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A method for microwave sintering zinc oxide pressure-sensitive resistor

A varistor, microwave sintering technology, applied in the direction of varistor, varistor core, resistor, etc., can solve the problems of affecting varistor ceramic components, long sintering time, energy waste, etc., to improve product quality. Performance, short sintering time, environmental protection effect

Inactive Publication Date: 2007-05-16
GUANGXI NEW FUTURE INFORMATION IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the power of the sintering furnace for industrial production is generally very large, about 65-100kW and the sintering time is very long (about 20-30h), which not only causes a large amount of waste of energy, but also makes the low-melting point substances in the formula last longer. Time volatilizes, which affects the density and electrical properties of the product, and the low melting point substances that volatilize into the atmosphere will also cause environmental pollution
In addition, the traditional external indirect heating method will also lead to a serious imbalance in the internal and external temperature of the sintered product, which is very unfavorable to ensure the uniformity of the internal structure of the product, and seriously affects the further improvement of the performance of pressure-sensitive ceramic components, especially large-scale components.

Method used

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  • A method for microwave sintering zinc oxide pressure-sensitive resistor
  • A method for microwave sintering zinc oxide pressure-sensitive resistor
  • A method for microwave sintering zinc oxide pressure-sensitive resistor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Example 1: Microwave sintering low voltage zinc oxide varistor

[0081] Follow the steps below to implement:

[0082] a. According to the formula shown in Table 2, the various raw materials are accurately weighed and proportioned, and the traditional manufacturing process is used to ball mill, spray granulate, and press into a low-voltage varistor green body with a specification of 20×1.5mm, and then use the traditional process to discharge glue.

[0083] b. Neatly arrange the degummed green sheets in a certain way in a sintering bowl with mullite as the main raw material, and the number of stacked layers is less than 20. The sintering bowl is sealed and put into the furnace cavity of the microwave sintering furnace, and the cavity wall of the furnace cavity is composed of oxide ceramics or oxide ceramic fibers. 1 represents the microwave sintering temperature curve among the accompanying drawing 2, controls the cavity temperature of the microwave sintering furnace b...

Embodiment 2

[0099] Example 2: Microwave sintering medium and high voltage varistors

[0100] Follow the steps below to implement:

[0101] a. According to the formula shown in Table 4, the various raw materials are accurately weighed and proportioned, and the traditional manufacturing process is used to ball mill, spray granulate, and press into a medium and high voltage varistor green body with a specification of 24×1.2mm, and then use the traditional process Degumming.

[0102] b. Neatly arrange the degummed green sheets in a certain way in a sintering bowl with mullite as the main raw material, and the number of stacked layers is less than 20. The sintering bowl is sealed and put into the furnace cavity of the microwave sintering furnace, and the cavity wall of the furnace cavity is composed of oxide ceramics or oxide ceramic fibers. 1 represents the microwave sintering temperature curve among the accompanying drawings 3, controls the cavity temperature of the microwave sintering fu...

Embodiment 3

[0118] Example 3: Microwave sintering high-energy low-field-strength zinc oxide varistor valve sheet

[0119] Follow the steps below to implement:

[0120] a. Accurately weigh and proportion various raw materials according to the formula shown in Table 6, ball mill, spray granulate, and press into a varistor valve green body with a specification of 105×20mm by traditional manufacturing techniques, and then use traditional Process degumming.

[0121] b. Neatly arrange the degummed green sheets in a certain way in a sintering bowl with mullite as the main raw material, and the number of stacked layers is less than 20. The sintering bowl is sealed and put into the furnace cavity of the microwave sintering furnace, and the cavity wall of the furnace cavity is composed of oxide ceramics or oxide ceramic fibers. 1 represents the microwave sintering temperature curve among the accompanying drawing 4, controls the cavity temperature of the microwave sintering furnace by the microwa...

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Abstract

The related microwave sintering method for piezoresistor comprises: selecting material as ZnO, Bi2O3, TiO2, Co2O3, Ni2O3, Mn (CO3)3 or MnO2; mixing material for blank to put into sintering bowl and together into the microwave furnace; then, heating as 5~50Deg / min till 1000~1300Deg; holding for 5~120min; cooling as 2~50Deg / min to 700~90Deg, and cooling to room temperature and obtain the final product. This invention has supper performance to traditional product, and fit to large-scale industrial production.

Description

technical field [0001] The invention relates to a method for microwave sintering zinc oxide varistors, in particular to a method for microwave sintering low, medium and high voltage zinc oxide varistors. Background technique [0002] Zinc oxide varistor is a ZnO powder base material doped with a small amount of Bi 2 o 3 、Co 2 o 3 , MnCO 3 , Sb 2 o 3 、TiO 2 、Cr 2 o 3 、Ni 2 o 3 It is a fine electronic ceramic component made by mixing, ball milling, molding, sintering and other processes; it has the characteristics of sensitive change of resistance value to external voltage, and is mainly used to identify and limit various transients that may appear in the circuit. State overvoltage, and can absorb surge energy at the same time. [0003] The application fields of ZnO varistors are very wide, such as power systems, industrial power distribution systems, buildings, NEMP protection of aerospace vehicles, military industry, and are still expanding. The ZnO varistor can...

Claims

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Application Information

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IPC IPC(8): H01C7/112H01C17/30
Inventor 孙丹峰彭虎邴绍同林枞
Owner GUANGXI NEW FUTURE INFORMATION IND
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