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Method for preparing high-gradient, high-dielectric and low-loss pressure-sensitive material

A pressure-sensitive material, high dielectric technology, applied in the preparation of high-gradient, high-dielectric and low-loss CCTO-based pressure-sensitive materials, high-gradient, high-dielectric and low-loss pressure-sensitive materials, can solve the problems of limited applications, Achieve the effects of reducing dielectric loss, increasing grain boundary resistance, and increasing voltage gradient

Inactive Publication Date: 2010-12-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Secondly, the varistor voltage gradient of CCTO is only about 30V / mm, and the small varistor voltage limits its application as a varistor protection device in the high voltage field.

Method used

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  • Method for preparing high-gradient, high-dielectric and low-loss pressure-sensitive material
  • Method for preparing high-gradient, high-dielectric and low-loss pressure-sensitive material
  • Method for preparing high-gradient, high-dielectric and low-loss pressure-sensitive material

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preparation example Construction

[0021] The preparation method of the high-gradient, high-dielectric and low-loss pressure-sensitive material proposed by the present invention comprises the following steps:

[0022] (1) Preparation and mixing of raw materials:

[0023] CaCO 3 or CaO, CuO, TiO 2 And PbO is raw material, and the mass ratio of each raw material is:

[0024] CaCO 3 :CuO:TiO 2 :PbO=1:(2.27~2.50):(3.03~3.35):(0.1~0.85), or CaO:CuO:TiO 2 :PbO=1:(4.05~4.48):(5.42~5.99):(0.18~1.52);

[0025] After weighing each raw material according to the above mass ratio, place it in a ball mill tank and mix and grind for 10 to 24 hours;

[0026] (2) Calcination and grinding:

[0027] The mixed and ground material is pre-fired at 800°C to 900°C for 2 to 12 hours, and cooled with the furnace;

[0028] Crush the pre-calcined material, put it in a ball mill tank and grind it with alcohol as the grinding medium for 12-24 hours, put the ground slurry in a drying oven to dry, and pass through a 100-200 mesh sieve...

Embodiment 1

[0035] According to the preparation method of the present invention, the actual preparation of high-gradient, high-dielectric and low-loss CCTO-based varistor ceramics is carried out. The varistor voltage gradient of the material prepared according to this process is about 300V / mm.

[0036] (1) Preparation and mixing of raw materials:

[0037] 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 :PbO=1:4.26:5.71:0.36.

[0038] The raw materials were dry-milled in a ball mill jar for 24 hours.

[0039] (2) Calcination and grinding:

[0040] 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.

[0041] 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 ...

Embodiment 2

[0051] According to the preparation method introduced in the present invention, the actual preparation of high-gradient, high-dielectric and low-loss CCTO-based varistor ceramics is carried out. The varistor voltage gradient of the material prepared according to this process is about 100V / mm.

[0052] (1) Preparation and mixing of raw materials:

[0053] The CCTO material uses CaCO 3 , CuO, TiO 2 As the initial raw material, the mass ratio of each raw material is CaCO 3 :CuO:TiO 2 :PbO=1:2.385:3.193:0.1.

[0054] 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.

[0055] (2) Calcination and grinding:

[0056] 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.

[0057]The powder agglomerates after pre-firing. Crush the hard block after pre-burning and place it ...

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Abstract

The invention relates to a method for preparing a high-gradient, high-dielectric and low-loss pressure-sensitive material, belonging to the technical field of a high dielectric ceramic material. The method utilizing CaCO3 or CaO, CuO, TiO2 and PbO as raw materials comprises the following steps: weighting and placing the raw materials in a ball milling pot for mixed milling; presintering the mixedly-milled materials and then cooling along with a furnace; scraping the presintered materials, placing in the ball milling pot, grinding by utilizing alcohol as a grinding medium, drying, and adopting a tabletting and forming process to prepare the powder material into a green body with required shape and strength; and sintering the green body under the air atmosphere to compact the sintered ceramics. In the method, PbO is distributed on the grain boundary of CCTO, crystal grain size is effectively reduced, and grain boundary resistance is increased, thus lowering dielectric loss and improving voltage gradient.

Description

technical field [0001] The invention relates to a preparation method of a high-gradient, high-dielectric and low-loss pressure-sensitive material, in particular to a preparation method of a high-gradient, high-dielectric and low-loss CCTO-based pressure-sensitive material, belonging to the technical field of high-dielectric ceramic materials. Background technique [0002] Calcium copper titanate, chemical formula CaCu 3 Ti 4 o 12 (hereinafter referred to as CCTO) is a new type of ceramic material, which has received extensive attention because it was found to have a large dielectric constant in 2000. Due to its giant dielectric properties and pressure-sensitive properties, CCTO can be used in a series of high-tech fields such as pressure-sensitive protective devices, high-dielectric capacitors, thin-film devices, and high-density energy storage. [0003] However, some properties of CCTO hinder its application in industrial production. First, the leakage current of CCTO i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 雒风超何金良胡军
Owner TSINGHUA UNIV
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