Strontium titanate annular piezoresistor copper-tin electrode manufacturing method

A varistor, copper electrode technology, applied in the direction of adding terminal resistors, etc., can solve the problems of high cost, low copper cost, difficult production process control, etc., to achieve low cost, convenient tin, mature and reliable production technology. Effect

Inactive Publication Date: 2021-07-23
肇庆市正科集志电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Resistors have at least three electrodes, and each electrode is soldered once. There are advantages and disadvantages for silver and copper electrodes: silver is easy to be tinned, but it is easy to be ablated by tin to form a mutual fusion alloy; copper is resistant to ablation, but the production process technology content High, the copper surface is easy to oxidize, and once oxidized, it is not easy to be tinned, so it is difficult to control the production process to ensure that the copper surface is not oxidized, and the copper electrode needs to be sintered in a pure nitrogen atmosphere
Silver is a precious metal with high cost, but the mainstream of domestic production
The cost of copper is low, and it is difficult to mass-produce due to the high technical difficulty in China
Although some manufacturers have applied for patents on copper electrodes, there is no mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The varistor ceramic substrate is printed with copper paste according to the required drawing, dried, sintered at 750-830 degrees Celsius under the protection of nitrogen, and sintered into a copper electrode varistor. This sintered copper process does not require very strict process requirements. Allow the copper to partially oxidize. Put the product into the copper polishing agent (purchased) solution for 10-60 seconds. This step is to remove the oxide film on the surface of the copper electrode, and then wash it with water for 1-3 times to wash off the residual copper polishing agent. Immerse in the tin plating solution (purchased) for 10-180 seconds, the tin ions will get copper electrons, and the tin will be precipitated on the surface of the copper electrode to complete the tin plating. The color will change from copper yellow to tin white, and then wash 1-3 times with water to wash off the residual tin plating solution and dry the surface moisture.

Embodiment 2

[0025] The varistor ceramic substrate is printed with copper paste according to the required drawing, dried, sintered at 750-830 degrees Celsius under the protection of nitrogen, and sintered into a copper electrode varistor. This sintered copper process does not require very strict process requirements. Allow the copper to partially oxidize. The product is directly immersed in the tin-plating solution without copper polishing agent, because the tin-plating solution (purchased) is acidic, and the acid radicals will directly react to the copper oxide on the surface and leak copper elemental substance, immerse in the tin-plating solution for 10-180 seconds, tin ions The copper electrons are obtained, and the tin is deposited on the surface of the copper electrode, and the tin plating is completed. The color will change from copper yellow to tin white, and then wash 1-3 times with water to wash off the residual tin plating solution and dry the surface moisture. This process is o...

Embodiment 3

[0027] The varistor ceramic substrate is printed with copper paste according to the required drawing, dried, sintered at 750-830 degrees Celsius under the protection of nitrogen, and sintered into a copper electrode varistor. This sintered copper process does not require very strict process requirements. Allow the copper to partially oxidize. Subsequent barrel plating is processed by a professional manufacturer, and the process is generally as follows: first acid or copper polish to remove the oxide film, washing, tinning on the barrel (mature process), washing, and drying.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features, and in the description of the present invention, the me...

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Abstract

The invention discloses a strontium titanate annular piezoresistor copper-tin electrode manufacturing method which comprises the steps of 1) printing an annular piezoelectric electrode on an annular piezoelectric magnet through copper paste, and sintering the annular piezoelectric electrode into a copper electrode; and 2) carrying out tin plating processing on the copper electrode in the step 1), wherein tin plating is carried out in two modes, one mode is tin immersion, the copper electrode is immersed in a solution containing tin ions, and tin is replaced with copper, and the other mode is tin electroplating, a barrel plating method is adopted, the piezoresistor with a copper electrode is placed in a cathode barrel plating tank, tin metal is connected to an anode, and tin can be electroplated on the copper electrode after the electroplating solution passes through current. Compared with the prior art, the method has the advantages that the electrode is sintered through copper paste, the harshness of the process for sintering the copper electrode is greatly reduced, the copper-tin electrode is formed through tin plating, tin soldering is facilitated, ablation is not prone to occurring during tin soldering, the tin layer protects inner layer copper from being easily oxidized, the production technology is mature and reliable, and the cost is low.

Description

technical field [0001] The invention relates to the production of industrial parts, in particular to a production method of a copper-tin electrode of a strontium titanate annular varistor. Background technique [0002] Strontium titanate ring varistors are used in micro DC motors to weaken the electric sparks of conductive brushes and resist electromagnetic interference. Thereby prolonging its stability and service life. [0003] The substrate of this resistor is strontium titanate, which belongs to ceramics. Ceramics cannot be directly soldered. It needs a layer of specific metal electrodes attached to the surface to be tinned. The copper wires connected to the motor rotor are connected by soldering. The electrodes are made by this product. important process. There are currently two types of electrodes, silver electrodes and copper electrodes. At present, silver electrodes are mainly produced in China, and TDK Corporation of Japan produces copper electrodes, and there is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C17/28
CPCH01C17/28
Inventor 陈国新
Owner 肇庆市正科集志电子科技有限公司
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