Abstract:
The X-ray opaque glass is characterized by a composition, in mol %, of SiO2, 75-98; Yb2O3, 0.1 to 40; and ZrO2, 0 to 40. Preferred embodiments of the glass are free of Al2O3 and B2O3. The glass is produced from the glass batch by melting at a temperature of at least 1500° C. in an iridium or iridium alloy vessel with the assistance of high-frequency radiation. In preferred embodiments of the glass production process at least one raw material ingredient is present in the batch as a nanoscale powder. The glass is useful in dental applications, optical applications, and biomedical applications, or for photovoltaics, or as a target material in PVD processes.
Abstract translation:X射线不透明玻璃的特征在于以摩尔%计的SiO 2,75-98的组成; Yb2O3,0.1〜40; 和ZrO 2,0至40.玻璃的优选实施方案不含Al 2 O 3和B 2 O 3。 在高频辐射的帮助下,通过在铱或铱合金容器中在至少1500℃的温度下熔融从玻璃批料中制造玻璃。 在玻璃制备方法的优选实施方案中,至少一种原料成分以批量存在于纳米级粉末中。 该玻璃可用于牙科应用,光学应用,生物医学应用,或光伏发电,或作为PVD工艺中的靶材料。
Abstract:
A known quartz glass crucible for crystal pulling consists of a crucible wall, having an outer layer which is provided in an external area thereof with a crystallisation promoter which results in crystallisation of quartz glass, forming cristobalite when the quartz glass crucible is heated according to specified use in crystal pulling. The aim of the invention is to provide a quartz glass crucible which has a long service life. As a result, the crystallisation promoter contains, in addition to a silicon, a first component which acts as a reticulating agent in quartz glass and a second component which is free of alkali metals and which acts as an agent forming separating points in quartz glass. The above mentioned components are contained and incorporated into a doping area (8) of the outer layer (6) having a layer thickness of more than 0.2 mm.
Abstract:
Highly durable silica glass containing 0.01% to 2% by weight of at least one element selected from magnesium, calcium, strontium, barium, yttrium, hafnium and zirconium. The silica glass is produced by melting a powdery material comprising a finely divided silica powder and a finely divided zirconium-containing substance by oxyhydrogen flame or plasma are to form an accumulated molten material layer, and extending the molten material layer outwardly in radial directions.
Abstract:
A synthetic fused silica composition comprising silica and aluminum, wherein said aluminum is generally present in at least 7 parts per million and the composition has a viscosity of at least 1014.5 poise.
Abstract:
A novel copper activated thermoluminescence dosimeter comprising a glass composition having: about 94-97 weight percent SiO.sub.2 ; about 0.4 to 2 weight percent Al.sub.2 O.sub.3 ; about 0.02 to 1 weight percent M.sub.2 O, where M comprises Na.sup.+ or K.sup.+ ; about 2 to 6 weight percent B.sub.2 O.sub.3 ; and Cu(I), where Cu(I) is present at a level between about 10.sup.18 to 10.sup.19 ions/cm.sup.3 ; method of making the same.
Abstract:
High silica glasses exhibiting blue color by transmitted light are produced by impregnating a porous, high silica glass with a solution of cobalt, aluminum, and selected alkaline earth or alkali salts, and then consolidating the glass under oxidizing conditions to dope the glass with the corresponding oxides. The tinted glass has particular utility as a blue filter for lighting applications.
Abstract:
A yellow color by transmitted light is produced in a high silica glass by impregnating a porous, high silica glass with a solution of chromium and zinc salts and consolidating the glass under oxidizing conditions to dope the glass with chromium and zinc oxides, the chromium being predominantly in the hexavalent state. Optionally, an aluminum salt is included in the impregnating solution. The glass has particular utility as a filter for lighting purposes.
Abstract:
Manufacturing method of doped silica glass suitable for optical fiber wherein quartz powder or SiO.sub.2 glass fine particles are exposed to a gas for producing the doped silica glass containing SiCl.sub.4, a gaseous additive and water vapor (H.sub.2 O) to add the dopant to the glass body, and then the resulting glass body is fused at a high temperature, thereby producing a transparent doped silica glass in which the production of the glass particles, the addition of the dopant, and the vitrification of the glass body are carried out by separate steps under respective suitable conditions. The manufacturing speed is remarkably increased because of the separate steps. The content of the dopant is not limited, but can be adjusted with any desired amount by changing the reaction time of dissolution. Dopant components like PbO.sub.2, SnO.sub.2, ZnO which were typically not added to the glass body can now be added thereto. Also, a method of manufacturing an optical fiber preform is disclosed wherein the doped silica glass is deposited and fused on a starting material which is inclined by an angle within a range of 5.degree.-90.degree. with respect to a blow-off direction of the flow of the doped silica glass to form a transparent doped silica glass body having a uniform outer diameter and a uniform boundary surface at a high synthesizing speed. This latter method aids mass production of optical fibers at low cost.
Abstract:
A method of incorporating an additive or dopant oxide in a glass body produced by the flame hydrolysis technique. Particles of the primary glass former are produced by flame hydrolysis and deposited to form a porous body which is impregnated, in part at least, with a dopant which may be dissolved or suspended in a vehicle. The body is then thermally consolidated with the dopant dispersed therein.