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.
Abstract:
Fahrzeug-Verbundglas zur Abtrennung eines Fahrzeuginnenraums von einer äußeren Umgebung, mindestens umfassend: -eine Innenscheibe (1) aus Glas mit einer Dicke von kleiner oder gleich 0,4 mm, -eine Außenscheibe (2) aus Glas mit einer Dicke von größer oder gleich 1,5 mm und -eine akustisch dämpfende Zwischenschicht(3), welche die Innenscheibe (1) mit der Außenscheibe (2) verbindet, wobei -die akustisch dämpfende Zwischenschicht (3) mindestens zwei äußere polymere Schichten (3.1) und eine zwischen diesen liegende innere polymere Schicht (3.2) umfasst und die äußerenpolymeren Schichten (3.1) eine niedrigere Elastizität oder Plastizität als die innere polymere Schicht (3.2) aufweisen, -die innere polymere Schicht (3.2) eine Dicke von 0,05 mm bis 0,40 mm aufweist, -die äußeren polymeren Schichten (3.1) eine Dicke von 0,20 mm bis 0,60 mm aufweisen und -die Gesamtdicke der akustisch dämpfenden Zwischenschicht (3) mindestens 0,70 mm beträgt.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung von dotiertem Quarzglas, das aus Quarzsand oder Bergkristall zusammen mit Zusatzstoffen erschmolzen wird, wobei als Zusatzstoff zumindest Neodymaluminat (NdAlO 3 ) zugesetzt wird.
Abstract:
Deuterium oxide, D2O, also called heavy water, is used for the hydrolysis of silanes and metal compounds. The D2O-hydrolyzed silanes polycondense much easier than H2O-hydrolyzed silanes, resulting in a fast Si-O-Si network build up. The most important feature of using D2O is that the final materials are 100 % free of O-H and the residual O-D bond does not have an absorption peak in the wavelength range of 1.0 to 1.8 mu m, which is crucial in reducing optical loss at the wavelengths of 1.3 and especially 1.55 mu m. O-H free sol-gel materials with low optical loss have been developed based on this process. D2O may be applied in all kinds of hydrolysis-processes, such as the sol-gel process of silanes and metal compounds, the synthesis of polysiloxane, and may be extended to other silica and metal-oxides deposition processes for example, flame hydrolysis deposition (FHD) whenever water is used or O-H bond involved. The concept of replacing O-H bond with O-D bond is applicable to any O-H bond containing materials used in optical based telecommunication.
Abstract:
An improved sol-gel process is disclosed for producing a synthetic silica glass article, in which a sol is formed having a silica loading as high as 34 to 40 %. This high loading is achieved by introducing an aqueous colloidal silica suspension into a silicon alkoxide solution and slowly stirring the mixture together, during which time the mixture hydrolyzes and the colloidal suspension is broken down by chemical reaction. This produces a hydrolyzed sol incorporating a suspension of very fine aggregates of colloidal particles, having particle sizes less than about 10 microns. The need for a stabilizing agent and/or continuous ultra-sonicating or violently stirring the sol is eliminated. One application of the process of the invention is in making silica photoblanks exhibiting very high optical transmission at UV wavelengths. For such applications, the silica powder is purified using a chlorination step prior to its being made into the aqueous colloidal silica suspension. In addition, warpage of the silica photoblanks is avoided by using silicon carbide plates as weights during sintering.