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Preparation method for copper calcium titanate

A copper calcium titanate and calcium source technology, applied in the field of dielectric ceramic materials, can solve the problems of easy impurity, segregation, and high cost, and achieve the effects of simple operation process, high catalytic activity, and low production cost

Active Publication Date: 2019-05-03
GUANGDONG ROI OPTOELECTRONICS TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid-phase method has the advantages of simple process and low cost, but this method needs to reach a high synthesis temperature, requires high equipment, and is easy to bring impurities; the co-precipitation method has low equipment requirements and high reactivity, but Due to the unequal precipitation rate and solubility product of each ion during the co-precipitation process, the components are not uniform and easy to segregate, reducing the strength of the powder and prone to agglomeration
The sol-gel method is relatively accurate in stoichiometry, easy to modify and dope, but requires a large amount of organic matter as raw materials, and the cost is high

Method used

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  • Preparation method for copper calcium titanate
  • Preparation method for copper calcium titanate
  • Preparation method for copper calcium titanate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 Shown, a kind of preparation method of calcium copper titanate comprises the steps:

[0037] (a), after mixing calcium source, copper source and titanium source, carry out grinding treatment, obtain mixed material;

[0038] (b) performing laser excitation on the mixed material obtained in step (a) under laser irradiation and self-propagating sintering until the mixed material forms black crystals, thus obtaining the calcium copper titanate;

[0039] Wherein, the calcium source, copper source and titanium source are mixed in a molar ratio of calcium, copper and titanium elements of 1:3:4.

[0040] In step (a), the manner of grinding treatment is ball milling for 3 hours at a rotational speed of 200 rad / min.

[0041] The calcium source is calcium oxide; the copper source is copper; the titanium source is titanium dioxide.

[0042] In the step (b), the laser wavelength of the laser irradiation is 980nm.

[0043] In the step (b), the process of laser ir...

Embodiment 2

[0047] A preparation method of calcium copper titanate, comprising the steps of:

[0048] (a), after mixing calcium source, copper source and titanium source, carry out grinding treatment, obtain mixed material;

[0049] (b) performing laser excitation on the mixed material obtained in step (a) under laser irradiation and self-propagating sintering until the mixed material forms black crystals, thus obtaining the calcium copper titanate;

[0050] Wherein, the calcium source, copper source and titanium source are mixed in a molar ratio of calcium, copper and titanium elements of 1:2.8:3.5.

[0051] In step (a), the manner of grinding treatment is to grind for 6 hours at a rotational speed of 100 rad / min.

[0052] The calcium source is calcium carbonate; the copper source is copper oxide; the titanium source is titanium dioxide.

[0053] In the step (b), the laser wavelength of the laser irradiation is 800nm.

[0054] In the step (b), the process of laser irradiation is that ...

Embodiment 3

[0058] A preparation method of calcium copper titanate, comprising the steps of:

[0059] (a), after mixing calcium source, copper source and titanium source, carry out grinding treatment, obtain mixed material;

[0060] (b) performing laser excitation on the mixed material obtained in step (a) under laser irradiation and self-propagating sintering until the mixed material forms black crystals, thus obtaining the calcium copper titanate;

[0061] Wherein, the calcium source, copper source and titanium source are mixed in a molar ratio of calcium, copper and titanium elements of 1:3.5:4.6.

[0062] In step (a), the manner of grinding treatment is to grind for 2 hours at a rotational speed of 300 rad / min.

[0063] The calcium source is calcium chloride; the copper source is copper and copper oxide compounded at a molar ratio of 2:1; the titanium source is titanium dioxide.

[0064] In the step (b), the laser wavelength of the laser irradiation is 1000nm.

[0065] In the step ...

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Abstract

The invention relates to the technical field of dielectric ceramic materials, and in particular relates to a preparation method for copper calcium titanate. The method comprises the following steps: (a) mixing a calcium source, a copper source and a titanium source, and performing grinding treatment to obtain a mixed material; and (b) performing laser excitation on the mixed material obtained in the step (a) under laser irradiation, and performing self-propagating sintering until the mixed material forms a black crystal, so as to obtain the calcium copper titanate, wherein the calcium source,the copper source and the titanium source are mixed according to a molar ratio of calcium to copper to titanium of 1:(2.8-3.5):(3.5-4.6). The preparation method provided by the invention has the advantages of a simple operation process, convenient control, high production efficiency, low production costs, and no added coupling agent, spinning aid, binder, solvent and the like in the synthetic process, and the costs are lower than those of a current method for preparing copper calcium titanate by high-temperature sintering.

Description

technical field [0001] The invention relates to the technical field of dielectric ceramic materials, in particular to a preparation method of calcium copper titanate. Background technique [0002] Calcium copper titanate (CaCu 3 Ti 4 o 12 ) is abbreviated as CCTO, which is a dielectric material with an internal barrier structure. The crystal is a body-centered cubic perovskite structure and belongs to the Im3 (No.204) space group. This is a non-ferroelectric oxide material whose high dielectric constant is semi-independent with respect to frequency and temperature, stable in the temperature range of 100-400K, and does not have BaTiO 3 Quadratic and Z-axis displacements when a ferroelectric phase transition occurs. The high dielectric constant, low dielectric loss, and high thermal stability of CCTO materials make them have great application prospects in the fields of high energy storage density devices, thin film devices, and high dielectric composite materials. [0003...

Claims

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Application Information

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IPC IPC(8): C01G23/00
Inventor 曾和平江梦慈
Owner GUANGDONG ROI OPTOELECTRONICS TECH CO LTD
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