Do you know how to prepare tungsten needle efficiently? The experts have proposed a method for preparing tungsten needles with the advantages of high degree of automation, good repeatability and high efficiency.
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http://tungsten.com.cn/tungsten-needles.html
Utilizing the principle of electrochemical reaction, a linear motor is used to drive the tungsten wire up and down in the NaOH corrosion solution, so that the reaction proceeds between the anode tungsten wire and the cathode ring copper electrode. Wherein, the taper of the tungsten needle and the radius of the tip can be adjusted by the change of moving speed of linear motor. In this process, it is necessary to use a sampling resistor, a low-pass filter circuit, a voltage follower, and a high-speed comparator to monitor the current change in the circuit. When the tungsten wire is etched in the electrolyte solution, the sudden change of the current in the circuit changes the output signal of the comparator, cuts off the pressure circuit, and ends the entire electrolytic corrosion process.
