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Textured cobalt ferrite film material and preparation method thereof

A technology of cobalt ferrite and texturing, which is applied in the field of textured cobalt ferrite CoxFe3-xO4 film material and preparation, can solve the problems of poor applicability, weak macroscopic performance, high synthesis cost, etc., and achieve the purpose of improving macroscopic performance, The effect of easy access to raw materials and simple process

Inactive Publication Date: 2014-07-02
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are disadvantages such as high synthesis cost and poor applicability
Exploring the preparation process of synthesizing large-sized crystal blocks is the main task in the future Relatively speaking, ceramic materials are easier to prepare, but they are multi-phase materials and their macroscopic properties are relatively weak

Method used

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  • Textured cobalt ferrite film material and preparation method thereof
  • Textured cobalt ferrite film material and preparation method thereof
  • Textured cobalt ferrite film material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Textured Co x Fe 3-x o 4 Membrane material, CoFe when x=1 2 o 4 , and r=8%.

[0026] 1) Slurry configuration

[0027] First weigh 33.75g analytically pure CoO powder and 66.25g analytically pure Fe 2 o 3 Powder, adding organic solvent, dispersant and defoamer, planetary ball milling for 5h, adding binder thereto, and secondary ball milling for 3h to obtain 200g of casting precursor slurry with a solid content of 50wt%;

[0028] 2) Add 6.408g of rod-shaped α-FeOOH particles (length 2μm, diameter 0.5μm), magnetically stir for 0.5h, and stand for 0.5h to remove the bubbles to obtain CoFe 2 o 4 Mix the cast slurry.

[0029] 3) Green body forming and sintering: using the oriented grain growth technology, the CoFe obtained in step (2) 2 o 4 The mixed cast slurry is injected into the cast molding equipment, the thickness of the green body is controlled to be 30 μm, and CoFe is cast 2 o 4 The green body, with the help of a scraper, the rod-shaped α-FeOOH particles ...

Embodiment 2

[0032] Textured Cox Fe 3-x o 4 Membrane material, Co when x=0.7 0.7 Fe 2.3 o 4 .

[0033] 1) Slurry configuration: the iron element of rod-shaped α-FeOOH particles and the final product Co 0.7 Fe 2.3 o 4 The molar ratio of iron element is r=10%.

[0034] First weigh 28.9g of analytically pure CoO powder and 91.1g of analytically pure Fe 2 o 3 The powder was added into an organic solvent and mixed evenly, then added a dispersant and an antifoaming agent, planetary ball milled for 5 hours, and the binder added thereto was ball milled for a second time for 4 hours to obtain 200g of casting precursor slurry with a solid content of 60wt%;

[0035] 2) Add 12g of rod-shaped α-FeOOH particles (length 4μm, diameter 0.8μm), magnetically stir for 0.5h, stand for 0.5h to remove bubbles, and obtain Co 0.7 Fe 2.3 o 4 mixed cast slurry;

[0036] 3) Forming and sintering of the green body: using the oriented grain growth technology, the Co 0.7 Fe 2.3 o 4 The mixed tape casting...

Embodiment 3

[0039] Textured Co x Fe 3-x o 4 Membrane material, Co when x=0.5 0.5 Fe 2.5 o 4 .

[0040] 1) Slurry configuration: according to the iron element of rod-shaped α-FeOOH particles and the final product Co 0.5 Fe 2.5 o 4 The molar ratio of iron element is r=7%.

[0041] First weigh 13.4g of analytically pure CoO powder and 66.6g of analytically pure Fe 2 o 3 Powder, adding organic solvent, dispersant and defoamer, planetary ball milling for 4h, adding binder thereto, secondary ball milling for 3h, to obtain 200g casting precursor slurry, solid content is 40wt%;

[0042] 2) Add 4g of rod-shaped α-FeOOH particles (length 8μm, diameter 1μm), magnetically stir for 0.5h, stand for 0.5h to remove bubbles, and obtain Co 0.7 Fe 2.3 o 4 Mix the cast slurry.

[0043] 3) Forming and sintering of the green body: using the oriented grain growth technology, the Co 0.7 Fe 2.3 o 4 The mixed tape casting slurry is injected into the tape casting equipment, the thickness of the gre...

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Abstract

The invention relates to a method for preparing a textured cobalt ferrite CoxFe3-xO4 film material. The method comprises the following steps: taking rod-shaped alfa-FeOOH particles as the templated grains, adding a casting precursor slurry prepared by taking CoO and Fe2O3 as the raw materials, carrying out stirring and debubbling to obtain a CoxFe3-xO4 mixed casting slurry, preparing a CoxFe3-xO4 blank body by a tape casting, and then carrying out drying, lamination, tabletting, binder removal and sintering to obtain the textured cobalt ferrite CoxFe3-xO4 film after shaping. X is larger than or equal to 0.5 and is less than or equal to 1, and the thickness ranges from 50 mum to 5 mm. The macroscopic properties of the ceramic material are greatly enhanced, the process is simple, and the raw materials are easily obtained.

Description

technical field [0001] The invention belongs to the field of magnetic materials and specifically provides a textured cobalt ferrite Co x Fe 3-x o 4 Membrane materials and preparation methods. Background technique [0002] Ferrite is a ferromagnetic metal oxide, usually containing the element Fe. Ferrite materials are widely used in modern electronics fields such as microwave devices due to their high Curie point, high saturation magnetization, high diffusion anisotropy and good stability. [0003] Among ferrite materials, cobalt ferrite CoFe 2 o 4 It has a typical spinel structure, and the crystal is in the face-centered cubic system at room temperature. 32 O 2- A face-centered cubic lattice composed of close-packed ions, with a tetrahedral interstitial A site and an octahedral interstitial B site. CoFe 2 o 4 Has a high saturation magnetization, the theoretical value at room temperature is 425emu / cm 3 . Moreover, it has the largest magnetostrictive effect and is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/01C04B35/26C04B35/622
Inventor 简刚邵辉胡庆贤芦笙
Owner JIANGSU UNIV OF SCI & TECH
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