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Method for manufacturing low dielectric loss CaCu3Ti4O12 ceramic

A low dielectric and ceramic technology, applied in the field of preparation of low dielectric loss CaCu3Ti4O12 ceramics, can solve the problems of high dielectric loss of products, high density of ceramic sheets, and imbalanced composition ratio, and achieve low raw material cost and low dielectric constant. High, uniform effect

Inactive Publication Date: 2015-08-26
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a kind of sol-gel method to prepare CaCu in order to solve the technical problems of imbalance of each component ratio in the product and high dielectric loss of the product existing in the existing copper calcium titanate preparation technology. 3 Ti 4 o 12 ceramic approach, can significantly reduce the CaCu 3 Ti 4 o 12 The dielectric loss of ceramics, and the dielectric constant is still at a high level, the gelation time is short, the ceramic sheet has high density, and the grain uniformity is good

Method used

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  • Method for manufacturing low dielectric loss CaCu3Ti4O12 ceramic
  • Method for manufacturing low dielectric loss CaCu3Ti4O12 ceramic
  • Method for manufacturing low dielectric loss CaCu3Ti4O12 ceramic

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Weigh 8.349 g of calcium nitrate, 25.624 g of copper nitrate and 64.876 g of citric acid, and use absolute ethanol as the solvent to completely dissolve the three raw materials, then use nitric acid to adjust the pH value to 2-3, and finally get blue Transparent mixed solution A;

[0030] (2) Measure 48.376 mL of butyl titanate, add an equal volume of absolute ethanol, stir until completely mixed, and obtain a light yellow mixed solution B;

[0031] (3) Put solution A in a magnetic stirrer and keep stirring, then slowly add solution B into solution A (to prevent hydrolysis of butyl titanate) until a transparent mixed solution is formed, then add 2 g of polyethylene glycol to promote into glue;

[0032] (4) Place the mixed solution finally obtained in the above step (3) in a water bath, adjust the temperature to 80°C, and stir at 200 rpm until a blue xerogel is formed;

[0033] (5) Put the obtained blue xerogel in an evaporating dish, adjust the ...

Embodiment 2

[0039] The difference between this example and Example 1 is that the sintering temperature in step (8) is 1080 °C, and the holding time is still 8 h. The grain size of the CCTO ceramic sample obtained in this example is 3-12 μm, and the relative density is 89.2% About; at 1 kHz, tanδ can be reduced to 0.038, and ε' is greatly improved compared with the sample of Example 1.

Embodiment 3

[0041] The difference between this example and Example 1 is that the sintering temperature in step (8) is 1100 °C, and the holding time is still 8 h. The grain size of the CCTO ceramic sample obtained in this example is 4-15 μm, and the relative density is about 90.1%; at 1 kHz, tanδ can be reduced to 0.029, and ε' is slightly improved compared with the sample in Example 2.

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Abstract

The invention discloses a method for manufacturing low dielectric loss CaCu3Ti4O12 ceramic materials by using a sol-gel method and belongs to the technical field of dielectric substances. The method specifically includes the following steps: adopting the sol-gel method, utilizing calcium nitrate, cupric nitrate and butyl titanate as raw materials, utilizing absolute ethyl alcohol as a solvent, utilizing nitric acid to adjust the pH value of the solution, weighing the raw materials according to the proportion to form the sol, then placing the sol into a water bath at the temperature of 80 DEG C, stirring continuously till xerogel is formed, utilizing an electric furnace and a muffle furnace to remove organics, burning and breaking obtained precursor powder, then adding adhesive to conduct grinding and pelleting to obtain a ceramic blank 1 mm in thickness and 12 mm in diameter, placing the blank into a sintering furnace to conduct sintering and keep the temperature, and finally acquiring CaCu3Ti4O12 ceramic samples with high dielectric constant and low dielectric loss. The method is simple in process and easy to operate. The manufactured ceramic samples are compact, uniform, stable in dielectric constant and low in dielectric loss.

Description

technical field [0001] The invention belongs to the technical field of dielectric ceramic synthesis, in particular to a low dielectric loss CaCu 3 Ti 4 o 12 Methods of preparation of ceramics. Background technique [0002] Calcium copper titanate (CaCu 3 Ti 4 o 12 , referred to as CCTO) is the most typical and most representative new type of high dielectric material discovered in recent years. Relatively stable; the crystal structure of CCTO (space group Im3) is centrosymmetric, there is no electric dipole moment, and there will be no ferroelectric-paraelectric phase transition; in addition, CCTO does not contain lead, the preparation process is simple, and the required preparation conditions are relatively relatively "Mild" is very promising to replace traditional dielectric ceramic materials and become a new generation of high dielectric ceramic materials. [0003] However, many research results at home and abroad show that the dielectric loss of CCTO ...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/622
Inventor 孙礼郝文涛王振铎曹恩思张雍家
Owner TAIYUAN UNIV OF TECH
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