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High-temperature pressurizing method for preparing direct-current zinc oxide piezoresistor sheet

A varistor, high temperature pressurization technology, applied in the field of high temperature pressurization method to prepare DC zinc oxide varistor sheets, can solve the problems of formula composition change, violent reaction, easy splashing, etc. Uneven distribution of components throughout, high-quality results

Inactive Publication Date: 2012-11-21
JIANGSU JINLEIKAI PHOTOELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The raw material formula of the resistor generally includes the main material zinc oxide, and additives such as bismuth oxide, cobalt oxide, manganese oxide, boron oxide, etc. The raw materials such as bismuth oxide in the components have a low melting point and are highly volatile at high temperatures , the reaction is violent in the process, and it is easy to splash, which will cause changes in the composition of the formula and pollute the environment. This problem has been difficult to completely improve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The first step: according to molar percentage, the formula consists of the following raw materials:

[0023] Main material ZnO: 91.0%, : 4.2%, Cr 2 o 3 :0.6%, :0.8%, WO 3 : 0.1%, SiO 2 : 0.3%, Fe 2 o 3 : 0.8%, MnO 2 : 1.0%, B 2 o 3 : 1.2%;

[0024] Step 2: After weighing according to the mole percentage of the formula in the first step, use zirconia balls, polyethylene tank, and absolute ethanol to wet-grind in a frequency conversion planetary ball mill for 10 hours, with the speed set at 450rpm, zirconia balls: no Water ethanol: powder mass ratio is 15:3:1, and the slurry after grinding is placed in an oven at 90°C for 15 hours;

[0025] The third step: the dry powder prepared in the third step is dry-milled in a frequency conversion planetary ball mill for 4 hours using zirconia balls and polyethylene tanks, the speed is set to 450rpm, and the mass ratio of zirconia balls: powder is 15: 1;

[0026] Step 4: Add 2% PVA to the powder prepared in the third step...

Embodiment 2

[0032] The first step: according to molar percentage, the formula consists of the following raw materials:

[0033] Main material ZnO: 90.5%, : 4.7%, Cr 2 o 3 :0.6%, :0.7%, WO 3 : 0.1%, SiO 2 : 0.3%, Fe 2 o 3 : 0.8%, MnO 2 : 1.0%, B 2 o 3 : 1.3%;

[0034] Step 2: After weighing according to the mole percentage of the formula in the first step, use zirconia balls, polyethylene tank, and absolute ethanol to wet-grind in a frequency conversion planetary ball mill for 10 hours, with the speed set at 450rpm, zirconia balls: no Water ethanol: powder mass ratio is 15:3:1, and the slurry after grinding is placed in an oven at 90°C for 15 hours;

[0035] The third step: use zirconia balls and polyethylene tanks to dry-mill the dry powder prepared in the second step for 4 hours in a frequency conversion planetary ball mill, set the speed at 450rpm, and the mass ratio of zirconia balls: powder is 15:1 ;

[0036] Step 4: Add 2% PVA to the powder prepared in the third step, mix ...

Embodiment 3

[0042] The first step: according to the molar percentage, the formula is made up of the following raw materials:

[0043] Main material ZnO: 90.4%, : 5.1%, Cr 2 o 3 :0.4%, :0.8%, WO 3 : 0.1%, SiO 2 : 0.3%, Fe 2 o 3 : 0.9%, MnO 2 : 0.8%, B 2 o 3 : 1.2%;

[0044]Step 2: After weighing according to the mole percentage of the formula in the first step, use zirconia balls, polyethylene tank, and absolute ethanol to wet-grind in a frequency conversion planetary ball mill for 10 hours, with the speed set at 450rpm, zirconia balls: no Water ethanol: powder mass ratio is 15:3:1, and the slurry after grinding is placed in an oven at 90°C for 15 hours;

[0045] The third step: use zirconia balls and polyethylene tanks to dry-mill the dry powder prepared in the second step for 4 hours in a frequency conversion planetary ball mill, set the speed at 450rpm, and the mass ratio of zirconia balls: powder is 15:1 ;

[0046] Step 4: Add 2% PVA to the powder prepared in the third step,...

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Abstract

The invention relates to a high-temperature pressurizing method for preparing a direct-current zinc oxide piezoresistor sheet, and belongs to the field of preparation technologies of a voltage-sensitive ceramics resistor sheet. According to the invention, the high-temperature pressurizing method is adopted to prepare the direct-current zinc oxide piezoresistor sheet at a high temperature in an oxidizing atmosphere, the environment under high pressure is used for inhibtting the volatilization of a component with a low melting point, and heat preservation and sintering are carried out in a high temperature environment, so that the overall density of the voltage-sensitive ceramics is improved, voltage-sensitive ceramics bars can be obtained after cooling and can also be cut at will to prepare the resistor sheet with the required thickness. With the adoption of the method provided by the invention, the components with a low melting point can be inhibited to violate under the high pressure during being pressurized at the high temperature, so that the conditions that the design prescription needs to be changed and the distribution of the whole component is nonuniform can be avoided, and high quality of the resistor sheet can be ensured.

Description

technical field [0001] The invention relates to a high-temperature pressurization method for preparing a direct-current zinc oxide varistor sheet, and belongs to the technical field of varistor ceramic resistor sheet preparation. Background technique [0002] Zinc oxide varistor ceramic resistors have excellent voltage-current nonlinearity and are the main components of surge arresters. They are widely used in power transmission systems and electronic circuits to limit the overvoltage of the circuit system, thus playing a good role in the equipment. Protective effects. With the development of the economy, different and complex use environments have put forward higher requirements for resistors. [0003] During use, the varistor sheet will age due to long-term voltage load, the varistor voltage will decrease, and the leakage current will increase. It may even cause the internal temperature of the body to rise until thermal collapse occurs and burst, thereby greatly shortenin...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/622C04B35/645
Inventor 钟庆东花银群杨国平
Owner JIANGSU JINLEIKAI PHOTOELECTRIC TECH
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