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Preparation method of two-phase low-temperature co-sintered temperature stable dielectric ceramic material

A temperature-stable, ceramic material technology is applied in the field of preparation of barium titanate-bismuth sodium titanate two-phase low-temperature co-fired dielectric temperature-stable dielectric ceramics, and can solve problems such as increased loss, adverse effects on device performance, and the like, Achieving the effect of large dielectric constant, improved dielectric temperature stability and good dielectric temperature stability

Inactive Publication Date: 2013-10-09
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding sintering aids can reduce the sintering temperature, but the addition of sintering aids will lead to various unfavorable factors that will adversely affect device performance (such as increased loss, etc.)

Method used

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  • Preparation method of two-phase low-temperature co-sintered temperature stable dielectric ceramic material
  • Preparation method of two-phase low-temperature co-sintered temperature stable dielectric ceramic material
  • Preparation method of two-phase low-temperature co-sintered temperature stable dielectric ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Take BaCO 3 and TiO 2 0.2 mol each, mixed ball milling, the ball milling medium is water and zirconia balls, the ball milling speed is 100 r / min, and the time is 4 hours.

[0025] 2. Put the slurry at 100 o Dry at C, grind, put the powder in a crucible and place it in a muffle furnace for calcination, the calcination temperature is 1250 o C, close to the sintering temperature of pure BT body, the calcination time is 4 hours.

[0026] 3. Grind the shrinkage and agglomerated billets to obtain BT billets (powder).

[0027] 4. Take Na 2 CO 3 、 Bi 2 o 3 0.05mol each, TiO 2 Take 0.2 mol, mix and ball mill, the ball milling medium is ethanol and zirconia balls, the ball milling speed is 100r / min, and the ball milling time is 4 hours.

[0028] 5. Put the slurry at 100 o Dry at C, grind, put the powder in a crucible and place it in a muffle furnace for calcination, the calcination temperature is 800 o C, lower than the sintering temperature of the BNT green body, a...

Embodiment 2

[0035] 1. Take BaCO 3 and TiO 2 0.2 mol each, mixed ball milling, the ball milling medium is water and zirconia balls, the ball milling speed is 100 r / min, and the time is 4 hours.

[0036] 2. Put the slurry at 100 o Dry at C, grind, put the powder in a crucible and place it in a muffle furnace for calcination, the calcination temperature is 1250 o C, close to the sintering temperature of pure BT body, the calcination time is 4 hours.

[0037] 3. Grind the shrinkage and agglomerated billets to obtain BT billets (powder).

[0038] 4. Take Na 2 CO 3 、 Bi 2 o 3 0.05mol each, TiO 2 Take 0.2 mol, mix and ball mill, the ball milling medium is ethanol and zirconia balls, the ball milling speed is 100r / min, and the ball milling time is 4 hours.

[0039] 5. Put the slurry at 100 o Dry at C, grind, put the powder in a crucible and place it in a muffle furnace for calcination, the calcination temperature is 800 o C, lower than the sintering temperature of the BNT green body, a...

Embodiment 3

[0048] 1. Take BaCO 3 and TiO 2 0.2 mol each, mixed ball milling, the ball milling medium is water and zirconia balls, the ball milling speed is 100 r / min, and the time is 4 hours.

[0049] 2. Put the slurry at 100 o Dry at C, grind, put the powder in a crucible and place it in a muffle furnace for calcination, the calcination temperature is 1250 o C, close to the sintering temperature of pure BT body, the calcination time is 4 hours.

[0050] 3. Grind the shrinkage and agglomerated billets to obtain BT billets (powder).

[0051] 4. Take Na 2 CO 3 、 Bi 2 o 3 0.05mol each, TiO 2 Take 0.2 mol, mix and ball mill, the ball milling medium is ethanol and zirconia balls, the ball milling speed is 100r / min, and the ball milling time is 4 hours.

[0052] 5. Put the slurry at 100 o Dry at C, grind, put the powder in the crucible and calcined in the muffle furnace, the calcining temperature is 800 o C, the lower the sintering temperature of the BNT green body, the higher the t...

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Abstract

The invention discloses a preparation method of two-phase low-temperature co-sintered temperature stable dielectric ceramic material. The preparation method comprises the steps of: (1) calcining BaCO3 and TiO2 through at a high temperature of 1250 DEG C which is close to the sintering temperature of BaTiO3 ceramic, so as to synthesize BaTiO3; (2) calcinating Na2CO3, Bi2O3 and TiO2 at 800 DEG C to synthesize Na0.5Bi0.5TiO3; (3) evenly mixing (1-x)BaTiO3 and xNa0.5Bi0.5TiO3 together by weight percentage, wherein x is greater than 0.05 and less than 0.2, and the mixer is used as a substrate material; (4) adding y wt% of Y2O3 by weight of the substrate material in the mixing process, wherein y is greater than 0.1 and less than 0.5; and (5) performing washing-out, drying and compression moulding operations on the powder, and sintering at a temperature of 1100-1150 DEG C, so as to obtain a two-phase low-temperature co-sintered ceramic sample piece. According to the preparation method, different from a BT-BNT composite material, a BT-BNT (Bismuth Titanate-Bismuth Na Titanate) mixed two-phase coexistence dielectric material is prepared by a step-by-step solid phase method. The two-phase low-temperature co-sintered temperature stable dielectric ceramic material has the characteristics of low loss and high dielectric constant of BT at a temperature lower than 120 DEG C and BNT at a temperature higher than 120 DEG C. The preparation method is capable of realizing multiphase medium coexistence and co-sintering without adding any sintering aid, and also capable of realizing co-sintering with a metal internal electrode; therefore, a new preparation method of the temperature stable ceramic is realized; and the preparation method has great application value.

Description

technical field [0001] The invention belongs to the preparation of capacitor materials, in particular to a method for preparing a barium titanate-sodium bismuth titanate two-phase low-temperature co-fired dielectric temperature-stable dielectric ceramic. Background technique [0002] Multi-layer ceramic capacitors (Multi-Layer Ceramic Capacitors, MLCCs), as an important electronic component, have been widely used in various electronic products. According to the Electronic Industries Association (EIA) standard, the MLCC compounded with the X7R standard is already the electronic component with the largest demand in the market and the largest amount of electronic products. The X7R standard is 25 o C as a benchmark, from -55 to 125 o C. The temperature capacity change rate (TCC) of the material is ≤ 15%, the dielectric loss (DF) is ≤ 2.5%, and the dielectric constant of the material is generally above 2000. X7R ceramics not only have a relatively stable temperature-dielectric r...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
Inventor 曹万强陈威刘培朝舒明飞尚玉黎
Owner HUBEI UNIV
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