Foil strip brazing filler metal for brazing sintered neodymium-iron-boron permanent magnet materials and preparation method

A permanent magnet material, neodymium-iron-boron technology, applied in welding equipment, welding/cutting medium/material, welding medium, etc., can solve the problems of high cost, complicated production technology, long soldering process, etc., to achieve easy operation, The effect of low process consumption and good brazing process

Active Publication Date: 2020-05-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solder has a high melting point (600-850°C), and it will inevitably have a thermal impact on the magnet during the welding process. At the same time, the solder processing process is long (the mixed metal raw materials are melted by induction melting to obtain the alloy liquid, and then Casting into columnar or plate ingots, and finally multi-pass extrusion, drawing or rolling into strips or filaments), the production technology is more complicated and the cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Nd, Al, Si, Zn, Ge, Ag, Bi, Cu with a purity greater than 99.6% are used as raw materials, and the proportions by mass percentage are: Nd: 7.0%, Al: 20.0%, Si: 9.0%, Zn: 4.0 %, Ge: 2.0%, Ag: 4.0%, Ga: 0.6%, Bi: 0.45%, the balance is Cu, put it into a vacuum induction melting furnace, and draw a vacuum to 4.0×10 -3 Pa, filled with 0.06MPa pure argon for induction melting, fully alloyed and poured into the water-cooled copper mold in the furnace to obtain rod-shaped master alloy ingots. In order to ensure that the composition of the ingot meets the design composition, attention must be paid to the loss of Nd, Ge, and Zn during the smelting process. After the master alloy ingot is prepared, it is taken out from the induction furnace and broken into small pieces of 4-5g. After removing the scale, it is placed in acetone and ultrasonically cleaned to remove surface impurities; it is dried and then placed into the quartz tube in the vacuum spin quenching system. In the middl...

Embodiment 2

[0029] Nd, Al, Si, Zn, Ge, Ag, Bi, Cu with a purity greater than 99.6% are used as raw materials, and the proportions by mass percentage are: Nd: 8.0%, Al: 19.0%, Si: 8.0%, Zn: 3.5 %, Ge: 1.0%, Ag: 3.0%, Ga: 0.5%, Bi: 0.40%, the balance is Cu, put it into a vacuum induction melting furnace, and draw a vacuum to 4.0×10 -3 Pa, filled with 0.06MPa pure argon for induction melting, fully alloyed and poured into the water-cooled copper mold in the furnace to obtain rod-shaped master alloy ingots. In order to ensure that the composition of the ingot meets the design composition, attention must be paid to the loss of Nd, Ge, and Zn during the smelting process. After the master alloy ingot is prepared, it is taken out from the induction furnace and broken into small pieces, 4-5g small pieces. After removing the scale, it is placed in acetone and ultrasonically cleaned to remove surface impurities; it is dried and then placed in a vacuum spin quenching system In the quartz tube, start...

Embodiment 3

[0031] Nd, Al, Si, Zn, Ge, Ag, Bi, Cu with a purity greater than 99.6% are used as raw materials, and the proportions by mass percentage are: Nd: 7.5%, Al: 19.5%, Si: 8.5%, Zn: 5.0 %, Ge: 1.5%, Ag: 3.5%, Ga: 0.6%, Bi: 0.45%, the balance is Cu, put it into a vacuum induction melting furnace, and draw a vacuum to 4.0×10 -3 Pa, filled with 0.06MPa pure argon for induction melting, fully alloyed and poured into the water-cooled copper mold in the furnace to obtain rod-shaped master alloy ingots. In order to ensure that the composition of the ingot meets the design composition, attention must be paid to the loss of Nd, Ge, and Zn during the smelting process. After the master alloy ingot is prepared, it is taken out from the induction furnace and broken into small pieces, then put into the quartz tube in the vacuum spin quenching system, the vacuum spin quenching system is started, and the vacuum of the induction furnace chamber is drawn to 4.0×10 -3 After the Pa is filled with 0.0...

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Abstract

The invention discloses a foil strip brazing filler metal for brazing sintered neodymium-iron-boron permanent magnet materials and a preparation method. The brazing filler metal comprises the following components in percentage by mass: 7.0-8.0% of Nd, 19.0-20% of Al, 8.0-9.0% of Si, 4.0-5.0% of Zn, 1.0-2.0% of Ge, 3.0-4.0% of Ag, 0.5-0.6% of Ga, 0.35-0.45% of Bi, and the balance Cu. The brazing filler metal is prepared by a melt quick cooling technology, has a melting point lower than 580 DEG C, is suitable for vacuum brazing of sintered neodymium-iron-boron magnet homogeneous materials, in particular high-coercivity H, UH magnets, and can be used for vacuum brazing of sintered neodymium-iron-boron magnets and carbon structural steel heterogeneous materials such as 10# steel; the brazing temperature is 590-605 DEG C; and the brazing joint shearing strength is higher than 55MPa.

Description

technical field [0001] The invention belongs to the technical field of metal material welding, and in particular relates to a foil brazing material for sintered NdFeB permanent magnet material brazing and a preparation method thereof. Background technique [0002] Permanent magnetic materials have the function of mutual conversion between mechanical energy and electromagnetic energy, and can be made into various forms of functional devices. They are an important material basis for high-tech, emerging industries and social progress. Permanent magnet materials include metal permanent magnet materials, ferrite permanent magnet materials and rare earth permanent magnet materials. Rare earth permanent magnet materials are rare earth elements RE (Sm, Nd, Pr, Dy, Tb, etc.) and transition metals TM (Fe, Co, etc.) ) formed a class of high-performance permanent magnet materials, among which NdFeB rare earth permanent magnet materials are the third generation of rare earth permanent ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/14
CPCB23K35/0233B23K35/302
Inventor 罗伟严密周健胡磊许文韬吴琛
Owner ZHEJIANG UNIV
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