The present invention relates to transparent quartz glass of high purity produced by molding powdery amorphous silica, and sintering and fusing the molded article of amorphous silica. Particularly, the present invention relates to pure transparent quartz glass which contains less impurities like alkalis respectively at a content of not more than 1 ppm, contains less water, and has high heat resistance, thereby being useful for a photomask and other uses in semiconductor production. Conventionally, transparent quartz glass is produced by a process of melting powdery quartz crystal in vacuo in a furnace, a process of melting powdery quartz crystal by oxyhydrogen flame, or a like process. However, the conventional processes employ powdered natural quartz crystal, whereby the resulting quartz glass is not satisfactory to meet the severe requirements for high purity for highly integrated LSI, even though the quartz glass has high heat resistance. Although the powdered natural quartz crystal is treated for high purity, not all of the undesired impurities can be removed to respective contents of not higher than 1 ppm at the moment.
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- US5665133A - Process for production of pure transparent quartz - Google Patents
- US7841211B2 - Production process of synthetic quartz glass - Google Patents
- Explore all $506 billion in goods that the US imported from China in 2017
- CROSS-REFERENCE TO RELATED APPLICATIONS
- WO2000024685A1 - Synthetic quartz glass and method for production thereof - Google Patents
- Current tariff classification
- US6920766B2 - Apparatus for producing synthetic quartz glass - Google Patents
US5665133A - Process for production of pure transparent quartz - Google PatentsVIDEO ON THE TOPIC: Make a quartz glass test tube.
Account Options Anmelden. Meine Mediathek Hilfe Erweiterte Buchsuche. CRC Press Amazon. Glasses for Infrared Optics. Valentina F. This book explores oxygen-free chalcogenide glasses, the only commercial transparent vitreous materials used for long-wave infrared radiation. The chalcogenides have been the subject of study around the world for many years, and continue to be an important area of research and development in infrared optics.
Written by a renowned glass specialist with extensive experience working with chalcogenide glasses, Glasses for Infrared Optics includes discussions of: Chalcogenide glasses - a unique class of vitreous substances Optical properties of chalcogenide glasses Elaboration of commercial glasses Technological basics for manufacturing optical chalcogenide glasses The material presented in Glasses for Infrared Optics is based on research performed at the Vavilov State Optical Institute in Russia.
This is the first and only work that reviews every aspect of chalcogenide glasses. The scope of this comprehensive book is unique, and the major portion of this work has never been published before in English. Inhalt Chapter. Properties and Quality of Chalcogenide Glasses Manufactured. Encyclopedia of applied physics American Institute of Physics Auszug - Bibliografische Informationen. Glasses for Infrared Optics Valentina F. Kokorina CRC Press , Chapter 2.
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US7841211B2 - Production process of synthetic quartz glass - Google Patents
Method for producing a quartz glass crucible having a roughened inner surface region for pulling single crystal silicon. Patent number: Abstract: The present invention is a method for producing a quartz glass crucible for pulling a single crystal silicon from a silicon melt held therein, including the steps of: producing a quartz glass crucible having an outer layer including an opaque quartz glass containing bubbles therein and an inner layer including a transparent quartz glass containing substantially no bubbles; roughening a region of an inner surface of the produced quartz glass crucible, the region being in contact with the silicon melt when holding the silicon melt; and heating the quartz glass crucible having the roughened inner surface to crystallize a surface of the roughened region. This can produce a quartz glass crucible for pulling a single crystal silicon which can suppress generation of a brown ring on the inner surface of the crucible during pulling the single crystal silicon and can suppress crystallinity disorder of the single crystal silicon. Type: Grant. Filed: June 1,
Explore all $506 billion in goods that the US imported from China in 2017
Unless otherwise indicated general rate applies for CA. Open in a new tab Open in this tab. Page Image. Section XIII - Articles of stone, plaster, cement, asbestos, mica or similar materials, ceramic products, glass and glassware Chapter 70 - Glass and glassware.SEE VIDEO BY TOPIC: GT Advanced - Sapphire Glass Production
Account Options Anmelden. Meine Mediathek Hilfe Erweiterte Buchsuche. Importing Into the United States. Inhalt operation ports of entry. Beliebte Passagen Seite 13 - States, in the ordinary course of trade and in the usual wholesale quantities in such market, or the price that the manufacturer, producer, or owner would have received or was willing to receive for such merchandise when sold in the ordinary course of trade and in the usual wholesale quantities, at the time of exportation of the imported article. Seite 63 - Act, be brought into a zone and may be stored, sold, exhibited, broken up, repacked, assembled, distributed, sorted, graded, cleaned, mixed with foreign or domestic merchandise, or otherwise manipulated Seite 42 - If an imported article will be used in manufacture, the manufacturer is the "ultimate purchaser. Seite 60 - Milk and cream, not concentrated nor containing added sugar or other sweetening matter: -Of a fat content, by weight, not exceeding Seite 61 - Italian-type cheeses, made from cow's milk, in original loaves Romano made from cow's milk, Reggiano, Parmesano, Provoloni, Provolette, and Sbrinz
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WO2000024685A1 - Synthetic quartz glass and method for production thereof - Google Patents
The present invention relates to a method of manufacturing a silica powder by a sol-gel method, wherein A suspension in water of a first material based on silica, gelled suspension, the gel is dried obtained and fractionated the dry gel into a powder comprised of silica granules. It also relates to the use of such a powder for producing an optical fiber preform. A silica powder manufacturing process is known in particular from French patent FR-B The suspension is conducted as exemplified in said patent, substantially free from chlorine particles. Indeed, the production of silica particles is performed by oxidation, generally in the presence of hydrogen and oxygen, silicon chloride SiCl 4.
Current tariff classification
Account Options Anmelden. Meine Mediathek Hilfe Erweiterte Buchsuche. CRC Press Amazon. Glasses for Infrared Optics. Valentina F. This book explores oxygen-free chalcogenide glasses, the only commercial transparent vitreous materials used for long-wave infrared radiation.
US6920766B2 - Apparatus for producing synthetic quartz glass - Google Patents
The use of hazardous or toxic waste to make a glass material a useful product is provided for herein, however, vitrification of hazardous waste for purposes of containment is excluded, see References to Other Classes below. Included within the scope of the class definition are:. Search notes relating to a processes and apparatus and b products will be identified appropriately. Although silicon and silicon dioxide are arbitrarily considered to be glass materials for Class 65, a process of growing these polycrystalline materials is proper for Class 23, even though a rod is used as a bait, unless the shape formed is not a result of crystallization or deposition on the rod.
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This application claims the benefits of U. The present invention relates to a glass composition and products made thereof, having very little variation in key properties within any given lot of the glass composition.
The present invention relates to a high-purity, opaque quartz glass having an excellent capability of intercepting heat rays, and a method for producing such a high-purity, opaque quartz glass. Further, it relates to a flange and a tube made of such a high-purity, opaque quartz glass, and methods for producing them. Because of high capability of intercepting heat rays, an opaque quartz glass has been widely used hitherto for furnace tubes and flanges for use in the production of semiconductors, etc.