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Magnetic nano composite film and its method for preparing sol-gel

A composite film and sol-gel technology, applied in the fields of magnetic nanocomposite film and sol-gel preparation, nanocomposite film and preparation thereof, can solve the problems of easy occurrence of micro-cracks, complicated operation, high cost, etc. Wide range, wide application prospect, high magnetic performance effect

Inactive Publication Date: 2006-08-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two main production techniques of barium ferrite film: one is to mix ferrite powder with polymer such as resin and then solidify it into a thin film with a thickness of millimeter [Magnetic Materials and Devices, 27 (1996) 19~ 23], large volume, and low temperature; the other is the sputtering method [Functional Materials, 25 (1994) 172-175] and laser deposition method [Vacuum Science and Technology, 23 (2003) 195-199] Make a single ferrite film, but the cost is expensive and the operation is complicated
Such films made by the sol-gel method have relatively large stress, are prone to microcracks, and the effect is not satisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Add 1.1ml of butyl titanate to 5ml of absolute ethanol, stir for 30 minutes, add 0.25ml of diethanolamine and 0.06ml of deionized water, continue stirring for 120 minutes, and let it stand for 120 minutes to obtain a titanium dioxide sol.

[0019] 2. Add 0.218gBa(NO 3 ) 2 and 4.04gFe(NO 3 ) 3 9H 2 O was added to 10ml of ethylene glycol at 60°C, and after it was completely dissolved, 2.218g of citric acid was added. Then ethylenediamine was added dropwise to make the pH of the solution 7.0 to obtain a barium ferrite precursor sol.

[0020] 3. Aspirate 0.6 ml from the above-mentioned barium ferrite precursor sol and drop it into the titanium dioxide sol, and stir thoroughly to obtain a mixed sol with a mass ratio of barium ferrite and titanium dioxide of 1:5.

[0021] 4. Coating the mixed sol on the quartz glass sheet by the rotation method, the rotation speed is 3000rmp, and the time is 15 seconds.

[0022] 5. Put the film in a 60°C drying oven to dry for 30 min...

Embodiment 2

[0025] 1. Add 0.87ml of propyl titanate to 5ml of absolute ethanol, stir for 30 minutes, add 0.23ml of diethanolamine and 0.06ml of deionized water, continue stirring for 120 minutes, and let it stand for 120 minutes to obtain titanium dioxide sol.

[0026] 2. Add 0.218gBa(NO 3 ) 2 and 4.04gFe(NO 3 ) 3 9H 2 O was added to 10ml of ethylene glycol at 60°C, and after it was completely dissolved, 2.218g of citric acid was added. Then ethylenediamine was added dropwise to make the pH of the solution 7.0 to obtain a barium ferrite precursor sol.

[0027] 3. Aspirate 1.2ml from the above-mentioned barium ferrite precursor sol and drop it into the titanium dioxide sol, and stir thoroughly to obtain a mixed sol with a mass ratio of barium ferrite and titanium dioxide of 2:5.

[0028] 4. Coating the mixed sol on the quartz glass sheet by the rotation method, the rotation speed is 3000rmp, and the time is 15 seconds.

[0029] 5. Put the film in a 60°C drying oven to dry for 30 minu...

Embodiment 3

[0032] 1. Add 0.65ml of ethyl titanate to 5ml of absolute ethanol, stir for 30 minutes, add 0.22ml of diethanolamine and 0.06ml of deionized water, continue stirring for 120 minutes, and let stand for 120 minutes to obtain a titanium dioxide sol.

[0033] 2. Add 0.218gBa(NO 3 ) 2 and 4.04gFe(NO 3 ) 3 9H 2 O was added to 10ml of ethylene glycol at 60°C, and after it was completely dissolved, 2.377g of glycine was added. Then ethylenediamine was added dropwise to make the pH of the solution 7.0 to obtain a barium ferrite precursor sol.

[0034] 3. Suck 1.8 ml from the above-mentioned barium ferrite precursor sol and drop it into the titanium dioxide sol, and stir thoroughly to obtain a mixed sol with a mass ratio of barium ferrite and titanium dioxide of 3:5.

[0035] 4. Coating the mixed sol on the quartz glass sheet by the rotation method, the rotation speed is 3000rmp, and the time is 15 seconds.

[0036] 5. Put the film in a 60°C drying oven to dry for 30 minutes.

[...

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Abstract

The invention is a nano complex film and its sol-gel preparing method, firstly making a TiO2 sol and a barium ferrite precursor sol, respectively, then mixing them to make stable mixed sols in different mass proportions, adopting a rotating method to coat a substrate (like a quartz glass plate), making drying and thermal treatment to obtain a microcrack-free complex film. It belongs to a nano complex film and a crystal particle size less than 100 nm; it also belongs to an inorganic film and has a wide range of use temperature. It has higher magnetic property and has a wide application prospect in the fields of magnetic recording, electromagnetic screening, wave absorption coating, etc.

Description

technical field [0001] The invention relates to a nanocomposite film and its preparation method, in particular to a magnetic nanocomposite film and its sol-gel preparation method. The prepared composite film can be applied to magnetic recording, electromagnetic shielding and wave-absorbing coatings, etc., and belongs to Technical field of functional materials. Background technique [0002] With the development of electronic technology, the application of electronic facilities is becoming more and more common, and almost every corner is filled with electromagnetic waves. The impact of electromagnetic radiation on normal production, life and human health can no longer be ignored. Effective shielding and absorption of electromagnetic radiation has become an urgent need. Thin-film magnetic materials have become the first choice for research and use because of their small thickness, light weight, and convenient application. Barium ferrite is an excellent magnetic material with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/14B82B3/00
Inventor 顾明元邱建勋
Owner SHANGHAI JIAO TONG UNIV
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