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Method for preparing multiferroic composite ceramic

A composite ceramic and multiferroic technology, which is applied in the field of composite ceramics, can solve problems such as harsh reaction conditions, long reaction cycle, and complicated process, and achieve the effects of short reaction cycle, low cost, and improved magnetic properties

Inactive Publication Date: 2017-05-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the improvement of the performance of multiferroic composite materials mainly focuses on changing the composite method and the formulation of the material, but these processes are often complicated, the reaction cycle is long, the reaction conditions are relatively harsh, and the formulation is complicated.

Method used

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  • Method for preparing multiferroic composite ceramic
  • Method for preparing multiferroic composite ceramic
  • Method for preparing multiferroic composite ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) According to 0.9BaTiO3 -0.1BaFe 12 o 19 , the BaTiO 3 、BaFe 12 o 19 Mix the powders, put the mixture and absolute ethanol in a mortar according to the mass ratio of 1:1, ultrasonically treat for 30 minutes, filter and collect the mixed powder after ultrasonic mixing, and dry in a vacuum oven to obtain mixture A ;

[0029] 2) The obtained mixture A is granulated, and then the obtained powder is molded at 110MPa to obtain a molded 0.9BaTiO 3 -0.1BaFe 12 o 19 Composite body;

[0030] 3) After the composite green body is held at 600°C for 1 hour for debinding treatment, the composite green body is sintered in a microwave sintering furnace, first at 900°C, and held for 3 minutes; then the temperature is raised to 1110°C, sintered for 60s, and cooled with the furnace.

[0031] 4) The resulting 0.9BaTiO 3 -0.1BaFe 12 o 19 As for the composite ceramics, in the atmosphere sintering furnace, the temperature was raised from room temperature to 800°C at a rate of 2°C / ...

Embodiment 2

[0033] 1) According to 0.8BaTiO 3 -0.2BaFe 12 o 19 , the BaTiO 3 、BaFe 12 o 19 Mix the powders, put the mixture and absolute ethanol in a mortar at a mass ratio of 1:1, ultrasonically treat for 20 minutes, filter and collect the mixed powder after ultrasonic mixing, and dry in a vacuum oven to obtain a mixture A ;

[0034] 2) The obtained mixture A is granulated, and then the obtained powder is molded at 120MPa to obtain a molded 0.8BaTiO 3 -0.2BaFe 12 o 19 Composite body;

[0035] 3) After the composite green body is held at 600°C for 1 hour for debinding treatment, the composite green body is sintered in a microwave sintering furnace, first at 850°C for 3 minutes, then heated to 1100°C, sintered for 50s, and cooled with the furnace.

[0036] 4) the resulting 0.8BaTiO 3 -0.2BaFe 12 o 19 As for the composite ceramics, in the atmosphere sintering furnace, the temperature was raised from room temperature to 730°C at a rate of 3°C / min under nitrogen atmosphere and kep...

Embodiment 3

[0038] 1) According to 0.7BaTiO 3 -0.3BaFe 12 o 19 , the BaTiO 3 、BaFe 12 o 19 The powders are mixed, the mixture and absolute ethanol are placed in a mortar according to the mass ratio of 1:1, and the ultrasonic treatment is performed for 40 minutes, and the mixed powder after ultrasonic mixing is collected by filtration and dried in a vacuum oven to obtain a mixture A

[0039] 2) The obtained mixture A is granulated, and then the resulting powder is molded at 100MPa to obtain a molded 0.7BaTiO 3 -0.3BaFe 12 o 19 Composite body;

[0040] 3) After the composite green body is held at 600°C for 1 hour for debinding treatment, the composite green body is sintered in a microwave sintering furnace, first at 850°C for 5 minutes; then the temperature is raised to 1000°C, sintered for 45s, and cooled with the furnace.

[0041] 4) The resulting 0.7BaTiO 3 -0.3BaFe 12 o 19 As for the composite ceramics, in the atmosphere sintering furnace, the temperature was raised from room...

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Abstract

The invention discloses a method for preparing multiferroic composite ceramic. The method comprises the following steps: putting nano BaTiO3 and BaFe12O19 powder into absolute ethyl alcohol according to a certain ratio, performing ultrasonic treatment for 20-40 minutes, filtering the mixed powder which is uniformly mixed in an ultrasonic manner, collecting, putting into a vacuum drying box, and drying at 50-80 DEG C so as to obtain a mixture A; pelleting a mixed material, aging, pressing into a circular flaky blank, putting the molded blank into a box furnace, and performing degluing treatment; cooling, performing microwave sintering, and performing furnace cooling so as to obtain BaTiO3-BaFe12O19 composite ceramic; performing thermal treatment on the obtained composite material in a nitrogen (N2) atmosphere, thereby obtaining the composite ceramic material which has excellent magnetism. The method is low in preparation cost, simple to operate, short in reaction cycle, low in microwave sintering temperature, good in ceramic density and excellent in product magnetism, and the maximum magnetization intensity of a sample at the room temperature can be up to 75emu / g.

Description

Technical field: [0001] The invention belongs to the technical field of composite ceramics, and in particular relates to a preparation method of multiferroic composite ceramics. Background technique: [0002] Multiferroic composite materials have multiple properties such as ferroelectricity and ferromagnetism at the same time. The physical properties of this material are often determined by the structure and inversion of electric and magnetic domains in the microscopic scale. As an important electronic ceramic material, BaTiO 3 -BaFe 12 o 19 Multiferroic composite materials are widely used in sensors, multi-state storage devices, ferroelectric devices and so on. Due to the existence of Fe element in this multiferroic composite material, Fe will often exist at the same time. 2+ and Fe 3+ , and the appearance of this mixed valence metal particle will cause changes in the concentration of oxygen vacancies in the material, thereby affecting the magnetic properties of the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/64
CPCC04B35/4682C04B35/64C04B2235/3274C04B2235/656C04B2235/658C04B2235/661C04B2235/667C04B2235/96
Inventor 蒲永平董子靖
Owner SHAANXI UNIV OF SCI & TECH
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