．Nikasil Plating
● Testing of hardness and
metallurgic structure using
micro Vickers hardness tester

● Microscopic metallurgic
structure of nikasil coating

　 It was invented in 1967 and is now widely applied on the cylinder of engine. There are many different processes developed to produce this composite coating material. The results on the eventual applications should be respected. We only partially emphasize:

  • ■　 SiC(Silicon Carbide) The particle diameter and shape
    　　 should be selected with not only considering the durability
    　　 of the nikasil coating layer but also reducing the abrasion
    　　 of piston ring relatively wore out.

  • ■　 SiC(Silicon Carbide) Considering the dispersive distribution,
    　　 the percentage of distribution, and the evenly requirement
    　　 for distribution, every part in the reciprocal strokes can be
  • 　　 durable as the feature of nikasil coating.

  • ■　 SiC(Silicon Carbide) Considering the proportion of solid
    　　 solution in the coating liquid, the arranged proportional
    　　 program of the concentration in the coating liquid, the
    　　 current density that should be applied, the finally
    　　 completed deposit rate (mm/hr) target; how to minimize
    　　 the inner stress of nikasil coating layer, with certain
    　　 deflective ability against the stress of thick nikasil coating
    　　 to prevent cracking or depriving of nikasil coating layer
  • 　　 under high temperature movement.