What is a chameleon coating?
Chameleon coating is a type of surface layer applied to various produced goods that have adaptive properties. It usually consists of materials designed on a nanotechnological scale around the size of individual atoms or small molecules. The coatings are designed to have properties such as the ability to change the surface texture or respond dynamically to humidity, temperature extremes or vacuum environments, such as repeatedly usable vehicle coatings in missile. Composite coatings are often used, which are in the coating consisting of several layers of different materials to be self -proclaimed and lower than the normal melting point.
The first types of wear coatings created in the Nano scale were based on the tungsten element, because it is such a widely used metal metal metal parts. Compounds such as toilet, tungsten merged with diamond carbon (DLC) and tungsten disulfide, ws 2 were examined. Metals likewolfram and yttrium are often part ofChameleon coating, because their lubrication quality is provided by dry lubricants in the form of driven carbon, sulfur or other nanoparticles that interact with them. Gold and silver AR, e other frequent metal elements, because they have the ability to withstand a high level of temperature gradient, where they can show lubricating properties when they are built into the matrix structure. Graphitic carbon is also included in some formulas as a useful sliding surface in the presence of water or high humidity.
An example of what is considered to be a second generation chameleon paint since 2004 is a Yttria stabilized Zirconia (YSZ), a form of ceramics that is built into a structure similar to gold grid that details of the Molybdenus disulfide, Mos 2 2 2 2 2 2 2 2 2 2 22 2 2 2 2 2 2 2 2 . This particular composition of the chameleon coating can be entered by 10,000 repetitions or more without humiliation and temperature up to 932 ° to 112 ° Fahrenheit (500 ° to 600 ° Celsius). This brought interest in various production concerns in the aerospace industry. Such chameleon coatings are designed to have tribological properties where tribology refers to the ability of the coating to resist friction, wear and also of course aspects.
The key aspect of any chameleon coating is that it has a reversible morphology to its composition. The coating must be able to change their friction and wear in response to the conditions and then change back to a latent state without chemical degradation. Arena, where it is important, involves in the construction of structural and aerodynamic elements for hypersonic vehicles, which are subject to extreme physical stress at high altitudes and speeds.
chameleon KovlAK is designed to have an extensive change in material properties from Scale of one trillion meter to a tenth of a millimeter (0.0000000001 to 0.0001 meters). Research in March 2011 for the US Army created a chameleon coating composed of nitride compounds, silver and MOS 2 , which set a world record for durability. The material was cycled over 300,000 times from the temperature of the room to 1,292 ° Fahrenheit (700 ° Celsius) without any noticeable degradation of the material properties.