Introduction to the cold processing of optical glass and the composition of optical glass lenses
Glass has a long history and stable properties. It is an excellent material that has stood the test of time. It can not only be used for decoration, but also play an important role in various optical instruments, and can even be used to help buildings save energy and reduce noise. By using different processing methods, we can make glass have different characteristics. 1. What is optical glass? Cold processed optical glass (optical glass) is a glass material used to manufacture lenses, prisms, mirrors, windows, etc. of optical instruments or mechanical systems. Including colorless optical glass (usually referred to as optical glass), colored Optical glass, radiation resistant optical glass, radiation protection glass and optical quartz glass, etc. Optical glass has a high degree of transparency, chemical and physical (structure and performance) high uniformity, with specific and accurate optical constants. It can Divided into silicate, borate, phosphate, fluoride and chalcogenide series. Cold processing technology is a kind of use of chemical vapor heat treatment and a single piece of soda lime silica glass to change its original molecular structure without affecting the original glass The color and light transmittance make it reach the ultra-hardness standard, and the ultra-hard fire-resistant glass and its manufacturing method and special equipment that meet the fire-proof requirements under high-temperature flame impact. It is made of the following weight ratio components: potassium Salt vapor (72%~83%), argon gas (7%~10%), gaseous copper chloride (8%~12%), nitrogen (2%~6%). It contains the following process flow: Sodium calcium The silicon glass is cut for the substrate, and the cold processing of the fine grinding edge → chemical vapor heat treatment of the cold processed soda lime silica glass → the surface of the soda lime silica glass is coated with a fire protection film → the surface of the soda lime silica glass is subjected to special physics Tempering treatment. A special thermal decomposition and gasification equipment is formed by the cylinder body, the cylinder head that is nested with it, and the reaction kettle integrally connected with the cylinder head. Second, the composition of the optical glass lens The optical glass is made of high-purity silicon and boron The oxides of, sodium, potassium, zinc, lead, magnesium, calcium, barium, etc. are mixed according to a specific formula, melted in a platinum crucible at high temperature, stirred with ultrasonic waves to remove bubbles; then slowly cool down over a long period of time to avoid the production of glass blocks Internal stress. The cooled glass block must be measured by optical instruments to check whether the purity, transparency, uniformity, refractive index and dispersion rate meet the specifications. The qualified glass block is heated and forged to form an optical lens blank. The production of optical glass The raw materials are some oxides, hydroxides, nitrates and carbonates, and phosphates or fluorides are introduced according to the requirements of the formula. In order to ensure the transparency of glass, the content of colored impurities, such as iron, chromium, copper, manganese, cobalt, nickel, etc., must be strictly controlled. When ingredients are required, accurate weighing and uniform mixing are required. The main production processes are smelting, forming, annealing and inspection.