4 meters large diameter silicon carbide ase sperge optical mirror developed successfully

China Coatings Online News
"We have completed the manufacture of high-precision silicon carbide (SiC) aseque sperge mirrors with a diameter of 4.03 meters, and have independent intellectual property rights for their core manufacturing equipment and manufacturing processes." Zhang Xuejun, deputy director of the Changchun Light Machine Institute of the Chinese Academy of Sciences, was introduced at the project acceptance meeting on the 21st.
large-caliber high-precision astro-optical mirror is the core component of high-resolution space-to-Earth observation, deep space exploration and astronomical observation system, and its manufacturing technology level is of great significance to national defense security, national economic construction and basic scientific research capabilities.
as a highly stable optical mirror material, silicon carbide material has lighter mass, higher stiffness and thermal stability. However, due to the relevant technical conditions, for a considerable period of time, the maximum diameter of the internationally reported monobial silicon carbide mirror is only 1.5 meters.
Zhang Xuejun led the team to find another way, experienced hundreds of experimental exploration and process verification, broke through a number of mirror blank preparation key technologies, established a large-caliber silicon carbide blank manufacturing platform, and has successfully developed can be used for visible light imaging 2 meters, 2.4 meters, 3 meters calibre monobial silicon carbide mirror blank and 4 meters caliber overall silicon carbide blank.
to develop a mirror blank is only the first step. As the core element of large-diameter photoelectrical equipment, the surface precision and surface quality of the mirror are very high. "The difference between the southeast and northwest corners is within plus or minus a few millimeters after the flattening of a piece of land the size of a piece of Land in Beijing, and its structure is stable under such an accuracy requirement." Zhang Xuejun introduced that in the preparation of silicon carbide materials made a breakthrough, they also overcome two other technical bottlenecks - large-calibre silicon carbide asetic processing detection and high-performance modified, coating.
meeting, the Chinese Academy of Sciences Changchun optical machine to assume the "4m magnitude high-precision SiC aseher sphericic mirror integrated manufacturing system" project passed the acceptance. The acceptance expert group believes that the project has formed a large-caliber series of mirror development capability, which is a major technological breakthrough in the field of large-calibre optical manufacturing in China.
。