Titanium nitride (TiN) thin film coatings were grown over silicon ($p$-type) substrate using the atmospheric pressure chemical vapour deposition (APCVD) technique. The synthesis process was carried out to evaluate the effect of deposition time on the physical and mechanical characteristics of TiN coating. Thin films grown over Si substrate were further characterised to evaluate the morphological properties, surface roughness and mechanical properties using a scanning electrode microscope (SEM), atomic force microscopy (AFM) and nanoindentation, respectively. EDS equipped with SEM showed the presence of Ti and N elements in considerable amounts. TiN morphology obtained from the SEM test showed small-sized particles on the surface along with cracks and pores. AFM results revealed that by increasing the deposition time, the surface roughness of the coating also increased. The nanomechanical properties such as nanohardness ($H$) and Young’s modulus ($E$), etc., evaluated using the nanoindentation technique showed that higher deposition time led to an increase in $H$ and $E$. Overall, it was observed that deposition time plays a vital role in the TiN coating deposition using the CVD technique.

Friction drilling is a new trend of hole making process in which the frictional force between the tool and work material is used for hole making, by thrusting of the tool into the work material without chips formation as like conventional drilling. During friction drilling ductility of the material increases with heat, which causes the material to extrude on the front and backsides of the hole, which forms the boss and bush respectively on the work piece, so it provides the required projection for threading. The damage to the surface occurring during the hole making, takes place at high temperature, which could be monitored using thermography. By using this technique damages occur during manufacturing can be monitored and minimized. Due to high temperature during drilling various phenomena like thermal phase transition, plastic flow of material and extrusion may occur, which directly influences mechanical properties and may cause plastic material from the hole surface. Friction drilling is used for hole making process of aerospace, automotive, commercial and industrial products.