Funnel glass for cathode-ray tube
A funnel glass for a cathode ray tube contains, in mass percent, 48-62% SiO 2 , 1.4-4.1% Al 2 O 3 , 5-15% PbO, 0-2% MgO, 0.1-4% CaO, 3-8% SrO, 3-8% BaO, 0-2% ZnO, 4-9% Na 2 O, 4-9% K 2 O 0.3-2% ZrO 2 , 0-1% TiO 2 , 0-1% CeO 2 , 0-2% Sb 2 O 3 , and 0.03-1 % Fe 2 O 3 . The value of (SrO+BaO)/PbO is wi...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A funnel glass for a cathode ray tube contains, in mass percent, 48-62% SiO
2
, 1.4-4.1% Al
2
O
3
, 5-15% PbO, 0-2% MgO, 0.1-4% CaO, 3-8% SrO, 3-8% BaO, 0-2% ZnO, 4-9% Na
2
O, 4-9% K
2
O 0.3-2% ZrO
2
, 0-1% TiO
2
, 0-1% CeO
2
, 0-2% Sb
2
O
3
, and 0.03-1 % Fe
2
O
3
. The value of (SrO+BaO)/PbO is within the range of 1.0-3.2. The value of Al
2
O
3
/PbO is within the range of 0.13-0.4. The funnel glass has an X-ray absorption coefficient of 40 cm
−1
or more at 0.6 . |
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