Heat Insulation Materials Which A Few Kinds Are Divided Into?
Heat Insulation Materials Insulation is divided into porous materials, thermal reflective materials and vacuum materials three categories. The former utilizes the pore heat insulation contained in the material itself, because air or inert gases in voids are very low thermal conductivity, such as foam materials, fiber materials, etc. Thermal reflective material has a high reflective coefficient, can reflect the heat out, such as gold, silver, nickel, aluminum foil or gold-plated polyester, polyimide film, etc.
Heat Insulation Materials Vacuum insulation material is to use the internal vacuum of materials to achieve barrier convection to heat insulation. Aerospace industry for the use of thermal insulation material weight and volume requirements are more stringent, often also require it with sound insulation, damping, anti-corrosion and other performance. The needs of various kinds of aircraft are different for thermal insulation. The aircraft cabin and cockpit are commonly used foam, superfine glass cotton, high silica oxygen cotton, vacuum insulation board to heat insulation. Missile head insulation materials used in the early stage of phenolic foam plastics, with the application of good temperature resistance polyurethane foam, and the development of a single insulation material for the sandwich structure.
Heat Insulation Materials The heat insulation method of the missile instrument cabin is coated with a layer of millimeter thick foam coating on the outer skin of the cabin, as the anti-corrosion coating at ambient temperature, when the pneumatic heating reaches 200 ° C above, then the foaming and heat insulation effect is evenly. Man-made Earth satellite is a high-temperature, low temperature alternating environment movement, the use of high reflective multilayer insulation material, generally by dozens of-storey aluminum-coated film, aluminum-coated polyester film, aluminum coated polyimide film composition. In addition, the development of the surface insulation tile has successfully solved the thermal insulation problem of the space shuttle, and also marks a higher level of thermal insulation.
Heat Insulation Materials Aerogel is a new type of thermal insulation material, its nano-size porous materials, used for pipeline insulation, insulation, etc., the thermal conductivity of the material at room temperature for 0.018W/(K-m), low temperature can be to 0.009W/(k m).
Heat Insulation Materials Vacuum insulation Board is the latest thermal insulation materials, widely promoted in foreign countries, many used in household appliances, such as the heat conductivity of the material is very low only 0.004. So the effect of heat preservation and energy-saving above is prominent. The current domestic refrigerator containers have been fully used in this material.
Heat Insulation Materials Naki heat insulation Soft carpet is a kind of thermal insulation material with strong performance.
Heat Insulation Materials Thermal insulation (adiabatic material) type is different, different heat conductivity. The material composition of thermal insulation materials is different, and its physical heat property is different, and the thermal insulation mechanism is distinguished, and its heat conduction performance or thermal conductivity varies.
Heat Insulation Materials Even for the same material, the internal structure of the insulation, or the production of different control processes, the thermal conductivity of the difference is sometimes large. For the solid thermal insulation material with low porosity, the thermal conductivity of the crystalline structure is the largest, the second of the micro-crystalline structure and the smallest vitreous structure. But for the high porosity thermal insulation material, because the gas (air) the influence of the thermal conductivity of the main function, the solid part of whether it is crystalline structure or glass structure, the impact of thermal conductivity is not very much.