Abstract:
A sol-gel method of preparing a powder for use in forming a glass is provided, along with methods of preparing glasses and glass fibers from the powder. The inventive method allows for the incorporation of a wide range of elements and compositions into a homogeneous glass or glass fiber that is substantially free of hydroxide groups. In addition, dopants incorporated into glasses prepared by the inventive method are uniformly distributed throughout the glass structure.
Abstract:
The present invention is directed to a method for making silica. A liquid siloxane-containing feedstock capable of being converted by thermal oxidative decomposition to SiO2 is provied and introduced directly into the flame of a combustion burner, which converts the compound to silica, thereby forming finely divided amorphous soot. The soot is vaporized at the conversion and/or deposition site where the liquid is converted into silica by atomizing the liquid with a stream of oxygen gas, or a mixture of oxygen gas and other gas, such as nitrogen. The amorphous soot is deposited on a receptor surface where, either substantially simultaneously with or subsequently to its deposition, the soot is consolidated into a body of fused silica glass, such as an optical fiber preform.
Abstract:
PROBLEM TO BE SOLVED: To obtain glass having a large size and containing CaO and P 2 O 5 . SOLUTION: A crack-free glassy object is formed by forming an aqueous or water-containing dispersion, adding P 2 O 5 and CaO, adding an acid in order to reach a pH-value of 2±0.5, adding tetraethyl ortho-silicate (TEOS), titrating the sol by means of ammonium hydroxide till pH 4.1±0.2, pouring the sol so obtained into a mold, substituting a solvent in the gel pores with an aprotic solvent, setting gel in a pressure chamber, fluxing an inert gas into the pressure chamber, heating the pressure chamber over a programmed time period to achieve pre-determinate temperature and pressure values lower than the relevant critical value of the gel solvent, evaporating the solvent, depressurizing the pressure chamber, washing by an inert gas, cooling the dried gel, taking out the gel from the pressure chamber and heating at a prefixed temperature to sinter. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
Production of glass bodies made from doped quartz glass by flame hydrolysis comprises adding precursors to the fuel to form the doped quartz glass and producing a first blank (24) on a target (28). Independent claims are also included for the following: (1) process for the production of an extreme ultraviolet light component from the blank; and (2) glass body made from doped quartz glass.
Abstract:
A titania-doped quartz glass which experiences a reduction in OH group concentration of less than or equal to 100 ppm upon heat treatment at 900°C for 100 hours is suitable as the EUV lithography member.
Abstract:
La présente invention se rapporte à un résonateur thermocompensé pour pièce d'horlogerie comprenant au moins une portion fabriquée dans un verre, le verre comprenant, en pourcent massique, entre 65% et 99% d'un oxyde de silicium, entre 0.01 % et 1.5% d'un oxyde d'aluminium, au moins un premier métal alcalin ou un premier métal alcalino-terreux, et jusqu'à 0.5% d'un additif comprenant au moins un second métal alcalin ou un second métal alcalino-terreux, différent du premier élément alcalin ou alcalino-terreux. L'invention concerne également une pièce d'horlogerie, un mouvement d'horlogerie ou autre instrument de précision comportant un tel résonateur.