A Review Paper on “Vanta-black Color”, “Reinforced Polymer Based Materials/ Radar Absorbing Materials”& “Thermal Infrared Reflective Metal Oxide Sol-gel Coating” Used in “Stealth Vehicle”

Abstract

Every country is doing a lot of research and development work on security and defense. A country like India shares their border with different countries from three sides need a lot of protection on border. Countries are making new armors and weapons with latest technologies so that their border can be protected. With the help of stealth technology, we make any object similar to surrounding environment in term of color (vantablack) and shape. If we use this technology in army jeep and tanks, then enemy will not be able to find out the position of our jeep and tanks on border. Stealth vehicle will be very useful from defense point of view on border. To make the vehicle stealth, we will give a new design to the vehicle, do thermal infrared reflective coating on engine and used super alloy to make the body of the vehicle. By applying thermal infrared reflective coating on vehicle, the vehicle will not emit heat and any heat sensor will not be able to detect the position of the vehicle. Thermal infrared reflective coating will act as heat insulator and will not allow heat to escape from the engine and vehicle body. We will use advanced cooling system to keep the engine temperature under control. The enemy army uses a heat sensor device to detect the vehicle’s position and when the vehicle does not emit heat, the sensor device will become useless. We see the use of thermal barrier coating in aerospace industry where thermal barrier coating applied on engine turbines. Thermal barrier coating concept is similar as Thermal infrared reflective coating. Thermal infrared reflective coatings have anti corrosive properties as well as with stand on high temperature up to 1100⁰C. Thermal expansion that occurs in the turbine blade due to high temperature does not degrade the thermal infrared reflective coating. The outer surface of Aircraft is also an example of high quality thermal infrared reflective coating. The most commonly used thermal infrared reflective coating material is Ferromagnetic Oxide which has extremely high resistance against thermal shock up to 1100⁰C. Ferro-magnetic Oxide increases the durability of thermal infrared reflective coating and it is a rare earth element. Metal Oxide is generally applied on the material as thermal infrared reflective coating by the process of chemical deposition method and physical vapor deposition (diffusion coating methods).