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Preparation method of bismuth titanate-calcium niobate solid solution high-frequency dielectric ceramics

A technology of dielectric ceramics and calcium niobate, applied in the field of high-frequency thermal compensation capacitor ceramics and high-frequency thermally stabilized capacitor ceramic materials, can solve the problems of high dielectric loss, low dielectric constant, and high sintering temperature, and achieve dielectric properties. Good, high dielectric constant, low sintering temperature

Active Publication Date: 2019-11-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bismuth titanate-calcium niobate solid solution high-frequency dielectric ceramics prepared by the current process have defects such as low dielectric constant, high dielectric loss, and high sintering temperature.

Method used

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  • Preparation method of bismuth titanate-calcium niobate solid solution high-frequency dielectric ceramics
  • Preparation method of bismuth titanate-calcium niobate solid solution high-frequency dielectric ceramics
  • Preparation method of bismuth titanate-calcium niobate solid solution high-frequency dielectric ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Weigh the raw material according to the stoichiometric ratio of the chemical formula, the stoichiometric ratio is Bi 2 o 3 :CaCO 3 :Nb 2 o 5 :TiO 2 =0.7:0.3:0.3:0.7;

[0036] 2) Place the weighed raw materials in a ball mill tank for a ball mill, and place the mixed slurry in a constant temperature drying oven to dry;

[0037] 3) Put the dried mixed powder into the crucible, and carry out pre-synthesis at an appropriate high temperature, and the pre-synthesis temperature is 850°C;

[0038] 4) After the pre-synthesized powder is coarsely pulverized, perform secondary ball milling, and dry the finely pulverized slurry in a constant temperature drying box;

[0039] 5) adding an appropriate amount of PVA to the dried powder for granulation; and then pressing it into a thin disc green body;

[0040] 6) Place the wafer blank in a box-type high-temperature electric furnace for debonding, and then cool naturally with the furnace;

[0041] 7) Place the debonded green ...

Embodiment 2

[0044] 1) Weigh the raw material according to the stoichiometric ratio of the chemical formula, the stoichiometric ratio is Bi 2 o 3 :CaCO 3 :Nb2 o 5 :TiO 2 =0.6:0.4:0.4:0.6;

[0045] 2) Place the weighed raw materials in a ball mill tank for a ball mill, and place the mixed slurry in a constant temperature drying oven to dry;

[0046] 3) Put the dried mixed powder into the crucible, and carry out pre-synthesis at an appropriate high temperature, and the pre-synthesis temperature is 850°C;

[0047] 4) After the pre-synthesized powder is coarsely pulverized, perform secondary ball milling, and dry the finely pulverized slurry in a constant temperature drying box;

[0048] 5) adding an appropriate amount of PVA to the dried powder for granulation; and then pressing it into a thin disc green body;

[0049] 6) Place the wafer blank in a box-type high-temperature electric furnace for debonding, and then cool naturally with the furnace;

[0050] 7) Place the debonded green bo...

Embodiment 3

[0053] 1) Weigh the raw material according to the stoichiometric ratio of the chemical formula, the stoichiometric ratio is Bi 2 o 3 :CaCO 3 :Nb 2 o 5 :TiO 2 =0.5:0.5:0.5:0.5;

[0054] 2) Place the weighed raw materials in a ball mill tank for a ball mill, and place the mixed slurry in a constant temperature drying oven to dry;

[0055] 3) Put the dried mixed powder into the crucible, and carry out pre-synthesis at an appropriate high temperature, and the pre-synthesis temperature is 850°C;

[0056] 4) After the pre-synthesized powder is coarsely pulverized, perform secondary ball milling, and dry the finely pulverized slurry in a constant temperature drying box;

[0057] 5) adding an appropriate amount of PVA to the dried powder for granulation; and then pressing it into a thin disc green body;

[0058] 6) Place the wafer blank in a box-type high-temperature electric furnace for debonding, and then cool naturally with the furnace;

[0059] 7) Place the debonded green ...

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Abstract

The invention discloses a preparation method of bismuth titanate-calcium niobate solid solution high-frequency dielectric ceramic. The preparation method aims at enabling the prepared bismuth titanate-calcium niobate solid solution high-frequency dielectric ceramic to have advantages of high dielectric constant, low dielectric loss, low sintering temperature and wide ceramic forming temperature range, and the ceramic is low in cost, environmentally friendly and pollution-free. The technical scheme adopted by the invention is as follows: 1) weighing raw materials according to the chemical metering ratio in (1-x)Bi2Ti2O7-xCa2Nb2O7; 2) subjecting the raw materials to ball milling, drying and then pre-synthesizing; 3) subjecting the pre-synthesized powder to coarse crushing, secondary ball milling and drying; 4) granulating the dried powder, and then pressing the dried powder into a thin round sheet blank; 5) performing high-temperature adhesive discharging on the thin round sheet blank, and naturally cooling the sheet blank; 6) subjecting the thin round sheet blank to sintering at high temperature and naturally cooling after high-temperature adhesive discharging is carried out.

Description

technical field [0001] The invention relates to a high-frequency heat compensation capacitor porcelain and a high-frequency heat stable capacitor porcelain material, in particular to a preparation method of a bismuth titanate-calcium niobate solid solution high-frequency dielectric ceramic. Background technique [0002] With the rapid development of modern industry, especially the promotion and application of large-scale integrated circuits and the development of surface mount technology (SMT), the requirements for materials are becoming more and more miniaturized, high-precision, and environmentally friendly. As an important part of functional electronic materials, ceramic dielectric materials are widely used in various components, such as capacitors, resonators, filters, circuit substrates, integrated circuits, etc. [0003] Because of its low sintering temperature, high dielectric constant, good combination with silver electrodes, good compactness of sintered ceramics, ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/475C04B35/622C04B35/626C04B35/64
CPCC04B35/475C04B35/622C04B35/6261C04B35/62645C04B35/64C04B2235/3208C04B2235/3251C04B2235/96
Inventor 董思远樊小健高勇王晓莉
Owner XI AN JIAOTONG UNIV
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