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Preparation method of high-dielectric-constant BaO-TiO2-Nd2O3 capacitor ceramic material

A bao-tio2-nd2o3, high dielectric constant technology, applied in the direction of fixed capacitor dielectric, fixed capacitance components, etc., can solve the problems of low dielectric constant, large temperature coefficient of capacitance, etc., to improve the dielectric constant, The effect of reducing the temperature coefficient of capacitance and lowering the sintering temperature

Inactive Publication Date: 2019-04-23
安庆市泽烨新材料技术推广服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are also many scholars in our country who have studied BaO-TiO 2 -Nd 2 o 3 In-depth research has been carried out on ceramics. So far, it has been reported that the highest dielectric constant can reach about 93. There are problems of low dielectric constant and large temperature coefficient of capacitance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This embodiment provides a high dielectric constant BaO-TiO 2 -Nd 2 o 3 The preparation method of capacitor ceramic material comprises the following steps:

[0021] (1) Take BaO, TiO 2 、Nd 2 o 3 and modifying agent, mixed for 10 hours by wet ball milling, the ball milling medium is distilled water, and dried after ball milling; the BaO, Nd 2 o 3 and TiO 2 The molar ratio of the modifier is 1:1:5.35, and the addition amount of the modifier is BaO, Nd 2 o 3 、TiO 2 6% of the mass sum of the three;

[0022] (2) The mixed powder after the drying of the ball mill is uniformly mixed with PVA and then pressed into shape, the weight ratio of the mixed powder to the binder is 100:25, and the pressure of the pressed shape is 95MPa;

[0023] (3) After pressing and forming, pre-fire in the atmosphere, the pre-sintering temperature is 700 ° C, and the temperature is kept for 4 hours;

[0024] (4) The calcined product is then poured in the atmosphere, the sintering tempera...

Embodiment 2

[0029] This embodiment provides a high dielectric constant BaO-TiO 2 -Nd 2 o 3 The preparation method of capacitor ceramic material comprises the following steps:

[0030] (1) Take BaO, TiO 2 、Nd 2 o 3 and modifier, mixed for 12 hours by wet ball milling, the ball milling medium was distilled water, and dried after ball milling; the BaO, Nd 2 o 3 and TiO 2 The molar ratio of the modifier is 1:1:5.25, and the addition amount of the modifier is BaO, Nd 2 o 3 、TiO 2 10% of the mass sum of the three;

[0031] (2) The mixed powder after the drying of the ball mill is uniformly mixed with PVA and then pressed into shape, the weight ratio of the mixed powder to the binder is 100:15, and the pressure of the pressed shape is 100MPa;

[0032] (3) After pressing and forming, pre-fire in the atmosphere, the pre-sintering temperature is 600 ° C, and the temperature is kept for 5 hours;

[0033] (4) The calcined product is then poured in the atmosphere, the sintering temperature...

Embodiment 3

[0038] This embodiment provides a high dielectric constant BaO-TiO 2 -Nd 2 o 3 The preparation method of capacitor ceramic material comprises the following steps:

[0039] (1) Take BaO, TiO 2 、Nd 2 o 3 and modifying agent, mixed for 15 hours by wet ball milling, the ball milling medium is distilled water, and dried after ball milling; the BaO, Nd 2 o 3 and TiO 2 The molar ratio of the modifier is 1:1:5.40, and the addition amount of the modifier is BaO, Nd 2 o 3 、TiO 2 3% of the mass sum of the three;

[0040] (2) The mixed powder after ball mill drying is uniformly mixed with paraffin and then pressed into shape, the weight ratio of the mixed powder to the binder is 100:30), and the pressure of the shape is 90MPa;

[0041] (3) After pressing and forming, pre-fire in the atmosphere, the pre-sintering temperature is 800 ° C, and the temperature is kept for 3 hours;

[0042] (4) Cast the pre-fired product in the atmosphere, the sintering temperature is 1180 ° C, keep...

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Abstract

The invention discloses a preparation method of a high-dielectric-constant BaO-TiO2-Nd2O3 capacitor ceramic material and belongs to the technical field of functional ceramics. The preparation method of the high-dielectric-constant BaO-TiO2-Nd2O3 capacitor ceramic material comprises the following steps of wet-ball-milling, mixing and drying BaO, TiO2, Nd2O3 and modifier; uniformly mixing the ball-milled and dried mixed powder with bonding agent for compression molding; sintering the compression-molded material in the atmosphere; re-sintering the sintered product in the atmosphere at 1130-1180 DEG C, keeping the temperature for 4-8 hours, and cooling the sintered product down to obtain the high-dielectric-constant BaO-TiO2-Nd2O3 capacitor ceramic material. Compared with the prior art, the preparation method of the high-dielectric-constant BaO-TiO2-Nd2O3 capacitor ceramic material takes BaO-Nd2O3-5TiO2 as a base system and introduces excessive TiO2 and dopes in Bi2O3-2TiO2 composite oxides and CeO2 for modification, so that the dielectric constant of the prepared high-dielectric-constant BaO-TiO2-Nd2O3 capacitor ceramic material can be improved, and the dielectric loss and the capacitance temperature coefficient of the high-dielectric-constant BaO-TiO2-Nd2O3 capacitor ceramic material can be reduced.

Description

technical field [0001] The invention relates to the technical field of functional ceramics, in particular to a high dielectric constant BaO-TiO 2 -Nd 2 o 3 The invention relates to a preparation method of capacitor ceramic material. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials that are used as dielectric materials in microwave frequency circuits and perform one or more functions. As a new type of electronic material, microwave dielectric ceramics are used as resonators, filters, dielectric substrates, dielectric antennas, dielectric waveguide circuits, etc. in modern communications, and are widely used in many fields of microwave technology, such as mobile phones, automobiles Telephones, cordless phones, TV satellite receivers, satellite radio, radar, radio remote controls, etc. With the continuous development of low-temperature co-fired ceramic technology, the application prospects of microwave dielectric ceramic materials will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/46C04B35/622C04B35/64H01G4/12
CPCC04B35/46C04B35/622C04B35/64C04B2235/3215C04B2235/3224C04B2235/3229C04B2235/3232C04B2235/3298C04B2235/658H01G4/1218
Inventor 汪泽维
Owner 安庆市泽烨新材料技术推广服务有限公司
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