Unlock instant, AI-driven research and patent intelligence for your innovation.

Surface-layer silver paste for SrTiO3 piezoresistor and preparation method of surface-layer silver paste

A varistor and surface layer technology, which is applied in the field of surface layer silver paste for SrTiO3 varistors and its preparation, can solve the problems of large pulse change rate, unstable performance, large voltage difference, etc., and achieve stable and reliable performance and improved Electrical properties, the effect of reducing contact resistance

Inactive Publication Date: 2015-07-08
SHANGHAI JIAOTONG UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic research began in the late 1980s, and some products were launched in the 1990s, but compared with foreign products, most of them have disadvantages such as unstable performance, large voltage difference, large positive and negative polarity, poor welding performance and large pulse change rate.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of glass powder: take by weighing 10wt% Na 2 O, 10wt% Bi 2 o 3 , 15wt%TiO 2 , 20wt% B 2 o 3 , 15wt% BaO, 3wt% Al 2 o 3 , 7wt% Li 2 O and 20wt% SiO 2 After mixing evenly, keep it warm at 1075°C for 0.5 hours, quench the molten glass with water and dry it. First, use a 20mm large ball for 4 hours of dry grinding, and then remove a 1mm small ball for 25 hours of wet grinding. After drying, D50 can be obtained It is about 2.7um glass powder.

[0023] (2) Preparation of organic binder: take by weighing 15wt% of ethyl cellulose, 40wt% of butyl carbitol, and 45wt% of oleic acid, fully dissolve in a constant temperature water bath at 85°C, and keep warm for 4 hours. Then filter through a 300-mesh stainless steel wire mesh, and use it after aging for 3 days

[0024] (3) preparation of slurry: take by weighing the silver powder of 80wt%, the nickel powder of 4wt%, the glass powder of 6wt%, the organic binder of 2wt%, the diluent of 6wt%, fully disperse o...

Embodiment 2

[0028] (1) Preparation of glass powder: take by weighing 10wt% Na 2 O, 10wt% K 2 O, 10wt%TiO 2 , 20wt% B 2 o 3 , 20wt%Pb 2 o 3 , 3wt%Al 2 o 3 , 7wt% MgO and 20wt% SiO 2 After mixing evenly, heat it at 1115°C for 1 hour, quench the molten glass with water and dry it. First, use a 20mm large ball for 5 hours of dry grinding, and then remove a 1mm small ball for 30 hours of wet grinding. After drying, D50 can be obtained It is about 2.3um glass powder.

[0029] (2) Preparation of organic binder: take by weighing 20wt% of ethyl cellulose, 70wt% of butyl carbitol, 10wt% of terpineol, fully dissolve in a constant temperature water bath at 80°C, and keep warm for 4 hours , and then filtered through a 300-mesh stainless steel wire mesh, aged for 3 days before use

[0030] (3) preparation of slurry: take by weighing the silver powder of 75wt%, the nickel powder of 10wt%, the glass powder of 5wt%, the organic binder of 2wt%, the diluent of 6wt%, carry out sufficient dispersion o...

Embodiment 3

[0033] (1) Preparation of glass powder: take by weighing 10wt% Na 2 O, 20wt% Bi 2 o 3 , 15wt%TiO 2 , 20wt% B 2 o 3 , 15wt% BaO, 10wt% Li 2 O and 10wt% SiO 2 After mixing evenly, keep it warm at 1000°C for 0.5 hours, quench the molten glass with water and dry it. First, use a 20mm large ball to dry grind for 2 hours, and then remove a 1mm small ball to wet grind for 24 hours. After drying, you can get D50 It is about 2.6um glass powder.

[0034] (2) Preparation of organic binder: take by weighing 15wt% ethyl cellulose, 40wt% butyl carbitol, 45wt% terpineol, fully dissolve in a constant temperature water bath at 85°C, and keep warm for 4 hours , and then filtered through a 300-mesh stainless steel wire mesh, aged for 3 days before use

[0035] (3) preparation of slurry: take by weighing the silver powder of 82wt%, the nickel powder of 2wt%, the glass powder of 6wt%, the organic binder of 2wt%, the diluent of 6wt%, fully disperse on the three-roll machine, Adjust the slu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to surface-layer silver paste for a SrTiO3 piezoresistor and a preparation method of the surface-layer silver paste. Raw materials of the surface-layer paste include components, by weight, from 60 to 90 parts of silver powder, from 5 to 10 parts of nickel powder, from 1 to 20 parts of glass powder, from 1 to 20 parts of organic adhesion agents and from 10 to 30 parts of diluents. The preparation method includes stirring the components uniformly after the glass powder is prepared to obtain the surface-layer silver paste for the SrTiO3 piezoresistor. Compared with the prior art, the prepared surface-layer silver paste for the SrTiO3 piezoresistor is applied to annular piezoresistors, problems of poor weldability and poor sintering performance of current paste in China are solved, and the comprehensive performance of the surface-layer silver paste is comparable to that of a foreign like product.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, in particular to a SrTiO 3 Surface layer silver paste for varistor and preparation method thereof. Background technique [0002] SrTiO 3 The varistor is a new type of multifunctional composite electronic component developed in the late 1980s and early 1990s in the world. It is based on SrTiO 3 As the main component, add a small amount of rare earth elements and metal oxides, through ball milling, spray granulation, dry pressing molding, sintering at high temperature in a reducing atmosphere to make the crystal grain semiconducting, and heat treatment at low temperature in the air to insulate the grain boundary. Slurry is made by burning electrodes, measuring and other processes. [0003] SrTiO 3 The varistor has both capacitance and pressure-sensitivity composite functions. Low sensitive voltage; excellent nonlinear coefficient; large capacitance; at the same time, it has many e...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00H01C7/102
Inventor 胡晓斌焦伟雄
Owner SHANGHAI JIAOTONG UNIV