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Barium titanate based electric resistor non-linear to voltage and its preparing process

A non-linear resistor, barium titanate technology, applied in the direction of varistor, varistor core, etc., can solve the problems of low capacitance of ring varistor, poor mechanical bending strength, complex sintering process, etc. The effect of reduced manufacturing cost, simplified production process, and low sintering temperature

Inactive Publication Date: 2003-02-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing ring varistors are mainly made of zinc oxide or strontium titanate as the main component. The ring varistor made of zinc oxide as the main component has a low capacitance, and its capacitance is lower than that of the ring varistor with strontium titanate as the main component. The resistance is lower by more than an order of magnitude, so the annular varistor made of zinc oxide as the main component has poor ability to absorb high-frequency noise, and its mechanical bending strength is poor, and it is easy to break when installed and used; it is made of strontium titanate as the main component. The ring-shaped varistor has high capacitance and good mechanical bending strength, and has been widely used in micro-motors to eliminate noise. However, the existing manufacturing technology based on strontium titanate-based voltage nonlinear materials has a high sintering temperature. Generally above 1380°C, and the sintering process is complicated, it must be sintered in a hydrogen-nitrogen mixed gas, and the production cost is high

Method used

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  • Barium titanate based electric resistor non-linear to voltage and its preparing process
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  • Barium titanate based electric resistor non-linear to voltage and its preparing process

Examples

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Embodiment 1

[0024] BaTiO produced by the commercially available oxalic acid method 3 as the principal component, the principal component expression (Ba 1-x Sr x ) m TiO 3 In x=0, and m=0.98, by adding TiO in proportion 2 Realize, with the main component being 100mol%, the addition amount of the first subcomponent, the second subcomponent and the third subcomponent are listed in Table 1, a total of 7 different formulas, each formula weighs the main component and three kinds of subcomponents in proportion Composition, according to the ratio of powder: agate ball: pure water=1: 1.5: 1.5, adopt ball mill to mix and grind for 12 hours, filter out slurry with 200 mesh sieve, add polyvinyl alcohol solution and mix evenly after slurry is baked and dried, pass Granulate with a 60-mesh sieve, the concentration of the polyvinyl alcohol solution is 10%, and the addition of the polyvinyl alcohol solution is 12% of the weight of the dried powder. The above-mentioned granulated powder is molded und...

Embodiment 2

[0035] The main component adopts solid-phase synthesis method to analyze pure BaCO 3 , SrCO 3 ,TiO 2 as the raw material, according to the expression (Ba 0.95 Sr 0.05 ) 0.98 TiO 3 Stoichiometric ratio and considering the purity of raw materials, weigh 1000 grams of the above three raw materials, add 1800 grams of pure water, 2000 grams of agate balls, put them in a 5-liter ball mill jar and mill them for 12 hours to form a slurry, which is baked and dried After passing through a 60-mesh sieve to obtain the mixed and ground raw meal, the raw meal was put into an alumina crucible and placed in a box-type electric furnace for solid-phase synthesis at 1250°C / 2 hours. After the synthesis, it was dry-milled and crushed, and passed through an 80-mesh sieve as the main component. The materials and addition amounts of the three subcomponents are the same as the sample number 101 in Example 1, and the subsequent production steps and test methods refer to Example 1; Table 3 lists th...

Embodiment 3

[0038] According to sample number in embodiment 1, be the component of 101 and the method described in embodiment 1 to make the circular preform sheet of external diameter 12.3mm, internal diameter 7.8mm, thickness 1mm; Comparative sample 108 adopts SrTiO 3 Main component, with the main component as 100mol%, add 2.0mol% TiO 2 , 1.0mol% Nb 2 o 5 , 0.5mol% MnO 2 , 0.5mol% SiO 2 According to the method described in Example 1, an annular preform sheet with an outer diameter of 12.3mm, an inner diameter of 7.8mm and a thickness of 1mm was produced. After the above two kinds of blanks are deglued, take half of them and use the method of Example 1 to carry out sintering and heat treatment, but the sintering temperature of comparative sample 108 is 1380 °C, and the heat treatment temperature is 1000 °C, while the sintering temperature of sample 101 is 1300 °C, and the heat treatment temperature is 1050°C; the other half of the two green sheets after debinding was sintered in a nit...

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Abstract

This invention provides a Ba titanate base voltage nonlinear resistor composed of ceramic material of Ba titanate as the main component added with sintered silver electrodes. A preparation method of the said resistor contains 1) Main components of the synthesis are (Bal-xSrx)m TiO2, in which x=0-0.2, m=0.96-100; 2) The main component is added with proportional weighted additives to be mixed with water to become pulp after balmill 3) The pulp is added with PVA solution to be dried to granulation 4) The granulation powders are processed to blank pieces after dry press 5) The blank pieces are sinerted to semiconductive ceramic plates in a reducbility atmosphere 6) To be heat treated in 900-1100 deg.c 7) Electrode is mounted.

Description

technical field [0001] The invention relates to voltage non-linear resistance technology, in particular to a barium titanate-based voltage non-linear resistance with excellent voltage pulse resistance characteristics and large capacitance and a preparation method thereof. Background technique [0002] The voltage non-linear resistance of the present invention not only has the function of non-linear resistance, but also has the function of capacitor, and can be used to absorb abnormal overvoltage and noise in electronic and electrical equipment. For example, it can be manufactured into a ring-shaped voltage non-linear resistor (hereinafter referred to as a ring varistor), which is applied to a micro-motor. The electrodes of the ring-shaped varistor are welded to the rotor coil of the micro-motor. When the motor is running, the ring-shaped varistor Resistors absorb or eliminate noise and sparks generated between the motor rotor and brushes. The existi...

Claims

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Application Information

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IPC IPC(8): H01C7/115
Inventor 卢振亚
Owner SOUTH CHINA UNIV OF TECH
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