A preparation method of high-dielectric and low-loss insulating copper-calcium titanate ceramics

A technology of calcium copper titanate and low loss is applied in the field of preparation of high dielectric and low loss insulating copper calcium titanate ceramics, which can solve the problems of complicated process, increased cost, etc., to reduce energy consumption, reduce leakage current and dielectric properties. The effect of electrical losses

Active Publication Date: 2012-02-22
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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  • A preparation method of high-dielectric and low-loss insulating copper-calcium titanate ceramics
  • A preparation method of high-dielectric and low-loss insulating copper-calcium titanate ceramics
  • A preparation method of high-dielectric and low-loss insulating copper-calcium 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-mentioned 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; ...

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 preparation method of high-dielectric and low-loss insulating copper-calcium titanate ceramics, belonging to the technical field of high-dielectric ceramic materials. Copper-calcium titanate ceramics use CaCO3 or CaO, CuO and TiO2 as the initial raw materials. The raw materials are mixed and then mixed and ground. The mixed and ground materials are pre-fired at 800°C to 950°C. The pre-fired hard blocks are crushed and then ground. The pre-fired and ground powder is made into a green body with a predetermined shape; the green body is heated from room temperature to a sintering temperature of 960°C-990°C, and kept at the sintering temperature for 1-24 hours to make the ceramic sintered dense. The preparation method of the present invention controls the performance parameters by controlling the process parameters, controlling the structural changes and chemical reactions in the sintering process. The ceramic material prepared by the method can meet the requirements of industrial application. At the same time, compared with the existing technology, the preparation method of the present invention can significantly reduce energy consumption, be environmentally friendly and reduce production costs.

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 Patents(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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