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Preparation method of ferro-electricity/ferro-magnetism multiple phase ceramic

A composite ceramic and ferromagnetic technology, which is applied in the field of ferroelectric/ferromagnetic composite ceramics, can solve the problems of small ferromagnetism, performance degradation, and no theoretical research on percolation, and achieve high permeability, high dielectric constant, magnetic The effect of high electric coefficient

Inactive Publication Date: 2008-07-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under normal circumstances, considering the limitation of the law of recombination and the interaction between different phases of multiphase materials, after the two phases are recombined, their respective properties will decrease, and will decrease rapidly as the content of the corresponding phase decreases, that is, the more The more ferroelectric phase, the less ferromagnetism, and vice versa
Therefore, ordinary multiphase materials usually cannot guarantee both high dielectric properties and high ferromagnetism, and it is impossible to use a single material directly for components to achieve a wider sense of integration.
No one has studied the application of percolation theory in ferroelectric / ferromagnetic composite ceramics

Method used

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  • Preparation method of ferro-electricity/ferro-magnetism multiple phase ceramic
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  • Preparation method of ferro-electricity/ferro-magnetism multiple phase ceramic

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Embodiment 1

[0025] Lead acetate is dissolved in acetic acid, butyl titanate, nickel acetate and iron nitrate are dissolved in ethylene glycol methyl ether respectively, and the concentrations are: 5mol / L, 5mol / L, 0.1mol / L and 0.1mol / L respectively. Then the four solutions were mixed to obtain the Pb-Ti-Ni-Fe precursor sol, and the molar concentrations of the four components were: 0.06mol / L, 0.06mol / L, 0.14mol / L and 0.28mol / L. The precursor sol was dried at 90°C for 60h, and then pretreated at 650°C for 2h to obtain a PbTiO-containing 3 and NiFe 2 o 4 The two-phase ceramic precursor is pressed into a ring under a pressure of 6MPa, and heat-treated at 1200°C for 2h to obtain PbTiO 3 and NiFe 2 o 4 Two-phase composite ceramics. The composition of composite ceramics is attached figure 1 Curve 1, it can be seen from the figure that the ceramic produced under the conditions of this example is PbTiO 3 、NiFe 2 o 4 two phases. Its appearance is attached figure 2 (a), it can be seen fro...

Embodiment 2

[0027] Lead acetate is soluble in acetic acid, butyl titanate, nickel acetate and ferric nitrate are respectively soluble in ethylene glycol methyl ether, the concentrations are: 4mol / L, 4mol / L, 0.2mol / L and 0.2mol / L respectively. Then the four solutions were mixed to obtain the Pb-Ti-Ni-Fe precursor sol, and the molar concentrations of the four components were: 0.05mol / L, 0.05mol / L, 0.15mol / L and 0.30mol / L. The precursor sol was dried at 100°C for 48h, and then pretreated at 800°C for 1h to obtain 3 and NiFe 2 o 4 Two-phase and partially amorphous ceramic precursors are pressed into a ring under a pressure of 5 MPa and heat-treated at 1100 ° C for 2.5 h to obtain PbTiO 3 and NiFe 2 o 4 Two-phase composite ceramics. The composition of composite ceramics is attached figure 1 Curve 2, it can be seen from the figure that the ceramic produced under the conditions of this example is PbTiO 3、NiFe 2 o 4 two phases. Its appearance is attached figure 2 (b), it can be seen f...

Embodiment 3

[0029] Lead acetate is dissolved in acetic acid, butyl titanate, nickel acetate and iron nitrate are dissolved in ethylene glycol methyl ether respectively, and the concentrations are: 3mol / L, 3mol / L, 0.3mol / L and 0.3mol / L respectively. Then the four solutions were mixed to obtain the Pb-Ti-Ni-Fe precursor sol, and the molar concentrations of the four components were: 0.04mol / L, 0.04mol / L, 0.16mol / L and 0.32mol / L. Dry the precursor sol at 110°C for 30h, and then pretreat it at 550°C for 1.5h to obtain a ceramic precursor that is entirely amorphous, press it into a ring shape under a pressure of 4MPa, and heat treat it at 1150°C for 2h. Get PbTiO 3 and NiFe 2 o 4 Two-phase composite ceramics. The composition of composite ceramics is attached figure 1 Curve 3, it can be seen from the figure that the ceramics produced under the conditions of this example are PbTiO 3 、NiFe 2 o 4 two phases. Its appearance is attached figure 2 (c), it can be seen from the figure that the ...

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Abstract

The invention discloses a preparing method of ferro-electricity / ferromagnetic composite ceramics, which comprises the following steps: adopting sol-gel original position method with ferro-electricity phase as PbTiO3 phase and ferromagnetic phase as NiFe2O4 phase; adopting lead acetate, butonat titanate, nickel acetate and ferric nitrate as solute; making acetate and ethylene glycol methyl ether as solvent to allocate collosol former; preheating under different temperature after drying to obtain the ceramic former; punching into piece shape; sintering under different temperature to produce PbTiO3 / NiFe2O4 multiple-phase ceramics.

Description

technical field [0001] The invention relates to the technical field of ferroelectric / ferromagnetic composite ceramics, in particular to a method for preparing high dielectric and high permeability ferroelectric / ferromagnetic composite ceramics in situ with sol-gel. Background technique [0002] With the rapid development of mobile communication and computer technology, various electronic devices have gradually become highly integrated, miniaturized, multi-functional and fast-responsive. Due to the high integration and miniaturization of electronic equipment, the electronic interference between electronic equipment is becoming more and more serious, thus requiring more anti-electromagnetic interference (EMI) filters to be distributed on increasingly narrow circuit boards. Thus, there arises a contradiction between miniaturization and integration of electronic equipment and a large demand for EMI filters. Since current passive filters are composed of discrete capacitive and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/00C04B35/26C04B35/472C04B35/624
Inventor 杜丕一董艳玲宋晨路翁文剑韩高荣赵高凌沈鸽徐刚张溪文
Owner ZHEJIANG UNIV
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