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Barium zirconate titanate-based capacitor ceramic and preparation method thereof

A barium zirconate titanate and capacitor technology, which is applied in the field of barium zirconate titanate-based capacitor ceramics and its preparation, can solve the problems of poor temperature stability, poor dielectric constant temperature stability, and low room temperature dielectric constant. Achieve the effects of improved temperature stability, high dielectric constant, and cost reduction

Active Publication Date: 2018-10-12
JIANGSU UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

Application number 200710036481.1 discloses a rare earth oxide doped modified dielectrically adjustable barium zirconate titanate-based ceramic Ba 1-x m x (Ti 1-y-0.25x Zr y )O 3 (M is a rare earth element, x=0.001~0.05; y=0.1~0.5), its dielectric loss at room temperature is only about 0.001, when x=0.02 Ba 1-x Eu x (Ti 0.8-0.25x Zr 0.2 )O 3 It has better temperature stability but its room temperature dielectric constant is only 3450; when x=0.02 Ba 1-x Y x (Ti 0.8-0.25x Zr 0.2 )O 3 Has a high room temperature dielectric constant 7070, but its dielectric constant temperature stability is not good
In the journal "Journal of Hubei Institute of Technology", Volume 28, Issue 6, 2012, in the article "Preparation and Dielectric Properties of Niobium-doped Barium Zirconate Titanate Ceramics", a BaZr prepared by solid-phase method is disclosed. 0.15 Ti 0.85-x Nb x o 3 Ceramics, although the dielectric constant at room temperature can be as high as 10 when a small amount of niobium is doped 4 order of magnitude, but its temperature stability is not good; although the temperature stability is significantly improved when the amount of doping is high, the room temperature dielectric constant is not higher than 2000

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  • Barium zirconate titanate-based capacitor ceramic and preparation method thereof
  • Barium zirconate titanate-based capacitor ceramic and preparation method thereof
  • Barium zirconate titanate-based capacitor ceramic and preparation method thereof

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Embodiment 1

[0024] The chemical formula of porcelain is: 0.97Ba(Zr 0.1 Ti 0.9 )O 3 -0.03Ba(Zn 1 / 3 Nb 2 / 3 )O 3 .

[0025] The preparation method of the ceramic material comprises the following steps:

[0026] (1) Weigh 0.2mol, 0.0194mol, 0.1746mol, 0.002mol, 0.002mol of BaCO respectively 3 , ZrO 2 ,TiO 2 , ZnO and Nb 2 o 5 , mixed to prepare the ingredients, the ingredients and agate balls and deionized water in a mass ratio of 1:2:3 into a nylon ball mill tank, wet ball milling in the tank mill with a speed of 110r / min for 24h to obtain a slurry material, then the slurry was dried at 130°C, controlled temperature increase rate of 300°C / h to 1080°C for 2h, and then synthesized 0.97Ba(Zr 0.1 Ti 0.9 )O3 -0.03Ba(Zn 1 / 3 Nb 2 / 3 )O 3 Main crystal phase powder;

[0027] (2) After wet ball milling the powder prepared above for 24 hours, dry it at 120°C, then add 5wt% polyvinyl alcohol (PVA) aqueous solution to granulate, pass through a 40-mesh sieve, and mold to obtain a Φ10mm tabl...

Embodiment 2

[0031] The chemical formula of porcelain is: 0.95Ba(Zr 0.1 Ti 0.9 )O 3 -0.05Ba(Zn 1 / 3 Nb 2 / 3 )O 3 .

[0032] The preparation method of the ceramic material comprises the following steps:

[0033] (1) Weigh 0.2mol, 0.019mol, 0.171mol, 0.00333mol, 0.00333mol of BaCO respectively 3 , ZrO 2 ,TiO 2 , ZnO and Nb 2 o 5 , mixed to prepare ingredients, the ingredients and agate balls and deionized water in a mass ratio of 1:1.5:2.5 into a nylon ball mill tank, wet ball milling in the tank mill at a speed of 110r / min for 24h to obtain a slurry Then the slurry was dried at 130°C, and the temperature was controlled at a rate of 300°C / h to rise to 1100°C for calcination for 2 hours, and the solid phase reaction synthesized 0.95Ba(Zr 0.1 Ti 0.9 )O 3 -0.05Ba(Zn 1 / 3 Nb 2 / 3 )O 3 Main crystal phase powder;

[0034] (2) After wet ball milling the powder prepared above for 24 hours, dry it at 120°C, then add 6wt% polyvinyl alcohol (PVA) aqueous solution to granulate, pass through...

