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A kind of composite ceramic material and preparation method thereof

A technology of composite ceramics and ball milling, which is applied to fixed capacitor parts, fixed capacitors, fixed capacitor dielectrics, etc., can solve the problems of not being high enough and difficult to combine, so as to improve the breakdown electric field, facilitate implementation, and increase energy storage effect of density

Active Publication Date: 2022-06-24
GUANGDONG HUST IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, based on (Bi 0.5 Na 0.5 )TiO 3 The ceramic W rec The value is still not high enough (less than 2.5J / cm 3 ), and it is difficult to combine high W rec and a high η of greater than 85%

Method used

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  • A kind of composite ceramic material and preparation method thereof
  • A kind of composite ceramic material and preparation method thereof
  • A kind of composite ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0037] For the preparation method of the composite ceramic material, the following preparation steps are included:

[0038] Step 1, separate Bi 2 O 3 , Na 2 CO 3 , SrCO 3 , TiO 2 According to the chemical formula 0.5 (Bi 0.5 Na 0.5 )TiO 3 -0.5(Sr 0.7 Bi 0.2 )TiO 3 Carry out batching, the mixture obtained by batching is ball-milled and mixed under anhydrous ethanol medium to obtain slurry, and then the slurry is put into an oven and dried at 80 ° C, and finally 0.5 (Bi) is formed. 0.5 Na 0.5 )TiO 3 -0.5(Sr 0.7 Bi 0.2 )TiO 3 powder;

[0039] In step 2, the 0.5 (Bi 0.5 Na 0.5 )TiO 3 -0.5(Sr 0.7 Bi 0.2 )TiO 3 The powder is put into a crucible and pre-fired in an air atmosphere. Specifically, 0.5 (Bi 0.5 Na 0.5 )TiO 3 -0.5(Sr 0.7 Bi 0.2 )TiO 3 The powder is burned in air at 850℃ for 3 hours;

[0040] Step 3, put 0.5 (Bi 0.5 Na 0.5 )TiO 3 -0.5(Sr 0.7 Bi 0.2 )TiO 3 The pre-fired powder is granulated and sieved, then put into a crucible, and subjecte...

specific Embodiment 1

[0043] This example is for the preparation of single-phase 0.5 (Bi 0.5 Na 0.5 )TiO 3 -0.5(Sr 0.7 Bi 0.2 )TiO 3 Ceramic material, including the following steps:

[0044] (1) Using Bi 2 O 3 , Na 2 CO 3 , SrCO 3 , TiO 2 As the raw material, according to the chemical formula 0.5 (Bi 0.5 Na 0.5 )TiO 3 -0.5(Sr 0.7 Bi 0.2 )TiO 3 make ingredients;

[0045] (2) Using absolute ethanol as a medium, the mixture obtained in the previous step was ball-milled for 24 hours and dried at 80°C;

[0046] (3) pre-calcining the dried mixture powder, specifically, calcining the mixture powder in the air at 850 ° C for 3 hours, the temperature rise and fall rate is 3.5 ° C / min, to obtain 0.5 (Bi 0.5 Na 0.5 )TiO 3 -0.5(Sr 0.7 Bi 0.2 )TiO 3 Pre-fired powder;

[0047] (4) Set 0.5 (Bi 0.5 Na 0.5 )TiO 3 -0.5(Sr 0.7 Bi 0.2 )TiO 3 After the calcined powder is dried, granulation, tableting and sintering are carried out. Specifically, PVA was added as a binder for granulation an...

specific Embodiment 2

[0048] This example is to prepare 0.5 (Bi 0.5Na 0.5 )TiO 3 -0.5(Sr 0.7 Bi 0.2 )TiO 3 / BN composite ceramic material, including the following steps:

[0049] (1) Using Bi 2 O 3 , Na 2 CO 3 , SrCO 3 , TiO 2 As the raw material, according to the chemical formula 0.5 (Bi 0.5 Na 0.5 )TiO 3 -0.5(Sr 0.7 Bi 0.2 )TiO 3 make ingredients;

[0050] (2) Using absolute ethanol as a medium, the mixture obtained in the previous step was ball-milled for 24 hours and dried at 80°C;

[0051] (3) pre-calcining the dried mixture powder, specifically, calcining the mixture powder in air at 850° C. for 3 hours to obtain 0.5 (Bi 0.5 Na 0.5 )TiO 3 -0.5(Sr 0.7 Bi 0.2 )TiO 3 Pre-fired powder;

[0052] (4) to 0.5 (Bi 0.5 Na 0.5 )TiO 3 -0.5(Sr 0.7 Bi 0.2 )TiO 3 The calcined powder is subjected to high temperature heat treatment. Specifically, at 0.5 (Bi 0.5 Na 0.5 )TiO 3 -0.5(Sr 0.7 Bi 0.2 )TiO 3 8wt% polyvinyl alcohol solution (concentration of 5%) was added to the pr...

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Abstract

The invention discloses a composite ceramic material and a preparation method thereof. The composite ceramic material is composed of 0.5 (Bi 0.5 Na 0.5 ) TiO 3 ‑0.5 (Sr 0.7 Bi 0.2 ) TiO 3 Powder and boron nitride particles according to chemical formula 0.5 (Bi 0.5 Na 0.5 ) TiO 3 ‑0.5 (Sr 0.7 Bi 0.2 ) TiO 3 / BN made, the 0.5 (Bi 0.5 Na 0.5 ) TiO 3 ‑0.5 (Sr 0.7 Bi 0.2 ) TiO 3 The powder is made of Bi 2 o 3 、Na 2 CO 3 , SrCO 3 、TiO 2 According to the chemical formula 0.5 (Bi 0.5 Na 0.5 ) TiO 3 ‑0.5 (Sr 0.7 Bi 0.2 ) TiO 3 It is made by mixing the ingredients. The composite ceramic material prepared by the invention has both high energy storage density and high energy storage efficiency, and can be used to manufacture high-power dielectric energy storage devices.

Description

technical field [0001] The invention relates to the field of dielectric ceramic materials, in particular to a composite ceramic material and a preparation method thereof. Background technique [0002] Compared with supercapacitors and lithium-ion batteries, dielectric energy storage capacitors have ultra-high power density, very fast charge-discharge rates, and long cycle life. They are important new power storage devices with huge potential applications in new energy vehicles, smart grids, and medical devices. At present, commercial pulse energy storage capacitors are mainly polypropylene (PP), whose recoverable energy storage density (W rec ) very low (usually below 1J / cm 3 ). To improve W rec In recent years, researchers have developed many dielectric materials to replace PP, including PVDF polymers, glass ceramics, ferroelectric and antiferroelectric ceramics. Although W rec Improvements have been made, but the energy storage efficiency is still very low. How to D...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/622H01G4/12
CPCC04B35/475C04B35/622H01G4/1218C04B2235/3201C04B2235/3213C04B2235/386C04B2235/96C04B2235/5445
Inventor 张海波范鹏元南博李利松肖建中郭新卢亚张国军
Owner GUANGDONG HUST IND TECH RES INST
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