Glasses for cathode ray tube faceplates

Details Glasses for cathode ray tube faceplates Glasses for cathode ray tube faceplates

1991-02-13

1992-04-28

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

252478, 313480, C03C 3095, C03C 408

Patent

active

051089602

ABSTRACT:
A cathode ray tube faceplate glass that is essentially free from fluorine and the oxides of lead arsenic and zirconium, exhibits linear X-radiation absorption coefficients of at least 28 cm.sup.-1 at a wavelength of 0.6 Angstroms and at least 8.5 cm.sup.-1 at 0.3 Angstroms, undergoes essentially no "browning" discoloration when subjected to high velocity electrons, has a viscosity at the internal liquidus of at least 100,000 poises (10,000 Pa.s), has a coefficient of thermal expansion (25.degree.-300.degree. C.) in the range of 97-100.times.10-7/.degree. C., has an annealing point not lower than about 500.degree. C. and a strain point not lower than about 455.degree. C., has an electrical resistivity expressed in log R, that is greater than 9 at 250.degree. C. and greater than 7 at 350.degree. C., the glass consisting essentially, expressed in terms of weight percent as oxide basis, of

REFERENCES:
patent: 4015966 (1977-04-01), Weaver
patent: 4331770 (1982-05-01), Thompson
patent: 4337410 (1982-06-01), Van der Geer et al.
patent: 4376829 (1983-03-01), Daiku
patent: 4390637 (1983-06-01), Daiku
patent: 4734388 (1988-03-01), Cameron et al.
patent: 4830990 (1989-05-01), Connelly

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