摘要:
Es wird ein Verfahren angegeben, das die wirtschaftliche Herstellung von dotiertem Quarzglas ermöglicht, insbesondere von laseraktivem Quarzglas, das hinsichtlich der Homogenität der Dotierstoffverteilung verbessert ist, indem eine Suspension bereitgestellt wird, die SiO 2 -Teilchen sowie eine Ausgangsverbindung für mindestens einen Dotierstoff in einer wässrigen Flüssigkeit enthält, die Flüssigkeit unter Bildung eines dotierten Zwischenprodukts, das Teilchen des Dotierstoffs oder Teilchen einer Vorläufersubstanz des Dotierstoffs enthält, entfernt wird, und aus dem dotierten Zwischenprodukt durch Sintern das dotierte Quarzglas gebildet wird, wobei mindestens ein Teil der Teilchen des Dotierstoffs oder der Teilchen der Vorläufersubstanz desselben in der Suspension als Präzipitat einer pH-Wertgesteuerten Fällungsreaktion der Ausgangsverbindung erzeugt wird.
摘要:
Silica glass granule having the following features: Area: 100 to 5000 μm 2 , ECD: 5 to 100 μm, Circumference: 20 to 400 μm, Maximum diameter: 10 to 140 μm, Minimum diameter: 5 to 80 μm, where all values are medium values, Specific BET surface area: 2 /g Impurities: 800 μm, c) the slug fragments having a tamped density of 300 to 600 g/1, and d) subsequently treating them at 600 to 1100°C in an atmosphere which comprises one or more compounds which are suitable for removing hydroxyl groups, and e) then sintering them at 1200°C to 1400°C.
摘要:
The invention starts from a known component of quartz glass for use in semiconductor manufacture, which component at least in a near-surface region shows a co-doping of a first dopant and of a second oxidic dopant, said second dopant containing one or more rare-earth metals in a concentration of 0.1-3% by wt. each (based on the total mass of SiO 2 and dopant). Starting from this, to provide a quartz glass component for use in semiconductor manufacture in an environment with etching action, which component is distinguished by both high purity and high resistance to dry etching and avoids known drawbacks caused by co-doping with aluminum oxide, it is suggested according to the invention that the first dopant should be nitrogen and that the mean content of metastable hydroxyl groups of the quartz glass is less than 30 wtppm.
摘要:
Heat insulating panels are widely used in various domains, for example construction sites or hospitals. These panels require adhesives which may generate heat when the panels are subjected to high temperatures. In the field of high temperature insulation, ceramics are brittle and may not be suitable in some applications. This invention discloses a heat-insulating composite including a plurality of glass, and a binder composition for fusing the glass when the heat-insulting composite is exposed to a temperature higher than 1000C. It was found that as the heat progresses from the outer surface to the inner surface of the composite, plurality of laminated ceramic-like structures are formed, which may assist further in insulating the heat. Interestingly, these laminated ceramic-like structures are found to be rubber-like and therefore not brittle.
摘要:
A method for producing ultra-high purity, optical quality, glass articles is disclosed which involves: 1. compacting metaloxide or metal loidoxide to granules having a mean particle size of less than about 1 millimeter; 2. optionally fully sintering the granules to produce high purity, artificial sand; 3. casting the granulesar artificial sand by conventional techniques, such as, slip casting, to form a high density, porous, green body; 4. optionally drying and partially sintering the green body; 5. optionally fully sintering the green body under vacuum,- and 6. optionally hot isostatic pressing the fully sintered green body whereby the metal oxide or metalloid oxides is a pyrogenic silicon dioxide powder with a BET surface area of 30 to 90 m2/g, a DBP index of 80 or less, a mean aggregate area of less than 25000 nm2 and a mean aggregate circumference of less than 1000 nm, wherein at least 70% of the aggregates have a circumference of less than 1300 nm or a high-purity pyrogenically prepared silicon dioxide having metal contents of less than 0.2 µg/g.
摘要:
A luminescent element of next-generation optical device that by photoluminescence (PL), exhibits a large half-value width of emission spectrum in the wavelength region of visible light so as to realize broad light emitting characteristics and enables white light emission. Silica glass is produced through a firing operation for firing a product of pressure molding of silica microparticles such as fumed silica, wherein the firing temperature is regulated within a range not exceeding 1000°C so as to satisfactorily carry out dehydration condensation reaction with respect to OH groups of silica microparticles to thereby attain clearing and wherein amorphous defects having occurred during the reaction are retained without being reduced. This silica glass is used as a phosphor.
摘要:
Glasses and glass-ceramics comprising at least 75 percent by weight Al2O3, based on the total weight of the glass or glass-ceramic, respectively, and at least one metal oxide other than Al2O3. Glasses and glass-ceramics according to the present invention can be made, formed as, or converted into glass beads, articles (e.g., plates), fibers, particles, and thin coatings. Embodiments of glass-ceramic particles according to the present invention can be are particularly useful as abrasive particles.
摘要翻译:玻璃和玻璃陶瓷分别包含至少75重量%的Al 2 O 3,基于玻璃或玻璃陶瓷的总重量,以及至少一种除Al 2 O 3之外的金属氧化物。 根据本发明的玻璃和玻璃陶瓷可以制成,形成或转化成玻璃珠,制品(例如板),纤维,颗粒和薄涂层。 根据本发明的玻璃 - 陶瓷颗粒的实施方案可以特别用作磨料颗粒。
摘要:
In one aspect, a method is provided for molding from glass complex optical components such as lenses, microlens, arrays of microlenses, and gratings or surface-relief diffusers having fine or hyperfine microstructures suitable for optical or electro-optical applications. Thereby, molds are used, which define the profile of the optical components, made on metal alloys, particularly titanium or nickel alloys, or refractory compositions, with or without a non-reactive coating are provided. Given that molding optical components from oxide glasses has numerous drawbacks, it has been discovered in accordance with the invention that non-oxide glasses substantially eliminates these drawbacks. The non-oxide glasses, such as chalcogenide, chalcohalide, and halide glasses, may be used in the mold either in bulk, planar, or power forms. In the mold, the glass is heated to about 10-110°C, preferably about 50°C, above its transition temperature (Tg), at which temperature the glass has a viscosity that permits it to flow and conform exactly to the pattern of the mold.