Leadless silicate glass composition and pipe cone glass for cathode ray tube

A technology of lead silicate glass and cathode ray tube, which is applied in the field of lead-free silicate glass composition and cone glass for cathode ray tube, and can solve the problems of lead pollution and reduction of PbO weight content, etc.

Inactive Publication Date: 2006-06-14
HENAN ANCAI HI-TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese Patent No. 200410073033.5 provides a recipe for cone glass for a color picture tube glass bulb with a reduced weight content of PbO, but the weight content of PbO is still between 15% and 21%
However, these measures cannot fundamentally solve the potential lead pollution problem, and further research on lead-free CRT tube cone glass is required

Method used

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  • Leadless silicate glass composition and pipe cone glass for cathode ray tube
  • Leadless silicate glass composition and pipe cone glass for cathode ray tube
  • Leadless silicate glass composition and pipe cone glass for cathode ray tube

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Embodiment Construction

[0078] Traditional CRT tube cone glass generally uses lead silicate glass system containing alkali metal oxides and alkaline earth metal oxides. The main X-ray absorber is PbO, sometimes supplemented with SrO and BaO as X-ray absorbers, but the content is relatively high Small. The research on lead-free CRT cone glass is not just a simple substitute for lead, but must be considered comprehensively from the aspects of glass formation and glass properties.

[0079] To replace PbO in the CRT funnel glass, the X-ray absorption properties of the glass must be considered first, and SrO and BaO alone cannot meet the X-ray absorption requirements of the CRT funnel glass. Among the candidate oxides to replace PbO, Bi 2 o 3 Has an X-ray mass absorption coefficient similar to PbO; heavy metal oxides of the same period and adjacent elements as Sr, such as ZrO 2 , Y 2 o 3 , Nb 2 o 5 、MoO 3 , and the heavy metal oxide Ta 2 o 5 and WO 3 , The X-ray mass absorption coefficient at 0...

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Abstract

The present invention provides a leadless silicate glass composition and leadless funnel neck glass for cathode ray tube. Its composition contains (by mass percentage): 40-57% of SiO2, 2-8.5% of Na2O, 3.5-12% of K2O, 6-18% of sigma Na2O+K2O, 0-3.5% of MgO, 0.8-4.5% of CaO, 1-18% of SrO, 1-14% of Ba2O, 3-30% of sigma SrO+BaO, 0.5-4.5% of Al2O3, 0-2.5% of ZrO2, 0.5-6% of sigma Al2O3+ZrO2, 0-3% of ZnO, 0-2% of TiO2, 0-4% of sigma ZnO+TiO2, 5-25% of Bi2O3, 0-4.5% of WO3, 0-4% of MoO3 0-3% of Y2O3, 0-3% of Nb2O5, 0-3% of Ta2O5, 0.5-7% of sigma WO3+M0O3+Y2O3+Nb2O5+Ta2O5 and 0-0.8% of Sb2O3. said composition contains no PbO, the X-ray absorption coefficient at 0.6 angstrom wavelength is 65 cm(-1) or more than that, the average linear expansion coefficient at 20-380deg.C is 98-105X10 to the power-7k(-1).

Description

technical field [0001] The present invention relates to a kind of lead-free glass composition and tube cone glass for cathode ray tube, more specifically, relate to a kind of X-ray absorption coefficient at 0.6mm wavelength is 65cm -1 or above lead-free silicate glass composition and funnel glass for cathode ray tubes. Background technique [0002] X-rays are typically produced when fast-moving electrons collide with atoms in matter and are slowed or stopped. The radiation intensity of X-rays is related to the accelerating voltage, current and atomic number of the impacting material. [0003] The glass envelope (glass envelope) of a cathode ray tube CRT (Cathode-ray tube) includes a glass screen part for image display, a glass cone part and a tube neck part. The electron beam emitted by the electron gun excites the fluorescent substance on the inner surface of the screen part to emit light, so that the video image is projected on the screen part, and in this case, X-ray ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/095
Inventor 李留恩贾伟曹国喜苍利民
Owner HENAN ANCAI HI-TECH
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