A long period of time, various countries for various brands of domestic production of optical glass composition is strictly secret, if a country once by other countries obtain optical glass composition and optical glass after a successful trial, they often still use these "classical" formula and little improvement, or just rely on the experience of local regulation such as: three. Silica, boron oxide, phosphorus oxide, sodium oxide and potassium oxide five, calcium oxide, barium oxide, Magnesium Oxide, Zinc Oxide, and alumina etc.. After the melting of these materials, the material is cooled and condensed into a homogeneous, brittle, non crystallized substance. Glass glass is mainly used as optical glass material, which can be divided into two categories: colorless and colored optical glass. There are many kinds of optical glass, which can be divided into two kinds of glass and flint glass based on the refractive index of the colorless optical glass or the size of Abbe.
The production process of quartz glass is as follows:
One, manufacturing melting furnace: there are two kinds of clay furnace and white gold furnace in the melting furnace. In recent years, small white gold furnaces have been used in optical glass infiltrating the rare elements to maintain quality stability.
Two, put the raw material of optical glass: melting furnace (especially clay furnace), after a long time of drying, put it into the melting furnace according to the special formula and selected raw materials, and prepare for melting.
Three, heating, melting, stirring: heating conditions, depending on the material. However, all kinds of materials must be stirred and uniform in order to be homogeneous.
Four, cooling: "Xu Leng" for a long time. However, the length of time is also different from the material, which is the most important process to ensure good quality.
Five, chopping furnace, selection: split clay furnace, remove lump rough embryo and select it.
Six, check, test, integer: check or test each performance item by item to ensure the fine quality of quartz glass.
Seven, cut off, chamfering (trimming): cut the lump of rough embryos into small blocks and chamfering according to their use and specifications.
Eight, the embryo molding: after the rough embryo is heated and softened, the embryo is formed according to the specifications of the engineering drawing. However, it is necessary to make or prepare various moulds, tools and auxiliary materials in advance.
Nine, burning blunt: anneal passivation, eliminate internal stress.
Ten, test and check: test the optical properties and appearance of the embryo. The finished product of optical quartz glass will become the hair of the downstream industry (optical component manufacturing plant), and it will continue to be lapped and become an optical component.
The gas (gas) produced from the raw material at the time of melting will remain in the glass, like a foam, as a bubble. The traces of stirring will also remain in the interior of the glass, like stripes, called veins.
Except for optical quartz glass, the main component of the whitet is the sodium calcium silicate system. The refractive index is 1.51. The transmittance of visible light is more than 89%, which can absorb ultraviolet light below 280nm. The main composition of the optical white film is the sodium calcium silicic acid system, the refractive index is 1.531, the Abbe number is 60.5, the transmittance is over 91%, and the anti ultraviolet performance is the worst. UV optical white sheet is added with a small amount of titanium oxide and cerium oxide in the components of the optical white sheet, so that it has the ability of absorbing ultraviolet. The refractive index is 1.523, the Abbe number is 58.7, the transmittance is 91%, and it can absorb ultraviolet below 330nm. With good mechanical and chemical stability, it is a white high quality lens which is widely used to absorb ultraviolet light at home and abroad.