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A kind of x8r type ceramic capacitor porcelain and preparation method thereof

A technology for ceramic capacitors and ceramic materials, which is applied in the field of X8R type ceramic capacitor ceramic materials and their preparation, can solve the problems of complex preparation process, incompatibility with green electronic materials, and many components used, and achieves simple preparation process and temperature stability range. Wide, high dielectric constant effect

Inactive Publication Date: 2011-11-30
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cr is generally added to the currently reported X8R dielectric materials. 2 o 3 , CdO, PbO and other harmful compounds, which do not meet the requirements of green electronic material manufacturing, and use more components, and the preparation process is more complicated

Method used

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  • A kind of x8r type ceramic capacitor porcelain and preparation method thereof
  • A kind of x8r type ceramic capacitor porcelain and preparation method thereof
  • A kind of x8r type ceramic capacitor porcelain and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] An X8R type ceramic capacitor ceramic material and a preparation method thereof, wherein no CBS glass powder is added in the composition.

[0032] 1) Preparation of Bi 4 Ti 3 o 12 : Bi with a purity greater than 99% 2 o 3 and TiO 2 As raw material, according to Bi 2 o 3 :TiO 2 = 2:3 Weigh the material, mix the prepared material with absolute alcohol as the medium, ball mill and mix for 12 hours, dry and sieve, and then synthesize Bi at 800°C for 2 hours 4 Ti 3 o 12 ;

[0033] 2) According to the molar ratio: BaTiO 3 +x Bi 4 Ti 3 o 12 =1:0.05 ingredients, the so-called BaTiO 3 and Bi 4 Ti 3 o 12Add to absolute ethanol solvent, mix and ball mill for 12 hours, dry, and add binder after sieving. The binder is 5% polyvinyl alcohol (PVA) aqueous solution, the dosage is 0.3% of the total powder mass, dried, passed through a 50-mesh sieve, granulated into uniform particles, and pressed under a pressure of 100MPa to form a product with a diameter of 18mm and a...

Embodiment 2

[0037] An X8R type ceramic capacitor ceramic material and a preparation method thereof, in which CBS glass powder is added into the composition.

[0038] 1) Preparation of Bi 4 Ti 3 o 12 : Bi with a purity greater than 99% 2 o 3 and TiO 2 For the raw material. According to Bi 2 o 3 :TiO 2 = 2:3 Weigh the material, mix the prepared material with absolute alcohol as the medium, ball mill and mix for 12 hours, dry and sieve, and then synthesize Bi at 800°C for 2 hours 4 Ti 3 o 12 ;

[0039] 2) Preparation of CBS glass powder: CaCO with a purity greater than 98.5% 3 、H 3 BO 3 , SiO 2 , (NH 4 )H 2 PO 4 and ZnO as raw materials, according to aCaO+bB 2 o 3 + cSiO 2 +dP 2 o 5 +eZnO, where a=35~45%, b=20~25%, c=40~45%, d=0.5~2%, e=0.5~2% by mass percentage for batching, after mixing evenly, at 1380~ Melt at 1400°C for 1 to 2 hours, then pour into cold water to form glass slag, and obtain CBS glass powder with an average particle size of 5 μm after ball milling; ...

Embodiment 3

[0044] An X8R type ceramic capacitor ceramic material and a preparation method thereof, in which CBS glass powder is added into the composition.

[0045] 1) Preparation of Bi 4 Ti 3 o 12 : Bi with a purity greater than 99% 2 o 3 and TiO 2 For the raw material. According to Bi 2 o 3 :TiO 2 = 2:3 Weigh the material, mix the prepared material with absolute alcohol as the medium, ball mill and mix for 12 hours, dry and sieve, and then synthesize Bi at 800°C for 2 hours 4 Ti 3 o 12 ;

[0046] 2) prepare CBS glass powder by the method for embodiment 2;

[0047] 3) According to the ingredients BaTiO 3 +x Bi 4 Ti 3 o 12 +CBS glass powder, wherein x=0.03 moles, and the amount of CBS glass powder accounts for 3% of the total mass of the material. The so-called BaTiO 3 、 Bi 4 Ti 3 o 12 Add CBS glass powder to absolute ethanol solvent, mix and ball mill for 12 hours, dry, and add binder after sieving. The binder is 5% polyvinyl alcohol (PVA) aqueous solution, the dos...

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Abstract

The invention discloses an X8R ceramic capacitor ceramic material and a preparation method thereof. The ceramic material comprises BaTiO3 used as a main component and Bi4Ti3O12 and low-temperature CBS glass powder used as auxiliary components. The preparation method comprises the following steps: adding the Bi4Ti3O12 and CBS glass powder in a powder form into the BaTiO3 powder, then uniformly mixing in a ball mill, drying, granulating, and sintering, wherein the molar ratio is based on BaTiO3 + xBi4Ti3O12 + CBS glass powder, x = 0.01-0.05, and the amount of the CBS glass powder accounts for 0-10wt% the total mass of the ceramic material. The ceramic material can be co-sintered with base metals at medium temperature, has X8R temperature characteristics, and has the advantages of simple preparation process, low price and environment friendliness.

Description

technical field [0001] The invention belongs to a ceramic capacitor porcelain material, in particular to an environment-friendly, temperature-stable X8R type ceramic capacitor porcelain material and a preparation method thereof. Background technique [0002] With the rapid development of information technology and electronic technology, higher requirements are put forward for electronic equipment, such as miniaturization, chip type and light weight. Multilayer ceramic capacitors (MLCCs) were born out of these needs. At present, the commonly used dielectric material for preparing MLCC is BaTiO 3 base ceramics. After proper doping modification, BaTiO 3 Base ceramics are characterized by high dielectric constant, low loss, and small coefficient of thermal expansion. However, the capacitance-temperature (capacity temperature ΔC) characteristics of this type of material have certain limitations. When the temperature exceeds 125°C, the capacity temperature change rate (ΔC / C 2...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B35/626
Inventor 陈国华王丽娜
Owner GUILIN UNIV OF ELECTRONIC TECH
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