Method for removing a surface layer from a metal fluoride glass

Details Method for removing a surface layer from a metal fluoride glass Method for removing a surface layer from a metal fluoride glass

1986-03-12

1986-12-23

Schor, Kenneth M.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

65 31, 65DIG16, C03C 1500

Patent

active

046311149

ABSTRACT:
A method for removing a surface layer from a metal fluoride glass containing barium ions, particularly glass rods of the type used for manufacturing fibers for optical communications technology. A rapid, uniform and turbidity-free erosion of a disturbed outside layer of the starting glass is accomplished with an etchant solution in which a fluoride complexing agent or a barium complexing agent is dissolved. In particular, a rapid dissolving of a barium fluoro-zirconate glass is achievable with an etchant solution containing acidic Zr (IV) salts, whereby the risk of contaminating the so etched surface by the etchant solution does not exist.

REFERENCES:
patent: 3446682 (1969-05-01), Wawner
patent: 3930870 (1976-01-01), Basi
patent: 4049413 (1977-09-01), French
patent: 4445755 (1984-05-01), Ohsawa et al.
Marcel Poulain: Halide Glasses, J. Non-Crystalline Solids 56, (1983), 1-14, North Holland Publishing Company.
Proc. 8th Europe Conf. Opt. Comm.; Cannes, 1982, S81-83.
Communications of the American Ceramic Society 67, (1984), C-238 through C-239.
The Chemical Behavior of Zirconium, Van Nostrand, Princeton, 1958, S. 143.

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