Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1992-02-28
1993-10-26
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
65DIG16, C03C 3112
Patent
active
052566056
ABSTRACT:
Suitable starting materials for the manufacture of a heavy metal fluoride glass composition are mixed with solid xenon fluoride as the fluoridizing reagent, after which the mixture is heated to temperatures between 200.degree. and 400.degree. C. in an inert atmosphere for a time which suffices to bring about fluoridation of the starting materials. The intermediate product thus obtained is melted thereby forming a stable glass composition of a high purity and a high transparency. The method can be carried out in a simple manner in a furnace which need not be gastight.
REFERENCES:
patent: 3650779 (1972-03-01), Riebling et al.
"Reaction of NF3 and SF6 with Some Oxides Connected with Heavy-Metal Flouride Glass Processing" M. M. Broer et al, J. Mater. Res. 3(4) pp. 755-760 (1988).
"The Reaction of Fluoroxidizers with Rare Earth Elements, Zirconium and Hafnium Oxides" M. N. Brechovskich et al., Mat. Res. Bull 23 (10) pp. 1417-1421, 1989.
"Preparation of High-Purity Fluorozirconate Glasses" G. G. Devyatykh et al. Z. Anorg. Allg. Chem. 576 pp. 25-32 (1989).
"Chemistry of Fluoride Glasses" M. Poulain et al., Chemtronics 3 (Jun.) pp. 77-85 (1988).
Oomen Emmanuel W. J. L.
Van Dongen Anne-Marie A.
Veenvliet Hendrik
Bell Mark L.
Botjer William L.
U.S. Philips Corp.
Wright A.
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