Stealth aircraft can be "stealth" mainly by using a series of invisible high-tech, including invisible materials for the body skeleton and skin, invisible coating materials on the surface, invisible structure, infrared radiation reduction technology, noise reduction technology and electronic interference Technology, etc. There are several types of invisible materials for the manufacture of stealth aircraft skeletons and skins. The most commonly used are carbon fiber reinforced resin composites, carbon fiber and carbon matrix combined carbon-carbon composite materials, and silicon carbide wire reinforced aluminum composites. These composite materials are lightweight and capable of absorbing radar waves. A honeycomb core material is also used as a lining in the skin of the U. S. B. -2 stealth bomber to further improve the body's ability to absorb radar waves. In order to obtain the perfect double-safety effect, the entire surface of the fuselage is also coated with a layer of nickel-cobalt ferrite, or a stealth coating composed of metal and metal oxide ultra-fine powder. This coating can make the radar irradiated. The magnetic loss of the wave increases, which plays the role of absorbing and transmitting waves. The most suitable for this text title is:. ['Outer coating and fuselage materials help aircraft stealth.', 'Demystifying stealth materials that can make aircraft invisible.', 'Special coatings are the key to aircraft invisibility.', 'Reasons why stealth aircraft can be invisible.']