Magnetic material and method for producing same

A technology of magnetic materials and manufacturing methods, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problem of high resistivity

Active Publication Date: 2020-07-07
NAT INST OF ADVANCED IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the object is to provide a new magnetic material with high magnetic stability and a manufacturing method thereof, which has a higher resistivity than conventional metal-based magnetic materials and can solve the above-mentioned problems such as eddy current loss.

Method used

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  • Magnetic material and method for producing same
  • Magnetic material and method for producing same
  • Magnetic material and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example 1

[0297] Additionally prepared CoCl 2 ·6H 2 O (cobalt(II) chloride hexahydrate) and FeCl 2 4H 2 O (iron(II) chloride tetrahydrate) aqueous solution, they are mixed, will be adjusted to 50.3mM CoCl 2 and FeCl 2 The mixed aqueous solution is put into the reactor to make the reaction field liquid. In addition, the composition of cobalt contained in the above-mentioned mixed aqueous solution, that is, the composition of feed cobalt was set to 4 atomic %. Then, while vigorously stirring in the atmosphere, 660 mM potassium hydroxide aqueous solution (pH adjustment solution) was added dropwise to adjust the pH of the system in the range of 4.57 to 10.1. solution (the composition of cobalt in the reaction solution (feeding cobalt composition) is 4 atomic %) into the FeCl of 168mM 2 and CoCl 2The mixed aqueous solution was allowed to react for 15 minutes, then the dropping of the pH adjusting solution and the reaction solution was stopped, and the stirring operation was continued ...

Embodiment 2～10、 comparative example 5～13

[0314] In addition to changing the feed Co composition to 1 atomic % (Comparative Example 5), 2 atomic % (Comparative Example 6), 8 atomic % (Comparative Example 7), 10 atomic % (Comparative Example 8), 15 atomic % (Comparative Example 9), 20 atomic % (Comparative Example 10), 33 atomic % (Comparative Example 11), 50 atomic % (Comparative Example 12) and 75 atomic % (Comparative Example 13), prepared by the same method as Comparative Example 1 Ferrite nano powder. The nanopowder was analyzed by X-ray diffraction method. As a result, it can be seen that the cubic Co-ferrite phase is the main phase, and the rhombohedral Co-hematite phase is contained as an impurity phase. Therefore, the ccs-(Fe, Co) phase was not contained in this powder, and it was used as the powder of Comparative Examples 5-13, and the magnetic characteristics etc. are shown in Table 1. The feed amounts of these are consistent with the Co content obtained by XRF to the % point.

[0315] These ferrite nanopo...

Embodiment 11

[0320] Additional preparation of MnCl 2 4H 2 O (manganese(II) chloride tetrahydrate), CoCl 2 ·6H 2 O (cobalt(II) chloride hexahydrate) and FeCl 2 4H 2 O (iron(II) chloride tetrahydrate) aqueous solution, they are mixed, will be adjusted to 50.3mM MnCl 2 、CoCl 2 and FeCl 2 The mixed aqueous solution was put into the reactor to make the reaction field liquid. It should be noted that the compositions of cobalt and manganese contained in the above-mentioned mixed aqueous solution, that is, the feed cobalt composition and the feed manganese composition were set to be 4 atomic % and 0.1 atomic %, respectively. Then, while vigorously stirring in the atmosphere, 660 mM potassium hydroxide aqueous solution (pH adjustment solution) was added dropwise, and the pH of the adjustment system was slowly shifted from the acid side to the alkaline side in the range of 4.69 or more and 9.32 or less. 168mM FeCl was added dropwise 2 and CoCl 2 The mixed aqueous solution of the above was ...

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Abstract

Provided are: a novel magnetic material having high magnetic stability, in particular, having an extremely high saturation magnetization; and a method for producing the same, wherein the magnetic material, due to having a higher saturation magnetization than ferrite magnetic materials and a higher electrical resistivity than existing metallic magnetic materials, resolves problems such as eddy current loss. According to the present invention, Co-ferrite nanoparticles obtained by wet synthesis are reduced in hydrogen and subjected to grain growth, and bcc- or fcc-(Fe, Co) phases and Co-enrichedphases are nano-dispersed using phase separation via a disproportionation reaction to prepare a magnetic material powder. In addition, the magnetic material powder is sintered into a solid magnetic material.

Description

technical field [0001] The present invention relates to a magnetic material exhibiting soft magnetism or semi-hard magnetism, particularly a magnetic material exhibiting soft magnetism, and a method for producing the same. Background technique [0002] Global environmental issues such as global warming and resource depletion are becoming more serious, and social demands for energy saving and resource conservation of various electronic and electrical equipment are increasing. Under such circumstances, it is necessary to further improve the performance of soft magnetic materials used in drive units typified by motors, voltage conversion devices for transformers, and the like. In addition, in order to solve the miniaturization and multi-function of various information and communication equipment, high-speed calculation processing speed, high-density recording capacity, environmental sanitation maintenance of infrastructure, increasingly complex logistics system, and various sec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/00B22F9/22C22C19/07C22C38/00H01F1/047H01F1/09H01F1/147H01F1/33
CPCB22F1/00B22F3/00B22F9/22C22C19/07C22C38/00C22C2202/02C22C33/02B22F2998/10B22F2999/00C22C1/0433H01F1/147C22C38/10C22C38/02C22C38/04B22F3/02B22F3/10B22F2201/013H01F1/065H01F1/14741H01F1/14775H01F1/15316H01F1/33
Inventor 山本真平今冈伸嘉尾崎公洋
Owner NAT INST OF ADVANCED IND SCI & TECH
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