Cuprous metaphosphate glasses

Details Cuprous metaphosphate glasses Cuprous metaphosphate glasses

1994-12-30

1996-06-25

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 46, 501 47, 501 48, 65 321, 651341, C03C 316, C03C 321, C03C 319, C03C 317

Patent

active

055299601

ABSTRACT:
The subject invention is directed at wherein either a portion of the ZnO or alkali metals, or both, found in prior art glasses, is replaced by Cu.sub.2 O, i.e., cuprous or monovalent copper. In addition to the Cu.sub.2 O substitution, the inventive glass contains a required metal oxide constituent which is necessary to enhance durability. More specifically, the present invention discloses a glass consisting essentially of, expressed in terms of mole percent on the oxide basis, of about 42-54% P.sub.2 O.sub.5, 10-30% Cu.sub.2 O, 10-30% R.sub. O and 3-12% of a component selected from the group consisting of 0-7% MoO.sub.3, 0-10 Fe.sub.2 O.sub.3, 0-10% Al.sub.2 O.sub.3 and 0-7%WO.sub.3. In addition, the composition includes up to a total of 45% of optional ingredients in the indicated proportions selected from the group consisting of 0-15% MgO, 0-20% CaO, 0-20% SrO, 0-20% BaO, 0-25% MgO+CaO+SrO+BaO, 0-35% ZnO, 0-10% MnO, 0-2% CeO.sub.2, 0-10% B.sub.2 O.sub.3, 0-2% Ln.sub.2 O.sub.3 , 0-8% F, the latter as analyzed in weight percent. The R.sub.2 O constituent is selected from the group consisting of 0-15% Li.sub.2 O, 0-20% Na.sub.2 O, and 0-10% K.sub.2 O. Furthermore, the Al.sub.2 O.sub.3 +Fe.sub.2 O.sub.3 does not exceed 10% and the MoO.sub.3 +WO.sub.3 does not exceed 7%. One final requirement of the glass is that the predominate proportion of the copper is present in the Cu.sup.+ or monovalent oxidation state.

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