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公开(公告)号:US06223563B1
公开(公告)日:2001-05-01
申请号:US09528382
申请日:2000-03-17
IPC分类号: C03B37016
CPC分类号: C03C1/006 , C03B19/12 , C03B37/016 , C03B2201/12 , C03C2201/06 , C03C2201/12 , Y10S65/16 , Y10S65/901 , Y10S501/90 , Y10S501/905
摘要: 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.
摘要翻译: 本发明反映了液相掺杂技术的发现,其与以前的技术不同,在随后的加热中表现出非常少的氟耗尽。 本发明涉及提供包含四烷基氢氧化铵和二 - ,三 - 或四烷基氟化铵,pH约为10至约14的溶胶的二氧化硅溶胶的步骤,向溶胶中加入胶凝剂以诱导凝胶化,浇铸或 挤出溶胶以形成凝胶体,然后干燥,热处理和烧结体。 有利地,含氟化合物是四甲基氟化铵。
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公开(公告)号:US06343490B1
公开(公告)日:2002-02-05
申请号:US09365191
申请日:1999-08-02
IPC分类号: C03B37016
CPC分类号: C01B33/1417 , C03C1/006
摘要: Silica sols exhibiting desirable yield-dilatancy are fabricated. A mixture comprising silica, water, and a pH-adjusting agent is provided, and the mixture is shear-mixed. The desirable properties of the resultant sol are attained by using a concentration of pH-adjusting agent that provides a viscosity within a particular range during shear mixing. The requisite pH range, however, changes depending on the properties of the silica mixture. A discovered technique for determining this changing pH range is by selecting the pH based on the silica surface area per unit volume of the mixture.
摘要翻译: 制造显示出期望的屈服扩张性的二氧化硅溶胶。 提供包含二氧化硅,水和pH调节剂的混合物,并将混合物剪切混合。 通过使用在剪切混合期间提供特定范围内的粘度的pH调节剂的浓度来获得所得溶胶的所需性质。 然而,所需的pH范围根据二氧化硅混合物的性质而变化。 用于确定该变化的pH范围的发现技术是通过基于混合物的每单位体积的二氧化硅表面积选择pH。
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