Method for preparing multiple field sheet type ZnO voltage-sensitive resistor by water base casting process

A varistor, water-based casting technology, applied in the direction of varistor cores, varistors, resistors, etc., can solve the problem of undiscovered multilayer chip ZnO varistors, damage to human health, Deteriorating working conditions and other issues, to achieve the effect of increasing competitiveness, protecting the environment, and high nonlinear coefficient

Inactive Publication Date: 2007-02-28
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xylene and toluene are highly toxic organic solvents, and a large amount of emissions during casting will seriously pollute the environment, deteriorate working conditions, and damage human health
[0006] There are no technical reports on the preparation of multilayer chip ZnO varistors by water-based casting method at home and abroad

Method used

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  • Method for preparing multiple field sheet type ZnO voltage-sensitive resistor by water base casting process
  • Method for preparing multiple field sheet type ZnO voltage-sensitive resistor by water base casting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Accurately weigh various materials according to formula table 1, and prepare pressure-sensitive ceramic powder. Referring to the structure shown in FIG. 1 and the manufacturing method flow shown in FIG. 2 . According to Table 2 of the water-based cast slurry formula, put 40% of the total pressure-sensitive ceramic powder (that is, ZnO ceramic material) into the ball mill, and add 37.95% of the total amount of deionized water and 20% of WB4101 Polyacrylic acid binder, 0.05% Duramax D3005 ammonium polyacrylate dispersant, 2% polyethylene glycol plasticizer and zirconium balls 2 to 4 times the weight of the material, ball milled for 12 hours to obtain water-based casting slurry, Casting out the ceramic membrane band that thickness is 25 microns then, ten layers of ceramic membrane bands press slightly to obtain the film band protective layer a of thickness about 250 micron, on the film band protective layer a, printing weight ratio is 70% silver, 30 The alloy internal ele...

Embodiment 2

[0049] Accurately weigh various materials according to formula table 1, and prepare pressure-sensitive ceramic powder. Referring to the structure shown in FIG. 1 and the manufacturing method flow shown in FIG. 2 . According to Table 3 of the water-based cast slurry formula, put 70% of the total pressure-sensitive ceramic powder into the ball mill, and add 25% of the total amount of deionized water, 3% of WB4101 polyacrylic acid adhesive, 2% D3005 ammonium polyacrylate dispersant and zirconium balls 2 to 4 times the weight of the material, ball milled for 12 hours to obtain a water-based casting slurry, and then cast a ceramic film tape with a thickness of 25 microns, ten layers of ceramic film tape Slightly pressurize to obtain a protective layer a with a thickness of about 250 microns, print an alloy internal electrode b with a weight ratio of 70% silver and 30% palladium on the protective layer a of the film tape, and then print another layer of internal electrode b in a mis...

Embodiment 3

[0055] Accurately weigh various materials according to formula table 4, and prepare pressure-sensitive ceramic powder. The structure shown in FIG. 1 and the manufacturing process flow shown in FIG. 2 . According to Table 5 of the water-based casting slurry formula, put the pressure-sensitive ceramic powder accounting for 60% of the total amount into the ball mill, and add 17% of the total amount of deionized water, 20% of the ammonium polyacrylate binder, 2% polyammonium methacrylate dispersant, 1% polyethylene glycol plasticizer, and zirconium balls 2 to 4 times the weight of the material, ball milled for 12 hours to obtain a water-based casting slurry, and then cast a thickness of 25 Micron ceramic film strips, ten layers of ceramic film strips are slightly pressed to obtain a film strip protective layer a with a thickness of about 250 microns, and an alloy internal electrode b with a weight ratio of 70% silver and 30% palladium is printed on the film strip protective layer ...

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Abstract

The invention relates to a method for using water-based extending method to prepare multilayer ZnO voltage-sensitive resistance. Wherein, it comprises: using water as solvent to prepare water-based extending slurry; mixing ZnO ceramic, adhesive, disperser, and deion water into water-based extending slurry, while the mass percentage of each component is Zno ceramic at 40-70wt%, adhesive at 3-20w%, disperser at 0.05-2wt%, and the left is deion water; then extending the slurry into ceramic film band; plating one layer of inner electrode; layering, and plating another inner electrode alternative with the last layer; repeating until designed layer number; cutting into plates, adhering and sintering. The invention can reduce cost and apply batch production. And the inventive product has small volume and low cost and applies surface mounting technique.

Description

technical field [0001] The invention relates to the preparation technology of a multilayer chip varistor, in particular to a method for preparing a multilayer chip ZnO varistor and the ZnO varistor by a water-based casting method. Background technique [0002] Tape casting has been widely used in the molding process of ceramic materials since its appearance in 1945. Tape casting is to blow the prepared ball-milled ceramic slurry (that is, the suspension of powder, solvent, binder, dispersant, plasticizer and other additives) into the scraper mouth of the casting machine through gas, and the slurry passes through The process of leveling by self-weight on a rotating steel belt or polyester film (PET), then drying and peeling is an important process for preparing single-layer or multi-layer sheet materials, and is widely used in the production of multi-layer ceramic devices or substrates. , Such as: multilayer ceramic capacitor (MLCC, multilayer ceramic capacitor), multilayer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/112H01C7/10H01C17/00
Inventor 王兰义唐国翌
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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