摘要:
A method of producing, by flame hydrolysis, a fused silica glass containing titania which comprises delivering a mixture of a silica precursor and a titania precursor in vapor form to a flame, passing the vapor mixture through the flame to form SiO2-TiO2 particles, and depositing the particles within a furnace (40) where they melt to form a solid glass body (44).
摘要:
An opaque silica glass article comprising a transparent portion and an opaque portion, wherein the opaque portion has an apparent density of 1.70 - 2.15 g/cm 3 and contains 5 x 10 4 - 5 x 10 6 bubbles per cm 3 , said bubbles having an average diameter of 10 - 100 µm; and the transparent portion has an apparent density of 2.19 - 2.21 g/cm 3 and the amount of bubbles having a diameter of at least 100 µm in the transparent portion is not more than 1 x 10 3 per cm 3 . The opaque silica glass article is made by a process wherein a mold is charged with a raw material for forming the opaque portion, which is a mixture comprising a silica powder with a small amount of a silicon nitride powder, and a raw material for forming the transparent portion so that the two raw materials are located in the positions corresponding to the opaque and the transparent portions, respectively, of the silica glass article to be produced; and the raw materials are heated in vacuo to be thereby vitrified.
摘要:
A decorative construction material such as a glass tile is produced from recycled glass granulate, and exhibits a smooth, external surface substantially free from defects on one side of the tile. One or two layer tiles may be produced. A binder, together with control of the maximum temperature and temperature gradient in the layers, if applicable, is used during manufacture to ensure a substantially flawless outer surface.
摘要:
A synthetic quartz powder obtained by calcining a powder of silica gel, characterized in that white devitrification spots having sizes of larger than 20 µm in diameter formed in an ingot obtained by vacuum melting the synthetic quartz powder at a temperature of from 1780 to 1800°C to form an ingot, followed by maintaining the ingot at a temperature of 1630°C for 5 hours, are at most 10 spots/50 g.
摘要:
A method for producing a high purity synthetic quartz powder, characterized by using a tetramethoxysilane having a trimethoxymethylsilane content of at most 0.3 wt%, and converting it to a synthetic quartz by a sol-gel method.
摘要:
Synthetic quartz glass powder obtained by the sol-gel method and containing at most five black particles per 50g of the powder. A high-quality quartz glass molding is produced by melt molding the powder while extremely suppressing foaming.
摘要:
A silica glass powder suitable for the production of a silica glass body product of a low silanol content, which is obtained by baking a dried silica gel powder obtained by a sol-gel method, at a temperature of from 1,000 to 1,400°C, wherein during the baking period, the silica gel powder is baked in a gas atmosphere containing from 10 to 100% by volume of steam for at least 5 hours.
摘要:
Gradient optical density transmissive light directing devices (20, 24, 26, 28, 30) and fabrication thereof are disclosed herein. Examples of such devices include concentrators, lenses and compound lenses. The present invention teaches a process for the fabrication of glass light transmitting devices having a chosen gradient in index of refraction either bidirectionally (radially and longitudinally relative to an optical axis) or in three dimensions. The present invention further describes the design of several interesting optical devices by particular choices of the gradient in the index of refraction thereof. Such articles have numerous uses in the optics, optical fiber and solar technology industries for the purposes of designing compound lens systems using a single, integral lens, coupling light into fibers and for concentrating and directing light from a source having a significant angular variation to energy collecting and/or conversion devices such as a photovoltaic cell, to name but a few applications.