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RH diffusion source, and method for producing R-T-B-based sintered magnet using same

一种R-T-B、扩散源的技术，应用在电感/变压器/磁铁制造、磁性物体、磁性材料等方向，能够解决磁通密度降低等问题，达到HcJ提高的效果

Active Publication Date: 2014-02-19
PROTERIAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the R-T-B type sintered magnet, as R, when the light rare-earth element RL is replaced by the heavy rare-earth element RH, the coercive force (hereinafter referred to as H cJ ) increase, on the other hand, there is a residual magnetic flux density (hereinafter referred to as B r ) reduces the problem

Method used

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  • RH diffusion source, and method for producing R-T-B-based sintered magnet using same
  • RH diffusion source, and method for producing R-T-B-based sintered magnet using same
  • RH diffusion source, and method for producing R-T-B-based sintered magnet using same

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1）

[0094] (Experimental example 1) (Efficiency of RH diffusion treatment)

[0095] First, an R-TB-type sintered magnet with a composition ratio of Nd=28.5, Pr=1.0, Dy=0.5, B=1.0, Co=0.9, Al=0.1, Cu=0.1, and the remainder=Fe (mass%) is produced. . By machining this, a cubic R-T-B type sintered magnet of 7.4 mm×7.4 mm×7.4 mm was obtained. When the magnetic properties of the produced R-T-B type sintered magnets are measured using a B-H tracer, the properties after heat treatment (500°C x 1 hour), H cJ 960kA / m, B r It is 1.41T. This value was used as the reference|standard of the characteristic evaluation of each experiment example below.

[0096] The RH diffusion source is produced as follows: According to the specified composition described in Table 1, Nd, Dy, Fe are weighed, and after melting in a high-frequency melting furnace, the molten metal is mixed with a copper tube made of copper that rotates at a roll surface speed of 2 m / s. The water-cooled roll contacts to form a q...

experiment example 2）

[0107] (Experimental example 2) (with or without welding, temperature of RH diffusion)

[0108] According to the conditions described in Table 3, R-TB type sintered magnets were produced, and the conditions and methods not described in Table 3 were the same as in Experimental Example 1.

[0109] Table 3 shows the results of the RH diffusion process with or without welding at different temperatures (600°C, 700°C, 800°C, 850°C, 900°C, 1000°C, 1020°C).

[0110] Samples 9 to 17 are samples using the RH diffusion source of the present invention, and samples 18 to 30 are comparative examples.

[0111] In Table 3, use "ΔH cJ ” represents the H after the RH diffusion process cJ Increment, use "ΔB r "Indicates B after the RH diffusion process r increments. A negative value indicates that the magnetic properties of the R-TB-based sintered magnet that has not been subjected to the RH diffusion treatment are lowered. In "Whether there is welding or not", "Yes" indicates that the RH ...

experiment example 3）

[0125] (Experimental example 3) (Influence of RH diffusion treatment time)

[0126] Except for the conditions described in Table 5, an R-TB type sintered magnet was produced under the same conditions and method as in Experimental Example 1.

[0127] Regarding the influence of the RH diffusion treatment time, when the RH diffusion treatment is performed by changing the RH diffusion treatment time as shown in Table 5, in the RH diffusion process at 900°C, after 4 hours, ΔH cJ No major changes (samples 33 to 36). Sample 31 to Sample 36 of Table 5 B r 、H cJ The value of is shown in Table 6.

[0128] [table 5]

[0129]

[0130] [Table 6]

[0131] sample

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Abstract

Provided is a method for producing an R-T-B-based sintered magnet by diffusing an heavy rare earth element RH from the surface of an R-T-B-based sintered magnet body into the inside of the sintered magnet body with high efficiency. This method for producing an R-T-B-based sintered magnet comprises: a step of preparing an R-T-B-based sintered magnet body (wherein R represents a rare earth element; and T represents a transition metal element mainly comprising Fe); a step of preparing an RH diffusion source that is an alloy comprising 0.2 to 18 mass% inclusive of a light rare earth element RL (which comprises Nd and / or Pr), 40 to 70 mass% inclusive of Fe and a reminder made up by a heavy rare earth element RH (which comprises Dy and / or Tb) wherein the ratio of the heavy rare earth element RH to Fe (i.e., RH:Fe) is 3:2 to 3:7 by mass; and an RH diffusion step of introducing the R-T-B-based sintered magnet body and the RH diffusion source into a treatment chamber in a relatively movable and approachable or contactable manner to each other and heating the R-T-B-based sintered magnet body and the RH diffusion source at a temperature of 700 to 1000ºC inclusive while moving the R-T-B-based sintered magnet body and the RH diffusion source in the treatment chamber continuously or intermittently.

Description

technical field [0001] The present invention relates to having R 2 T 14 A method for manufacturing R-T-B type sintered magnets (R is a rare earth element, T is a transition metal element mainly composed of Fe) with a B-type compound as the main phase. Background technique [0002] with R 2 T 14 R-TB-type sintered magnets with B-type compounds as the main phase are known as the highest performance magnets among permanent magnets, and are used in various electric motors such as motors for hybrid vehicles and home appliances. [0003] The coercive force of R-T-B sintered magnets decreases at high temperature, so irreversible thermal demagnetization will occur. In order to avoid irreversible thermal demagnetization, when used in a motor or the like, it is required to maintain a high coercive force even at high temperatures. [0004] Known R-T-B type sintered magnets, when the R 2 T 14 When a part of R in the B-type compound phase is replaced with the heavy rare earth meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B22F3/00B22F3/24C22C33/02H01F41/02
CPCH01F41/0293C22C2202/02C22C33/02C22C28/00H01F1/0577H01F41/005
Inventor 国吉太
Owner PROTERIAL LTD
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