Method for preparing copper calcium titanate ceramic

A technology of copper calcium titanate and ceramics, which is applied in the field of preparation of copper calcium titanate ceramic powder based on the improved co-precipitation method, can solve the problems of difficult control of pH value adjustment and many raw materials, and achieve less impurity phases, simple preparation process, The effect of stable performance

Inactive Publication Date: 2011-05-25
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has more raw materials, and the pH value adjustment is not easy to control

Method used

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  • Method for preparing copper calcium titanate ceramic
  • Method for preparing copper calcium titanate ceramic
  • Method for preparing copper calcium titanate ceramic

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1) 0.1mol tetrabutyl titanate Ti(O 4 h 9 ) 4 Dissolve in 250ml absolute ethanol to make A solution, add 0.2mol oxalic acid H 2 C 2 o 4 2H 2 Dissolve O in 750ml of deionized water to make solution B. The two solutions of A and B are mixed and recorded as HTO solution. A white precipitate is formed after a reaction. Stir with a stirrer to make the solution clear again;

[0030] 2) Add 0.025mol calcium nitrate Ca(NO 3 ) 2 ·H 2 O, 0.075mol copper nitrate Cu(NO 3 ) 2 ·3H 2 Dissolve O together in 1000ml deionized water and dissolve completely to prepare calcium and copper solution C;

[0031] 3) ammonium acetate CH 3 COONH 4 Dissolve in deionized water, prepare 400ml of ammonium acetate solution with a solubility of 1mol / L, as buffer D;

[0032] 4) Slowly add the calcium copper solution C into the HTO solution of the mixed solution of A and B, and at the same time, drop the ammonium acetate solution D evenly, so that the pH value of the reaction solution is kept...

Embodiment 2

[0036] 1) 0.1mol tetrabutyl titanate Ti(O 4 h 9 ) 4 Dissolve in 250ml absolute ethanol to make A solution, add 0.2mol oxalic acid H 2 C 2 o 4 2H 2 Dissolve O in 750ml of deionized water to make solution B. The two solutions of A and B are mixed and recorded as HTO solution. A white precipitate is formed after a reaction. Stir with a stirrer to make the solution clear again;

[0037] 2) Add 0.025mol calcium nitrate Ca(NO 3 ) 2 ·H 2 O, 0.075mol copper nitrate Cu(NO 3 ) 2 ·3H 2 Dissolve O together in 1000ml deionized water and dissolve completely to prepare calcium and copper solution C;

[0038] 3) Dissolve nitric acid-ammonium nitrate in deionized water, prepare 400ml of nitric acid-ammonium nitrate with a solubility of 1mol / L, and add it as buffer D into the stirred and clarified mixed liquid A and B HTO solution.

[0039] 4) Slowly add the calcium copper solution C into the HTO solution of the mixed solution of A and B, and no precipitation is seen. At this time, ...

Embodiment 3

[0043] 1) 0.1mol tetrabutyl titanate Ti(O 4 h 9 ) 4Dissolve in 250ml absolute ethanol to make A solution, add 0.2mol oxalic acid H 2 C 2 o 4 2·H 2 Dissolve O in 750ml of deionized water to make solution B. The two solutions of A and B are mixed and recorded as HTO solution. A white precipitate is formed after a reaction. Stir with a stirrer to make the solution clear again;

[0044] 2) Add 0.025mol calcium nitrate Ca(NO 3 ) 2 ·H 2 O, 0.075mol copper nitrate Cu(NO 3 ) 2 ·3H 2 Dissolve O together in 1000ml deionized water and dissolve completely to prepare calcium and copper solution C;

[0045] 3) ammonium acetate CH 3 COONH 4 Dissolve in deionized water, prepare 400ml of ammonium acetate solution with a solubility of 1mol / L, as buffer D;

[0046] 4) Slowly add the calcium copper solution C into the HTO solution of the mixed solution of A and B, and at the same time drop evenly the ammonium acetate solution D, so that the pH value of the reaction solution is kept ...

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Abstract

The invention discloses a method for preparing copper calcium titanate ceramic, comprising the following steps of: providing aqueous solution of calcium salt and copper salt, and obtaining clear solution by quantitative reaction of tetra-n-butyl titanate and oxalic acid; regulating the pH value of reaction of calcium-copper solution and coprecipitation solution by ammonium acetate so as to be convenient to coprecipitate; and precipitating, separating and drying to obtain superfine proparea powder with less impurity phase and higher purity, and carrying out calcination, granulation, tabletting and sintering at the temperature of 1100 DEG C in air on prodromic powder to obtain the copper calcium titanate ceramic. According to the novel buffer solution and an improved coprecipitation method, the technology is simple, the repeatability of a result is good, and the industrialization is easy. The prepared ceramic has the characteristics that the dielectric constant is high, and the loss is low.

Description

technical field [0001] The invention relates to a method for preparing copper calcium titanate ceramics, in particular to a method for preparing copper calcium titanate ceramic powder based on an improved co-precipitation method with an optimal buffer solution. Background technique [0002] At this stage, due to the strong market demand for miniaturized and highly integrated components, the application of high dielectric constant materials to ceramic capacitors has become a hot spot at present. [0003] At present, the widely used barium titanate-based series is a ferroelectric ceramic material with a dielectric constant greater than 1000. Its biggest feature is that the volume of the capacitor can be made very small. However, its disadvantages are many. The dielectric constant varies nonlinearly with temperature, and also has a nonlinear relationship with the applied external electric field, which causes its capacity to change in a wide range. In addition, the phase of ferr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 李建英顾访吴珍华李盛涛
Owner XI AN JIAOTONG UNIV
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