The present research deals with the deposition of carbon nanotubes (CNT) over the HSS tool, and to evaluate the machining performance of the coated tool with respect to the important machinability aspects like cutting tip temperature, cutting forces, surface roughness and tool wear and life. The plasma enhanced chemical vapour deposition (PECVD) technique was employed to deposit CNTs over the substrate. Microstructural investigations through SEM and Raman spectroscopy were carried out to acknowledge the dense deposition of CNTs. Scratch test was also performed to validate the bonding strength of the coated layer with the substrate. Machining experimental results under three different cutting conditions, concluded that the CNT coated tool is the right potential candidate for turning tougher materials. Drastic depletion in cutting tip temperature and cutting forces to the extent of 70 to 80 % was observed for coated tool due to the excellent mechanical and thermal properties of CNTs. However, there was no significant effect of coating to influence the surface roughness at a lower level of cutting conditions, but considerable improvement has been observed at elevated cutting condition. The tool wear and life analysis explored the steady improvement to a remarkable extent. Very specifically, under elevated machining conditions, tool life investigations concluded the fact that the CNT coated tool has a tool life of more than 60 minutes with negligible failure.

本研究涉及在HSS工具上沉积碳纳米管（CNT），并就重要的可加工性方面（如切削刀尖温度，切削力，表面粗糙度以及工具的磨损和寿命）评估涂层工具的加工性能。 。采用等离子增强化学气相沉积（PECVD）技术在基板上沉积CNT。进行了通过SEM和拉曼光谱的微观结构研究，以确认CNT的致密沉积。还进行刮擦测试以验证涂层与基材的结合强度。在三种不同切削条件下的机加工实验结果表明，碳纳米管涂层刀具是车削坚硬材料的正确潜在候选者。由于碳纳米管具有出色的机械性能和热性能，因此对于涂层工具，观察到切削刃温度和切削力的急剧消耗达到70％至80％。但是，在较低的切削条件下，涂层对表面粗糙度的影响没有明显的作用，但是在较高的切削条件下，已观察到相当大的改善。刀具磨损和寿命分析在很大程度上探索了稳步提高。具体地说，在较高的加工条件下，刀具寿命研究得出这样一个事实，即涂有CNT的刀具具有超过60分钟的刀具寿命，而可以忽略不计的故障。在较低的切削条件下，涂层对表面粗糙度的影响不明显，但在较高的切削条件下，已观察到相当大的改善。刀具磨损和寿命分析在很大程度上探索了稳步提高。具体地说，在较高的加工条件下，刀具寿命研究得出这样一个事实，即涂有CNT的刀具具有超过60分钟的刀具寿命，而可以忽略不计的故障。在较低的切削条件下，涂层对表面粗糙度的影响不明显，但在较高的切削条件下，已观察到相当大的改善。刀具磨损和寿命分析在很大程度上探索了稳步提高。具体地说，在较高的加工条件下，刀具寿命研究得出这样一个事实，即涂有CNT的刀具具有超过60分钟的刀具寿命，而可以忽略不计的故障。