Method for preparation of novel pipe type ceramic capacitor

A ceramic capacitor and tube-type technology, which is applied in the field of tube-type ceramic capacitor preparation, can solve the problem of low dielectric constant and achieve the effect of improving performance indicators

Inactive Publication Date: 2005-06-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In practical applications, in order to obtain effective suppression of lower frequency interference signals, it is necessary to greatly increase the capacitance of tubular capacitors. Due to the low dielectric constant of conventional dielectric ceramic materials (about tens to thousands), it is difficult to Meet the performance index of greatly improved capacitance without increasing the geometric size of the device

Method used

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  • Method for preparation of novel pipe type ceramic capacitor
  • Method for preparation of novel pipe type ceramic capacitor
  • Method for preparation of novel pipe type ceramic capacitor

Examples

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example 1

[0039] Example 1: Surface layer tubular ceramic capacitor

[0040] After adding 0.5wt% Nd 2 o 3 , 0.4wt% Bi 2 / 3 ZrO 3 and 0.1wt% MnO 2 High dielectric strength and high stability BaTiO 3 Semi-conductor ceramic material, the outer diameter φ is obtained by extrusion process 外 =2.4mm, inner diameter φ 内=1.8mm, length L=4mm porcelain tube, after the porcelain tube is sintered in the air at 1320°C, and then heat-treated in a reducing atmosphere at 1000°C-1100°C for 1-2 hours, a semi-conductor with a resistivity less than 2Ω·cm can be obtained. Conductive porcelain tube. The semiconductive porcelain tube is oxidized properly in the air at 900°C-1000°C, and the properties that can be obtained are: capacitance C>10000pF, dielectric loss tgδ1000MΩ, capacitance Temperature change rate ΔC / C(-25-+85℃)≤±15%, impact voltage V b ≥800v surface layer tubular ceramic capacitors.

example 2

[0041] Example 2: Grain Boundary Layer Tubular Ceramic Capacitor

[0042] After adding 0.2wt% Ta 2 o 5 , 0.4 wt% SiO 2 and 0.1wt%Al 2 o 3 SrTiO 3 Porcelain material, the outer diameter φ is obtained by extrusion process 外 =2.4mm, inner diameter φ 内 =1.8mm, length L=4mm porcelain tube, the resistivity of the porcelain tube is about 0.5Ωcm after reduction and sintering at 1450°C, and the uniform coating composition on the surface of the semiconducting porcelain tube is 50wt%PbO+40wt%Bi 2 o 3 +5wt%Cu 2 O+15wt%B 2 o 3 After the mixed coating is heat treated in the air at 1200°C for 1-2 hours, the properties that can be obtained are: capacitance C>10000pF, dielectric loss tgδ1000MΩ, capacitance temperature change ΔC / C (-25~+85℃)≤±10%, breakdown voltage V b ≥300v grain boundary layer tubular ceramic capacitors.

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Abstract

This invention provides a method for preparing pipe type ceramic capacitor containing the method for preparing surface layer-pipe type ceramic capacitor and grain boundary later pipe type ceramic capacitor through preparing semiconductor ceramic material with high effective dielectric constant to substitute I group or II group medium ceramic material for preparing large capacity pipe type ceramic capacitor. The effective dielectric constant of said semiconductor ceramic can reach to ten of thousands even hundred of thousands.

Description

technical field [0001] The invention belongs to the technical field of ceramic capacitors, in particular to the preparation technology of tubular ceramic capacitors. Background technique [0002] As we all know, ceramic capacitors are basic electronic components with a wide range of applications and a large amount. According to statistics, the consumption of ceramic capacitors accounts for more than 80% of the consumption of various capacitors. Ceramic capacitors mainly perform coupling, DC blocking, bypass, filtering, energy storage and other functions in electronic circuits, and can also be combined with other electronic components to form an oscillation circuit to perform tasks such as signal transmission, reception, and processing. With the rapid expansion of the application field of electronic equipment, various electromagnetic interference problems caused by natural or human factors have become increasingly prominent. At present, the main ways to suppress electromagn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/12
Inventor 钟朝位张树人
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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