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Preparation method of modified BaO-TiO2-Sm2O3 dielectric ceramic

A technology of bao-tio2-sm2o3 and dielectric ceramics, which is applied in the field of preparation of modified BaO-TiO2-Sm2O3 dielectric ceramics, can solve the problems of high sintering temperature of dielectric ceramics, achieve lower sintering temperature, better interaction and increase The effect of high sintered density

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

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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 -Sm 2 o 3 The preparation method of dielectric ceramics solves the existing BaO-TiO 2 -Sm 2 o 3 The problem of high sintering temperature of dielectric ceramics

Method used

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  • Preparation method of modified BaO-TiO2-Sm2O3 dielectric ceramic

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Embodiment 1

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

[0022] (1) Take BaO, TiO 2 、Sm 2 o 3 and modifier, wet ball milling for 10 hours, the ball milling medium is distilled water, dried after ball milling; the modifier is MnO with a molar ratio of 1:1:2 2 , MgO and WO 3 Composition; the BaO, TiO 2 、Sm 2 o 3 The molar ratio with modifier is 1:1:1:0.014;

[0023] (2) The mixed powder after the drying of the ball mill is uniformly mixed with PVA and pressed into shape, and the pressure of the shape is 95 MPa; the weight ratio of the mixed powder to the binder is 100:25;

[0024] (3) Sintering in the atmospheric atmosphere after pressing and forming, the sintering temperature is 965 ° C, and the heat preservation is 4 hours;

[0025] (4) Annealing, the annealing temperature is 840 ° C, the time is 4 hours, and the modified BaO-TiO is obtained 2 -Sm 2 o 3 Dielectric ceramics.

[0026] Pe...

Embodiment 2

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

[0031] (1) Take BaO, TiO 2 、Sm 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 1:1:2 2 , MgO and WO 3 Composition; the BaO, TiO 2 、Sm 2 o 3 The molar ratio with modifier is 1:1:1:0.008;

[0032] (2) The mixed powder after the drying of the ball mill is uniformly mixed with PVA and pressed into shape, and the pressure of the shape is 90 MPa; the weight ratio of the mixed powder to the binder is 100:30;

[0033] (3) Sintering in the atmospheric atmosphere after pressing and forming, the sintering temperature is 950 ° C, and the heat preservation is 5 hours;

[0034] (4) Annealing, the annealing temperature is 820 ° C, the time is 5 hours, and the modified BaO-TiO is obtained 2 -Sm 2 o 3 Dielectric ceramics.

[0035] Va...

Embodiment 3

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

[0039] (1) Take BaO, TiO 2 、Sm 2 o 3 and modifier, wet ball milling for 15 hours, the ball milling medium is distilled water, dried after ball milling; the modifier is MnO with a molar ratio of 1:1:2 2 , MgO and WO 3 Composition; the BaO, TiO 2 、Sm 2 o 3 The molar ratio of modifier and modifier is 1:1:1:0.020;

[0040] (2) After the mixed powder dried by the ball mill is uniformly mixed with paraffin, it is pressed into shape, and the pressure of the shape is 100 MPa; the weight ratio of the mixed powder to the binder is 100:15;

[0041] (3) Sintering in the atmospheric atmosphere after pressing and forming, the sintering temperature is 980 ° C, and the heat preservation is 3 hours;

[0042] (4) Annealing, the annealing temperature is 860 ° C, the time is 4 hours, and the modified BaO-TiO is obtained 2 -Sm 2 o 3 Dielectric ceramics....

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Abstract

The invention discloses a preparation method of a modified BaO-TiO2-Sm2O3 dielectric ceramic and belongs to the technical field of functional ceramics. The preparation method of the modified BaO-TiO2-Sm2O3 dielectric ceramic comprises the following steps of in a wet mode ball-milling BaO, TiO2, Sm2O3 and modifier in a medium of distilled water, and then drying the ball-milled powder; uniformly mixing the ball-milled and dried mixed power with bonding agent for press forming; sintering the press-formed powder in the atmosphere at 950-980 DEG C, and keeping the temperature for 3-5 hours; annealing the sintered powder at 820-860 DEG C for 3-5 hours to obtain the modified BaO-TiO2-Sm2O3 dielectric ceramic. As a microwave dielectric ceramic, the modified BaO-TiO2-Sm2O3 dielectric ceramic has afoundation system of BaO-TiO2-Sm2O3, and by means of the modifier doped with specific components, improves the dielectric constant without significant reduction of Q value and meanwhiles achieves adjustability of temperature coefficient of resonance frequency.

Description

technical field [0001] The invention relates to the technical field of functional ceramics, in particular to a modified BaO-TiO 2 -Sm 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 -Sm 2 o 3 Diele...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/622
CPCC04B35/50C04B35/622C04B2235/3206C04B2235/3215C04B2235/3232C04B2235/3258C04B2235/3267
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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