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Multilayer sheet type ZnO piezoresistor prepared by chemical method synthesis oxide powder and its manufacturing method

A technology of varistor and oxide powder, applied in varistor core, resistor manufacturing, varistor and other directions, can solve the problems of increased cost, high rejection rate, poor mixing uniformity of added elements, etc.

Inactive Publication Date: 2006-07-12
HENAN JINGUAN WANGMA INFORMATION INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing preparation method is a solid-phase mixing method, which has high sintering temperature, poor mixing uniformity of added elements, and poor consistency of electrical performance parameters, resulting in high scrap rate and increased cost

Method used

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  • Multilayer sheet type ZnO piezoresistor prepared by chemical method synthesis oxide powder and its manufacturing method
  • Multilayer sheet type ZnO piezoresistor prepared by chemical method synthesis oxide powder and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Prepare a 1mol / L additive mixed metal salt solution containing Bi, Sb, Mn, Si, Cr, Co, Ni, Al and other elements according to the ratio in the formula table 1. After fully stirring at 50°C, use the reverse feeding method to add NH 4 HCO 3 -NH 3 ·H 2 O-NH 4 The Ac composite precipitant realizes co-precipitation at a certain pH value. The obtained precipitate is added with an appropriate dispersant, filtered, thoroughly washed, dried at a constant temperature of 110°C, and calcined at 500-700°C for 2.5h to obtain a composite oxide additive powder. Such as figure 1 structure shown, figure 2 The manufacturing method flow shown, and according to the formula table 1, accurately weigh the ZnO powder and the composite oxide additive powder synthesized by chemical method. Put the weighed material into a ball mill and add an appropriate amount of xylene, binder, dispersant and zirconium balls, ball mill for 12 hours to obtain a cast slurry, and then cast a ceramic film tap...

Embodiment 2

[0063] Prepare 1mol / L additive mixed metal ion solution containing Bi, Sb, Mn, Cr, Co and other elements according to the ratio in formula table 2, adjust the pH value of the solution to make a sol, shrink into a gel after aging, and extract After filtering, washing with distilled water and absolute ethanol, drying at 120°C for 2h, and calcining at 500-700°C for 2.5h to obtain the composite oxide additive powder. Such as figure 1 structure shown, figure 2 The manufacturing method flow shown, and according to the formula table 2, accurately weigh the ZnO powder and the compound oxide additive powder synthesized by chemical method, put the weighed material into the ball mill and add appropriate amount of xylene and binder , dispersant and zirconium balls, ball milled for 12 hours to obtain casting slurry, and then cast a ceramic film tape with a thickness of 25 microns, and ten layers of ceramic film tapes are slightly pressed to obtain a film tape with a thickness of about 25...

Embodiment 3

[0066] Prepare 1 mol / L compound oxide mixed metal salt solution containing Zn, Bi, Sb, Mn, Si, Cr, Co, Ni, Al and other elements according to the chemical composition specified in formula table 3, and fully stir at 50°C , using the reverse addition method with NH 4 HCO 3 -NH 3 ·H 2 O-NH 4 The Ac composite precipitant realizes co-precipitation at a certain pH value. Add appropriate dispersant to the obtained precipitate, filter it, thoroughly wash and dry at 110°C, and calcinate at 500-700°C for 2.5h to obtain chemically synthesized compound containing Zn, Bi, Sb, Mn, Si, Cr, Co, Ni , Al and other elements of composite oxide powder. Such as figure 1 structure shown, figure 2The manufacturing method flow shown is to accurately weigh the chemically synthesized composite oxide powder containing Zn and Bi, Sb, Mn, Si, Cr, Co, Ni, Al and other elements, put the weighed material into the ball mill and add An appropriate amount of xylene, binder, dispersant and zirconium ball...

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Abstract

The invention discloses a multilayer slice ZnO voltage-sensitive resistor prepared by synthesizing oxide powder with chemical coprecipitation and sol-gel methods. Wherein, the ZnO ceramic material also contains 3~8% (mole percent) powder additive. This product belongs to 1005 standard, and has nonlinear coefficient alpha larger than 20 and drain current IL less than 2.0ª–A.

Description

technical field [0001] The invention relates to a multilayer chip varistor, in particular to a multilayer chip ZnO varistor prepared by chemically synthesizing oxide powder and a manufacturing method thereof. Background technique [0002] Multilayer chip varistor MLV (multilayer chip varistor) adopts the multilayer structure of chip capacitor (MLCC), which is composed of multiple separate varistors connected in parallel. Compared with, it has the advantages of small size, large flow rate, fast response speed, direct surface mount, etc., successfully solved the problem of low voltage and miniaturization of varistors, and is suitable for the requirements of surface mount technology (SMT). Therefore, MLV It has become a research hotspot and future development direction of varistors. [0003] The microstructure of multilayer chip varistor ceramics, the chemical homogeneity of the individual additives, and their mechanical integrity are key parameters that determine the transien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/112H01C17/00
Inventor 吕呈祥王兰义景志刚杜辉张金秀郑慎飞魏书周王雅琳刘中华
Owner HENAN JINGUAN WANGMA INFORMATION INDAL
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