Lead-free and cadmium-free electrode silver slurry for piezoelectric ceramics and preparation method thereof

A technology of piezoelectric ceramics and cadmium electrodes, which is applied in the field of lead-free and cadmium-free electrode silver paste for piezoelectric ceramics and its preparation, and can solve the problem of unspecified paste, affecting the reliability and stability of silver paste performance, use, etc. problems, to achieve the effect of improving filling degree, excellent weldability and improving sintering activity

Active Publication Date: 2012-10-24
HEFEI SHENGDA ELECTRONIC TECH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the number of patents for lead-free electrode silver paste for functional ceramics has been increasing, but none of these patents indicate that the paste can be used on piezoelectric ceramic substrates
Generally, lead-free and cadmium-free glass contains a large amount of alkali metal elements such as potassium K and sodium Na, which will seriously affect the reliability and stability of silver paste performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A lead-free and cadmium-free electrode silver paste for piezoelectric ceramics, which is made from the following raw materials in weight percent:

[0047] Conductive silver powder 75g

[0048] Inorganic additives 2g

[0049] Lead-free glass powder 5g

[0050] Organic vehicle 18g;

[0051] Described lead-free glass powder it it is made by the raw material of following weight percent:

[0052] Bi 2 o 3 5%

[0053] B 2 o 3 45%

[0054] SiO 2 5%

[0055] ZnO 40%

[0056] CaO 1%

[0057] TiO 2 1%

[0058] ZrO 2 1%

[0059] NiO 1%

[0060] Al 2 o3 1%;

[0061] Described organic vehicle it is made of the raw material of following percentage by weight:

[0062] Organic binder 15%

[0063] Slurry thixotropic agent 6%

[0064] Surfactant 6%

[0065] Slurry defoamer 3%

[0066] Organic solvents 70%.

[0067] The conductive silver micropowder is a mixture of spherical or ...

Embodiment 2

[0078] Weigh raw material Bi 2 o 3 200g, B 2 o 3 400g, SiO 2 50g, ZnO 200g, CaO 35g, TiO 2 20g, ZrO 2 15g, NiO 60g, Al 2 o 3 20g, mixed and put into a quartz crucible and melted in an electric furnace at a temperature of 1200°C and a holding time of 20min. Then pour the molten glass into water for quenching, put it into a ball mill, add water and ball mill until the particle size of the glass powder is less than 10μm, and dry Afterwards, the glass frit of lead-free, cadmium-free and environment-friendly silver electrode paste for piezoelectric ceramics is obtained.

[0079] Take by weighing raw material ethyl cellulose 55g, rosin 10g, dimethyl phthalate 15 g, lecithin 20, modified polysiloxane 5g, terpineol 895g. Each raw material is put into container and heated and stirred, in Dissolve ethyl cellulose, rosin and the like at 110°C to obtain the organic carrier of the lead-free, cadmium-free and environment-friendly silver electrode paste for piezoelectric...

Embodiment 3

[0083] Weigh raw material Bi 2 o 3 450g, B 2 o 3 260g, SiO 2 75g, ZnO 150g, CaO 15g, TiO 2 20g, ZrO 2 15g, Al 2 o 3 15g, mixed and put into a quartz crucible and melted in an electric furnace at a temperature of 1250°C and a holding time of 20min. Then pour the molten glass into water and quench it, put it into a ball mill and add water to ball mill until the particle size of the glass powder is less than 10μm, and dry Afterwards, the glass frit of lead-free, cadmium-free and environment-friendly silver electrode paste for piezoelectric ceramics is obtained.

[0084] Take by weighing raw material ethyl cellulose 45g, rosin 10g, hydrogenated castor oil 15g, lecithin 20, stearic acid 10, modified polysiloxane 5g, terpineol 895g. Each raw material is put into container and heated and stirred, Dissolve ethyl cellulose, rosin and the like at 110°C to obtain the organic carrier of lead-free, cadmium-free and environment-friendly silver electrode paste for piezoelect...

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PUM

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Abstract

The invention discloses a lead-free and cadmium-free electrode silver slurry for piezoelectric ceramics. The lead-free and cadmium-free electrode silver slurry for piezoelectric ceramics is prepared from the following raw materials in percentage by weight: 50 to 75 percent of conducting silver micro powder, 0.5 to 5 percent of inorganic additive, 1 to 15 percent of lead-free glass powder and 15 to 45 percent of organic carrier. The lead-free and cadmium-free electrode silver slurry is technologically advantaged in that a boron-bismuth-silicon-zinc-titanium glass system is designed, the traditional lead-containing glass can be completely substituted, a lead-free product is realized, the system glass can react with a piezoelectric ceramic substrate to form a firm interface between an electrode and the substrate, and the adhesion force of the interface is more than 15N / mm<2>.

Description

technical field [0001] The invention relates to the field of electrode paste, in particular to a lead-free and cadmium-free electrode silver paste for piezoelectric ceramics and a preparation method thereof. Background technique [0002] Piezoelectric material is a functional material that realizes the mutual conversion of mechanical energy and electrical energy. It plays an important role in functional conversion devices such as electricity, magnetism, sound, light, heat, gas, and force. It is widely used in various types of water Acoustic, ultrasonic, electroacoustic transducers and oscillators, filters and sensors based on piezoelectric equivalent circuits. [0003] Since the vibration frequency of most piezoelectric elements is relatively large during use, that is, in the range of several kilohertz to hundreds of megahertz, this requires that the bonding strength between the silver electrode layer and the substrate should be large enough to avoid the silver electrode De...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00C03C12/00
Inventor 谢实辉
Owner HEFEI SHENGDA ELECTRONIC TECH IND CO LTD
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