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Method for preparing nanocrystalline soft magnetic material employing microwave sintering

A nanocrystalline soft magnetic and microwave sintering technology, applied in the field of magnetic materials, can solve the problems of high cost and high energy consumption, and achieve the effects of simple operation, uniform powder particle size and energy saving

Inactive Publication Date: 2014-04-16
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing nanocrystalline soft magnetic materials by microwave sintering, which solves the problems of high cost and large energy consumption in the existing methods for preparing nanocrystalline soft magnetic materials

Method used

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  • Method for preparing nanocrystalline soft magnetic material employing microwave sintering
  • Method for preparing nanocrystalline soft magnetic material employing microwave sintering
  • Method for preparing nanocrystalline soft magnetic material employing microwave sintering

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preparation example Construction

[0024] Preparation of manganese-zinc ferrite powder or nickel-zinc ferrite powder: add 0.25mol / L manganese nitrate or nickel nitrate, 1mol / L ferric nitrate, 0.25mol / L zinc nitrate solution into a beaker and mix evenly, and mix well in a magnetic stirrer After heating to 40°C, slowly add 1.5mol / L citric acid solution, then adjust the pH value to 5 with ammonia water, continue stirring for 30 minutes, and then heat and stir at 80°C for 6 hours to obtain a viscous colloid;

[0025] After the viscous colloid obtained above was left to stand for 24 hours, the clear liquid above the viscous colloid was filtered off, and the remaining viscous colloid was dried in a blast drying oven at 120°C for 1 hour, and then magnetic stirring was continued until the magnetic stirrer could no longer continue. Stir until it is stirred, then place it in a blast drying oven at 120°C and heat it for 6 hours, dry the moisture and complex compounds, and heat it at 220°C for 2 hours to decompose citric ac...

Embodiment 1

[0037] Microwave sintering of soft magnetic Mn-Zn ferrite with a mass of 100g "H type" (outer diameter 20mm, inner diameter 15mm, height 10mm), Fe in Mn-Zn ferrite 2 o 3 : MnO: ZnO = 53.5: 36.5: 10 (numbers represent mole percentages).

[0038] Step 1, according to Fe in Mn-Zn ferrite 2 o 3 : MnO: ZnO=53.5:36.5:10, calculated Fe 2 o 3 , MnO, ZnO mass ratio is: 71.5: 21.6: 6.9, and the element mass ratio of Fe, Mn, Zn is further obtained: 50.05: 16.63: 5.52, the mass of Mn-Zn ferrite is 100g, then calculate the Quality, i.e. iron nitrate (Fe(NO 3 ) 3 9H 2 O), manganese nitrate (Mn(NO 3 ) 2 ·6H 2 O), zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) The masses are respectively: 361.1g, 54.1g, 25.2g, and then respectively configured into 1mol / L ferric nitrate solution, 0.25mol / L manganese nitrate solution and 0.25mol / L zinc nitrate solution;

[0039] Add 0.25mol / L manganese nitrate, 1mol / L ferric nitrate, 0.25mol / L zinc nitrate solution into the beaker and mix evenly. After heatin...

Embodiment 2

[0046] Cylindrical (dimensions ) Microwave sintering of pure metallic ferromagnetic materials.

[0047] Step 1. Mechanically grind the raw material pure iron powder, and grind according to different times. The specific requirements for ball milling are: the speed of rotation is 750 rpm, and the time of ball milling is: 120h, 140h, and 160h. Finally, iron powders with different particle sizes are obtained. Respectively: 80nm, 70nm, 60nm;

[0048] Step 2, place the iron powder ground in step 1 in a vacuum environment at 150°C (vacuum degree not greater than 10 -2 Pa) Annealing for 3 hours to eliminate work hardening and prepare for subsequent molding;

[0049] In step 3, iron powders of different particle sizes are pressed according to the requirements of the sample, and the specifications of the abrasive tools are: , the pressing pressure is 500MPa, the pressing time is 6min, and the holding time is 8min;

[0050] Step 4, put the pressed compact obtained in step 3 into a ...

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Abstract

The invention discloses a method for preparing a nanocrystalline soft magnetic material employing microwave sintering. The Mn-Zn ferrite powder or nickel-zinc ferrite powder which is prepared from pure iron powder by a sol-gel method is pressed and molded after by annealed, and then subjected to surface treatment after microwave sintering, so as to obtain the nanocrystalline soft magnetic material. By adopting the method for preparing the nanocrystalline soft magnetic material employing microwave sintering, which is disclosed by the invention, the mean grain size of the obtained nanocrystalline soft magnetic material achieves nanoscale by adopting microwave sintering, the prepared nanocrystalline soft magnetic material is uniform in powder particle, small in crystal particle, excellent in magnetic property, safe and environment-friendly, the sintering time is shortened, and energy sources are saved. The method disclosed by the invention is simple and convenient to operate, simple in preparation technology, and low in fabrication and sintering costs.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and relates to a method for preparing nanocrystalline soft magnetic materials by microwave sintering. Background technique [0002] Soft magnetic materials refer to ferromagnetic materials with small remanence and coercive force, such as silicon steel sheet, pure iron, etc. It is characterized by easy magnetization, easy demagnetization and narrow hysteresis loop. Soft magnetic materials are often used to make iron cores for electrical appliances such as motors, transformers, and electromagnets. The characteristics of soft ferrite are: low saturation magnetic flux density, low magnetic permeability, low Curie temperature, low medium and high frequency loss, and low cost. The first three lows are its disadvantages, which limit its scope of use. The latter two lows are its advantages, which are conducive to entering the high-frequency market. With the development of light, thin, shor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C33/02H01F1/22
Inventor 陈文革周弦
Owner XIAN UNIV OF TECH
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