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Group VB doping CaCu3Ti4O12 based pressure sensitive material and preparation method

A technology of cacu3ti4-xbxo12 and varistor materials, which is applied in the field of VB group element-doped CaCu3Ti4O12-based varistor materials and its preparation, can solve the problems of large leakage current and low voltage gradient, and achieves reduction of intrinsic conductance, improvement of voltage gradient, The effect of reducing leakage current

Inactive Publication Date: 2012-12-26
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the problems of low voltage gradient and large leakage current of current CCTO varistors, the present invention provides a composition and preparation method of CCTO-based varistors modified with VB group elements

Method used

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  • Group VB doping CaCu3Ti4O12 based pressure sensitive material and preparation method
  • Group VB doping CaCu3Ti4O12 based pressure sensitive material and preparation method
  • Group VB doping CaCu3Ti4O12 based pressure sensitive material and preparation method

Examples

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Effect test

Embodiment 1

[0018] Analytical grades of calcium carbonate, copper oxide, titanium dioxide and niobium pentoxide, stoichiometrically CaCu 3 Ti 3.8 Nb 0.2 o 12 ingredients. The prepared materials are put into a ball mill and mixed according to the ratio of zirconia balls:materials at 10:1, and no other medium is added during the mixing process. The ball milling time is 7 hours, the rotating speed is 400 rpm, and the mixed material briquettes are pre-fired at 900° C. for 2 hours. Take out the calcined material and grind it, then pass through a 40-mesh sieve after ball milling for 7 hours, the ball milling speed is 400 rpm; add the powder with 32% deionized water, 1.2% polyacrylic acid ammonia dispersant and A polyvinyl alcohol binder with a mass ratio of 8%, is mixed uniformly by ball milling for 2 hours to form a slurry, the ball milling speed is 100 rpm, and air spray is used to granulate; the powder particles are put into a press, Obtain a disc with a diameter of 15mm and a thickness...

Embodiment 2

[0020] Analytical grades of calcium carbonate, copper oxide, titanium dioxide and vanadium pentoxide, stoichiometrically CaCu 3 Ti 3.6 V 0.4 o 12 ingredients. The prepared materials are put into a ball mill and mixed according to the ratio of agate balls:materials at 15:1, and no other medium is added during the mixing process. The ball milling time is 10 hours, the rotating speed is 400 rpm, and the mixed material briquettes are pre-fired at 950° C. for 2 hours. Take out the calcined material and grind it, and pass through a 40-mesh sieve after ball milling for 10 hours. The ball milling speed is 400 rpm; the powder is added with 20% by mass ratio of deionized water, 1.8% by mass ratio of polyacrylic acid ammonia dispersant and A polyvinyl alcohol binder with a mass ratio of 8%, is mixed uniformly by ball milling for 2 hours to form a slurry, the ball milling speed is 150 rpm, and air spray is used to granulate; the powder particles are put into a press, Obtain a disc wi...

Embodiment 3

[0022] Analytical grades of calcium carbonate, copper oxide, titanium dioxide, niobium pentoxide and vanadium pentoxide, stoichiometrically CaCu 3 Ti 3.4 Nb 0.3 V 0.3 o 12ingredients. The prepared materials are put into a ball mill and mixed according to the ratio of alumina balls:materials at 18:1, and no other medium is added during the mixing process. The ball milling time is 12 hours, the rotating speed is 450 rpm, and the mixed material briquettes are pre-fired at 900° C. for 2 hours. Take out the calcined material and grind it, and pass through a 40-mesh sieve after ball milling for 12 hours. The ball milling speed is 450 rpm; add the powder to deionized water with a mass ratio of 40%, polyacrylic acid ammonia dispersant with a mass ratio of 1.8%, and A polyvinyl alcohol binder with a mass ratio of 7%, is mixed uniformly by ball milling for 2 hours to form a slurry, the ball milling speed is 200 rpm, and air spray is used to granulate; the powder particles are put i...

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Abstract

The invention discloses a group VB doping CaCu3Ti4O12 based pressure sensitive material and a preparation method. The general chemical composition formula of the group VB doping CaCu3Ti4O12 based pressure sensitive materia is CaCu3Ti4-xBxO12, wherein B represents one or combination of group VB elements in the periodic table of chemical elements, and x=0.001-1. The preparation method comprises the following steps of compounding calcium carbonate, copper oxide, vanadium pentoxide, niobium pentaoxide and tantalum pentoxide in accordance with the stoichiometric ratio of CaCu3Ti4-xBxO12 (x=0.001-1, and B represents one or combination of group VB elements in the periodic table of chemical elements), ball milling, calcining, secondary ball milling, pelleting, forming, binder removing, high temperature sintering and the like so that Ca, Cu, Ti-O based ceramics with high permittivity and high pressure sensitive feature can be finally prepared. The invention compensates valence changes of copper ions and titanium ions in the sintering process, which can cause low voltage gradient and large leakage current, by partially replacing a +4 Ti element with a +5 element, thereby reducing the intrinsic conductivity of materials and improving the voltage gradient of the materials.

Description

technical field [0001] The invention relates to a VB group element doped CaCu 3 Ti 4 o 12 The invention discloses a base pressure-sensitive material and a preparation method, belonging to the technical field of material preparation. Background technique [0002] The overvoltage level of power system equipment is based on the overvoltage protection level. At present, the important factors restricting the development of UHV AC power transmission and transformation technology in my country are excessive lightning overvoltage and operating overvoltage, which lead to technical bottlenecks and high cost in the development of UHV equipment. The insulation level of power system equipment is based on the overvoltage protection level of the metal oxide arrester. The arrester with excellent protection performance will reduce the lightning overvoltage and operating overvoltage level acting on the equipment, thereby reducing the insulation level of the equipment to reduce The technic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 刘来君吴枚霞方亮杨曌胡长征
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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