Preparation method of modified BaO-TiO2-La2O3 dielectric ceramics

A technology of bao-tio2-la2o3 and dielectric ceramics, applied in the field of functional ceramics, can solve the problems of high sintering temperature of dielectric ceramics, and achieve the effects of increasing dielectric constant, improving sintering performance and stability, and good interaction

Inactive Publication Date: 2019-03-29
安庆市泽烨新材料技术推广服务有限公司
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  • Claims
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Problems solved by technology

[0005] In view of the above technical problems, the present invention provides a modified BaO-TiO 2 -La 2 o 3 The preparation method of dielectric ceramics solves the existing BaO-TiO 2 -La 2 o 3 The problem of high sintering temperature of dielectric ceramics

Method used

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  • Preparation method of modified BaO-TiO2-La2O3 dielectric ceramics

Examples

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Effect test

Embodiment 1

[0021] This embodiment provides a modified BaO-TiO 2 -La 2 o 3 A method for preparing a dielectric ceramic, comprising the steps of:

[0022] (1) Take BaO, TiO 2 , La 2 o 3 and modifier, wet ball milling for 12 hours, the ball milling medium is distilled water, dried after ball milling; the modifier is MnO with a molar ratio of 2:2:1 2 、WO 3 and Fe 2 o 3 ; The BaO, TiO 2 , La 2 o 3 The molar ratio with modifier is 1:1:1:0.0010;

[0023] (2) After the ball milling, the mixed powder was sintered in the air atmosphere at 860-890°C for 6 hours;

[0024] (3) After adding PVA to the powder obtained in step (2) and granulating, the weight ratio of the powder to the binder is 100:25, and the particle size range of the mixed powder obtained after granulating is 300 mesh, and then Press molding, and finally sintering in the air atmosphere at 940-980°C for 5 hours.

[0025] Among them, the modifier is MnO with a weight ratio of 2:2:1 2 、WO 3 and Fe 2 o 3 .

[0026] The...

Embodiment 2

[0030] This embodiment provides a modified BaO-TiO 2 -La 2 o 3 A method for preparing a dielectric ceramic, comprising the steps of:

[0031] (1) Take BaO, TiO 2 , La 2 o 3 and modifier, wet ball milling for 13 hours, the ball milling medium is distilled water, dried after ball milling; the modifier is MnO with a molar ratio of 2:2:1 2 、WO 3 and Fe 2 o 3 ; The BaO, TiO 2 , La 2 o 3 The molar ratio with modifier is 1:1:1:0.003;

[0032] (2) After ball milling, the mixed powder is sintered in the air atmosphere at 860-890°C for 4 hours;

[0033] (3) After adding paraffin wax to the powder prepared in step (2) and granulating, the weight ratio of the powder to the binder is 100:30, and the particle size range of the mixed powder obtained after granulating is 200 mesh, and then Press molding, and finally sintering in the air atmosphere at 940-980°C for 4 hours.

[0034] Among them, the modifier is MnO with a weight ratio of 2:2:1 2 、WO 3 and Fe 2 o 3 .

[0035] ...

Embodiment 3

[0038] This embodiment provides a modified BaO-TiO 2 -La 2 o 3 A method for preparing a dielectric ceramic, comprising the steps of:

[0039] (1) Take BaO, TiO 2 , La 2 o 3 and modifier, mixed for 14 hours by wet ball milling, the ball milling medium is distilled water, and dried after ball milling; the modifier is MnO with a molar ratio of 2:2:1 2 、WO 3 and Fe2 o 3 ; The BaO, TiO 2 , La 2 o 3 The molar ratio with modifier is 1:1:1:0.015;

[0040] (2) After ball milling, the mixed powder is sintered in the air atmosphere at 860-890°C for 8 hours;

[0041] (3) After adding PVB to the powder prepared in step (2) and granulating, the weight ratio of the powder to the binder is 100:15, and the particle size range of the mixed powder obtained after granulating is 300 mesh, and then Press molding, and finally sintering in the air atmosphere at 940-980°C for 6 hours.

[0042] Among them, the modifier is MnO with a weight ratio of 2:2:1 2 、WO 3 and Fe 2 o 3 .

[0043...

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Abstract

The invention discloses a preparation method of modified BaO-TiO2-La2O3 dielectric ceramics, and belongs to the technical field of functional ceramics. The method comprises the following steps of taking BaO, TiO2, La2O3 and modifying agents, wherein the modifying agent is prepared from MnO2, WO3 and Fe2O3 according to the weight ratio of 2:2:1; performing wet ball milling mixing for more than 12 hours, wherein the ball milling media is distilled water; performing drying after the ball milling; performing sintering on the mixed powder after the ball milling for 4 to 8 hours in atmosphere being860 to 890 DEG C; adding bonding agents into the prepared powder; performing granulation and pressing shaping; finally performing sintering for 4 to 6 hours in atmosphere being 940 to 980 DEG C. The BaO-TiO2-La2O3 is used as a basic system; through doping with the modifying agents with the specific ingredients, the sintering performance and the stability are improved; the sintering temperature islow; the dielectric constant is improved, but the Q value reduction is not obvious; meanwhile, the resonant frequency temperature coefficient is adjustable.

Description

technical field [0001] The invention relates to the technical field of functional ceramics, in particular to a modified BaO-TiO 2 -La 2 o 3 Preparation methods of dielectric ceramics. 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 be better. [0003] BaO-TiO 2 -La 2 o 3 Diele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50
CPCC04B35/50C04B2235/3215C04B2235/3227C04B2235/3232C04B2235/3258C04B2235/3267C04B2235/3272C04B2235/96
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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