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IVB-family element modified CaCu3Ti4O12-based pressure-sensitive material and preparation method thereof

A technology of cacu3ti4-xaxo12 and IVB family, which is applied in the field of CaCu3Ti4O12-based varistor materials and its preparation, can solve the problems of poor performance and large leakage current of varistors, reduce intrinsic conductance, reduce leakage current increase, and reduce leakage The effect of current

Inactive Publication Date: 2010-11-10
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to improve the CaCu in the prior art 3 Ti 4 o 12 To solve the problems of poor varistor performance and large leakage current, the invention provides a CaCu modified with group IVB elements 3 Ti 4 o 12 Based on pressure-sensitive materials and preparation methods thereof, the purpose of reducing leakage current and improving pressure-sensitive performance is achieved by substituting part of titanium with IVB group elements

Method used

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  • IVB-family element modified CaCu3Ti4O12-based pressure-sensitive material and preparation method thereof
  • IVB-family element modified CaCu3Ti4O12-based pressure-sensitive material and preparation method thereof
  • IVB-family element modified CaCu3Ti4O12-based pressure-sensitive material and preparation method thereof

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Embodiment 1

[0018] Calcium carbonate with a mass percentage content of 99.0%, copper oxide with a mass percentage content of 99.8%, titanium dioxide with a mass percentage content of 99.0%, and zirconium dioxide with a mass percentage content of 99.0% are used to analyze the pure grade. The stoichiometric ratio is CaCu 3 Ti 3.9 Zr 0.1 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 time of ball milling is 6 hours, the rotating speed is 400 rpm, and the mixed material briquettes are pre-fired at 900°C for 2 hours; 6 hours, through a 40-mesh sieve; add the powder to its mass ratio of 32% pure water, mass ratio of 1.2% polyacrylic acid ammonia dispersant and mass ratio of 8% polyvinyl alcohol binder, and mix for 2 hours by ball milling The slurry is uniformly formed, the ball milling speed is 100 rpm, and the airflow spray granulation is adop...

Embodiment 2

[0020] Calcium carbonate with a mass percentage content of 99.0% of the analytically pure grade, copper oxide with a mass percentage content of 99.8%, titanium dioxide with a mass percentage content of 99.0%, and hafnium dioxide with a mass percentage content of 99.0%, the stoichiometric ratio is CaCu 3 Ti 3.6 f 0.4 o 12 ingredients. The prepared materials are put into a ball mill and mixed according to the ratio of zirconia balls:materials at 15:1, and no other medium is added during the mixing process. The time of ball milling is 12 hours, the rotating speed is 300 rpm, and the mixed material briquette is pre-fired at 1000°C for 2.5 hours; After 12 hours, pass through a 40-mesh sieve; add the powder to 25% by mass of pure water, 1.8% by mass of polyacrylic acid ammonia dispersant and 6% by mass of polyvinyl alcohol binder, and mix by ball milling for 1 hour The slurry is uniformly formed, the ball milling speed is 250 rpm, and the airflow spray granulation is adopted; th...

Embodiment 3

[0022]Calcium carbonate with an analytically pure grade content of 99.0% by mass, copper oxide with a mass percentage of 99.8%, titanium dioxide with a mass percentage of 99.0%, zirconia with a mass percentage of 99.0%, and 99.0% by mass Hafnium dioxide, stoichiometric to CaCu 3 Ti 3.2 Zr 0.4 f 0.4 o 12 ingredients. The prepared materials are put into a ball mill and mixed according to the ratio of zirconia balls:materials at 6:1, and no other medium is added during the mixing process. The time of ball milling is 10 hours, the rotating speed is 400 rpm, and the mixed material briquettes are pre-fired at 1150°C for 1.5 hours; After 10 hours, cross a 40-mesh sieve; add the powder to its mass ratio of 15% pure water, the mass ratio of 0.5% polyacrylic acid ammonia dispersant and the mass ratio of 7% polyvinyl alcohol binder, through ball milling for 2 Mix evenly for 1 hour to form a slurry, the ball milling speed is 150 rpm, and the airflow spray granulation is used; the po...

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Abstract

The invention discloses an IVB-family element modified CaCu3Ti4O12-based pressure-sensitive material and a preparation method thereof. The general formula of a chemical composition of the pressure-sensitive material is CaCu3Ti4-xAxO12, wherein A is one or the composition of several of IVB-family elements in the periodic table of chemical elements and is not Ti, and x is equal to 0.002-2. The preparation method comprises the following steps of: proportioning calcium carbonate, copper oxide, titanium dioxide, zirconium dioxide and hafnium dioxide in a stoichiometric ratio of the CaCu3Ti4-xAxO12, wherein, x is equal to 0.002-2; A is one or the composition of several of the IVB-family elements in the periodic table of chemical elements and is not Ti; then carrying out the processes of ball milling, calcining, secondary ball milling, pelleting, shaping, rubber discharging and high-temperature sintering to finally prepare CaCu3Ti4O12-based ceramic with good pressure-sensitive characteristic. The invention effectively improves the pressure-sensitive characteristic of the ceramic, reduces the leakage current thereof, and simplifies the preparation process while holding the high dielectric performance of the pressure-sensitive ceramic, thereby making the ceramic meet commercial demands.

Description

technical field [0001] The invention relates to CaCu modified by group IVB elements 3 Ti 4 o 12 A (CCTO)-based pressure-sensitive material and a preparation method thereof belong to the technical field of material preparation. Background technique [0002] Varistors can be used in electrical and electronic circuits to absorb abnormal overvoltage and protect various components in the circuit or various instruments and equipment used on the circuit. Literature "Luo Shaohua, Wu Cong, Tian Yong, Non-ferroelectric Giant Dielectric Varistor Material CCTO, Progress in Chemistry, 2009, 21(7 / 8): 1603-1610; Luo Shaohua, Research on New Giant Dielectric Varistor Ceramic Material Copper Calcium Titanate Progress, Electric Porcelain Surge Arrester, 2008, (6): 25-30" believes that increasing the dielectric constant of the varistor sheet can significantly improve the uniformity of the potential distribution of the varistor column in the arrester. For example, when the relative dielectr...

Claims

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Application Information

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Patent Type & Authority Applications(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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