CRT frit capable of sealing a CRT bulb at a relatively low temperature and in a short time
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United States of America Patent
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Jun 24, 2003
Grant Date -
N/A
app pub date -
Feb 11, 2000
filing date -
Feb 19, 1999
priority date (Note) -
Expired
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Abstract
A CRT frit for use in sealing a panel and a funnel of a CRT bulb comprises non-crystallizing glass powder and refractory filler powder. The non-crystallizing glass powder consists essentially of, by weight percent, 75-90% PbO, 7-20% B.sub.2 O.sub.3, 0-8% ZnO, 0-5% SiO.sub.2, and 0.1-8% Al.sub.2 O.sub.3 +Fe.sub.3 O.sub.3. The mixing ratio of the non-crystallizing glass powder and the refractory filler powder is within a range between 95:5 and 55:45 in weight ratio. The coefficient of thermal expansion at a temperature between 30 and 250.degree. C. is within a range between 80 and 90.times.10.sup.-7 /.degree. C.
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