Process for producing an optical fluorophosphate glass having an

Details Process for producing an optical fluorophosphate glass having an Process for producing an optical fluorophosphate glass having an

1989-07-05

1990-07-17

Bell, Mark L.

Glass manufacturing

Processes

Forming product or preform from molten glass

501 44, 501902, 65 72, 65136, C03C 3247, C03C 400, C03B 518

Patent

active

049419072

ABSTRACT:
Optical fluorophosphate glass which is based on Mg(PO.sub.3).sub.2, Ca(PO.sub.3).sub.2, Ba(PO.sub.3).sub.2, Al(PO.sub.3).sub.3, MgF.sub.2, CaF.sub.2, SrF.sub.2, AlF.sub.3, BaO and SrO and has a refractive index n.sub.e between 1.515 and 1.546, an Abbe value .nu..sub.e between 75.8 and 77.4 and a positive anomalous partial dispersion value .DELTA..nu..sub.e between 14.85 and 15.15.
The glass comprises (in weight-%) 2.4-2.7 Mg; 4.5-4.9 Ca; 15.9-17.6 Sr; 20.2-22.3 Ba; 5.6-6.2 Al; 8.8-9.7 P; 22.0-24.3 F and 15.7-17.4 O. The improved physico-chemical parameters, such as linear expansion coefficient, glass transition temperature T.sub.g, density .zeta., Knoop-hardness HK, etc., are stated. Finally, a production process for this optical glass is described.

REFERENCES:
patent: 3492136 (1970-01-01), Bromer et al.
patent: 3508937 (1970-04-01), Bromer et al.
patent: 3671276 (1972-06-01), Bromer et al.
patent: 3847624 (1974-11-01), Bromer et al.
patent: 4040846 (1977-08-01), Broemer et al.
patent: 4213788 (1980-07-01), Kamiyama
patent: 4225459 (1980-09-01), Faulstich et al.
patent: 4386163 (1983-05-01), Kodara
Chemical Abstracts, vol. 103, No. 10, Abstract No. 75254q.

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