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Compound for rare earth element based bonded magnet and bonded magnet using the same

A technology of bonded magnets and mixtures, which is applied in the directions of magnetic objects, magnetic materials, nano-magnetism, etc., and can solve the problems of not being able to obtain bonded magnets for hard disk drives.

Inactive Publication Date: 2007-03-07
SUMITOMO SPECIAL METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, in the powder obtained by pulverizing the quenched alloy thus obtained, most of the particles have an aspect ratio of less than 0.3.
For example, bonded magnets for hard disk drive (HDD) motors are not available

Method used

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  • Compound for rare earth element based bonded magnet and bonded magnet using the same
  • Compound for rare earth element based bonded magnet and bonded magnet using the same
  • Compound for rare earth element based bonded magnet and bonded magnet using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0258] (Examples 1-3, Comparative Example 1)

[0259]

[0260] Put 5 kg of raw materials in accordance with the alloy composition of Nd: 8.9 atomic%, B: 12.6 atomic%, Ti: 3.0 atomic%, C: 1.4 atomic%, Nb: 1.0 atomic%, and the rest is Fe into the crucible, and then keep it under 50kPa The molten alloy was obtained by high-frequency induction heating in an argon atmosphere.

[0261] Quench alloys are produced from molten alloys produced using strip casting. Specifically, the crucible was tilted and fed through a chute directly onto a pure copper cooling roll (250 mm in diameter) rotating at a roll surface peripheral speed of 14 m / s to quench the molten alloy. When the melt is supplied to the roller, the melt is divided into two streams on the chute. At this time, the supply speed of the melt and the inclination angle of the crucible are adjusted so that each melt reaches 1.3kg / min.

[0262] The thickness of 100 cast pieces of the obtained quenched alloy was measured with a mi...

Embodiment 4、 comparative example 2 and 3

[0285]

[0286] Only use the titanium nanocomposite magnetic powder (true density 7.5g / cm2) used in the above-mentioned embodiments 1-3 3 , particle size distribution with reference to table 7) the mixture of manufacture embodiment 4, use commercially available MQP-B powder (manufactured by MQI company, true density 7.6g / cm3 respectively) 3 ) and commercially available MQP-O powder (manufactured by MQI company, real density 7.5g / cm 3 ) The mixtures of Comparative Example 2 and Comparative Example 3 were produced.

[0287] Specifically, each magnetic powder was mixed with epoxy resin (true density 1.2g / cm 3 , diluted with methyl ethyl ketone) were mixed, and then kneaded while volatilizing the methyl ethyl ketone in an argon atmosphere to obtain the mixture for rare earth bonded magnets of Example 4 and Comparative Examples 2 and 3. From the true density of each mixture (6.9g / cm 3 ) to obtain the volume fraction of the rare earth alloy powder in the mixture, it was 90% in ...

Embodiment 5

[0293] (embodiment 5, comparative example 4)

[0294]

[0295] Put 5 kg of raw materials in accordance with the alloy composition of Nd: 8.5 atomic %, B: 11.0 atomic %, Ti: 2.5 atomic %, C: 1.0 atomic %, Co: 2.0 atomic %, and the rest is Fe into the crucible, and then keep it under 50kPa In the argon atmosphere, the molten alloy was obtained by high-frequency induction heating.

[0296] Quench alloys are produced from molten alloys produced using strip casting. Specifically, the crucible was tilted and fed through a chute directly onto a pure copper cooling roll (250 mm in diameter) rotating at a roll surface peripheral speed of 15 m / s to quench the molten alloy. When the melt is supplied to the roller, the melt is divided into two streams on the chute. At this time, the supply speed of the melt and the inclination angle of the crucible are adjusted so that each melt reaches 1.3kg / min.

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Abstract

A compound for a rare earth element based bonded magnet containing a rare earth element powder and a binding agent, characterized in that the rare earth element powder comprises, in an amount of 2 mass % or more, Ti-containing nanocomposite magnet powdery particles which have a composition represented by the empirical formula: Fe1-mTm100-x-y-z QxR yMz wherein T is at least one element selected from the group consisting of Co and Ni, Q is at least one element being selected from the group consisting of B and C and including B, R is at least one rare earth element not including La nor Ce, M is at least one metal element being selected from the group consisting of Ti, Zr and Hf and including Ti, and x, y, z and m respectively satisfy 10 < x <= 20 atomic %, 6 <= y < 10 atomic %, 0.1 <= z <= 12 atomic % and 0 <= m <= 0.5, and have a structure containing two or more types of ferromagnetic crystal phase, wherein a hard magnetic phase has an average crystal grain diameter of 10 nm to 200 nm, a soft magnetic phase has an average crystal grain diameter of 1 nm to 100 nm, and the average crystal grain diameter of the soft magnetic phase is less than that of the hard magnetic phase.

Description

technical field [0001] The present invention relates to a mixture for a rare earth bonded magnet and a rare earth bonded magnet using the mixture. Background technique [0002] At present, bonded magnets are used in various electric machines such as motors, actuators, speakers, meters, and zoom rings. The so-called bonded magnet is a magnet obtained by mixing alloy powder for magnets (magnet powder) and a binder (resin or low-melting point metal) and molding and solidifying. [0003] Conventionally, as magnet powder for bonded magnets, Fe—R—B based magnet powder sold by Magnequench International Corporation (hereinafter abbreviated as “MQI Corporation”), ie, so-called MQ powder, has been widely used. MQ powder is generally composed of Fe 100-a-b B a R b (Fe is iron, B is boron, R is at least one rare earth element selected from Pr, Nd, Dy and Tb), and a and b in the composition formula satisfy 1 atomic %≤a≤6 atoms % and 10 atomic % ≤ b ≤ 25 atomic %, a rare earth alloy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/04H01F1/08B22F1/00C22C38/00B22F9/04B22F3/00C22C1/04C22C38/14H01F1/053H01F1/057
CPCC22C38/14B22F2998/10H01F1/0579C22C38/005B82Y25/00C22C1/0441H01F1/0578B22F9/008B22F9/04B22F9/007H01F1/057
Inventor 西内武司金清裕和广泽哲三次敏夫
Owner SUMITOMO SPECIAL METAL CO LTD