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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  • Abstract
  • Description
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  • Application Information

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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 spec

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1:

[0030] There are 9 kinds of mixed magnetic powders with different formulas in this example (see Table 1 and Table 2); MQP-B magnetic powder is selected for NdFeB magnetic powder, and FeSiB-based alloy is selected for the preparation of iron-based soft magnetic powder, which is smelted into ingots. Rapid quenching to obtain an amorphous thin ribbon, the crystallization temperature of the amorphous thin ribbon is 500 ° C, the crystallization time is 1 hour, and the time for ball milling in a vacuum ball mill filled with argon after crystallization is 20 minutes; the binder is selected Epoxy resin, the content is 2.5% (weight percent), and the content of the mixed magnetic powder is 97.5 percent (weight percent); the mixed magnetic powder in different proportions is coated with silane, and then the epoxy resin binder is added to mix evenly, and then press Press molding, the molding pressure is selected as 8T, and the moldings are standard samples of φ10×10mm. ...

Example Embodiment

[0034] Example 2:

[0035] In this embodiment, the formula of the mixed magnetic powder is 80% (weight percentage) of NdFeB magnetic powder, 20% (weight percentage) of iron-based soft magnetic powder; MQP-B magnetic powder is selected for NdFeB magnetic powder, and iron-based soft magnetic powder is selected for preparing iron-based soft magnetic powder. The iron-silicon-boron-based alloy is smelted into an ingot and then rapidly quenched to obtain an amorphous thin strip. The crystallization temperature of the amorphous thin strip is 500 ° C, and the crystallization time is 1 hour. The time of medium ball milling is 20 minutes; the binder is epoxy resin, the content is 2% (weight percent), and the content of the mixed magnetic powder is 98% (weight percent); the mixed magnetic powder is coated with silane, and then added to bond The agent is mixed evenly, and it is pressed and formed on a press. The forming pressure is selected as 8T, and the formed body is φ10×10mm. The den...

Example Embodiment

[0036] Example 3:

[0037] In this embodiment, the formula of the mixed magnetic powder is 60% (weight percent) of NdFeB magnetic powder, and 40% (weight percent) iron-based soft magnetic powder; MQP-B magnetic powder is selected for NdFeB magnetic powder, and iron-based soft magnetic powder is selected for preparing iron-based soft magnetic powder. The iron-silicon-boron-based alloy is smelted into an ingot and then quickly quenched to obtain an amorphous thin strip. The crystallization temperature of the amorphous thin strip is 450 ° C, and the crystallization time is 1.5 hours. The time of ball milling is 20 minutes; the binder is selected from phenolic resin, and 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 o...

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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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