Abstract:
The present invention is directed to a method for making fused silica glass by introducing a liquid, preferably halide-free, silicon-containing compound (32) directly into the flame (23) of a burner (24), thereby forming amorphous soot (25). This soot is deposited on a surface (26) and consolidated into a body of fused silica glass. The invention also relates to an apparatus which includes a burner (24) which generates a flame (23); an injector (31) for supplying a compound (32) to the flame (23) to convert the compound to soot and a surface (26) on which the soot is deposited.
Abstract:
On décrit un procédé permettant de fabriquer un objet de silice synthétique par l'oxydation en phase vapeur d'un matériau précurseur de silice dans une flamme, 60 % ou plus du dioxyde de silicium dans le produit déposé étant dérivé par oxydation de (A) un ou plusieurs composés de dioxyde de silicium volatile à chaîne linéaire ayant la formule générale: R3Si.O(SiR2O)n.SiR3 et/ou (B) un ou plusieurs composés de dioxyde de silicium volatils cycliques ayant la formule générale: SinOn(R)2n. On décrit également des poudres de fumées (2) dopées ou non dopées, des suies de silice poreuse ou des corps complètement densifiés obtenus grâce audit procédé.
Abstract:
A process for the production of a glass or ceramic article comprising a vapour phase oxidation wherein vaporized compounds are oxidized to form particulate oxide soot which is captured and consolidated to a unitary article by sintering, characterised in that at least one of the compounds is a β-diketonate complex of a metal selected from Groups IA, IB, IIA, IIB, IIIA, IIIB, IVA, IVB and the rare earth series of the Periodic Table is disclosed. A process for the production of a glass optical waveguide comprising a vapour phase oxidation wherein compounds of selected metals are vaporized, the vapours are transported to an oxidation site, the vapours are oxidized at the site to form particulate metal oxide soot, the soot is captured and consolidated into clear glass and the glass is drawn into optical waveguide fibre, characterised in that at least one of the compounds is a β-diketonate complex of a metal selected from Groups lA, IB, IIA, IIB, IIIA, IIIB, IVA, IVB and the rare earth series of the Periodic Table is also disclosed. The present invention offers advantages over the prior art.
Abstract:
An abrasion, scratch, mar and solvent resistant glass coated non-opaque shaped polycarbonate article comprising a polycarbonate substrate having deposited on the surface thereof (i) an intermediate primer layer containing the photoreaction products of certain polyfunctional acrylic monomers; and (ii) a top layer of vapor deposited glass.
Abstract:
The present invention provides an optical fiber providing high photosensitivity in the absence of hydrogen loading as well as a low numerical aperture. One aspect of the present invention relates to an optical fiber including a core, the core comprising silica doped with at least about 6 mol% germania and at least about 0.9 wt% fluorine; and a cladding surrounding the core. The optical fiber of the present invention is suitable for the production of fiber Bragg gratings.
Abstract:
The invention reflects discovery of a liquid phase doping technique that, unlike previous techniques, exhibits very little fluorine depletion upon subsequent heating. The invention involves the steps of providing a silica sol comprising a tetraalkylammonium hydroxide and a di-, tri-, or tetraalkylammonium fluoride, the sol having pH of about 10 to about 14, adding a gelling agent to the sol to induce gelation, casting or extruding the sol to form a gel body, and then drying, heat treating, and sintering the body. Advantageously, the fluorine-containing compound is tetramethylammonium fluoride.
Abstract:
PURPOSE: To provide a new method for producing fluorodopant-injected silica glass. CONSTITUTION: This method for producing the product, comprises a step for preparing a silica sol which comprises a tetraalkylammonium hydroxide and a di-, tri- or tetra-alkyl ammonium fluoride and has a pH value of about 10 to about 14, a step for adding a gelling agent to the sol to gel the sol, a step for casting or extruding the gel to form a gel-like article, and a step for drying, thermally treating and calcining the gel-like article. The fluorine-containing compound is preferably tetramethylammonium fluoride. The product obtained by the liquid phase doping method scarcely loses the fluorine, even when the product is subjected to a subsequent heating treatment.
Abstract:
불꽃 중에서의 실리카 전구 물질의 기상 산화에 의한 합성 실리카 제품 제조 방법은 (A) 일반식 R 3 SiO(SiR 2 O) n SiR 3 로 표시되는 1종 또는 그 이상의 직쇄 휘발성 실리콘 화합물 및/또는 (B)일반식 Si n O n (R) 2n 으로 표시되는 1종 또는 그 이상의 환식 휘발성 실리콘 화합물의 산화로 이루어지고 증착무룽의 실리카는 60% 이상으로 되 전기한 방법에 의하여 제조된 혼이 또는 비혼입 연무 분말, 다공성 실리카 매연 또는 밀집체로 청구 되었음.