Research on the Optimization of DLC Coating Process for the High Hardness and Low Friction of the Control Valve Stem in Nuclear Power Plants
The influence of different processes on the performance of valve stem DLC coatings was investigated by adjusting process parameters such as workpiece bias and W-doped target power.The chemical composition and structure of different DLC coatings were studied using Raman spectroscopy,and the mechanical properties of the coatings were tested using nanoindentation and microscratch techniques.Meanwhile,the tribological properties of the composite coatings were evaluated through friction-wear tests.The results showed that the DLC coating obtained under a workpiece bias of 1200V had higher hardness and lower wear rate.The W-doped DLC coating had stronger adhesion but lower hardness and higher wear rate.This study provides reference for the subsequent design of high hardness and low friction DLC coating processes.
DLC coatinghardnessfriction and wearsurface modificationpreparation process
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