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Method for preparing NdFeB/SmCo5 composite permanent magnet doped with PrCu alloy by adopting thermal deformation method

A technology of composite magnets and permanent magnets, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as difficult to carry out, prone to micro-cracks, and reduce coercive force, so as to improve coercive force, Good magnetic properties, the effect of weakening the exchange coupling effect

Inactive Publication Date: 2017-01-04
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Original NdFeB / SmCo 5 Composite magnets during thermal deformation, NdFeB and SmCo at high temperature 5 There are some diffusion phenomena between the two phases, and some impurity phases are produced to seriously reduce the coercive force
In addition, NdFeB and SmCo 5 There is a deformation inconsistency between the SmCo 5 It is more difficult to deform than the NdFeB phase, so during hot deformation, SmCo 5 prone to microcracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Melting. NdFeB purchased nanocrystalline NdFeB ribbon flakes; SmCo 5 The ingots were prepared by a suspension melting furnace; Pr 10 Cu 90 The low melting point alloy is prepared by suspension melting furnace;

[0024] (2) Grinding NdFeB powder. NdFeB flakes are ground and passed through a 200-mesh sieve to obtain NdFeB fine powder;

[0025] (3) Preparation of SmCo 5 powder. SmCo was processed by high energy ball milling 5 Ingot ball milling into SmCo 5 Amorphous powder;

[0026] (4) Prepare PrCu powder. Rapidly quenching the PrCu alloy to obtain a rapidly quenched thin strip, and then ball milling the PrCu thin strip into PrCu amorphous powder by high-energy ball milling method;

[0027] (5) Mix powder. NdFeB powder (80wt.%), SmCo 5 Powder (20wt.%) and PrCu powder are mixed evenly, and PrCu powder accounts for 2wt.% of total weight;

[0028] (6) Powder molding. Put the uniformly mixed composite powder into the WC cemented carbide mold;

[0029](7) Ho...

Embodiment 2

[0038] (1) Melting. NdFeB is purchased nanocrystalline NdFeB ribbon flakes; SmCo 5 The ingots were prepared by a suspension melting furnace; Pr 30 Cu 70 The low melting point alloy is prepared by suspension melting furnace;

[0039] (2) Grinding NdFeB powder. NdFeB flakes are ground and passed through a 200-mesh sieve to obtain NdFeB fine powder;

[0040] (3) Preparation of SmCo 5 powder. SmCo was processed by high energy ball milling 5 Ingot ball milling into SmCo 5 Amorphous powder;

[0041] (4) Prepare PrCu powder. Rapidly quenching the PrCu alloy to obtain a rapidly quenched thin strip, and then ball milling the PrCu thin strip into PrCu amorphous powder by high-energy ball milling method;

[0042] (5) Mix powder. NdFeB powder (60wt.%), SmCo 5 Powder (40wt.%) and PrCu powder are mixed evenly, and PrCu powder accounts for 6wt.% of total weight;

[0043] (6) Powder molding. Put the uniformly mixed composite powder into the WC cemented carbide mold;

[0044] (7...

Embodiment 3

[0053] (1) Melting. NdFeB is purchased nanocrystalline NdFeB ribbon flakes; SmCo 5 The ingots were prepared by a suspension melting furnace; Pr 60 Cu 40 The low melting point alloy is prepared by suspension melting furnace;

[0054] (2) Grinding NdFeB powder. NdFeB flakes are ground and passed through a 200-mesh sieve to obtain NdFeB fine powder;

[0055] (3) Preparation of SmCo 5 powder. SmCo was processed by high energy ball milling 5 Ingot ball milling into SmCo 5 Amorphous powder;

[0056] (4) Prepare PrCu powder. Rapidly quenching the PrCu alloy to obtain a rapidly quenched thin strip, and then ball milling the PrCu thin strip into PrCu amorphous powder by high-energy ball milling method;

[0057] (5) Mix powder. NdFeB powder (40wt.%), SmCo 5 Powder (60wt.%) and PrCu powder are mixed evenly, and PrCu powder accounts for 10wt.% of total weight;

[0058] (6) Powder molding. Put the uniformly mixed composite powder into the WC cemented carbide mold;

[0059] (...

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Abstract

The invention relates to a method for preparing an NdFeB / SmCo5 composite permanent magnet doped with PrCu alloy by adopting a thermal deformation method and belongs to the technical field of magnetic materials. The ratio of the weight of PrCu alloy powder for doping to the weight of total powder is 2-15 weight percent. The deformation quantity of the composite magnet is 60-90 percent. The SPS technology thermal deformation method is adopted for preparing the NdFeB / SmCo5 thermal deformation composite rare earth permanent magnet doped with the PrCu alloy; in the process of thermal deformation, as a boundary phase, a PrCu phase can isolate two hard magnetic phases, so that the mutual diffusion is reduced, an exchange coupling effect between the two phases is weakened, and the coercive force is improved; in the process of thermal deformation, after being liquefied, the PrCu phase is diffused at a crystal boundary and can also coordinate the thermal deformation of the two phases to promote the thermal deformation of the two phases; the obtained nanocrystalline NdFeB / SmCo5 composite magnet doped with the PrCu alloy has good magnetic property, thermal stability, corrosion resistance and mechanical property.

Description

technical field [0001] The invention is a NdFeB / SmCo doped PrCu alloy prepared by hot pressing and hot deformation method using spark plasma sintering technology. 5 A method for compounding rare earth permanent magnets belongs to the technical field of magnetic materials. Background technique [0002] Sintered NdFeB rare earth permanent magnet is the most magnetic permanent magnet material so far. It is widely used in many fields such as electronics, electromechanical, instrumentation and medical treatment. It is the fastest growing permanent magnet material with the best market prospect in the world today. The NdFeB type magnet has high saturation magnetization, low thermal stability (low coercive force at high temperature), and its Curie temperature is about 580K, which limits its application at high temperature. With the rapid development of electric vehicles and hybrid vehicles, the working temperature of permanent magnets is required to be above 200°C. Therefore, highe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/105
CPCH01F1/0575B22F3/105H01F41/0273
Inventor 岳明周德世张东涛刘卫强路清梅吴琼张红国
Owner BEIJING UNIV OF TECH
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