Lead silicate glasses

Details Lead silicate glasses Lead silicate glasses

1991-10-24

1993-03-09

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 62, 313480, C03C 3105

Patent

active

051927187

ABSTRACT:
A family of lead silicate glasses particularly adapted to drawing of tubing for use in the neck section of a cathode ray tube. The glasses have internal liquidi below 750.degree. C., electrical resistivities over 8.0 ohm-cm (Log R.sub.350.degree. C.) and linear x-ray absorption values of at least 95 cm.sup.-1 at a wavelength of 0.6 Angstrom units. Their compositions consist essentially of, in weight percent as calculated on an oxide basis, 46-51% SiO.sub.2, 0.5-2% Al.sub.2 O.sub.3, 0.3-3% Na.sub.2 O, 9-13% K.sub.2 O, 2.5-6% SrO, 1-4% BaO, 30-33% PbO, 0-2% ZnO and 0.3-1% Sb.sub.2 O.sub.3.

REFERENCES:
patent: 2009793 (1935-07-01), Sanchez-Vello
patent: 2692833 (1954-10-01), Armistead
patent: 3464932 (1969-09-01), Connelly et al.
patent: 4174490 (1979-11-01), Van Erk et al.
patent: 4520115 (1985-05-01), Speit et al.
patent: 4677081 (1987-06-01), Thomas et al.

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