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Agglutination type composite permanent magnetic material of neodymium, iron, boron and iron base soft magnetic powder and its preparing method

A composite permanent magnet material and soft magnetic powder technology, which is applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problem of large temperature coefficient of rare earth permanent magnet alloy and ferrite, specific gravity of rare earth permanent magnet alloy and ferrite powder Large difference, poor thermal stability and other problems, to achieve the effect of improving comprehensive physical properties, facilitating industrial production, and simple production process

Inactive Publication Date: 2003-07-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Japanese patent JP61-284906A has announced a kind of rare earth permanent magnetic alloy powder and the bonding type permanent magnetic material of ferrite phase compound, although this material can obtain certain magnetic performance and cost reduces significantly, there is following problem: ( 1) In order to prevent corrosion, electrophoretic coating protection is required on the composite permanent magnet material, but due to the non-conductivity of ferrite, a uniform and complete electrophoretic resin coating cannot be formed on the surface of the composite permanent magnet material, so it cannot effectively protect the poles. NdFeB that is easily oxidized; (2) The temperature coefficient (Br) of rare earth permanent magnet alloy and ferrite is large, resulting in poor thermal stability; (3) The specific gravity of rare earth permanent magnet alloy and ferrite powder is very different Large, difficult to mix evenly, difficult to ensure the stability of magnetic properties; (4) If the cold pressing molding process is used, irregularly shaped particles are required, and the green compact strength of spherical powder pressing is very low
[0006] Chinese patent ZL94111737.5 discloses a plastic bonded AlNiCo and NdFeB composite permanent magnet material. The component AlNiCo alloy magnetic powder in this composite permanent magnet material contains strategic element cobalt and Chinese resources Nickel reserves are relatively small, so the price of this alloy powder is relatively high (the current price is generally around 180RMB / kg), which cannot effectively reduce the cost of composite permanent magnet materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this embodiment, there are 9 kinds of mixed magnetic powders with different formulations (see Table 1 and Table 2); the NdFeB magnetic powder is selected from MQP-B magnetic powder, and the iron-based soft magnetic powder is prepared from an iron-silicon-boron-based alloy, which is smelted into an ingot and carried out Rapid quenching to obtain amorphous thin strips, the crystallization temperature of the amorphous thin strips is 500 ° C, the crystallization time is 1 hour, and the ball milling time is 20 minutes in a vacuum ball mill filled with argon after crystallization; the binder is selected Epoxy resin, content is 2.5% (percentage by weight), the content of mixed magnetic powder is 97.5% (percentage by weight); Mixed magnetic powder with different proportions is coated with silane, then add epoxy resin binder and mix evenly, in the press Upper compression molding, the molding pressure is selected as 8T, and the moldings are all standard samples of φ10×10mm.

...

Embodiment 2

[0035] In this embodiment, the formula of the mixed magnetic powder is 80% (percentage by weight) of NdFeB magnetic powder, 20% (percentage by weight) of iron-based soft magnetic powder; Iron-silicon-boron-based alloys are smelted into ingots and then rapidly quenched to obtain amorphous thin strips. The crystallization temperature of the amorphous thin strips is 500 ° C, and the crystallization time is 1 hour. The time of ball milling is 20 minutes; the binder is epoxy resin, the content is 2% (weight percentage), the content of the mixed magnetic powder is 98% (weight percentage); the mixed magnetic powder is coated with silane, and then added Mix the agent evenly, press and form on the press, the forming pressure is selected as 8T, and the formed body is φ10×10mm. The density of the composite permanent magnet material is 6.272g / cm 3 , The magnetic properties are remanence Br=6.481KGs, magnetic induction coercive force Hcb=4.474koe, intrinsic coercive force Hcj=8.937koe, ma...

Embodiment 3

[0037] In this embodiment, the formula of mixed magnetic powder is 60% (weight percentage) of NdFeB magnetic powder, 40% (weight percentage) of iron-based soft magnetic powder; Iron-silicon-boron-based alloys are smelted into ingots and then rapidly quenched to obtain amorphous thin strips. The crystallization temperature of the amorphous thin strips is 450°C and the crystallization time is 1.5 hours. The time of medium ball milling is 20 minutes; the binder is selected from phenolic resin, the content is 3.5% (weight percent), and the content of the mixed magnetic powder is 96.5% (weight percent); the mixed magnetic powder is coated with silane, and then the binder is added Mix evenly, press and form on a press, the forming pressure is selected as 10T, and the formed body is φ10×10mm. The density of the composite permanent magnet material is 5.941g / cm 3 , The magnetic properties are remanence Br=5.122KGs, magnetic induction coercive force Hcb=2.865koe, intrinsic coercive for...

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Abstract

The compoiste permanent mangetic material is composed of the mixed powder of neodymium, iron, boron and the iron base soft magnetic powder as wellas the macromolecule aggloomerant. The formula (weight percent) of the mixed powder and the macromolecule agglomerant are: the mixed powder 95%-98.5%, the macromolecule agglomerant 1.5%-5%. The formula (weight percent) of the mixed powder of neodymium, iron, boron and the iron base soft magentic powder are: neodymium, iron and boron magentic powder 10%-90%, the iron base soft magnetic powder 10%-90%. The manufacturing procedures are as follows. (1) Preparing the iron base soft magnetic powder: melting the iron base material, casting to ingots, quenching and crystallizing, finally ball milling in argon gas atmosphere. (2) Preparing the composite permanent magnetic material: cadding processing by silicane.

Description

1. Technical field [0001] The invention belongs to bonded permanent magnet materials, in particular to bonded permanent magnet materials compounded by two or more alloy powders. 2. Background technology [0002] Japanese patent JP61-284906A has announced a kind of rare earth permanent magnetic alloy powder and the bonding type permanent magnetic material of ferrite phase compound, although this material can obtain certain magnetic performance and cost reduces significantly, there is following problem: ( 1) In order to prevent corrosion, electrophoretic coating protection is required on the composite permanent magnet material, but due to the non-conductivity of ferrite, a uniform and complete electrophoretic resin coating cannot be formed on the surface of the composite permanent magnet material, so it cannot effectively protect the poles. NdFeB that is easily oxidized; (2) The temperature coefficient (Br) of rare earth permanent magnet alloy and ferrite is large, resulting i...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/22
Inventor 刘颖李军涂铭旌高升吉
Owner SICHUAN UNIV
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