Method for preparing calcium copper titanium oxide compound powder

A calcium-copper-titanium oxide compound technology is applied in the field of preparing calcium-copper-titanium oxide compound powder by a new low-cost chemical method, which can solve the problems of large environmental pollution, high calcination temperature, high raw material cost, etc., and achieves good dispersibility and simplification. Preparation process, uniform effect of ingredients

Inactive Publication Date: 2015-05-20
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of high raw material cost, excessive environmental pollution and excessive calcination temperature in the prior art, the purpose of the present invention is to provide an improved sol-gel method to prepare CaCu 3 Ti 4 o 12 Powder method, the prepared powder has uniform composition, good dispersibility, and relatively pure phase

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  • Method for preparing calcium copper titanium oxide compound powder
  • Method for preparing calcium copper titanium oxide compound powder

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Embodiment 1

[0013] Calcium nitrate and copper nitrate of analytical grade are used for weighing and proportioning in a molar ratio of 1:3, dissolved in ethylene glycol monomethyl ether, and the mass of ethylene glycol monomethyl ether is the mass of analytical pure calcium nitrate and analytical pure copper nitrate 3 times of the sum to obtain a homogeneous solution (solution A). Based on the calcium nitrate added above, measure the corresponding amount of titanium dioxide with a measuring cylinder according to the Ca:Ti molar ratio of 1:4 and dissolve it in liquid A. The volume of liquid A is 3 times the volume of titanium dioxide. Stir fully to make the titanium dioxide evenly dissolved In liquid A, liquid B is formed. Heat liquid B to 70°C and stir while heating at a stirring speed of 100 rpm to completely evaporate the organic solvent until spontaneous combustion occurs. Spontaneous combustion produces a large amount of gas at room temperature, and a powder with good dispersibility i...

Embodiment 2

[0015] Calcium nitrate and copper nitrate of analytical grade are used for weighing and proportioning in a molar ratio of 1:3, dissolved in ethylene glycol monomethyl ether, and the mass of ethylene glycol monomethyl ether is the mass of analytical pure calcium nitrate and analytical pure copper nitrate 8 times of the sum to obtain a homogeneous solution (solution A). Based on the calcium nitrate added above, measure the corresponding amount of titanium dioxide with a measuring cylinder according to the Ca:Ti molar ratio of 1:4 and dissolve it in liquid A. The volume of liquid A is 12 times the volume of titanium dioxide. Stir fully to make the titanium dioxide dissolve evenly In liquid A, liquid B is formed. Heat to 80°C and stir while heating at a stirring speed of 60 rpm to completely evaporate the organic solvent until spontaneous combustion occurs. Spontaneous combustion produces a large amount of gas at room temperature, and a powder with good dispersibility is obtained...

Embodiment 3

[0017] Calcium nitrate and copper nitrate of analytical grade are used for weighing and proportioning in a molar ratio of 1:3, dissolved in ethylene glycol monomethyl ether, and the mass of ethylene glycol monomethyl ether is the mass of analytical pure calcium nitrate and analytical pure copper nitrate 12 times of the sum to obtain a homogeneous solution (solution A). Based on the calcium nitrate added above, according to the Ca:Ti molar ratio of 1:4, use a measuring cylinder to measure the corresponding amount of titanium dioxide and dissolve it in liquid A. The volume of liquid A is 6 times the volume of titanium dioxide. Stir fully to make the titanium dioxide evenly dissolved. In liquid A, liquid B is formed. Heat liquid B to 90°C and stir while heating at a stirring speed of 140 rpm to completely evaporate the organic solvent until spontaneous combustion occurs. Spontaneous combustion produces a large amount of gas at room temperature, and a powder with good dispersibil...

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Abstract

The invention discloses a method for preparing a calcium copper titanium oxide compound powder. The method comprises the following steps: proportioning titanium dioxide, copper nitrate and calcium nitrate according to the stoichiometric proportion of CaCu3Ti4O12, and carrying out solution preparation, heat treatment, pulverization and the like to finally prepare the calcium copper titanium oxide compound powder with uniform composition, favorable dispersity and pure phase. The low-price titanium dioxide is used instead of the high-price isopropyl titanate or tetrabutyl titanate, thereby lowering the production cost. No catalyst is needed in the preparation process, thereby lowering the environmental pressure of the production technique. The holding time is obviously shortened in the calcination process, thereby effectively lowering the energy consumption. The method simplifies the technique for preparing a calcium copper titanium oxide compound powder by a sol-gel process, greatly lowers the cost and reduces the environmental pollution. The prepared CaCu3Ti4O12 powder has the advantages of uniform composition, favorable dispersity and pure phase.

Description

technical field [0001] The invention belongs to the technical field of powder preparation, in particular to a method for preparing calcium-copper-titanium oxide compound powder by a novel low-cost chemical method. Background technique [0002] CaCu with perovskite structure 3 Ti 4 o 12 Has a very large dielectric constant (ε~10 4 -10 6 ) and lower loss (tanδ ~ 0.03), especially in a wide temperature range (100-600K) dielectric constant is almost unchanged. These good comprehensive properties make it possible to be widely used in a series of high-tech fields such as high-density energy storage, thin film devices, high dielectric capacitors and varistors. But to prepare CaCu with good performance 3 Ti 4 o 12 products, there must be CaCu with uniform composition 3 Ti 4 o 12 Powder. However, it is difficult to obtain powders with excellent properties by using traditional ceramic powder preparation methods. Literature "M. S. Islam, W. M. Chance, H. C. Loye , H. J. Pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/624C04B35/626
Inventor 刘来君邓建明刘赛赛方亮李莲靖
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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