17-01-2013 дата публикации
Номер: US20130017387A1
Принадлежит:
Disclosed are a phase separable glass compositions used to produce chemically durable porous glass, e.g., porous glass powder, and the application of a sol gel coating to the glass to enhance chemical durability of the glass in alkaline solutions, and to the use of the glass, e.g., glass powder, as substrates for separation technology where harsh alkaline environments (pH≧12 e.g., pH 12-14) are routinely prevalent. 1. A porous , alkaline resistant , sodium borosilicate glass comprising on an oxide basis{'sub': 2', '2', '3', '2, 'A. SiO, BOand NaO forming a glass composition,'}{'sub': 2', '2', '2', '3, 'B. ZrO, TiO, AlO, CaO and/or ZnO as an additive to the glass composition, and'}{'sub': 2', '2', '2', '2', '2', '7', '2', '2', '7', '2', '2', '7', '2', '2', '7', '2', '7', '2', '7, 'C. a ZrOand/or TiOand/or CeOand/or LaZrOand/or CeZrOand/or LaTiOand/or GdTiOand/or CeZrTiOand/or GdZrTiObased sol gel coating on the glass, which glass has undergone phase separation to form a boron-rich soluble phase and a silica-rich insoluble phase, and the boron-rich soluble phase has been substantially removed prior to the application of the sol gel coating.'}2. A glass according to claim 1 , wherein the starting composition by weight comprises{'sub': 2', '2', '3', '2, '40-80% SiO, 5-35% BOand 1-10% NaO, and'}{'sub': 2', '2', '2', '3, '0 to 12% of ZrO, 0 to 10% of TiO, 0 to 10% AlO, 0 to 10% CaO, and/or 0 to 10% ZnO as an additive in the glass,'}wherein the glass contains at least one of said additives.3. A glass according to claim 1 , which is in the form of a powder.4. A glass according to claim 1 , which has a ZrObased sol gel coating.5. A glass according to claim 1 , which has a TiObased sol gel coating.6. A process of preparing a glass according to claim 1 , comprising:{'sub': 2', '2', '2', '2', '2', '7', '2', '2', '7, 'applying a ZrOand/or TiOand/or CeOand/or LaZrOand/or CeZrOand/or'}{'sub': 2', '2', '7', '2', '2', '7', '2', '7', '7, 'LaTiOand/or GdTiOand/or CeZrTiOand/or ...
Подробнее