Guoqing Wang,Jingfu Song,Gai Zhao,Qingjun Ding,Tianqiang Yin,Hongxing Wang
Tungsten disulfide (WS 2 ) has great potential as solid lubricating coating on the metal surfaces due to its excellent wear resistance. In this study, a combination of experiments and machine learning (ML) was used to explore the friction process and predict the friction coefficient and wear rate of WS 2 coatings. Copper coated with WS 2 was prepared by spraying, and the tribological properties of the coating were studied under different loads, velocities, and environment temperatures using both experiments and simulations. Three ML algorithms were employed to investigate the correlations between multiple input parameters and output results. The results showed that the COF and wear rate increased with increasing load, velocity, and environment temperature, and that plastic deformation and adhesive wear were the dominant wear mechanisms under conditions of heavy load, high speed, and high temperature. The Extra Tree (ET) model effectively predicted the tribological properties of the WS 2 coating, with a COF accuracy of 0.899, while the Gradient Boosting Regression Tree (GBRT) model achieved excellent accuracy in predicting wear rate, with an accuracy of 0.948. Feature importance analysis indicated that load had the greatest effect on both COF and wear rate.
This study demonstrated the dry friction and wear behavior of sol-gel ZrO 2 /WS 2 coatings with biomimetic shark-skin textured surfaces. The effect of added WS 2 on the microstructure and mechanical properties of ZrO 2 coatings was examined and the dry sliding wear and friction behaviors against commercial AISI1045 steel balls were investigated. After adding WS 2 , the micro hardness of ZrO 2 coating decreased by ~39% (from 23.7 GPa to 14.5 GPa), and the average steady state friction coefficient was decreased from ~0.43 to ~ 0.2. When the ZrO 2 /WS 2 coating surface was textured biomimetic shark skin, nearly 66% decrease of the average steady state friction coefficient and 82% decrease of ball wear rate were obtained as compared with the pure ZrO 2 coatings. The possible frictional mechanism of the biomimetic shark-skin structures was discussed.
危险品化学品经营许可证（带存储）