Making glass articles with defect-free surfaces

Details Making glass articles with defect-free surfaces Making glass articles with defect-free surfaces

C - Chemistry, Metallurgy

03

C

C03C 17/02 (2006.01) C03C 15/02 (2006.01)

Patent

CA 2061941

Abstract of the Disclosure The present invention is directed to a method for making a glass article having at least one surface which is essentially defect-free and is at least equivalent in smoothness to a polished surface. The method generally comprises the steps of: (a) bringing into contact with each other a body of a glass which is relatively insoluble in an acid solution and a body of a glass consisting essentially, expressed in terms of cation percent on the oxide basis, of 70-85% B2O3, 7-20% BaO, 0-10% PbO, 0-12% R2O, wherein R2O consists of Li2O+Na2O+K2O, 3-15% PbO+R2O, said glass from its setting point to room temperature having a linear coefficient of thermal expansion within about 5x10-7/°C of that of said relatively insoluble glass, a strain point within 10°C of the strain point, of said relatively insoluble glass, a liquidus temperature below that of said relatively insoluble glass, a viscosity at the forming temperature at least ten times that of said relatively insoluble glass, and being at least 100 times more soluble in an acid solution than said relatively insoluble glass, said contact being at a tempera- ture wherein at least said more soluble glass is in fluid form to produce a laminate having an interface between said glass bodies which is essentially free of defects; (b) cooling said laminate to solidify each glass present in fluid form; and thereafter (c) contacting said laminate with an acid solution to dissolve away said more soluble glass whereby the surface of said relatively insoluble glass from which said more soluble glass has been removed is rendered essentially defect-free and is at least equivalent in smoothness to a polished surface.

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