Borosilicate glass

Borosilicate glass is a glass with enhanced fire resistance.
The manufacturing process is adding glaze water glass sand, soda water and lime. Since high borosilicate glass has a higher melting temperature than ordinary silicate glass, some new technologies and processes are required in the manufacturing process.
Manufacturing processedit
Borosilicate glass manufacturing, adding water glass sand, soda water and ground lime with the glaze of boron traditional glass manufacturing. Since borosilicate glass melts at a higher temperature than ordinary silicate glass, some new technologies are needed to enable industrial production. [1]
Widely usededit
High borosilicate glass has good fire resistance and high physical strength. Compared with common glass, it has no toxic and side effects. Its mechanical properties, thermal stability, water resistance, alkali resistance, and acid resistance are greatly improved. Therefore, it can be widely used in various fields such as chemical industry, aerospace, military, family, hospital, etc. It can be made into various products such as lamps, tableware, standard plates, telescope pieces, washing machine observation holes, microwave oven plates, solar water heaters, etc., with good promotion Value and social benefits.
Borosilicate glass is an important material used to make high-durability glass instruments such as beakers and test tubes. Of course, its applications are far more than these, other applications such as vacuum tubes, aquarium heaters, flashlight lenses, professional lighters, tobacco pipes, glass ball artworks, high-quality beverage glassware, solar heat utilization vacuum tubes, etc. , Has also been applied in the aerospace field. For example, the insulation tiles of the space shuttle are also coated with high borosilicate glass. [1]
Borosilicate glass has a very low thermal expansion coefficient, only about one third of that of ordinary glass. This will reduce the influence caused by the temperature gradient stress, which will have stronger fracture resistance. Because of its very small shape deviation, this makes it an indispensable material in telescopes and mirrors, and it can also be used to process high-level radioactive nuclear waste. Even if the temperature changes suddenly, the borosilicate glass is not easily broken. When broken, the high borosilicate glass will have large cracks instead of being crushed into particles. At the same time, high borosilicate glass also has low dispersion and relatively low refractive index.
The linear expansion coefficient of borosilicate glass G3.3 is (3.3±0.1)×10-6/K, which is based on sodium oxide (Na2O), boron oxide (B2O3), and silicon dioxide (SIO2) as one of the basic components. Kind of glass. The borosilicate content of the glass composition is relatively high, namely boron: (12.5~13.5)%, silicon: (78~80)%.

Influence editor
In the process of using float glass to produce high borosilicate glass, the amount of surface tin infiltration, the valence state of tin infiltration and the depth of tin infiltration have a greater impact on the quality of float glass and the deep processing of the glass, and the amount of tin infiltration seriously affects the quality of glass in deep processing .
Compared with high borosilicate glass and soda-lime silica glass, if the temperature at the front end of the tin bath is increased by about 300°C, the vapor pressure of tin is increased by 142 times. In this way, when the float process produces high borosilicate glass, the glass liquid seems to be in a tin vapor bath. At the same time, because the temperature of producing high borosilicate glass is increased by several hundred degrees, the activity of tin ions is greatly enhanced, and tin ions penetrate into the glass electrode. The surface capacity is greatly enhanced, and the possibility of increasing the amount of tin infiltration is greatly increased. The influence of tin infiltration on the change of the glass surface properties is greater. This is one of the problems that need to be solved by the float glass process [2].
Life productsedit
Because high borosilicate glass has a very low coefficient of thermal expansion and high temperature resistance, it is used to make halogen lamp reflective heat-resistant lampshade, microwave oven special glass turntable, microwave oven lampshade, stage lighting reflector cup, drum washing machine observation window, heat-resistant teapot and tea cup , Solar collector tubes and other important materials.

Post time: Dec-16-2020