| 摘要 |
822,868. Eliminating water from porous 96% silica glass. CORNING GLASS WORKS. Nov. 18, 1957 7 [Nov. 19, 1956], No. 35851/57. Drawings to Specification. Class 56. Water is eliminated from porous 96% silica glass articles by displacing OH radicals by permeating the article with a fluid comprising fluorine-containing material and heating the article. The fluorine-containing material is perferably a fluoride e.g. HF, NI-I4F, NH 4 HF, CH 3 F, CHF 3 , C 2 H 5 F, CCl 2 F 2 , C 6 H 5 F, SiF 4 , (NH 4 ) 2 SiF 6 , BF 3 , AlF 3 . The final heating is preferably carried out in the absence of substantial ambient moisture i.e. in anhydrous air or in vacuo. Specification 622,530 is referred to.
|
