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A kind of solder for brazing sintered NdFeB magnet with nickel-plated layer and its preparation method

A technology of neodymium-iron-boron and nickel-plated layer, which is applied in the field of brazing material and preparation of sintered neodymium-iron-boron magnets, can solve the problems of high melting point, magnetic properties of magnets, corrosion-resistant coating damage, thermal influence of magnets, etc., and achieves simple preparation process, Excellent brazing process and reduced energy consumption

Active Publication Date: 2021-01-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since brazing has the characteristics of low welding temperature and wide adaptability of the base metal of the weldment, it is widely used. Theoretically, it can be used to connect and fix sintered NdFeB magnets. However, for permanent magnetic functional materials such as sintered NdFeB magnets, especially It is a sintered NdFeB magnet with a corrosion-resistant coating on the surface. Brazing must solve two core technical problems: 1. Connection strength; 2. The brazing temperature field may damage the magnetic properties of the magnet and the corrosion-resistant coating
The disclosed solders have high melting points, which will inevitably have adverse thermal effects on the magnet during the brazing process. Therefore, a solder with a low melting point and excellent brazing performance has been developed to meet the requirements of having a corrosion-resistant coating on the surface. The connection and assembly of sintered NdFeB magnets have important industrial application significance and broad application prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Al, Si, Zn, Ge, Ag, Ni, Bi, La, Ce and Cu with a purity greater than 99.6% are used as raw materials, and the ratio by mass percentage is: Al: 10.0%, Si: 8.0%, Zn: 5.0% , Ge: 4.0%, Ag: 6.0%, Ni: 5.0%, Bi: 0.40%, La: 0.45%, Ce: 0.55%, the rest is Cu to form the ingredients, put it into the vacuum induction melting furnace, and draw the 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 RE, Ge, Zn, etc. 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 ...

Embodiment 2

[0027] Al, Si, Zn, Ge, Ag, Ni, Bi, La, Ce and Cu with a purity greater than 99.6% are used as raw materials, and the ratio by mass percentage is: Al: 11.0%, Si: 9.0%, Zn: 4.5% , Ge: 3.0%, Ag: 5.0%, Ni: 4.5%, Bi: 0.40%, La: 0.45%, Ce: 0.55%, the rest is Cu to form the ingredients, put it into the vacuum induction melting furnace, and draw the 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 RE, Ge, Zn, etc. 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 ...

Embodiment 3

[0029] Al, Si, Zn, Ge, Ag, Ni, Bi, La, Ce and Cu with a purity greater than 99.6% are used as raw materials, and the ratio by mass percentage is: Al: 12.0%, Si: 9.5%, Zn: 5.0% , Ge: 3.5%, Ag: 5.5%, Ni: 5.0%, Bi: 0.35%, La: 0.40%, Ce: 0.50%, the rest is Cu to form the ingredients, put it into the vacuum induction melting furnace, and draw the 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 RE, Ge, Zn, etc. 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 ...

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Abstract

The invention discloses a brazing filler metal for braze welding of a sintered neodymium-iron-boron magnet with a nickel-plated layer and a preparation method. The brazing filler metal comprises the following components in percentage including, by mass, 10.0-12.0% of Al, 8.0-9.5% of Si, 4.5-5.0% of Zn, 3.0-4.0% of Ge, 5.0-6.0% of Ag, 4.5-5.0% of Ni, 0.35-0.40% of Bi, 0.40-0.45% of La, 0.40-0.55% of Ce, and the balance copper. The brazing filler metal is prepared by using the rapid metal cooling technology, the melting point is lower than 532 DEG C, and the brazing filler metal is suitable forvacuum braze welding of the sintered neodymium-iron-boron magnet with the nickel-plated layer and heterogeneous materials, such as 10# steel and pure iron, wherein the braze welding temperature is 545-560 DEG C, and the shearing intensity of a braze welding joint is higher than 41 MPa.

Description

technical field [0001] The invention belongs to the technical field of metal material welding, and in particular relates to a brazing material for brazing a sintered NdFeB magnet with a nickel layer 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 magn...

Claims

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Application Information

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Patent Type & Authority Patents(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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