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Ferrimagnetism fluid

A technology of magnetic fluid and magnetic ferrite, applied in magnetic liquid, inductor/transformer/magnet manufacturing, electrical components, etc., can solve the problems of magnetic condensation, large surface energy, uneven particle size, etc.

Inactive Publication Date: 2010-12-08
巨东英 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] Chinese patent CN1365124 "Ferrite Nano Magnetic Liquid" provides a method for preparing ferrite magnetic liquid, but the microparticles prepared by this method have large surface energy during the preparation process, resulting in particle growth and uneven particle size and magnetic condensation
As a result, particles precipitate in the solvent causing phase separation, resulting in reduced or complete loss of magnetic properties

Method used

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  • Ferrimagnetism fluid
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Experimental program
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Embodiment 1

[0054] Preparation of Magnetic Ferrite Particles

[0055] Prepare 150 ml of a mixed solution of 0.125 mol / l ferrous chloride reagent and 0.25 mol / l ferric chloride reagent, and prepare an appropriate amount of 1 mol / l NaOH solution. Add the deionized water of 100ml in the 500ml beaker, drip mixed solution and sodium hydroxide solution simultaneously with the speed of 5ml / min, can control the particle size of magnetic ferrite particle by the pH value of control solution, utilize transmission electron microscope ( TEM), powder refraction X-ray (XRD) and the use of vibratory magnetic susceptibility measuring device (VSM) to evaluate it, as shown in Table 1. The Curie temperature of the synthesized magnetic nano-powder at pH 7 was determined to be 472° C. by using a high-temperature magnetic measuring device.

[0056] Table 1

[0057] PH value

3

5

6

7

9

1 1

Particle size (nm)

3.2

4.8

6.1

7.9...

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PUM

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Abstract

The method includes following steps: using chemical coprecipitation method to prepare mixed liquor of ammonia (or sodium hydroxide), bivalent iron salt (manganese, nickel, cobalt etc.) and tervalent iron salt; dropping the mixed liquor to ion exchange water, and keeping pH of solution at 7; mixing round the solution to generate suspending liquid of ferrite; using ultrasonic to coat a layer of surface active agent on surfaces of fine grains evenly; finally, using ultrasonic to disperse fine grains on solvent evenly.

Description

technical field [0001] The invention relates to a manufacturing method of magnetic fluid, in particular to a ferrite suitable for application fields such as vacuum, cooling, separation, lubrication, metering, magnetic sensor, damping and devibration, magnetic ink, magnetic fluid engine, compressor, etc. Manufacturing method of magnetic liquid. Background technique [0002] Magnetic fluid is a colloidal material with superparamagnetic properties, which has both the magnetism of solid magnetic materials and the flow properties of liquids. Since S.Papel in the United States developed this liquid material in 1965, it has a history of 30 years. The main preparation method is to add magnetic microparticles coated with surfactants into the mother liquor to form a stable colloidal system. The basic condition for the preparation of magnetic fluid is that the magnetic particles are small enough so that they exhibit chaotic Brownian motion in the base fluid, so as to ensure long-term...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/44
Inventor 巨东英边培
Owner 巨东英