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Dry sliding tribological characteristics of HVOF-WC/DLC duplex coating in the temperature range of RT-400 °C
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DOI：10.1016/j.mtcomm.2025.112102.png)
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Abstract
En 中文
The high-velocity oxygen-fuel sprayed WC-20Cr3C2-7Ni (HVOF) coating was treated using a linear ion source (LIS) process to obtain HVOF-DLC (Hybrid) coating. The mechanical and tribological properties of HVOF coating before and after DLC film modification were investigated from RT-400 degrees C. The results showed that the hardness and toughness of Hybrid coating were significantly improved at various temperatures compared to HVOF coating. In addition, due to the overlaying of DLC film on the HVOF coating, the wear rate of the Hybrid coating was reduced by half and the coefficient of friction (COF) was also substantially low at RT-400 degrees C due to its high hardness and self-lubricating properties. The mechanical and tribological properties of the HVOF coating and the Hybrid coating degraded with increasing temperature. The degradation mechanisms of the two coatings were the decomposition and oxidation of carbides and the graphitization of DLC film, respectively. In short, the overlaying of the DLC thin film on the HVOF coating greatly enhanced its mechanical and tribological properties from RT400 degrees C.
Keywords:
DLC thin film
Tribology
Self-lubrication
Graphitization
Journal
IF:
20.6
Papers:
3.5W
Citations:
5.4W
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