The cathode material of vacuum electroplating electric heating tube is related to shape, gas type pressure, etc.

The cathode material of vacuum electroplating electric heating tube is related to shape, gas type pressure, etc.

Charged particles with tens of electron volts or higher kinetic energy bombard the surface of the material and sputter it out into the gas phase, which can be used for etching and coating. The number of atoms sputtered by an incident ion is called the sputtering yield. The higher the yield, the faster the sputtering speed. Cu, Au, Ag are the highest, and Ti, Mo, Ta, W are the lowest. Generally 0.1-10 atoms/ion. Ions can be generated by DC glow discharge. At a vacuum of 10-1-10Pa, a high voltage is applied between the two poles to generate a discharge. The positive ions will bombard the negatively charged target and sputter the target, which will be plated on the object to be plated. . The current density of normal glow discharge (glowdischarge) is related to the cathode material and shape, gas type pressure and so on. It should be kept as stable as possible during sputtering. Any material can be sputtered, even high melting point materials are easy to sputter, but radio frequency (RF) or pulse (pulse) sputtering is required for non-conductor targets; and due to poor conductivity, sputtering power and speed are relatively high. Low. Metal sputtering power can reach 10W/cm2, non-metal <5W/cm2.

Diode sputtering: The target is the cathode, the workpiece to be plated and the workpiece frame are the anode, and the gas (Ar) pressure is about a few Pa or higher to obtain a higher plating rate.

Main steps and functions of vacuum electroplating electric heating tube

(1) Cleaning: Remove the dirt and fingerprints left in the process of plastic electroplating and molding, wash it with alkaline agent, neutralize it with acid immersion and wash it with water.

(2) Solvent treatment: Make the plastic surface wet so that it can act with the regulator in the next step.

(3) Adjustment treatment: Roughen the plastic surface into inner-locked concave holes so that the coating is not easily peeled off, also known as chemical roughening.

(4) Sensitization: The reducing agent is adsorbed on the surface, commonly used or other tin compounds, that is, the Sn^++ ion adsorbed on the plastic surface has a reducing surface.

(5) Nucleation: The catalytic material such as gold is adsorbed on the sensitized (reductive) surface, and then nucleated into catalytic metal seeds by reduction, and then the metal can be electroless plated.

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