Strontium titanate annular piezoresistor copper-tin electrode manufacturing method

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...