the secondary temperature is 580°C for 3 hours. The properties of the magnet are:

[0037] Magnetic properties: Remanence Br=1.179T

[0038] Intrinsic coercive force Hcj=2266KA / m

[0039] Magnetic energy product BHm=268KJ / m 3 ,

[0040] Blank size: 127mm×53mm×42mm...

Embodiment 3

[0043]Example 3: The metal elements are mixed according to the following proportions, and thin sheets are prepared by the quick-setting thin strip process: Nd: 24%, Tb: 5%, Fe: 67.00%, Co: 2%, B: 0.9%, Cu: 0.1 %, Ga: 1%, the alloy is crushed by passing hydrogen gas, and the powder of 4.5 μm is made by jet milling, X90 / X10=4, formed under a parallel magnetic field press, where the orientation field is 15KOe, and the coil diameter of the parallel field press is 250mm , and then isostatic pressing, the isostatic pressing pressure is 200MPa; then sintering, the sintering temperature is 1100°C, the time is 2 hours, heat treatment is carried out after sintering, the primary temperature is 850°C, the time is 2 hours, and the secondary temperature is 600°C for 2 hours. The properties of the magnet are:

[0044] Magnetic properties: Remanence Br=1.210T

[0045] Intrinsic coercive force Hcj=2046KA / m

[0046] Magnetic energy product BHm=282KJ / m 3 ,

[0047] Blank siz...

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Abstract

The invention discloses a large-size corrosion-resistant neodymium-ferrum-boron (Nd-Fe-B) permanent magnetic material and a preparation method thereof. The permanent magnetic material is characterized by the following metal elements (by weight percentage): Nd: x1%, Dy: x2%, Tb: x3%, Pr: x4%, Fe: y1%, Co: y2%, B: 0.9-1.1%, Cu: z1%, Al: z2%, and Ga: z3%; wherein x2 is higher than or equal to 0 and lower than or equal to 10, x3 is higher than or equal to 0 and lower than or equal to 5, x4 is higher than or equal to 0 and lower than or equal to 5, the sum of x1, x2, x3 and x4 is higher than or equal to 29 and lower than or equal to 33, y2 is higher than or equal to 0 and lower than or equal to 10, the sum of y1 and y2 is higher than or equal to 65 and lower than or equal to 69, z1 is higher than or equal to 0 and lower than or equal to 0.5, z2 is higher than or equal to 0 and lower than or equal to 1, and z3 is higher than or equal to 0 and lower than or equal to 1. The preparation methodcomprises the following steps: mixing the above elements and making into thin sheet alloy by using the rapid strip casing process, breaking, pulverizing to powder, press-forming under a parallel magnetic field and a vertical magnetic field, isostatic-pressing, and sintering to obtain the large-size corrosion-resistant Nd-Fe-B permanent magnetic material.

Description

Technical field: [0001] The invention relates to a permanent magnet material and a manufacturing method thereof, in particular to a large-size corrosion-resistant sintered NdFeB rare earth permanent magnet material and a manufacturing method thereof. The permanent magnet material is mainly used in permanent magnet direct drive high-power wind generators and high-power rare earth permanent magnet motors. [0002] Background technique: [0003] In 1983, Masato Sagawa of Japan Sumitomo Special Metals Co., Ltd. published the European patent on NdFeB permanent magnet materials, patent number: EP. It is the molecular formula of NdFeB permanent magnet material, the chemical composition and manufacturing method of the alloy. With the continuous expansion of the application field of sintered NdFeB permanent magnet materials, more requirements are put forward for sintered NdFeB permanent magnet materials. Especially as NdFeB permanent magnet materials are continuously applied to hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/12
Inventor 林喜峰丁开鸿陈刚彭众杰崔胜利赵大军吕思晶胡创朋林晓慧陈德金
Owner YANTAI DONGXING MAGNETIC MATERIALS INC