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Preparation method of ceramic filter surface electrode

A ceramic filter and surface electrode technology, applied in the field of filters, can solve the problems of high production cost, high cost, low yield, etc., and achieve the effects of reducing production cost, improving service life, and solving easy oxidation

Inactive Publication Date: 2020-09-08
SHENZHEN INST OF WIDE BANDGAP SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, both methods have certain defects. For example, if the paste silver paste is printed on the surface of the ceramic sheet and then sintered at a high temperature, there is often the problem of insufficient adhesion between the silver electrode and the ceramic sheet interface, and the yield is low.
Evaporation and sputtering require coating equipment that can provide high vacuum and high power, and the preparation cost is relatively high
In addition, the price of silver itself is relatively expensive, and the cost is relatively high.

Method used

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  • Preparation method of ceramic filter surface electrode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a method for preparing ceramic filter electrodes, the experimental process is as follows figure 1 shown.

[0026] 1. Ceramic substrate pre-cleaning.

[0027] The lead zirconate titanate ceramics are cleaned with 30% hydrochloric acid, then cleaned with acetone and isopropanol in sequence, and dried to obtain a pretreated ceramic substrate.

[0028] 2. Preparation of the first coating.

[0029] Soak the pretreated ceramic substrate in the first solution containing copper chloride, ethylenediaminetetraacetic acid (EDTA), NaoH, and polyethylene glycol for 20 minutes. The concentration of copper chloride is 10g / L, the concentration of EDTA is 15g / L, the concentration of NaOH is 20g / L, the concentration of polyethylene glycol is 1-8g / L, the concentration of formaldehyde is 0.36%, and the reaction temperature is room temperature. A ceramic substrate with a copper film, the thickness of the copper film is 400nm.

[0030] 3. Preparation of the secon...

Embodiment 2

[0033] This embodiment provides a method for preparing ceramic filter electrodes, the experimental process is as follows figure 1 shown.

[0034] 1. Ceramic substrate pre-cleaning.

[0035] The lead zirconate titanate ceramics are cleaned with a mixed solution of hydrochloric acid and nitric acid, cleaned again with alcohol, and dried to obtain a pretreated ceramic substrate.

[0036] 2. Preparation of the first coating.

[0037] Soak the pretreated ceramic substrate in the first solution containing copper sulfate, EDTA, NaoH, and polyethylene glycol for 20 minutes. The concentration of copper sulfate is 20g / L, preferably, the concentration of EDTA is 15g / L, and the concentration of NaOH is 10g / L. Preferably, the concentration of polyethylene glycol is 1-8g / L, the concentration of formaldehyde is 0.4%, and the reducing agent poly The concentration of phosphoric acid is 10g / L, and the reaction temperature is room temperature to obtain a ceramic substrate plated with a copper...

Embodiment 3

[0041] This embodiment provides a method for preparing ceramic filter electrodes, the experimental process is as follows figure 1 shown.

[0042] 1. Ceramic substrate pre-cleaning.

[0043] The lead zirconate titanate ceramics are cleaned with 30% hydrochloric acid, then cleaned with acetone and isopropanol in sequence, and dried to obtain a pretreated ceramic substrate.

[0044] 2. Preparation of the first coating.

[0045] Soak the pretreated ceramic substrate in the first solution containing copper nitrate, EDTA, NaOH and polyethylene glycol for 30 minutes. The concentration of copper nitrate is 10-20g / L, preferably, the concentration of diethylenetriaminepentaacetic acid is 15g / L, the concentration of disodium hydrogen phosphate is 20g / L, the concentration of formaldehyde is 0.36%, preferably, polyethylene glycol The concentration is 8g / L, the reaction temperature is room temperature, and a ceramic substrate coated with a copper film is obtained, and the thickness of the ...

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Abstract

The invention provides a preparation method of a ceramic filter surface electrode, which comprises the following steps: S1, cleaning the surface of a ceramic substrate to obtain a first ceramic substrate; S2, preparing a first copper plating layer from the first ceramic base material through a film plating process, wherein the thickness of the first copper plating layer ranges from 100 nm to 800 nm, and a second ceramic base material is obtained; and S3, preparing a second tin plating layer coating the surface of copper from the second ceramic base material through a film plating process, wherein the thickness of the second tin plating layer ranges from 50 nm to 900 nm. According to the preparation method of the ceramic filter electrode, large-scale high-power high-vacuum equipment is notneeded, the cost is low, copper is used for replacing silver, and the production cost is greatly reduced.

Description

technical field [0001] The invention relates to the field of filters, in particular to a method for preparing surface electrodes of ceramic filters. Background technique [0002] Ceramic filters are generally made of lead zirconate titanate ceramic materials. Electrodes are coated with metal at both ends of the sheet-shaped ceramic material. After DC high-voltage polarization, it has piezoelectric effect. As a key component of frequency selection, the filter has the characteristics of stability and good anti-interference performance, and is widely used as a frequency selection component in various electronic products such as televisions, video recorders, and radios. It has the advantages of stable performance, no adjustment, and low price, and replaces the traditional LC filter network. The preparation process of the electrode coating on the surface of the filter has a key influence on the performance of the filter. At present, there are two main methods for the electrode p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P11/00C23C18/40C23C18/52
CPCH01P11/007C23C18/405C23C18/52
Inventor 唐宏浩叶怀宇张国旗
Owner SHENZHEN INST OF WIDE BANDGAP SEMICON