Lead-free bismuth ferrite-based ceramic material and preparation method thereof

A lead-free bismuth ferrite-based, ceramic material technology, applied in the field of dielectric materials, can solve the problems of low energy storage density and energy storage efficiency, low breakdown electric field strength, etc., achieve high energy storage density and energy storage efficiency, improve Breakdown electric field strength, the effect of reducing remanent polarization

Active Publication Date: 2020-05-29
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a lead-free bismuth ferrite-based ceramic material with high energy storage density and energy storage efficiency and its preparation method, which can better overcome the low energy storage density and energy storage efficiency of existing lead-free energy storage ceramics, And the defect of small breakdown electric field strength

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  • Lead-free bismuth ferrite-based ceramic material and preparation method thereof
  • Lead-free bismuth ferrite-based ceramic material and preparation method thereof
  • Lead-free bismuth ferrite-based ceramic material and preparation method thereof

Examples

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Embodiment 1

[0043] A lead-free bismuth ferrite-based ceramic with high energy storage density and energy storage efficiency, the chemical composition of the ceramic is (1-x)(0.67BiFeO 3 -0.33BaTiO 3 )-xNa 0.73 Bi 0.09 NbO 3 +0.1wt%Mn 3 o 4 , where x=0.06.

[0044] The concrete preparation steps of this ceramic material are as follows:

[0045] (1) Select Bi with a purity greater than 98% 2 o 3 , Fe 2 o 3 、BaCO 3 、TiO 2 、Na 2 CO 3 , Nb 2 o 5 and Mn 3 o 4 As a raw material for bismuth ferrite-based lead-free ceramic dielectric materials with high energy storage density and energy storage efficiency;

[0046] (2) According to the chemical formula (1-x) (0.67BiFeO 3 -0.33BaTiO 3 )-xNa 0.73 Bi 0.09 NbO 3 (Wherein x=0.06) Weigh the raw material, and make it mix homogeneously through a ball milling process, obtain the initial raw material powder; Wherein when ball milling, adopt dehydrated alcohol and ZrO 2 balls as the milling medium, ZrO 2 The mass ratio of balls to ra...

Embodiment 2

[0055] A lead-free bismuth ferrite-based ceramic with high energy storage density and energy storage efficiency, the chemical composition of the ceramic is (1-x)(0.67BiFeO 3 -0.33BaTiO 3 )-xNa 0.73 Bi 0.09 NbO 3 +0.1wt%Mn 3 o 4 , where x=0.08. Concrete preparation steps are as follows:

[0056] (1) Select Bi with a purity greater than 98% 2 o 3 , Fe 2 o 3 、BaCO 3 、TiO 2 、Na 2 CO 3 , Nb 2 o 5 and Mn 3 o 4 As a raw material for bismuth ferrite-based lead-free ceramic dielectric materials with high energy storage density and energy storage efficiency;

[0057] (2) According to the chemical formula (1-x) (0.67BiFeO 3 -0.33BaTiO 3 )-xNa 0.73 Bi 0.09 NbO 3 (wherein x=0.08) take the raw material, and make it mix uniformly through a ball milling process to obtain the initial raw material powder; wherein absolute ethanol and ZrO are used during ball milling 2 balls as the milling medium, ZrO 2 The mass ratio of balls to raw materials is 2:1, the mass ratio of a...

Embodiment 3

[0066] A lead-free bismuth ferrite-based ceramic with high energy storage density and energy storage efficiency, the chemical composition of the ceramic is (1-x)(0.67BiFeO 3 -0.33BaTiO 3 )-xNa 0.73 Bi 0.09 NbO 3 +0.1wt%Mn 3 o 4 , where x=0.10. Concrete preparation steps are as follows:

[0067] (1) Select Bi with a purity greater than 98% 2 o 3 , Fe 2 o 3 、BaCO 3 、TiO 2 、Na 2 CO 3 , Nb 2 o 5 and Mn 3 o 4 As a raw material for bismuth ferrite-based lead-free ceramic dielectric materials with high energy storage density and energy storage efficiency;

[0068] (2) According to the chemical formula (1-x) (0.67BiFeO 3 -0.33BaTiO 3 )-xNa 0.73 Bi 0.09 NbO 3 (Wherein x=0.10) Weigh the raw material, and make it mix uniformly through a ball milling process to obtain the initial raw material powder; wherein absolute ethanol and ZrO are used during ball milling 2 balls as the milling medium, ZrO 2 The mass ratio of balls to raw materials is 2.0:1, the mass ratio o...

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Abstract

The invention relates to a lead-free bismuth ferrite-based ceramic material. The chemical composition of the lead-free bismuth ferrite-based ceramic material is (1-x)[(1-y)BiFeO3-yBaTiO3]-xNa0.73Bi0.09NbO3+zMn3O4; the lead-free bismuth ferrite-based ceramic material is prepared by adopting a solid-phase reaction method and a tape casting method. The preparation method comprises the steps: proportioning raw materials according to a stoichiometric ratio, carrying out primary ball milling, and calcining at the temperature of 720-750 DEG C to obtain pre-synthesized powder; carrying out secondary ball milling, sieving, tape casting and other processes to obtain a bismuth ferrite-based leadless high-energy-storage-density and high-energy-storage-efficiency ceramic green body; and finally, carrying out high-temperature sintering at the temperature of 1000-1020 DEG C to obtain the lead-free bismuth ferrite-based ceramic material. Compared with the prior art, the material has the advantages ofbeing high in energy storage density and energy storage efficiency, low in sintering temperature, stable in preparation process, capable of meeting the requirement for lead-free development of electronic components, high in practicability and the like.

Description

technical field [0001] The invention relates to the field of dielectric materials, in particular to a lead-free bismuth ferrite-based ceramic material with high energy storage density and energy storage efficiency and a preparation method thereof. Background technique [0002] With the rapid development of the global economy and information technology, the demand for energy is increasing day by day, and the development trend of miniaturization and integration of electronic components requires higher and higher performance of materials. Ceramic dielectric capacitors are widely used in laser, radar, mobile communication, aerospace and many other fields due to their fast charging and discharging speed, high power density, long cycle life, wide temperature range and good safety. At present, the industrialized ceramic dielectric capacitors are mainly lead-based antiferroelectric materials, but lead-based ceramic materials contain a large amount of lead elements, which will bring ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622
CPCC04B35/453C04B35/62218C04B2235/3236C04B2235/3255C04B2235/3263C04B2235/3272C04B2235/442C04B2235/6562C04B2235/96
Inventor 翟继卫闫非沈波
Owner TONGJI UNIV
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