What are the properties of hot pressed Magnesium Fluoride MgF2
Thermocompressed Magnesium Fluoride MgF2 infrared material is a key component of the missile as an infrared window and fairing for an infrared-guided missile.
Thermocompressed Magnesium Fluoride MgF2 infrared material is a key component of the missile as an infrared window and fairing for an infrared-guided missile. It must have good optical properties to ensure the quality of infrared detection; it can also work in harsh environments and withstand missiles. Aerodynamic shock in high-speed flight, thermal shock caused by aerodynamic shock heating, mechanical and chemical corrosion of wind, sand, rain, snow, acid and alkali, seawater, etc., can protect the optical system and sensors inside the missile from damage by the external environment Impact.
Therefore, in addition to optical properties such as high infrared transmittance, low scattering, birefringence and thermal radiation, infrared materials are also required to possess good mechanical, thermal and chemical properties. At the same time, the material is required to have good processing properties to facilitate the optical processing of various geometric window and fairing products.
The infrared transmittance of hot-pressed Magnesium Fluoride MgF2 is between 0.7-9μm, and in the 3-7μm band, the infrared transmittance of a sample with a thickness of 2mm reaches 80%. In the 3-5μm mid-wave infrared band, the infrared transmittance of a sample with a thickness of 2mm can reach more than 90%, and the hot-pressed Magnesium Fluoride MgF2 has the highest transmittance among existing infrared window and fairing materials.
Meanwhile, the refractive index of hot-pressed Magnesium Fluoride MgF2 is 1.3812±0.005 (λ=0.5893 μm) under hot-pressing condition, and the coefficient of variation of refractive index with temperature dn/dt is only 1.1×10-6K-1. IR window and fairing material is minimal.