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The superalloys are the better candidate materials for the high temperature application due to their superior mechanical strength and higher corrosion resistance at service temperature. Nickel-based superalloys are used as components of gas turbines of jet engines. Since these components are subjected to high temperature, their performance is drastically affected by environmental conditions. The studies were performed on bare Substrate as well as on coated samples in the super heater zone of a coal fired boiler where the temperature was around 700±10°C for 500 hours. The morphologies of the scale and compositional analysis were characterized by using Atomic Force Microscopy, XRD and field emission scanning electron microscopy / energy dispersive analysis. The coated specimen showed good adherence to the substrate with negligible microspalling of the scales. The nanostructured coating imparted better hot corrosion resistance than the bare substrate in the given environment.

The creation of single, negatively charged silicon vacancy ( SiV −) centers in well-defined diamond layers close to the host surface is a crucial step for the development of diamond-based quantum optic devices with many applications in nanophotonics, quantum sensing, or quantum information science. Here, we report on the creation of shallow (10 nm below the surface), single SiV − centers in diamond using low energy Si + ion implantation with subsequent high temperature annealing at 1500 °C. We show transition linewidths down to 99 MHz and narrow inhomogeneous distributions. Furthermore, we achieved a reduction of homogeneous linewidths by a factor of 2 after removing subsurface damage using oxygen plasma processing. These results not only give insights into the formation process of SiV − centers but also indicate a favorable processing method to fabricate shallow single quantum emitters in diamond perfectly suited for coupling to nanostructures on the diamond surface.