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Preparation method of piezoelectric ceramic surface electrode

A piezoelectric ceramic and surface electrode technology, which is applied in the field of piezoelectric ceramic surface electrode preparation, can solve the problems of high cost of gold electrodes, highly toxic cyanide, and easy corrosion of plated parts, and achieves good welding performance and low porosity. , the effect of strong weldability

Active Publication Date: 2013-08-14
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation methods of gold electrodes mainly include electroplating, ion sputtering and chemical plating. coating, but cyanide is highly toxic and must be carried out under high temperature and strong alkali conditions, which is easy to corrode the plating
Therefore, these methods are not suitable for the preparation of gold electrodes for piezoelectric ceramics. It is necessary to study and explore a new cyanide-free electroless gold plating method suitable for piezoelectric ceramics to provide a broader prospect for the application and development of piezoelectric ceramic materials.

Method used

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  • Preparation method of piezoelectric ceramic surface electrode
  • Preparation method of piezoelectric ceramic surface electrode
  • Preparation method of piezoelectric ceramic surface electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. The solution used for nickel plating is as follows:

[0039]

[0040] 2. Prepare each solution according to the following method:

[0041] Coarse solution: Prepare mineral acid and distilled water in proportion.

[0042] Sensitizer: SnCl 2 2H 2 O, concentrated hydrochloric acid and distilled water are prepared in proportion, and the dissolution process is heated.

[0043] Activation solution: PdCl 2 It is formulated by dissolving in diluted hydrochloric acid, and heat-treated during the dissolution process.

[0044] Nickel plating solution: a. Dissolve the calculated and weighed various chemicals with appropriate amount of distilled water;

[0045] b. NaH 2 PO 2 ·H 2 O and NH 4 Cl solution was mixed to make B solution;

[0046] c. NiSO 4 ·7H 2 O, BSO additive (BSO additive is a commonly used additive for electroless plating, its main chemical component is saccharin, scientific name o-benzoylsulfonimide, primary brightener) and NaC 6 h 5 o 7 2H 2 Ea...

Embodiment 2

[0073] Prepare the nickel-gold composite electrode according to the method of Example 1, the difference is: the piezoelectric ceramic used is a PLN piezoelectric ceramic block, and the solution and process used for nickel plating are as follows:

[0074]

[0075]

[0076] Prepare the required nickel plating solution and gold plating solution according to the method of Example 1, and carry out chemical gold plating on the surface of the PLN piezoelectric ceramic block with the nickel base layer plated. The obtained electrode has good gloss, low porosity, uniform and dense crystal grains, and is closely attached to the surface of the nickel layer, and the gold plating layer is relatively thin, with a thickness of 0.13 μm. The whole electrode is closely combined with the piezoelectric ceramic substrate, and the weldability and bonding force are good. The resistivity is low, the value is 1.054×10 -7 Ω·m, the corrosion potential is relatively positive, the value is -0.372V,...

Embodiment 3

[0078] Prepare the nickel-gold composite electrode according to the method of Example 1, the difference is: the piezoelectric ceramic used is a PZT-5 piezoelectric ceramic ring, and the solution and process used for nickel plating are as follows:

[0079]

[0080]

[0081] The required nickel plating solution and gold plating solution were prepared according to the method in Example 1, and electroless gold plating was performed on the surface of the PZT-5 piezoelectric ceramic ring plated with the nickel base layer. The obtained electrode has good gloss, low porosity, uniform and dense crystal grains, and is closely attached to the surface of the nickel layer, and the gold plating layer is relatively thin, with a thickness of 0.13 μm. The whole electrode is closely combined with the piezoelectric ceramic substrate, and the weldability and bonding force are good. The resistivity is low, the value is 0.900×10 -8 Ω·m, the corrosion potential is relatively positive, the valu...

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Abstract

The invention discloses a preparation method of a piezoelectric ceramic surface electrode. The preparation method is characterized in that a layer of metallic nickel is plated on the surface of a piece of piezoelectric ceramic; gold is plated on the surface of a nickel plating layer by using a chemical plating method, so as to obtain a nickel-gold composite electrode, wherein a gold-plating liquid is a water solution which comprises the following components of 1.2-2.8g / L of Na3Au(SO3)2, 8-25g / L of Na2SO3, and 10-25g / L of KH2PO4; and the molar ratio of the concentration of C2H8N2 to the gold is kept to be (6-20):1. The preparation method is simple and easy to operate, and free from limit of shapes of workpieces; a cyanogen-free chemical plating technology is adopted for preparing the gold electrode, the use of highly-toxic cyanides is avoided, and the environment-friendly and safe performances can be realized; and the prepared gold electrode is uniform, stable in chemical property, low in resistivity, high in corrosion resistance, low in porosity, good in bonding force, and good in welding performance, can well meet the application requirements of the piezoelectric ceramic and improves the use performance of the piezoelectric ceramic.

Description

technical field [0001] The invention relates to a method for plating metal electrodes on piezoelectric ceramics, in particular to a method for plating nickel-gold composite electrodes on piezoelectric ceramics by adopting cyanide-free chemical gold plating technology. Background technique [0002] Piezoelectric ceramics are a class of information functional materials that have piezoelectric effects and can convert mechanical energy and electrical energy into each other. They are widely used in medicine, electronics, aerospace and other fields. However, the inherent electrical insulation of piezoelectric ceramics severely limits its application and development, so electrodes must be plated on its surface. At present, the electrode materials used in piezoelectric ceramics are mostly silver and nickel, but the silver electrode needs to be fired at a high temperature of 800°C to obtain it, which is complicated in process and difficult to operate. The preparation process of nick...

Claims

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Application Information

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IPC IPC(8): C04B41/90
Inventor 张颖黄世峰周美娟徐东宇张娜程新
Owner UNIV OF JINAN
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