Fused silica, therefore, has high working and melting temperatures. It is widely applied for halogen lamp,meroury lamp, single-ended lamp, automobile lamp, stage lamp, thermocouple, printer lamp, sleeve for water treatment lamp, quartz utensils and ploes,etc. Glass is an amorphous (non-crystalline) solid material. These lenses are used for UV photography, as the quartz glass has a lower extinction rate than lenses made with more common flint or crown glass formulas. Application: Due to these capabilities, quartz panel is a qualified optical material in many demanding applications. Further processing of trim cutting, bowing, firepolishing can be done according to the demand of the customers. And hence, a substance with higher melting point would be more stable. The MP of Quartz, which is the crystalline phase which is "melting" is about 1720C, depending on impurity levels. [3] and are available online. Type I is produced by induction melting natural quartz in a vacuum or an inert atmosphere. sheathe electric elements in room heaters, "Quartz vs. Fused Silica: What's the Difference? Fused quartz can be metallised and etched for use as a substrate for high-precision microwave circuits, the thermal stability making it a good choice for narrowband filters and similar demanding applications. Kinross Scotland Thus, it can effectively prevent harm to the skin of people and objects that have to be under explosion of UV radiation and set out the maximum visible light at the same time. Quartz has a very high melting point and is chemically inert, and so, is employed into making quartz crucibles that are used in the laboratories for performing chemical reactions and tests. Quartz glass is a highly pure silicate glass with a coefficient of expansion even lower than borosilicate glass and an even higher melting point. Quartz has been widely used in illumination, laser, sterilization, lab equipment, insulator, chemical equipment, heater, etc. It can be worked at 1100°C for a long period while for a short period it can endure 1450°C. Its chemical inertia or stabilization is hardly comparable by any other common material. ", "Optical Constants of Silica Glass From Extreme Ultraviolet to Far Infrared at Near Room Temperatures", "Transparent Armor Ceramics as Spacecraft Windows", "Eternal 5D data storage via ultrafast-laser writing in glass", An Overview of MEMS Inertial Sensing Technology, "Interspecimen Comparison of the Refractive Index of Fused Silica", Surface tension and viscosity measurement of optical glasses using a scanning CO2 laser, "Refractive Index of Fused Silica (Fused Quartz)", Fused Silica Wafers for Research & Development, "Frozen Eye to Bring New Worlds into View", https://en.wikipedia.org/w/index.php?title=Fused_quartz&oldid=989200016, Articles with unsourced statements from October 2020, Wikipedia articles needing clarification from May 2014, All Wikipedia articles needing clarification, Wikipedia articles needing clarification from November 2016, Creative Commons Attribution-ShareAlike License. All grades of transparent fused quartz/fused silica have nearly identical mechanical properties. This results in a transparent glass with an ultra-high purity and improved optical transmission in the deep ultraviolet. Remelting the raw glass in a vacuumed electric-heating furnace is an instrumental technique for removal of gas impurities. It is mainly used for ozone-free germicidal lamp and others. This equation is valid between 0.21 and 3.71 µm and at 20 °C. The advantages quartz crucibles offer includes low expansion, thermal shock resistance, and excellent dimensional stability. Fused silica is also used to form the windows of manned spacecraft, including the Space Shuttle and International Space Station.[5]. "UV grade" synthetic fused silica (sold under various tradenames including "HPFS", "Spectrosil", and "Suprasil") has a very low metallic impurity content making it transparent deeper into the ultraviolet. Spectrum transmission at 185nm is 0 and no ozone. The thermal expansion coefficient of quartz is so low that it can endure steep temperature change. The optical dispersion of fused silica can be approximated by the following Sellmeier equation:[9]. Fused quartz begins to soften at about 1700°C. It differs from traditional glasses in containing no other ingredients, which are typically added to glass to lower the melt temperature. Owing to its low mechanical damping at ordinary temperatures, it is used for high-Q resonators, in particular, for wine-glass resonator of hemispherical resonator gyro.[7][8].
2020 melting point of quartz glass