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Dielectric material for high dielectric constant x8r type multilayer ceramic capacitor and preparation method thereof

A high dielectric constant, multi-layer ceramic technology, applied in the field of dielectric ceramics, can solve the problems of insufficient dielectric temperature stability, high price, unsuitable for mass production, etc., and achieve good wide temperature stability and low cost , easy-to-operate effect

Active Publication Date: 2017-08-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two features of high Curie point and core-shell structure make BT-NBT-Nb(0.9BaTiO 3 -0.1Na 0.5 Bi 0.5 TiO 3 -Nb 2 o 5 ) system is very conducive to the preparation of dielectric materials for multilayer ceramic capacitors with wide temperature stability, but its dielectric temperature stability is still not enough to meet the standards of the EIA-XnR series
[0005] The wide-temperature stable dielectric material prepared for BT-NBT materials in the existing invention usually uses rare earth metal elements (Sm, Ce, La, Pr, Nd, Tb, Ho, etc.) as additives (patent No. Wide temperature stability range, but expensive, not suitable for mass production

Method used

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  • Dielectric material for high dielectric constant x8r type multilayer ceramic capacitor and preparation method thereof
  • Dielectric material for high dielectric constant x8r type multilayer ceramic capacitor and preparation method thereof
  • Dielectric material for high dielectric constant x8r type multilayer ceramic capacitor and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] Take Na 2 CO 3 、 Bi 2 o 3 and TiO 2 As the raw material, mix according to the molar ratio of Na, Bi, Ti element 1:1:2, put the prepared raw material into the ball mill and mix and ball mill by wet ball milling method. The ball milling medium is zirconia balls and absolute ethanol, and they are mixed and ball milled for 24 hours. Then it was dried at 100°C for 12 hours, and then put into a high-temperature furnace for pre-calcination. The pre-calcination process is to raise the temperature to 850°C at a rate of 4°C / min at room temperature, keep it for 3 hours, and naturally cool with the furnace to obtain Na 0.5 Bi 0.5 TiO 3 Powder. BaCO by molar ratio 3 : TiO 2 = 1:1 for batching, put the prepared raw materials into the ball mill and use wet ball milling method to mix and ball mill. The ball milling medium is zirconia balls and absolute ethanol, and they are mixed and ball milled for 24 hours. Then it was dried at 100°C for 12 hours, and then put into a high...

Embodiment 2

[0038] Take Na 2 CO 3 、 Bi 2 o 3 and TiO 2 As the raw material, mix according to the molar ratio of Na, Bi, Ti element 1:1:2, put the prepared raw material into the ball mill and mix and ball mill by wet ball milling method. The ball milling medium is zirconia balls and absolute ethanol, and they are mixed and ball milled for 22 hours. Then it was dried at 80°C for 24 hours, and then put into a high-temperature furnace for pre-calcination. The pre-calcination process is to raise the temperature to 800 °C at a rate of 4 °C / min at room temperature, keep it for 4 hours, and naturally cool with the furnace to obtain Na 0.5 Bi 0.5 TiO 3 Powder. BaCO by molar ratio 3 : TiO 2 = 1:1 for batching, put the prepared raw materials into the ball mill and use wet ball milling method to mix and ball mill. The ball milling medium is zirconia balls and absolute ethanol, and they are mixed and ball milled for 22 hours. Then it was dried at 80°C for 24 hours, and then put into a high...

Embodiment 3

[0042] Take Na 2 CO 3 、 Bi 2 o 3 and TiO 2 As the raw material, mix according to the molar ratio of Na, Bi, Ti element 1:1:2, put the prepared raw material into the ball mill and mix and ball mill by wet ball milling method. The ball milling medium is zirconia balls and absolute ethanol, and they are mixed and ball milled for 24 hours. Then it is baked at 90°C for 20 hours and then put into a high-temperature furnace for pre-calcination. The pre-calcination process is to raise the temperature to 900°C at a rate of 4°C / min at room temperature, keep it for 2 hours, and cool naturally with the furnace to obtain Na 0.5 Bi 0.5 TiO 3 Powder. BaCO by molar ratio 3 : TiO 2= 1:1 for batching, put the prepared raw materials into the ball mill and use wet ball milling method to mix and ball mill. The ball milling medium is zirconia balls and absolute ethanol, and they are mixed and ball milled for 24 hours. Then it is baked at 90°C for 20 hours and then put into a high-temper...

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Abstract

The invention relates to a dielectric material for a high dielectric constant X8R type multilayer ceramic capacitor and a preparation method thereof. The chemical formula of the material is 0.9BaTiO3‑0.1Na0.5Bi0.5TiO3‑0.02Nb2O5‑xM2O3 (M=Mn, Fe, In) , where x=0.003~0.006. The preparation method is as follows: 1) preparing Na0.5Bi0.5TiO3 powder; 2) preparing BaTiO3 powder; 3) mixing the ingredients according to the stoichiometric ratio of metal elements, putting the raw materials into a ball mill, mixing ball milling by wet ball milling, and drying obtaining ceramic powder; 4) grinding, granulating, sieving and dry pressing the ceramic powder to obtain a ceramic green body; 5) debinding and sintering the ceramic green body to obtain the ceramic powder. The dielectric ceramic material prepared by the invention has good dielectric constant wide temperature stability, high dielectric constant and low dielectric loss.

Description

technical field [0001] The invention belongs to the technical field of dielectric ceramics, in particular to a dielectric material for a high dielectric constant X8R type multilayer ceramic capacitor and a preparation method thereof. Background technique [0002] Multilayer ceramic capacitors are one of the most widely used passive electronic components in the modern electronics industry. As the volume of products continues to decrease, the permittivity per unit volume is also increasing at a rate exceeding Moore's Law. At the same time, due to its characteristic that the permittivity can be kept stable in a wide operating temperature range, it is widely used in civil electronic equipment such as mobile phones and computers, as well as in oil exploration, aerospace, and military fields. [0003] The research of multilayer ceramic capacitors is mainly to develop capacitor dielectric materials with excellent performance, especially to maintain the stability of permittivity in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 刘韩星孙玥张树君郝华曹明贺黄雪琛严海伦
Owner WUHAN UNIV OF TECH