Agc Glass Europe

Florence Scheyvaerts

Thomas Lambricht

Audrey Dogimont

Aline Degand

Jean-Michel Depauw

Francois Closset

Laurent Dusoulier

Sebastien Caliaro

François Closset

The invention relates to a glass substrate for chemical strengthening where a surface is coated by magnetron sputtering with a temporary thin film that reduces the extent of ion exchange upon chemical strengthening and where the temporary thin film can be removed after the chemical strengthening by treatment with an etchant solution. Other embodiments relate to a method for making a chemically strengthened glass substrate with controlled curvature comprising: providing a substrate with opposed surfaces that are durable to a given etchant solution, forming a temporary thin film upon at least part of a surface of the glass substrate, chemically strengthening the glass substrate bearing the temporary thin film, and removing the temporary thin film after said chemical strengthening with said etchant solution. The thickness of the temporary thin film is chosen such that a controlled curvature is obtained upon chemical strengthening.

Glass substrate for chemical strengthening and method for chemically strengthening with controlled curvature

A float glass sheet having a boron- and lithium-free glass composition comprising the following in weight percentage, expressed with respect to the total weight of glass:  The glass sheet may be a chemically-temperable soda-silica type glass composition suitable for mass production that shows reduced or controlled increased warping effect.

Glass sheet capable of having controlled warping through chemical strengthening

The invention relates to a float glass sheet having a boron- and lithium-free glass composition comprising the following in weight percentage, expressed with respect to the total weight of glass: 65&#x2264;SiO&#x2264;78% 5&#x2264;NaO&#x2264;20% 0&#x2264;KO&#x3c;5% 1&#x2264;AlO&#x3c;6% 0&#x2264;CaO&#x3c;4.5% 4&#x2264;MgO&#x2264;12% a (MgO/(MgO+CaO)) ratio&#x2265;0.5 characterized in that the glass sheet has: (I). The invention corresponds to an easy chemically-temperable soda-silica type glass composition, which is more suited for mass production than aluminosilicate glass, and therefore is available at low cost, and with a base glass/matrix composition that is close to or very similar to compositions already used in existing mass production, and finally which shows reduced or controlled increased warping effect.

The invention relates to a spacer () to be sandwiched between first and second glass sheets () of a vacuum glazing panel, such as to maintain a first space between the glass sheets, which space forms a first cavity () under a vacuum of less than 1 mbar, a sealing joint () being positioned on the periphery of the glass sheets enclosing the first cavity. According to the invention, one such spacer () comprises cold-worked austenitic stainless steel.

Growing community of inventors

Brussels, Belgium

Florence Scheyvaerts