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Ring Side Armouring
Nitriding

Another option for armouring piston ring sides is nitriding.
A controlled side nitriding process significantly increases the surface hardness and hence improves wear resistance. Precipitation of nitride in the diffusion layer additionally reduces susceptibility to microwelding.
See Fig. 30.


Fig. 30: Rectangular Ring with Nitrided Sides; View of the Nitrided Case

 

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