Preparation method of ceramic grain boundary layer condensor

A technology of ceramic capacitors and grain boundary layers, which is applied in the direction of fixed capacitor dielectrics and components of fixed capacitors, can solve the problems of high cost, complex process, uneven grain boundary structure, etc., and achieve high band gap, simple process, and aging good performance

Inactive Publication Date: 2007-02-21
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a grain boundary layer capacitor by one-time firing, so as to overcome the shortcomings of the prior art such as complex process, high cost, and uneven grain boundary structure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Select the matrix material and grain boundary phase material:

[0021] Select hexagonal silicon carbide particles as the ceramic matrix material, the basic particle size is 8 microns, the largest particle size is less than 28 microns, and the smallest particle size is greater than 3 microns; the basic particle size of the selected relaxor ferroelectric material is 2-25 microns;

[0022] A eutectic mixture composed of alumina, magnesia and silicon oxide is selected as the grain boundary phase;

[0023] Silver nitrate, bismuth oxide, turpentine, etc. are selected as the basic materials of the electrode and configured into silver paste.

[0024] 2. Packaging process:

[0025] a. Add water to the powder of the ceramic matrix material to form a suspension, ultrasonically disperse it for 10 minutes, place it on a magnetic stirrer and stir it vigorously, and the pH value is 2;

[0026] b. prepare a compound solution composed of grain boundary phase substances, the pH valu...

Embodiment 2

[0032] Barium titanate is selected as the ceramic base material, and copper sulfate and magnesium nitrate form the grain boundary insulating phase, and the grain boundary phase content is 25% (percentage by weight); the particle wrapping process uses a sol-gel method, and the process conditions are as in Example 1; The pressure sintering process is fired once, the firing temperature is 950°C, the heating rate is 300°C / hour, and the holding time is 4 hours. The preparation of the sample electrode is the same as in Example 1, and the dielectric constant of the obtained capacitor is greater than 2500.

Embodiment 3

[0034] Hexagonal silicon carbide particles are selected as the ceramic matrix material, and copper oxide is selected as the grain boundary phase; the particle wrapping process uses the sol-gel method, and the process conditions are as in Example 1; the normal pressure sintering process is used for one-time firing, and the firing temperature is 900 ° C , the heating rate is 200°C / hour, and the holding time is 1 hour. Silver nitrate, bismuth oxide, turpentine, etc. were selected as the basic materials of the electrode, and were configured into silver paste. The preparation of the sample electrode was the same as in Example 1, and the dielectric constant of the obtained capacitor was greater than 1800.

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Abstract

The method selects hexagonal silicon carbide or relaxation iron electric material in semiconduction as ceramic basic material, selects low eutectic mixture consisting of copper oxide, aluminium oxide, magnesium oxide and silicon oxide as high insulation boundary phase to prepare boundary ceramic capacitor by one-time buring through utilizing article wrapping up technique to realize distributive homogenization for structure and phase.

Description

Technical field [0001] The invention relates to a preparation process of a ceramic capacitor, in particular to a preparation method of a ceramic grain boundary layer capacitor. Background technique [0002] In recent years, the miniaturization and high density of electronic circuits have developed rapidly. The role of electronic ceramics as the basis of the electronic industry has attracted more and more attention, and has also achieved an important position in the high-tech field. Ceramic capacitors are widely used in household appliances, communication equipment, industrial instruments and other fields due to their small size, large capacity, simple structure, excellent high-frequency characteristics, wide variety, low price, and easy mass production. Since Germany and the United States began to study capacitors with ceramic as the medium around 1920, capacitor ceramic materials have been extensively researched and developed, and new materials have emerged continuously. C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G4/12C04B35/00
Inventor 张锐王海龙许红亮关绍康
Owner ZHENGZHOU UNIV
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