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R-T-B alloy, method for producing the same, fine powder for R-T-B rare earth permanent magnet, and r-t-b rare earth permanent magnet

A rare earth permanent magnet, R-T-B technology, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., to achieve the effect of high coercivity and excellent magnetic properties

Inactive Publication Date: 2009-09-23
RESONAC HOLDINGS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, α-Fe exists as a peritectic nucleus, so its removal requires long solid-phase diffusion

Method used

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  • R-T-B alloy, method for producing the same, fine powder for R-T-B rare earth permanent magnet, and r-t-b rare earth permanent magnet
  • R-T-B alloy, method for producing the same, fine powder for R-T-B rare earth permanent magnet, and r-t-b rare earth permanent magnet
  • R-T-B alloy, method for producing the same, fine powder for R-T-B rare earth permanent magnet, and r-t-b rare earth permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0141] Weigh and prepare the raw material metal with an alloy composition of 23% Nd, 9% Dy, 0.98% B, 1% Co and 0.2% Ga and the balance Fe by mass ratio, and then put it in an alumina crucible by using a high-frequency melting furnace in an argon atmosphere at 1 atm to produce a molten alloy. This molten alloy is then supplied to Figure 11 in the casting facility in the manufacturing setup shown in and cast by the SC method. The rotation speed of the cooling roll in casting was 1.3 m / s, the average supply rate of the molten alloy supplied to the cooling roll was 30 g / s per 1 cm width, and the average temperature of the cast alloy ingot when leaving the cooling roll was 850°C.

[0142] The cooling rate of this alloy is 700°C / sec from the solidification point of the main phase to 1000°C, 200°C / sec from 1000°C to 850°C, and 50°C / sec from 850°C to 780°C. Thereafter, use Figure 11 In the manufacturing apparatus shown in , the alloy is held at a temperature of about 780° C. for ...

Embodiment 2

[0144] Molten alloys were produced using the same raw material metals and the same apparatus as in Example 1. The resulting molten alloy was then cast using the same casting equipment as in Example 1. The rotation speed of the cooling roll in casting was 0.87 m / s, the average supply rate of molten alloy supplied to the cooling roll was 30 g / s per 1 cm width, and the average temperature of the cast alloy ingot when leaving the cooling roll was 880°C.

[0145] The cooling rate of this alloy is 700°C / sec from the solidification point of the main phase to 1000°C, 200°C / sec from 1000°C to 850°C, and 10°C / sec from 850°C to 780°C. Thereafter, use Figure 11 The manufacturing apparatus shown in , without using an open-close stage, cooled the alloy to 600° C. or less at a cooling rate of 0.1° C. / sec to manufacture R-T-B type alloy flakes of Example 2. The average thickness of the alloy at this time was 0.45 mm.

[0146] Use electron probe microanalyzer (WDS-EPMA) and field emission-...

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Abstract

An object of the present invention is to provide an R-T-B type alloy (wherein R is at least one element selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Ho, Er, Tm, Yb, and Lu; T is a transition metal that contains 80% by mass or more of Fe; and B is one that contains 50% by mass or more of boron (B) and also contains at least one element of C and N within a range from 0 to less than 50% by mass) that contains at least Dy, as a raw material for a rare earth-based permanent magnet having excellent magnetic characteristics, and the R-T-B type alloy provided in the present invention includes a main phase such as an R2T14B phase for exhibiting magnetic properties; an R-rich phase that is relatively enriched with R compared to the overall alloy compositional ratio; and a Dy-rich region that is formed close to the R-rich phase and relatively enriched with Dy compared to the compositional ratio.

Description

technical field [0001] The invention relates to R-T-B type alloy, fine powder for R-T-B type rare earth permanent magnet and R-T-B type rare earth permanent magnet. In particular, the present invention relates to R-T-B type alloys and fine powders for R-T-B type rare earth permanent magnets, which can provide R-T-B type rare earth permanent magnets with excellent coercive force. Background technique [0002] R-T-B type magnets have been used in hard disks (HD), magnetic resonance imaging (MRI), various types of motors, etc. due to their high performance characteristics. In addition to the improvement in heat resistance of R-T-B magnets, the recent increase in energy-saving requirements has led to an increase in the application rate in engines, including automobile engines. [0003] R-T-B type magnets have Nd, Fe and B as main components, therefore, such magnets are collectively referred to as Nd-Fe-B type or R-T-B type magnets. In R-T-B type magnets, R is mainly Nd partial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B22D11/06B22F1/00B22F9/04C21D6/00C22C33/02H01F1/053H01F1/08
CPCB22F2009/041B22D11/0611B22F2999/00B22F2998/00H01F1/059H01F1/0571C22C33/0278H01F1/058B22F2009/044B22F9/04B22F2201/013
Inventor 中岛健一朗长谷川宽
Owner RESONAC HOLDINGS CORPORATION