Understanding the wear failure mechanism of TiAlSiCN nanocomposite coating at evaluated temperatures

摘要

The work investigated the tribological behavior of TiAlSiCN coating at evaluated temperatures. Results showed that TiAlSiCN coating exhibited excellent wear resistance at room temperatures due to the formation of diamondlike carbon (DLC), but suffered aggravated oxidation damage and graphitization of DLC with the increased service temperature. The graphitized DLC severely weakened the toughness of the coating texture, resulting in degraded wear resistance, while the severe oxidation erosion seriously weakened the lubrication efficacy and wear resistance of the top oxide composite layer. The significant synergistic damage effect of oxidation graphitization eventually resulted in the deteriorated anti-wear performance of this coating. These current findings provide insights into the wear failure mechanism of DLC doped coating at evaluated temperatures.