Analysis of 5 typical special glass materials

time：01st January 70

     Special glass is a kind of glass with special function through light, electricity, magnetism, heat and chemistry. It is the key and basic material of important production and life. Due to the incomparable high and new characteristics of ordinary glass, special glass occupies an irreplaceable position in the field of modern science and technology, and its outstanding characteristics are closely related to the emerging industries and national defense needs. At present, more and more attention has been paid to the development and application of high performance special glass materials in the world. The research and production level of special glass has become one of the important signs of the material development level of a country.
    Here are a brief introduction to 5 typical types of special glass materials.
    1. through infrared glass
    Infrared material is the foundation of infrared technology industry, and the development of infrared technology is the precursor and symbol of infrared material development. At present, the infrared materials are mainly divided into single crystal, polycrystalline and infrared glass according to their shape, properties and preparation methods. Infrared glass not only has better infrared transmittance, excellent optical homogeneity, higher mechanical strength, but also has low manufacturing cost, simple optical processing technology, and can be processed into complex shaped products and attracted much attention.
    At present, infrared glass is widely used in infrared detection technology and infrared imaging technology as windows, lenses, fairing and so on. Since 90s of last century, western developed countries, Russia, the United States and Britain have invested heavily in research on infrared and infrared photoelectric glass, glass material assembled in key model aircraft (term "photoelectric" provided by industry Encyclopedia) detection system, greatly enhance the combat capability.
    For example, the development of large size U.S. Naval Research Laboratory (00mm) barium gallium germanate glass infrared pod and Moscow Technical Glass Research Institute developed caliber (250mm calcium aluminate glass dome have mass equipment of airborne photoelectric radar system.
    2. radiation resistant glass
    Radiation resistant glass is a kind of special glass with small attenuation of visible light transmittance after irradiation by high energy ray or particle bombardment. Radiation resistant glass has many advantages, such as good radiation stability, light transmittance and stable physical and chemical properties. It is mainly used as window material in aerospace, nuclear industry and medicine.
    At present, the United States Corning company and British Pilkington company in the world leading level in the field of research and production of radiation resistant glass, they are used with the method of melt directly after drawing, the surface of the glass plate production width reaches 400mm. The minimum thickness is 0.05mm, the forming surface is a free surface, the bending strength of glass (entry "the flexural strength" provided by industry Encyclopedia) reached 130 150MPa.
    3. special dispersive glass
Most optical glasses are in a straight line in the relation graph of relative chromatic dispersion 22 and Abbe number v. This line is called the normal line". Special dispersive glass is a kind of optical glass far away from the normal line. The main performance characteristics of special dispersion glass is relative partial dispersion deviation, optical system in combination with other glass can reduce the number of optical glass lenses, simplify the system structure, it is particularly important to eliminate the spectrum level two, improve the image quality and geometric accuracy, meet the performance of long focal length and wide field of view and high the precision requirements of the optical system.