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Method for preparing high dielectric, low-loss and insulating calcium copper titanate ceramics

A technology of copper calcium titanate and low loss, which is applied in the field of preparation of high dielectric and low loss insulating copper calcium titanate ceramics, can solve problems such as cost increase and process complexity, and achieve reduced energy consumption, leakage current and dielectric The effect of electrical loss

Active Publication Date: 2010-03-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Scholars at home and abroad can reduce the leakage current and dielectric loss of CCTO to a certain extent by doping other substances or compounding with other substances, but it will lead to the complexity of the process and the increase of cost.

Method used

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  • Method for preparing high dielectric, low-loss and insulating calcium copper titanate ceramics
  • Method for preparing high dielectric, low-loss and insulating calcium copper titanate ceramics
  • Method for preparing high dielectric, low-loss and insulating calcium copper titanate ceramics

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preparation example Construction

[0022] The preparation method of the high-dielectric and low-loss insulating copper calcium titanate ceramics proposed by the present invention comprises the following steps:

[0023] (1) Preparation and mixing of raw materials:

[0024] Calcium copper titanate ceramics using CaCO 3 or CaO, CuO and TiO 2 is the initial raw material, wherein the mass ratio of each substance is: CaCO 3 :CuO:TiO 2 =1:(2.27-2.50):(3.03-3.35) or CaO:CuO:TiO 2 =1:(4.05-4.48):(5.42-5.99);

[0025] The above raw materials are mixed according to the above mass ratio for 2-24 hours and then dry-milled, or mixed and wet-milled for 2-24 hours, and dried;

[0026] (2) Calcination and grinding: If the raw material is CaO, this step can also be omitted,

[0027] Pre-burn the above mixed and ground materials at 800°C to 950°C for 2-24 hours, cool with the furnace, crush the hard blocks after pre-burning and grind for more than 2-24 hours, or after wet grinding for 2-24 hours, dry and sieve;

[0028] (...

Embodiment 1

[0035] (1) Preparation and mixing of raw materials:

[0036] The CCTO material uses CaO, CuO, TiO 2 As the initial raw material, the mass ratio of each raw material is CaO:CuO:TiO 2 =1:4.26:5.71.

[0037] The raw materials were dry-milled in a ball mill jar for 24 hours.

[0038] (2) Calcination and grinding:

[0039] The dried material was placed in a high-temperature electric furnace, and pre-fired at 900 degrees Celsius for 2 hours. Cool in the furnace.

[0040] The powder agglomerates after pre-firing. Crush the hard block after pre-burning and place it in a ball mill jar, and grind for 24 hours with alcohol as the grinding medium. The ground slurry is placed in a drying oven for drying, and passed through a 200-mesh sieve after drying.

[0041] (3) Molding:

[0042] Using tablet molding process. Hand granulation was performed using 3% PVA (polyvinyl alcohol) aqueous solution as a binder. Using a hydraulic press and a cylindrical mold with a diameter of 11.5 mm, ...

Embodiment 2

[0051] (1) Preparation and mixing of raw materials:

[0052] The CCTO material uses CaCO 3 , CuO, TiO 2 As the initial raw material, the proportioning is carried out according to the formation of pure phase CCTO. The mass ratio of each raw material is CaCO 3 :CuO:TiO 2 =1:2.385:3.193.

[0053] The raw materials were placed in a ball mill jar and mixed with alcohol as the grinding medium for 12 hours. The ball-milled slurry is placed in a drying oven for drying.

[0054] (2) Calcination and grinding:

[0055] The dried material was placed in a high-temperature electric furnace, and pre-fired at 900 degrees Celsius for 4 hours. Cool in the furnace.

[0056]The powder agglomerates after pre-firing. Crush the hard block after pre-burning and place it in a ball mill jar, and grind for 12 hours with alcohol as the grinding medium. The ground slurry is placed in a drying oven for drying, and passed through a 200-mesh sieve after drying.

[0057] (3) Molding:

[0058] Usin...

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Abstract

The invention relates to a method for preparing high dielectric, low-loss and insulating calcium copper titanate ceramics, belonging to the technical field of high dielectric ceramic materials. The calcium copper titanate ceramics are prepared from initial raw materials of CaCO3 or CaO, CuO and TiO2, wherein after being mixed, the raw materials are processed by mix grinding and then processed by presintering at the temperature from 800 DEG C to 950 DEG C after mix grinding, hard blocks after presintering are cracked to be ground, and the powdered materials after presintering and grinding are prepared into green bodies with predetermined shapes; and the green bodies are heated to the sintering temperature ranging from 960 DEG C to 990 DEG C from room temperature, and heat preservation is carried out for 1 to 24 hours at the sintering temperature, thereby realizing the sintering densification of the ceramics. The preparation method controls performance parameters by controlling technological parameters, and structural changes and chemical reactions in a sintering process. The ceramic materials prepared by the method can meet the requirement on industrial application; and simultaneously, compared with the prior art, the preparation method can obviously reduce the energy consumption, is environment-friendly and reduces the production cost.

Description

technical field [0001] The invention relates to a preparation method of high-dielectric and low-loss insulating copper-calcium titanate ceramics, belonging to the technical field of high-dielectric ceramic materials. Background technique [0002] Calcium copper titanate, whose chemical formula is CaCu 3 Ti 4 o 12 (hereinafter referred to as CCTO), is a new type of functional ceramic material that has attracted widespread attention recently. In 2000, CCTO was found to have a very large relative permittivity, and immediately became one of the research hotspots in the academic circle. People have conducted in-depth research on its structure and mechanism, and explored various aspects to improve its performance. [0003] The high dielectric properties of this material enable it to be used in a series of high-tech fields such as high dielectric capacitors, thin film devices, and high-density energy storage. [0004] However, some properties of CCTO hinder its application in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/462
Inventor 何金良雒风超胡军曾嵘陈水明
Owner TSINGHUA UNIV
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