Sealing glass
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United States of America Patent
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-
May 20, 1986
Grant Date -
N/A
app pub date -
Nov 5, 1984
filing date -
Nov 5, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A crystallizable sealing glass composition in powered form that is a blend of a Pbo/ZnO/B.sub.2 O.sub.3 /SiO.sub.2 /BaO glass in the vitreous state and a small effective amount of finely divided zinc zirconium silicate as a nucleating agent. The zinc zirconium silicate has an average particle size of about 2 to 8 microns and is used alone, or in combination, with zirconium silicate having an average particle size of about 20 to 30 microns. The glass composition can be used to seal television picture tubes at 440.degree. C. or 460.degree. C. with excellent results, the early stages of crystallization showing large crystals and large glassy area, as well as DTA curve peaks at 15 to 25 minutes at 440.degree. C.
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