Patent
Method for producing glass article resistant to discoloration with electron ray
Suzuki Koichi,Shibaoka Kazuo +1 more
TLDR
In this article, a soda-lime silica glass is made to contact with a molten salt containing potassium ion to substitute the sodium ion in the surface layer of the glass with potassium ion and the product is heat-treated.Abstract:
PURPOSE:To obtain a glass article resistant to discoloration with radiation of electron ray, by contacting soda-lime silica glass with a molten salt containing K to substitute the Na in the surface layer of the glass with K and heat-treating the product. CONSTITUTION:A soda-lime silica glass is made to contact with a molten salt containing potassium ion to substitute the sodium ion in the surface layer of the glass with potassium ion and the product is heat-treated. The surface layer extending from the surface to the intrusion depth of the radiated electron ray has a Na2O/(Na2O+K2O) molar ratio of 0.4-0.65. When the K -containing molten salt is potassium nitrate, the molten salt is maintained preferably at 440-480 deg.C and is made to contact with the glass for preferably 0.5-4hr. The heat-treatment is preferably carried out at 440-480 deg.C for 1-10hr.read more
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Patent
Glass article preventing coloring by electron beam
TL;DR: In this paper, a glass article used in a part receiving electron beam irradiation such as face plate of a cathode-ray tube, at least one kind of alkali metal oxide is added to the glass.
Patent
Base for optical recording medium and optical recording medium
TL;DR: In this paper, a disk-form transparent base for constituting an optical recording medium such as an optical-type information recording medium and an opto-magnetic recording medium is subjected to a low temperature type ion exchange treatment to set the ratio Na2O/K2O (wt%) in proximity to the surface of the base to 4X10 -1.