High temperature resistant wave-transmissive material is a multifunctional dielectric material that can protect the communication, telemetry, guidance, detonation and other systems of the aircraft under normal weather conditions. It is widely used in spaceships, missiles, launch vehicles and return On reentry vehicles such as satellites, the application form can be divided into radomes and antenna windows.
The main measurement standards of high temperature resistant wave-transmitting materials are dielectric properties, thermal shock resistance and mechanical properties, etc. The above properties correspond to the requirements of wave transmission, heat insulation and load bearing, respectively. Commonly used wave-transmitting materials mainly include organic fibers represented by aramid fibers and inorganic fibers represented by quartz fibers. Organic fiber materials have poor heat resistance, low strength, and are prone to aging and deformation.
They are no longer suitable for making wave-transmitting components in aircraft. Among inorganic materials, quartz fiber is an inorganic fiber material with relatively good wave-transmitting properties and dielectric properties.
Quartz fiber can work in the environment of 1050 ℃ for a long time. At the same time, in the region of high frequency and below 700 ℃, quartz fiber has the lowest and most stable dielectric constant and dielectric loss, and at the same time retains more than 70% strength, it can be used The reinforcement of the high-temperature wave-permeable ceramic matrix composite material is an inorganic fiber material that has been applied and has relatively high comprehensive performance, high temperature resistance, wave penetration and good dielectric properties. Quartz fiber also has the characteristics of corrosion resistance. In addition to hydrofluoric acid and hot phosphoric acid, other liquid and gaseous halogen acids and ordinary acids and weak bases have no effect on it, and they are also insoluble in water and organic solvents.
May-12-2020