Rare-earth magnet and Manufacturing method thereof

A rare earth magnet and manufacturing method technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of rising prices of magnets, stable supply of magnets, etc., to improve the characteristics of magnets, prevent the deterioration of magnet characteristics, improve the safety effect

Inactive Publication Date: 2006-01-25
HITACHI METALS LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, the addition of such high-priced rare elements will increase the price of magnets, and there is a problem of whether the supply of magnets can be stabilized.

Method used

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  • Rare-earth magnet and Manufacturing method thereof
  • Rare-earth magnet and Manufacturing method thereof
  • Rare-earth magnet and Manufacturing method thereof

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Embodiment Construction

[0044] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0045] [raw material alloy]

[0046] First, a raw material alloy of an R-Fe-B-based magnet alloy having a desired composition is prepared by a known strip casting method, and stored in a predetermined container. Specifically, first, an alloy having Nd: 8 to 30 at % (atomic %), B: 2 to 28 at %, and the remainder consisting of iron and unavoidable impurities is melted by high-frequency melting to form an alloy melt. liquid. Al, Ti, Cu, V, Cr, Zr, Ga, Mo, Nb, Mo, In, Sn, Hf, TaW, etc. can also be added to the alloy. After keeping the alloy melt at 1350° C., the alloy melt was rapidly cooled by a single roll method to obtain a flake alloy ingot with a thickness of about 0.3 mm. The rapid cooling conditions at this time were that the peripheral speed of the roll was 1 m / sec, the cooling rate was 500°C / sec, and the supercooling was 200°C. The quenched alloy slabs produced...

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Abstract

A compact is produced from an alloy powder for R-Fe-B type rare earth magnets including particles having a size in a range of about 2.0 mum to about 5.0 mum as measured by a light scattering method using a Fraunhofer forward scattering in a proportion of approximately 45 vol. % or more and particles having a size larger than about 10 mum in a proportion of less than about 1 vol. %. The compact is then sintered to obtain a R-Fe-B type rare earth magnet having an average crystal grain size in a range of about 5 mum to about 7.5 mum, and an oxygen concentration in a range of about 2.2 at. % to about 3.0 at. %. The invention improved rare earth magnet alloy powder in powder quality, for improving a sintered magnet in magnetic characteristics.

Description

technical field [0001] The present invention relates to an R-Fe-B series rare earth magnet and a method for producing the alloy powder for the magnet. Background technique [0002] Rare earth sintered magnets are produced by crushing alloy powders for rare earth magnets (raw material alloys) and then compressing and molding them, followed by sintering and aging heat treatment. Currently, two types of rare earth sintered magnets, samarium cobalt magnets and rare earth iron boron magnets, are widely used in various fields. Among them, rare-earth iron-boron magnets (hereinafter referred to as "R-Fe-B magnets". R is a rare earth element containing Y, Fe is iron, and B is boron) show the highest magnetic energy product among various magnets, and The price is relatively cheap, so it is actively used in various electronic devices. In addition, part of Fe may be replaced by transition metal elements such as Co, and part of B (boron) may be replaced by C (carbon). [0003] The raw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/08B22F1/00B22F9/04C22C38/00H01F1/057
CPCH01F1/0577
Inventor 高木繁槙田显
Owner HITACHI METALS LTD
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