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Preparation method of 2:17 type rare earth-iron-nitrogen composite magnetic material for high frequency use

A composite magnetic material and technology of magnetic materials, which are applied in the field of preparation of 2:17 type rare earth-iron-nitrogen composite magnetic materials for high frequency, can solve the problems of electromagnetic wave absorption and shielding failure, large eddy current loss, etc. Morphology rules, raw material cost reduction, and the effect of improving nitrogen absorption efficiency

Active Publication Date: 2019-07-23
LANZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the resistivity of this type of material is larger than that of Fe-based metal alloy materials, when used at high frequencies, the eddy current loss is still large, which makes the electromagnetic wave absorption and shielding effect invalid.

Method used

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  • Preparation method of 2:17 type rare earth-iron-nitrogen composite magnetic material for high frequency use
  • Preparation method of 2:17 type rare earth-iron-nitrogen composite magnetic material for high frequency use
  • Preparation method of 2:17 type rare earth-iron-nitrogen composite magnetic material for high frequency use

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preparation example Construction

[0041] A method for preparing a 2:17 type rare earth-iron-nitrogen composite magnetic material for high frequency, comprising the following steps:

[0042] 1) Preparation of 2:17 type rare earth-iron-nitrogen magnetic powder

[0043] S11: Use rare earth oxides, carbonyl iron powder and / or iron oxides, and reducing agents as raw materials to perform a reduction diffusion reaction to obtain a 2:17 type rare earth-iron magnetic material Re 2 Fe 17 ; Wherein, R is a rare earth element;

[0044] S12: performing hydrogen absorption and dehydrogenation treatment on the 2:17 type rare earth-iron magnetic material obtained in S11;

[0045] S13: The product obtained in S12 is subjected to a nitrogen absorption reaction, washed with water, dried, and ball milled to obtain a 2:17 type rare earth-iron-nitrogen magnetic powder;

[0046] 2) Preparation of 2:17 type rare earth-iron-nitrogen composite magnetic materials for high frequency

[0047] S21: Mix 2:17 type rare earth-iron-nitroge...

Embodiment

[0083] 1. Preparation of 2:17 type rare earth-iron-nitrogen magnetic powder

[0084] Nd with a purity of 99.9% is selected 2 o 3 Carbonyl iron powder (average particle size is 5 μ m) of powder and purity 98.6%, according to equation (1) calculate the stoichiometric dose of each reactant required, Nd 2 o 3 The added mass is over 30% stoichiometric, the metal Ca particle size is 3-5mm, and the added amount is based on Nd 2 o 3 The actual amount added is metered, and the chemical dosage over metered is 50%. The reduction-diffusion reaction was carried out at 1160° C. for 4 hours under the protection of argon. Then draw a high vacuum to 10 -5 mbar, into H 2 Gas, heat up to 250°C and keep it warm for 2 hours to absorb hydrogen; switch to Ar gas, heat up to 400°C, stop flowing Ar, and vacuum for 40 minutes to carry out dehydrogenation. Stop vacuuming, feed N 2 Gas (flow rate is 500sccm) and H 2 Gas (flow rate: 50 sccm) mixed gas, the temperature was raised to 480° C., and ...

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Abstract

The invention discloses a preparation method of 2:17 type rare earth-iron-nitrogen composite magnetic material for high frequency use. The preparation method comprises the following steps: 1) carryingout reduction-diffusion reaction by using rare earth oxide, carbonyl iron powder and / or iron oxide and reductant as raw materials; performing hydrogen absorption and dehydrogenation; and carrying outnitrogen absorption reaction to obtain 2:17 type rare earth-iron-nitrogen magnetic powder; 2) mixing the2:17 type rare earth-iron-nitrogen magnetic powder, a self-curing resin, an auxiliary agent anda solvent to prepare magnetic slurry; casting the magnetic slurry into a composite magnetic sheet; and pressing and curing the composite magnetic sheet by adopting a flat vulcanizer to obtain the product. The 2:17 type rare earth-iron-nitrogen composite magnetic material is suitable for high-frequency electromagnetic wave absorption and shielding materials such as electronic devices and electronic equipment with functions of 1 GHz and above, and has the characteristics of high permeability and low eddy current loss.

Description

technical field [0001] The invention relates to a magnetic material, in particular to a preparation method of a 2:17 type rare earth-iron-nitrogen composite magnetic material for high frequency. Background technique [0002] The use of electronic products has brought great convenience to our lives, enriched our lives, and improved our quality of life. It can be said that electronic products have become an integral part of our lives. However, when electronic products are used, electromagnetic radiation will be generated; electromagnetic radiation has brought great environmental pollution, and will cause non-negligible damage to human body and electronic equipment. It has become another urgent problem to be solved after noise, air and water pollution. The issue has received widespread attention from all over the world. With the rapid development of information science and technology, various information and communication equipment and machines are developing towards miniatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147B22F1/00B22F3/02B22F9/20C22C38/00C04B26/14C04B26/12C04B26/06C04B26/18C04B14/34
CPCH01F1/147B22F3/02B22F9/20C22C38/005C22C38/001C04B26/14C04B26/122C04B26/06C04B26/18C04B14/34C04B2111/00422B22F1/102B22F1/107C04B24/008C04B24/121C04B24/42C04B24/2682
Inventor 史慧刚薛德胜乔亮杨正
Owner LANZHOU UNIVERSITY
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