Glass plate and process for production thereof

Abstract

Disclosed are: a glass plate in which the elution of Na+ to the surface is suppressed and which is inexpensive; and a process for producing the glass plate. The glass plate comprises a soda lime silica glass containing at least elements Si, Al, Ca and Na, wherein the amounts of Na at the depth of 20 nm, 40 nm and 60 nm from at least one surface of the glass plate are 45% or less, 70% or less and 80% or less, respectively, wherein the amount of Na at the depot of 2000 nm from the surface is 100%.

Description

technical field [0001] The present invention relates to Na + Glass plate in which elution to the surface is suppressed, and method for producing the same. Background technique [0002] Glass panels for construction, glass panels for vehicles (window glass for automobiles, etc.), glass panels for solar cells (cover glass, glass substrates for thin-film solar cells), glass substrates for solar thermal power concentrator mirrors, etc., are versatile and easy to manufacture. Therefore, soda lime glass containing elements such as Si, Al, Na, Ca, etc. is used. [0003] However, in a glass plate made of Na-containing soda-lime glass, Na + Since it is easily eluted to the surface, the following problems arise. [0004] (1) The anti-reflection film provided on the surface of the glass plate is separated from the Na eluted to the surface of the glass plate over time. + reaction, and the anti-reflection film was peeled off from the glass plate. [0005] (2) The transparent conduct...

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Problems solved by technology

[0005] (2) The transparent conductive film provided on the surface of a glass substrate for a thin-film solar cell, etc., interacts with Na eluted to the surface of the glass plate over time. + reaction, thereby deteriorating the transparent conductive film

However, the raw materials used for alkali-free glass are not easy to melt, and the manufacturing process is complicated, so it is not suitable for various building glass plates, automotive glass plates, solar cell glass plates, etc.

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