Treatment of surface of glass containing alkali metal

Abstract

Abstract PURPOSE:To prevent elution of alkali, by immersing a glass contg. an alkali metal in an aq. silica-saturated soln. of hexafluorosilicic acid contg. boric acid, and heating a silica film produced on the glass surface to form a fast silica film on the surface. CONSTITUTION:A glass contg. an alkali metal is immersed in a treating soln. made by adding boric acid to an aq. hexafluorosilicic acid saturated with silica to produce a silica film on the glass surface. This silica film is treated under heating resulting in forming a fast silica film. This reason is presumed that fluorine of the hexafluorosilicic acid reacts with the boric acid to be added, and the produced silica deposits on the glass surface, and treatment of it under heating causes dehydration reaction of OH groups contained to increase bonding of the silica. This process does not require a vacuum space, and it can easily treat a large size glass plate in a low cost equipment. It is superior to the vacuum evaporation or sputtering method in this point.

Inventors

• 👤 Shozaburo Nishikawa
• 👤 西河　正三郎
• 👤 Hirotsugu Nagayama
• 👤 永山　裕嗣

Bibliographic Details