Manufacturing method of high-residual magnetism high-coercive force rare earth permanent magnetic material

A high-coercivity, rare-earth permanent magnet technology, used in magnetic materials, magnetic objects, electrical components, etc., can solve the problems that cannot be mass-produced, permanent magnet materials are only suitable for small or thin magnets, etc. The effect of increasing tenacity

Active Publication Date: 2010-05-12
YANTAI DONGXING MAGNETIC MATERIALS INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a kind of manufacturing method of rare earth permanent magnet material with high remanence and high coercive force, mainly solve the problem that existing permanent magnet materials are only suitable for small or thin magnets and cannot be batched Production and other issues, so as to improve the efficiency of absorption, and achieve mass production of large-scale high-remanence and high-coercivity permanent magnet materials, especially in the field of new energy, such as wind power generators, compressor motors and hybrid vehicles fields of electric motors and generators

Method used

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  • Manufacturing method of high-residual magnetism high-coercive force rare earth permanent magnetic material
  • Manufacturing method of high-residual magnetism high-coercive force rare earth permanent magnetic material
  • Manufacturing method of high-residual magnetism high-coercive force rare earth permanent magnetic material

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Experimental program
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Effect test

Embodiment 1

[0024]Embodiment 1, preparation of master alloy: smelting metal or alloy raw materials in vacuum or inert gas atmosphere, preferably in argon atmosphere, the alloy is composed of 22% by weight of neodymium, 2% by weight of dysprosium, 7% by weight of praseodymium, 1% by weight Cobalt by weight, 1% by weight of boron, 0.3% by weight of aluminum, 0.1% by weight of copper and the balance of iron. The molten alloy is poured through the quick-setting thin strip process to obtain flake alloy flakes with a thickness between 0.2 and 0.5 mm;

[0025] Pulverization: The above-mentioned master alloy is crushed to a size of 0.1-10 mm by hydrogen, and then crushed to an average particle size of 5.0 μm on a jet mill using high-pressure nitrogen;

[0026] Molding: the fine powder produced by the above method is molded under a magnetic field, and the strength of the magnetizing magnetic field is 2 Tesla. And the density of the magnet after molding is 4.0~4.3g / cm 3 , and then carry out isost...

Embodiment 2-4

[0041] Embodiment 2-4: First, by the same process as the manufacturing process of Example 1, a plurality of sintered magnets of 10 mm × 10 mm × 10 mm are produced and then the sintered magnets are respectively buried in dysprosium copper (dysprosium 86% by weight, copper 14% by weight), Mixture of terbium copper (terbium 85% by weight, copper 15% by weight), dysprosium nickel (dysprosium 54% by weight, nickel 46% by weight) alloy with 30% by weight of dysprosium oxide, 30% by weight of dysprosium fluoride, 40% by weight of dysprosium oxyfluoride pink. The weight ratio of the alloy powder and the compound powder is 4:1, and the absorption treatment is carried out at 1000° C., and the absorption treatment time is 1 hour. After the absorption treatment, the magnet needs to be subjected to aging treatment, the temperature of the aging treatment is 520° C., and the aging time is 2 hours. Samples were made by conventional techniques.

[0042] After the sample was magnetized by a 6...

Embodiment 5-8

[0046] Embodiment 5-8, at first through the same process as the manufacturing process of embodiment 1, a plurality of sintered magnets of 5 mm × 5 mm × 5 mm are produced and then the sintered magnets are respectively embedded in dysprosium copper (dysprosium 86% by weight, copper 14% by weight) alloy Mixed powder with dysprosium oxide, dysprosium fluoride, dysprosium oxyfluoride and 50% by weight of dysprosium fluoride and 50% by weight of dysprosium oxyfluoride. The weight ratio of the alloy powder and the compound powder is 1:4, and the absorption treatment is carried out at 600° C., and the absorption treatment time is 20 hours. After the absorption treatment, the magnet needs to be subjected to aging treatment, the temperature of the aging treatment is 520° C., and the aging time is 2 hours. Samples were made by conventional techniques.

[0047] After the sample was magnetized by a 6 Tesla magnetic field, the results of comparative measurement of magnetic properties are s...

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Abstract

The invention discloses a manufacturing method of a high-residual magnetism high-coercive force rare earth permanent magnetic material, which comprises the processing steps of master alloy preparation, crushing, molding, sintering to manufacture sintered magnets, aging treatment, machining and surface treatment, and is characterized in that after the processing step of sintering to manufacture the sintered magnets R1-T-B-M1, the sintered magnets are embedded into a mixed powder consisting of one or more components of HR2M2 and R3 oxide, R4 fluoride and R5 oxyfluoride, the magnets are separated from each other, and conducting absorption on the sintered magnets embedded in the mixed powder in vacuum or inactive gas at the temperature equal to or less than the sintering temperature of the magnets for 1-20 hours. In the method, the coercive force of the permanent magnetic material is significantly improved under the condition that residual magnetism basically does not change, the absorption efficiency is improved simultaneously, mass production can be achieved, and larger-sized high-residual magnetism high-coercive force rare earth permanent magnetic material of can be produced.

Description

Technical field: [0001] The invention relates to the technical field of permanent magnet materials, in particular to a method for manufacturing rare earth permanent magnet materials with high remanence and high coercivity, that is, a method for effectively increasing the coercivity of sintered magnets without significantly reducing the remanence , and provide an economical and effective manufacturing method suitable for mass production for rare earth permanent magnet materials with large size and orientation direction thickness. Background technique: [0002] With the development of the new energy industry and technological progress around the world, the application range of high-performance sintered NdFeB permanent magnet materials continues to expand, from communication electronics, such as voice coil motor motors (VCM motors) of hard disk drives, CD / DVD pickups (PickUp), mobile phones, nuclear magnetic resonance imaging medical equipment, continue to develop towards high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057
Inventor 林喜峰丁开鸿崔胜利
Owner YANTAI DONGXING MAGNETIC MATERIALS INC
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