PVD multi-arc ion coating

  PVD multi-arc ion coating

  1: Introduction and principle of multi-arc ion plating

  If two or more vacuum arc evaporation sources (referred to as arc sources) are used, it is called multi-arc ion plating or multi-arc plating. It is a vacuum ion coating technology that uses vacuum arc discharge as the evaporation source. (The evaporation source is a solid cathode target, and plasma is directly generated from the cathode target source. The arc target can be arranged in any orientation and multiple sources to ensure uniform coating color). Its arc form is to form cathodic arc spots on the cold cathode surface. When the cathode is bombarded by a large number of high-speed positive ions and is heated to a high temperature, the cathode produces significant thermionic emission, which reduces the cathode potential in plasma discharge and increases the discharge current. The cathode drop only needs to maintain the energy of the cathode region (that is, the product of the current and the cathode drop), which is sufficient for the cathode to maintain the temperature required for electron thermal emission, and the arc discharge can be maintained.

  2: Principle of Arc Discharge

  In cathodic arc discharge, only those tiny areas with the highest temperature and the strongest electric field or the lowest work function emit electrons. Therefore, we can see the dazzling glow of the vacuum arc flashing on the surface of the cathode through the observation window of the machine, which is composed of one or several discontinuous small and extremely bright glow spots (called cathode glow The formation of dots or cathode spots)-extinguished, then shifted to generate-and then extinguished, a series of arc process formed by a series of rapid arc trajectories.

  3: Film system and color of multi-arc plating

  Vacuum multi-arc ion plating has been widely used in: knives, tableware, glass, ceramics, crystal products, plastics and various hardware products. Film systems include TiN.ZrN.HfN.TiAIN.TiAINC.TiC.TiNC.CrN and so on. The color film is gun black, jet black, purple, brown, royal blue, rose, bronze, gold, seven colors, etc.

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