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Ferromagnetic particle powder, method for producing same, anisotropic magnet, and bonded magnet

A manufacturing method and ferromagnetic technology, applied in the direction of magnetic objects, inductors/transformers/magnets, magnetic materials, etc., can solve problems such as difficulties and film application limitations

Active Publication Date: 2013-05-22
TOHOKU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the formation of more stable γ′-Fe 4 N or ε-Fe 2～3 N, produces the eutectic of metals such as martinite (α'-Fe) or ferrite (α-Fe), resulting in the separation and production of α"-Fe 16 N 2 Difficulty with single compounds
Although part of the α″-Fe 16 N 2 A single compound is obtained in the form of a thin film, but the application of the thin film in magnetic materials is limited, and it is not suitable for a wider range of applications. It is hoped that it can be obtained in the form of granular powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100]

[0101] Using iron sulfate, sodium hydroxide, and sodium carbonate, the short axis diameter is 17nm, the long axis diameter is 110nm, the aspect ratio is 6.47, and the specific surface area is 123m 2 / g of goethite particles. This was filtered and separated with a suction filter, and sufficiently washed with 150 ml of pure water corresponding to 5 g of the sample. Next, it was dried with a vacuum dryer at 60° C., and only aggregated particles with a diameter of 100 μm or less were sieved with an atomizer and a vibrating sieve. Mixing was performed while permeating the entire goethite particle powder with an aqueous solution of titanyl sulfate corresponding to a Ti raw material having a molar ratio of 0.06% of Fe contained in the goethite particle powder. The temperature was raised to 250° C. at a rate of 3° C. / min in air to dehydrate and decompose the Ti raw material.

[0102]

[0103] 50 g of the sample powder obtained above was put into a hard bowl (a bowl) made...

Embodiment 2

[0107] Same as Example 1, using ferric chloride, sodium hydroxide, sodium carbonate, obtain minor axis diameter 12nm, major axis diameter 276nm, aspect ratio 23.00, specific surface area 101m 2 / g of goethite particles. This was separated by filtration with a suction filter, and repulped using a disperser so that the pure water concentration was 5 g / L. While stirring this, while maintaining the pH at 7.0 with dilute nitric acid, an aqueous gallium nitrate solution having a molar ratio of 20% of Ga relative to Fe in the goethite particles was added dropwise at room temperature. After 5 hours, add dropwise at 40°C for 5 hours to make 5wt%-SiO 2 solution of water glass such that as SiO 2 The Si content in the coated goethite particles is 1wt%. Further, it was separated by filtration with a suction filter, and sufficiently washed with pure water equivalent to 200 ml of pure water for 5 g of the sample. Next, it dried with the vacuum dryer of 55 degreeC. The Si content of the ...

Embodiment 3

[0111] A sample was obtained in the same manner as in Example 2. Wherein, the pH is set to 8.5, and in the slurry of goethite, the molar ratio of Fe in goethite particles is first dropwise the aluminum nitrate aqueous solution of Al raw material that is 0.8%, after that, in conversion of Y, coating 700 wt-ppm of yttrium was further coated on the surface of aluminum so as to be 3000 wt-ppm in Al conversion. Use an atomizing pulverizer and a vibrating sieve to sieve only aggregated particles below 150 μm. The reduction treatment was performed in the same manner as in Example 1. In addition, the sample taken out in this state is α-Fe single phase, and the specific surface area is 88m 2 / g. In addition, nitriding treatment was performed at 142° C. for 15 hours in an ammonia gas flow of 5 L / min. As a result of ICP analysis, the molar ratios of Y and Al to Fe are 689wt-ppm and 1.07wt%, respectively.

[0112] The main phase of the obtained granular powder was measured by XRD and...

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Abstract

The present invention is a ferromagnetic particle powder constituted of 70% or more Fe16N2compound phase according to the Mossbauer spectrum. Specifically, the present invention relates to a ferromagnetic particle powder characterized by containing one or more metal elements (X) selected from Mn, Ni, Ti, Ga, Al, Ge, Zn, Pt, and Si in a molar ratio to Fe of 0.04 - 25% and having BHmax for the ferromagnetic particle powder of 5 MGOe. The present invention further relates to a method for producing the same and an anisotropic magnet and bonded magnet in which this ferromagnetic particle powder is magnetically oriented. This ferromagnetic particle powder can be produced industrially and is a Fe16N2 particle powder that contains a different metal element having a large BHmax.

Description

technical field [0001] The present invention relates to a large BH with more than 5MGOe max Fe 16 N 2 Ferromagnetism (ferromagnetism) particle powder with a compound-like compound as the main phase and a manufacturing method thereof. Also provided is an anisotropic magnet or bonded magnet obtained using the ferromagnetic particle powder. Background technique [0002] Currently, various magnetic materials such as Sr-based ferrite magnetic powder and Nd-Fe-B-based magnetic powder are being put into practical use. However, for the purpose of further improving the properties, improvements are being made and new materials are being searched for. Among them, Fe 16 N 2 etc. Fe-N compounds have attracted much attention. [0003] Among the Fe-N compounds, it is known that α″-Fe 16 N 2 It is a quasi-stable compound that crystallizes when a solid-dissolved nitrogen martensite or ferrite is annealed for a long time. The α″-Fe 16 N 2 The crystal of has a bct structure, and is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/06B22F1/00B22F1/02B22F9/22C01B21/06C22C29/16H01F1/08B22F1/16
CPCC01P2006/42C01P2004/64B82Y30/00C22C29/16H01F7/02C01P2004/62C01B21/0622H01F41/02B22F9/22B22F2999/00C01P2006/12H01F1/083B22F2998/10H01F1/065C01B21/0602Y10T428/2982B22F1/16B22F2201/013B22F1/145B22F2201/016B22F1/142C22C33/0235H01F1/06C01B21/06
Inventor 高桥研小川智之绪方安伸佐久间昭正小林齐也C·R·波尔瓦特加拉吉小原香
Owner TOHOKU UNIV
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