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Dielectric ceramic material for BT-BRT composite ultralow-loss multilayer ceramic dielectric capacitor, preparation method and application thereof

A technology of BT-BRT and dielectric ceramics, applied in the direction of fixed capacitor dielectric, stacked capacitors, capacitors, etc., can solve problems such as difficult to achieve COG characteristics, unable to meet the application requirements of ultra-low loss MLCC products, etc.

Active Publication Date: 2020-10-27
CHENGDU HONGMING & UESTC NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In recent years, the ultra-low loss dielectric ceramic material system used to have a dielectric constant of 40 and meet COG characteristics are: Ba 2 Ti 9 o 3 , CaTiO 3 、Ba 6-3x ln 8+2x Ti 18 o 54 and other systems; however, when the above systems are applied alone, their tgδ is relatively high, and it is difficult to achieve COG characteristics, which cannot meet the application requirements of ultra-low loss MLCC products

Method used

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  • Dielectric ceramic material for BT-BRT composite ultralow-loss multilayer ceramic dielectric capacitor, preparation method and application thereof
  • Dielectric ceramic material for BT-BRT composite ultralow-loss multilayer ceramic dielectric capacitor, preparation method and application thereof
  • Dielectric ceramic material for BT-BRT composite ultralow-loss multilayer ceramic dielectric capacitor, preparation method and application thereof

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preparation example Construction

[0028] The preparation method of this dielectric ceramic material comprises: (1) Ba 2 Ti 9 o 20 Synthesis: Weigh BaCO according to the molar ratio of 1:4.5 3 and TiO 2 Mix to obtain the first mixture; then mix the first mixture, deionized water and ball milling medium in a ball mill according to the mass ratio of 1:1.5:5 and then dry; add water and sieve and send it to a heating furnace for calcination to synthesize Ba 2 Ti 9 o 20 Burn the block; in this step, the BaCO 3 and TiO 2 The powder is used to make the contact area between the two larger and more fully contacted.

[0029] (2) Ba 6-3x Re 8+2x Ti 18 o 54 Synthesis: Take x=0.4-0.6, and take BaCO according to the molar ratio of 6-3x:8+2x:18 3 、Re 2 o 3 and TiO 2 , and mixed in a ball mill to obtain a second mixture; the second mixture is sent to a heating furnace for calcination to synthesize Ba 6-3x Re 8+2x Ti 18 o 54 Burn the block; in this step, the BaCO 3 、Re 2 o 3 and TiO 2 The powder is used ...

Embodiment 1

[0034] The present embodiment provides a kind of preparation method of dielectric ceramic material for BT-BRT composite ultra-low loss multilayer ceramic capacitor, comprising: (1) Ba 2 Ti 9 o 20 Synthesis: Weigh BaCO according to the molar ratio of 1:4.5 3 Powder and TiO 2 The powder is mixed to obtain the first mixture; then the first mixture, deionized water and ball milling medium are mixed in a ball mill according to the mass ratio of 1:1.5:5 and then dried; then deionized water is added to sieve and sent to the heating furnace Calcined inside to synthesize Ba 2 Ti 9 o 20 Burnt block material; (2) Ba 6-3x Re 8+2x Ti 18 o 54 Synthesis: Take x=0.4-0.6, and take BaCO according to the molar ratio of 6-3x:8+2x:18 3 Powder, Re 2 o 3 Powder and TiO 2 powder, and mixed in a ball mill to obtain a second mixture; the second mixture is sent to a heating furnace for calcination to synthesize Ba 6-3x Re 8+2x Ti 18 o 54 (3) Preparation of dielectric ceramic material: t...

Embodiment 2

[0036] The present embodiment provides a kind of preparation method of dielectric ceramic material for BT-BRT composite ultra-low loss multilayer ceramic capacitor, comprising: (1) Ba 2 Ti 9 o 20 Synthesis: Weigh BaCO according to the molar ratio of 1:4.5 3 Powder and TiO 2 The powder is mixed to obtain the first mixture; then the first mixture, deionized water and ball milling medium are mixed in a ball mill according to the mass ratio of 1:1.5:5 and then dried; then deionized water is added to sieve and sent to the heating furnace Calcined inside to synthesize Ba 2 Ti 9 o 20 Burnt block material; (2) Ba 6-3x Re 8+2x Ti 18 o 54 Synthesis: Take x=0.4-0.6, and take BaCO according to the molar ratio of 6-3x:8+2x:18 3 Powder, Re 2 o 3 Powder and TiO 2 powder, and mixed in a ball mill to obtain a second mixture; the second mixture is sent to a heating furnace for calcination to synthesize Ba 6-3x Re 8+2x Ti 18 o 54 (3) Preparation of dielectric ceramic material: 0...

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Abstract

The invention belongs to the technical field of electronic ceramic materials, and provides a dielectric ceramic material for a BT-BRT composite ultralow-loss multilayer ceramic dielectric capacitor, apreparation method and application thereof. The dielectric ceramic material is prepared by mixing a BT-BRT compound and a modified additive. The dielectric constant of the dielectric ceramic materialis 40 at 1MHz, the dielectric loss value tg delta is less than 1.5*10<-4>, and the dielectric loss value is small; and in a temperature range of -55 to 125DEG C, the capacity temperature coefficientis closer to zero, and the COG characteristic of the American EIA standard is met. The preparation method of the dielectric ceramic material comprises the following steps of: (1) synthesizing Ba2Ti9O20; (2) synthesizing Ba6-3xRe8+2xTi18O54; and (3) preparing the dielectric ceramic material. The preparation method can effectively improve the dielectric loss of the dielectric ceramic and improve thereliability of the dielectric ceramic material.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramic materials, and in particular relates to a dielectric ceramic material for a BT-BRT composite ultra-low loss multilayer ceramic capacitor, a preparation method and application thereof. Background technique [0002] Ultra-low-loss dielectric ceramic materials are the key materials for manufacturing high-frequency chip multilayer ceramic capacitors (MLCC). This type of MLCC is an important element for coupling, tuning, filtering, and DC blocking in circuits at a frequency of 1MHz. Devices, which have excellent performances such as high reliability, ultra-low loss value, and low temperature coefficient, are widely used in military, aviation, and aerospace circuits. [0003] According to the American Electrotechnical Association (EIA) standard, MLCCs of different dielectric ceramic materials are divided into three categories according to temperature stability: ultra-stable (Class I) dielectr...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622H01G4/12H01G4/30
CPCC04B35/468C04B35/622H01G4/1227H01G4/30C04B2235/3227C04B2235/3224C04B2235/6562C04B2235/6567
Inventor 江俊俊罗静李少利李红卫王兴才
Owner CHENGDU HONGMING & UESTC NEW MATERIALS
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