Embodiment 3

[0038] The chemical formula of porcelain is: 0.96Ba(Zr 0.1 Ti 0.9 )O 3 -0.04Ba(Zn 1 / 3 Nb 2 / 3 )O 3 .

[0039] The preparation method of the ceramic material comprises the following steps:

[0040] (1) Weigh 0.2mol, 0.0192mol, 0.1728mol, 0.00266mol, 0.00266mol of BaCO respectively 3 , ZrO 2 ,TiO 2 , ZnO and Nb 2 o 5 , mixed to prepare ingredients, the ingredients and agate balls and deionized water in a mass ratio of 1:1.5:2.5 into a nylon ball mill tank, wet ball milling in a tank mill with a speed of 110r / min for 16h to obtain a slurry Then the slurry was dried at 130°C, and the temperature was controlled at a rate of 300°C / h to rise to 1050°C for calcination for 2 hours, and the solid phase reaction synthesized 0.96Ba(Zr 0.1 Ti 0.9 )O 3 -0.04Ba(Zn 1 / 3 Nb 2 / 3 )O 3 Main crystal phase powder;

[0041] (2) After wet ball milling the powder prepared above for 24 hours, dry it at 120°C, then add 5wt% polyvinyl alcohol (PVA) aqueous solution to granulate, pass throu...

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Abstract

The invention discloses barium zirconate titanate-based capacitor ceramic and a preparation method thereof. A molecular formula of the ceramic is as follows: (1-y)Ba(ZrxTi1-x)O3-yBa(Zn1 / 3Nb2 / 3)O3; thepreparation method comprises the following steps: firstly, weighing BaCO3, ZrO2, TiO2, ZnO and Nb2O5 according to the mol ratio; carrying out solid-phase reaction to prepare main crystal phase powder; then carrying out wet-process ball milling on the main crystal phase powder, granulating and carrying out die pressing and molding to prepare a sheet-shaped blank; finally, degumming and sintering to prepare the barium zirconate titanate-based capacitor ceramic. According to the ceramic disclosed by the invention, barium zirconate titanate and barium zincate niobate systems are compounded to obtain B-site compound type perovskite-structure single-phase solid solution ceramic; the barium zirconate titanate-based capacitor ceramic has the characteristics of high dielectric constant and low dielectric loss; diffuse phase transition is induced so that the temperature change rate of a capacitor meets Y5V standards.

Description

technical field [0001] The invention belongs to the field of ceramics, in particular to a barium zirconate titanate-based capacitor ceramic material and a preparation method thereof. Background technique [0002] The strong sales and demand of consumer electronics products such as digital cameras, mobile phones, computers and automotive electronics maintain the continuous development of the ceramic capacitor market. The American Electronics Industries Association (EIA) classifies ceramic capacitors as follows: [0003] [0004] Among them, X7R, Y5V and Z5U are the most commonly used capacitor specifications. X7R capacitors have stable electrical performance and are mainly suitable for occasions such as coupling, bypass, and filter circuits with high requirements, while Y5V and Z5U capacitors are mainly used for DC blocking and bypass. circuit or decoupling circuit. [0005] Barium titanate crystal is a typical perovskite structure ferroelectric, barium zirconate titanat...

Claims

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Application Information

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IPC IPC(8): C04B35/49
CPCC04B35/49C04B2235/96C04B2235/442C04B2235/3255C04B2235/3284
Inventor 张晨陈方旭钟鑫唐柱明张梦圆李聪宇
Owner JIANGSU UNIV OF SCI & TECH
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