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Copper electrode strontium titanate annular piezoresistor and method for making same

A technology of varistors and resistors, applied in the direction of varistors, etc., can solve the problems of unspecified advantages, undisclosed preparation methods of copper electrode strontium titanate ring varistors, etc., and achieve the effect of good welding resistance

Active Publication Date: 2005-06-22
GUANGDONG FENGHUA ADVANCED TECH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 02114902.x and CN 02225950.3 disclose simultaneously that its annular resistance body is made of ZnO, SrTiO 3 、TiO 2 , SiC and SnO 2 One or more of the materials are doped and fired, and its electrodes are made of one or more of Ag, Cu, Au, Al, Ni, Pt, Sn, Zn, In-Ga, Pd and Cd , but it does not specifically specify the use of SrTiO 3 As a ring resistor, the advantages of the Cu electrode over the Ag electrode are not specified, and the preparation method of the copper electrode strontium titanate ring varistor is not disclosed.

Method used

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  • Copper electrode strontium titanate annular piezoresistor and method for making same
  • Copper electrode strontium titanate annular piezoresistor and method for making same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The special ceramic material for strontium titanate ring varistor is made by extrusion molding method to make ring green sheet, and after debinding at 650°C, it is sintered at 1350°C in an atmosphere furnace containing nitrogen and hydrogen mixture After the semiconductor ceramic is produced, it is oxidized at 900°C to obtain a strontium titanate ring varistor ceramic substrate. The copper paste that is 80% (weight percentage composition) with Cu content, glass powder content is 15%, solvent content is 5%, is printed on this substrate by 200 mesh screens, (and dry at 150 ℃) ; and after being reduced in an atmosphere furnace containing nitrogen-hydrogen mixed gas at a temperature of 800 ° C, a copper electrode strontium titanate ring varistor is obtained. The weldability of the ring strontium titanate is better through measurement.

Embodiment 2

[0030] The special ceramic material for strontium titanate ring-shaped varistors is made of ring-shaped blanks by extrusion molding, and after debinding at a temperature of 600 ° C, the semiconductor ceramics are sintered at a temperature of 1200 ° C in a hydrogen atmosphere furnace. , Oxidized at 800 ° C to obtain strontium titanate ring varistor ceramic substrate. It is 70% to contain Cu, the glass powder content is 20%, and the copper paste that solvent content is 10% is printed on this substrate by 180 mesh screens, (and dry at the temperature of 100 ℃); After being reduced in a nitrogen atmosphere furnace at 700°C, a copper electrode strontium titanate annular varistor was obtained, and it was measured that the weldability of the annular strontium titanate was better.

Embodiment 3

[0032] The special ceramic material for strontium titanate ring-shaped varistors is made of ring-shaped blanks by dry pressing, and after debinding at a temperature of 750 ° C, the semiconductor ceramics are sintered at a temperature of 1400 ° C in a hydrogen atmosphere furnace. , the strontium titanate annular varistor ceramic substrate was obtained by oxidation at 1000°C. Be 85% with Cu content, glass frit content is 9%, the copper paste that solvent content is 6%, is printed on this substrate by 300 mesh screens, (and dry at the temperature of 200 ℃); After being reduced in a nitrogen atmosphere furnace at 900°C, a copper electrode strontium titanate annular varistor is obtained. According to measurements, the solderability of the annular strontium titanate is better.

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Abstract

This invention discloses circular piezoresistor and making method thereof, which consists of a circular resistor substrate and three or more than three electrodes wherein the substrate is made of strontium titanate and the electrode is a copper electrode located on upper end face, lower end face or outside face of substrate. The making process contains ceramic cog preparation, printing and drying of copper slurry and deacidizing of copper electrode.

Description

technical field [0001] The invention relates to a method for preparing a strontium titanate ring varistor and the product obtained, more specifically, the invention relates to a method for preparing a strontium titanate ring varistor with copper as an electrode and the product obtained. technical background [0002] Strontium titanate ring varistor is an electronic component mainly used in micro DC motors to absorb sparks and eliminate noise. [0003] The existing strontium titanate ring varistor mainly uses silver as the electrode. The manufacturing process of this kind of varistor is: first use silk screen to print the first layer of silver paste, and bake it at a temperature of 100 ℃ ~ 200 ℃ Dry; then screen-print the second layer of silver paste and dry it at a temperature of 100°C to 200°C; finally reduce the first layer of silver paste and the second layer of silver paste at a temperature of 550°C to 650°C . The reason why silver paste needs to be printed twice is th...

Claims

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Application Information

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IPC IPC(8): H01C7/10
Inventor 梁戈仁夏颖梅张振勇梁思强
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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