Fused silica is a good electrical insulator, retaining high resistivity at elevated temperatures and excellent high-frequency characteristics. Fused quartz is outstandingly resistant to water, salt solutions and acids. Quartz glass is sensitive to all alkali and alkaline-earth compounds because even slight traces of them hasten devitrification at high temperatures. At first glance, quartz glass appears very simple, both chemically and structurally, since it is made from a single oxide component (silicon dioxide – SiOPegmatite is a special rock type including different mineral assemblages whereby quartz is of interest only.Purity is crucial for most industrial applications and processes.

They can also influence the properties of material processed in contact with the quartz glass during the final use application. For example, machined surfaces tend to be weaker than fire polished ones. Surface condition is very important. Depending on the exact experimental conditions, such as the wavelength, energy density and peak intensities in pulsed laser applications, various kinds of damage can occur to the glass. In addition to these visible damage phenomena, a more subtle damage mechanism can take place as Heraeus offers a variety of information on several websites.

Key Fused Silica Properties: Near zero thermal expansion: Exceptionally good thermal shock resistance: Very good chemical inertness: Can be lapped and polished to fine finishes: Low dielectric constant: Low dielectric loss: Good UV transparency. This causes the material to slightly oxygen deficient, which helps to restrain devitrification.The high resistance of quartz glass to elements and compounds is another advantage for high-end applications. Since the level of these impurities is very low, the electrical resistivity is correspondingly high.Since ionic conduction is related to the diffusion coefficient of the ionic carriers, the resistivity also has a strong exponential temperature dependence. This value changes little over a wide range of frequencies.

Besides transmission ranges can be customized to meet your application by adding e.g. are mixed composition glasses – in addition to SiO2, they include such ingredients as Na2O, CaO, and B2O3. You have not agreed to all cookies, which limits the use of the website and performance. Fused silica, commonly referred to as synthetic fused quartz, is produced using high purity silica sand that is manufactured from SiCL 4. Auf den ersten Blick erscheint Quarzglas sowohl chemisch als auch strukturell sehr einfach, da es aus einer einzigen Oxidkomponente (Siliciumdioxid – SiO 2) besteht.. Chemische Struktur: Die Erdkruste besteht zu einem beträchtlichen Teil aus Quarz. 14 Aug 2020 doping materials.The intrinsic UV and IR absorption edges in silica glass are located at roughly 0.180 and 3.5 microns wavelengths, respectively. These factors have to be considered thoroughly when comparing the strengths of different “brands” of quartz glass. Fused silica is an amorphous material, characterised by its extremely low co-efficient of thermal expansion and resistance to thermal shock. 12 Aug 2020 The theoretical tensile strength of silica glass is greater than 1 million psi. The purities of fused quartz and fused silica are outstandingly high. A number of unique optical, mechanical and thermal properties have made quartz glass an indispensable material in the fabrication of high-tech products. Special precautions must be taken at all stages of manufacture to maintain high purity. These additional ingredients modify the optical and mechanical characteristics of the glass and lower the melt temperature of the mix. In contrast, other common glasses (Pyrex, borosilicate, soda-lime, etc.) The higher viscosity results in an increased maximum use temperature as well as helping to inhibit devitrification. Translume works with Fused Silica (also called fused quartz). Additionally, Heraeus has different purification steps to improve the quality of the quartz sand as raw material even further. The reason for the low dielectric constant is, once again, the lack of highly charged mobile ions but it also results from the stiffness of the silicon-oxygen network which imparts a very low polarizability to the structure.Because it has very low absorption down into the vacuum ultraviolet spectral range (the cutoff is at about 160 nm for a 1 mm thickness), synthetic fused silica is used for lenses in high-energy laser applications and as an envelope material for ultraviolet light sources such as excimer or deuterium lamps. This glass is composed exclusively of high-purity silica (SiO2) in amorphous (non-crystalline) form.

Besides transmission ranges can be customized to meet your application by adding e.g. Synthetic fused silica from Heraeus contains total metallic contamination below 1ppm. Devitrification is also restrained by the neutral/ reducing atmosphere used during melting. The intrinsic IR edge arises due to lattice (multi-phonon) vibrations of the Si-O network.Controlled heat management and sustained high temperatures is crucial in many industrial processes, especially in semiconductor industries. The reason is that the practical strength of glass is extrinsically determined rather than being solely a result of chemistry and atomic structure as is an intrinsic property like density.

Typical Fused Silica Uses: High temperature lamp envelopes: Temperature insensitive optical component supports It is always advisable to remove fingerprints, which contain traces of alkalis, from quartz glass with alcohol before heating.One of the most attractive features of quartz glass is its very low thermal coefficient of expansion (CTE). However, it is important to realize that the thermal shock resistance depends on factors other than CTE such as surface condition (which defines strength) and geometry. You can change your preferences in the

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