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New application and preparation method of copper calcium titanate (CaCu3Ti4O12) (CCTO)

A technology of calcium copper titanate and capacitors, applied in the direction of resistance manufacturing, resistors, electrical components, etc., can solve problems such as limiting the application of CCTO

Inactive Publication Date: 2014-12-03
KUNMING INST OF PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application of CCTO mainly focuses on high-density information storage and high dielectric capacitors, but few people apply it to varistors, which greatly limits the application of CCTO in electronic devices

Method used

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  • New application and preparation method of copper calcium titanate (CaCu3Ti4O12) (CCTO)
  • New application and preparation method of copper calcium titanate (CaCu3Ti4O12) (CCTO)
  • New application and preparation method of copper calcium titanate (CaCu3Ti4O12) (CCTO)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Accurately weigh 3.04g, 7.25g, and 9.71g of calcium carbonate, copper oxide, and titanium dioxide with a purity greater than 99.5% respectively on a precision electronic balance, and mix the weighed raw materials to obtain a mixture.

[0031] (2) The mixture in (1) was placed in a ball milling tank lined with polytetrafluoroethylene, and ball milling was carried out with deionized water as the ball milling medium at a rotational speed of 250 rpm and a ball milling time of 4 hours. Afterwards, the ball-milled slurry was placed in an oven, and dried at 80° C. for 4 hours to obtain a dry powder.

[0032] (3) Put the dry powder obtained by drying in (2) into a solid-phase reaction furnace, and heat it at 950° C. for 4 hours for calcination to obtain a calcined powder. Afterwards, the powder is subjected to secondary ball milling and drying, the steps are the same as (2), and finally a dried and finely ground powder is obtained.

[0033] (4) Add polyvinyl alcohol soluti...

Embodiment 2

[0046] (1) Accurately weigh 3.04g, 7.25g, and 9.71g of calcium carbonate, copper oxide, and titanium dioxide with a purity greater than 99.5% respectively on a precision electronic balance, and mix the weighed raw materials to obtain a mixture.

[0047] (2) The mixture in (1) was placed in a ball mill tank lined with polytetrafluoroethylene for ball milling, using deionized water as the ball milling medium for ball milling at a rotational speed of 300 rpm and a ball milling time of 4 hours. Afterwards, the ball-milled slurry was placed in an oven, and dried at 80° C. for 4 hours to obtain a dry powder.

[0048] (3) Put the dry powder obtained by drying in (2) into a solid-phase reaction furnace, and heat it at 950° C. for 4 hours for calcination to obtain a calcined powder. Afterwards, the powder is subjected to secondary ball milling and drying, the steps are the same as (2), and finally a dried and finely ground powder is obtained.

[0049] (4) Add polyvinyl alcohol solutio...

Embodiment 3

[0057] (1) Accurately weigh 3.04g, 7.25g, and 9.71g of calcium carbonate, copper oxide, and titanium dioxide with a purity greater than 99.5% respectively on a precision electronic balance, and mix the weighed raw materials to obtain a mixture.

[0058] (2) The mixture in (1) was placed in a ball mill tank lined with polytetrafluoroethylene for ball milling, using deionized water as the ball milling medium for ball milling at a rotational speed of 300 rpm and a ball milling time of 4 hours. Afterwards, the ball-milled slurry was placed in an oven, and dried at a temperature of 80° C. for 6 hours to obtain a dry powder.

[0059] (3) Put the dry powder obtained by drying in (2) into a solid-phase reaction furnace, and heat it at 950° C. for 4 hours for calcination to obtain a calcined powder. Afterwards, the powder is subjected to secondary ball milling and drying, the steps are the same as (2), and finally a dried and finely ground powder is obtained.

[0060] (4) Add polyviny...

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Abstract

The invention discloses new application and a preparation method of copper calcium titanate (CaCu3Ti4O12) (CCTO), the copper calcium titanate is used for preparing a capacitor-piezoresistor with the high dielectric constant, low dielectric loss, good dielectric constant frequency stability and high current-voltage nonlinear coefficient. The technical scheme adopts a conventional solid phase sintering and silver sintering process for preparing a simple capacitor-piezoresistor device. Based on an XRD (X-Ray Diffraction) diagram and an SEM (scanning electron microscope) diagram of the material for preparing the variable resistor, the variable resistor is made of a pure phase CCTO, the grain size takes on remarkable differentiation characteristic at two ends, small grains are closely clustered around large grains; the variable resistor forms a stable platform with 105 magnitudes in a 102-106Hz range, the dielectric loss can be kept at the lowest value (about 0.078) in a 103-105Hz range, two circular arcs form an impedance diagram which is equivalent to a series resistor circuit of two RCs (current limiting resistors), the current-voltage nonlinear coefficient of the resistor is 4.5, the breakdown voltage is 50V / mm and the leakage current is 0.267mA. The resistor has good comprehensive electrical properties and is suitable for practical application and promotion from the point of the performance indexes of the resistor.

Description

technical field [0001] The invention relates to the technical field of electronic components, in particular to a calcium copper titanate (CaCu 3 Ti 4 o 12 ) Capacitor-varistor and method for its preparation. technical background [0002] In recent years, the research and development of electronic ceramic materials have made rapid progress, and high-performance electronic ceramic materials occupy a pivotal position in the contemporary high-tech field and national economy. Electronic ceramic materials are the key to the preparation of basic components in the electronic industries such as microelectronics and optoelectronics. They have a large market demand and broad prospects for industrialization. They are an important class of high-tech new materials with fierce international competition. In the advanced ceramics market, electronic ceramics account for 80% of its share, with annual sales of more than 20 billion US dollars, and its consumers are mainly IT companies and sem...

Claims

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Application Information

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IPC IPC(8): H01C7/115H01C17/00C04B35/462C04B35/622
Inventor 曾一明刘裴赖元明
Owner KUNMING INST OF PRECIOUS METALS
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