Method for making glass articles with defect-free surfaces

Details Method for making glass articles with defect-free surfaces Method for making glass articles with defect-free surfaces

1977-05-18

1978-07-25

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

With destruction or delamination of transitory attached or...

65 30E, 65 31, 156657, 156663, C03C 1900, C03C 2502

Patent

active

041026640

ABSTRACT:
This invention relates to a method for forming glass articles having essentially defect-free surfaces which can be equivalent in smoothness to that achieved in a polishing operation, and which can demonstrate mechanical strength superior to that exhibited by glass articles produced via conventional glass-forming techniques.The method contemplates melting two different glass compositions, one of which is highly soluble in a given solvent and the second of which is relatively insoluble in the same solvent; the molten glasses are simultaneously brought together while in the fluid state to form a laminated glass body wherein the insoluble glass is essentially completely enveloped within the soluble glass; the laminae are fused together at a temperature where the melts are in fluid form to provide an interface therebetween which is free from defects; the laminated article is cooled; and the soluble outer glass layer is dissolved away in an appropriate solvent. An exchange of ions takes place at the interface between the insoluble glass and the soluble outer glass layer.

REFERENCES:
patent: 3023139 (1962-02-01), van Tetterode
patent: 3771983 (1973-11-01), Straka
patent: 3791806 (1974-02-01), Koizumi et al.
patent: 3899314 (1975-08-01), Siegmund
patent: 3926601 (1975-12-01), Hicks
patent: 3989495 (1976-11-01), Siegmund

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