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Piezoelectric ceramic element of metal aluminium electrode and preparation method thereof

A piezoelectric ceramic element and metal electrode technology, which is applied in the field of piezoelectric ceramic elements, can solve the problems of the difference in the combination of electrode materials and base materials, the easy falling off of electrode materials, and the falling off of electrodes, so as to achieve good electrical conductivity, reduced production costs, The effect of high adhesion strength

Inactive Publication Date: 2010-05-26
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the piezoelectric ceramics will produce mechanical vibration and deformation due to the positive and negative piezoelectric effects during normal operation, it is easy to cause the electrode to fall off; and the surface of the sintered piezoelectric ceramic material is relatively smooth, and the electrode material is easy to fall off; at the same time, PZT piezoelectric ceramics The composition of the material is different from the barium titanate-based PTC ceramic material or the solar cell substrate material, and the combination of the electrode material and the substrate material will also be different
Therefore, as an electrode of a piezoelectric ceramic, there is no need to solve the ohmic contact problem between the electrode and the base material like a PTC thermistor or a solar cell, and the above-mentioned aluminum electrode paste for a PTC thermistor or a solar cell cannot be directly used for making Piezoelectric ceramic aluminum electrodes

Method used

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  • Piezoelectric ceramic element of metal aluminium electrode and preparation method thereof
  • Piezoelectric ceramic element of metal aluminium electrode and preparation method thereof
  • Piezoelectric ceramic element of metal aluminium electrode and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0037] In this embodiment, the piezoelectric ceramic sounding element (piezoelectric buzzer chip) is taken as an example. The inverse piezoelectric effect, which converts electrical energy of piezoelectric ceramic materials into mechanical energy, is used to produce sound-generating components. Such sound-generating components have been widely used in various electronic instruments and equipment, household appliances, electronic toys, etc. Its preparation method is to print silver electrode paste on the two ends of the sintered lead zirconate titanate (PZT) ceramics, make electrodes through high-temperature reduction, and then polarize and paste metal vibrating pieces to make piezoelectric ceramics. Buzzer, piezoelectric ceramic buzzer can be directly used as a sounding element, or piezoelectric ceramic buzzer can be put into a plastic resonance cavity to make a piezoelectric buzzer.

[0038]As shown in FIG. 1 , the piezoelectric buzzer ceramic chip includes sintered PZT ceram...

Embodiment 2

[0053] Some specifications of the piezoelectric ceramic buzzer do not use welding to connect the internal piezoelectric buzzer and the lead-out wire, but use the elastic contact method of metal parts, that is, the external excitation electrical signal is connected to the bee card electrode through the elastic metal member. , to make the buzzer sound.

[0054] In order to reduce costs, the piezoelectric ceramic sheet electrodes of this type of buzzer can be made of aluminum electrode paste on one or both sides. When aluminum electrodes are used on one side, the appearance of the piezoelectric buzzer is better, that is, the electrode on one side that is pasted with the metal vibrating piece is made into an aluminum electrode, and the side that is in contact with the metal elastic member is made from a silver electrode. The method of making an aluminum electrode on one side is described in the embodiment 1 has been described. When aluminum electrodes are used on both sides, alth...

Embodiment 3

[0063] Using aluminum electrode paste to make electrodes on both sides of the piezoelectric ceramic element can further reduce product cost. Although the aluminum electrode can conduct electricity similarly to the silver electrode, the excitation signal lead wire of the buzzer cannot be welded on the aluminum electrode by soldering. Silver electrodes, and aluminum electrodes for the rest, see Figure 3.

[0064] In this implementation, the purchased silver electrode paste (DS-PF-7170VR paste produced by Shanghai Dazhou Electronic Materials Co., Ltd.) was used to make silver electrodes. The production method of the aluminum electrode slurry adopted is the same as that of Example 1 and Example 2. According to the total mass percentage of the formula raw materials, the aluminum electrode slurry consists of: 58% metal aluminum powder, 13% low-melting point lead-free glass Powder, 1% antioxidant additive (wherein amorphous boron powder and red phosphorus are half and half), 18% eth...

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Abstract

The invention discloses a piezoelectric ceramic element of a metal aluminum electrode and a preparation method thereof. The piezoelectric ceramic element of the metal aluminum electrode comprises PZT ceramic and a metal electrode sintered on the upper and lower surfaces of the PZT ceramic; the metal electrode at least has an aluminum electrode surface which is sintered on the PZT ceramic by using aluminum electrode slurry. Based on mass percentage, the prescription of raw materials of the aluminum electrode comprises 55-60% of metal aluminum powder, 12-15% of unleaded glass powder with low melting point, 14-18% of ethylcellulose bond, 1.0% of antioxidant assistant and the balance of organic solvent. The preparation method comprises the steps of preparing the aluminum electrode slurry, printing, sintering the aluminum electrode slurry on the surfaces of the PZT ceramic and polarizing the electric field. In the invention, the bonding strength between the aluminum electrode surface and the PZT piezo ceramic is improved through adjusting chemical components and the proportion of the organic bond in the aluminum electrode slurry, and by replacing the silver electrode with the aluminum electrode, the manufacturing cost of the piezoelectric ceramic element can be reduced greatly.

Description

technical field [0001] The present invention relates to a piezoelectric ceramic element, in particular to a metal aluminum electrode piezoelectric ceramic element and a preparation method thereof, in particular to making a metal aluminum electrode on a lead zirconate titanate (PZT)-based piezoelectric ceramic chip to form a metal aluminum electrode piezoelectric Method for the preparation of ceramic components. Background technique [0002] Piezoelectric ceramic materials are widely used in the manufacture of piezoelectric electroacoustic components (including piezoelectric buzzers, piezoelectric buzzers, piezoelectric speakers), piezoelectric ultrasonic components (including ultrasonic cleaning components, ultrasonic atomization components , ultrasonic detection components, etc.). The method of high temperature sintering treatment is used to make conductive metal electrodes on both ends of the sintered PZT ceramic sheet, and then polarized by a strong electric field to pro...

Claims

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Application Information

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IPC IPC(8): H01L41/08H01L41/047H01L41/18H01L41/24H01L41/39
Inventor 卢振亚陈文姬朱惠祥
Owner SOUTH CHINA UNIV OF TECH
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