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

A technology of lead silicate glass and cathode ray tube, applied in the field of lead-free silicate glass composition and cone glass for cathode ray tube

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

AI Technical Summary

Problems solved by technology

Most of the existing CRT tube cone glass has an absorption coefficient of X-ray radiation at a wavelength of 0.3 Å less than 15cm -1

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

[0095] In practice, oxides are usually used to represent the composition of glass. In fact, oxides are just the external forms of introducing various atoms or ions into the glass. From the structure of oxide glass, glass-forming bulk ions (such as Si 4+ ) and O 2- The ions together constitute the two-dimensional or three-dimensional network structure of the glass, and other adjustment bulk cations (such as Na + , Ba 2+ etc.) are randomly and statistically filled in the network gap, so the glass can be regarded as a mixture of various anions and cations, and the X-ray absorption of the glass is actually the comprehensive absorption of all these ions. In view of this, it is reasonable to use the X-ray absorption properties of individual elements as the standard when examining the influence of composition on glass X-ray absorption.

[0096] The traditional CRT tube cone glass generally uses a lead silicate glass system containing alkali metal oxides and alkaline earth metal ox...

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Abstract

The present invention provides a leadless silicate glass composition with improved X-ray absorptivity and leadless funnel neck glass for cathode ray tube. Its composition contains: (by mass percentage) 42-55% of SiO2, 1-8% of Na2O, 2-10% of K2O, 4-17% of (Na2O+K2O), 0-3% of MgO, 0-4% of CaO, 1-12% of SrO, 5-18% of BaO, 6-26% of (SrO+BaO), 0.3-4% of Al2O3, 0-3% of ZrO2, 0.3-6% of (Al2O3+ZrO2), 0-3% of ZnO, 0-3% of TiO2, 0-3.5% of (ZnO+TiO2), 8-23% of Bi2O3, 0-4% of WO3, 0-8% of La2O3, 0-3% of TeO2, 0-5% of SnO2, 0-3% of In2O3, 0.5-12% of (La2O3+TeO2+SnO2+In2O3) and 0-0.7% of Sb2O3. Said composition contains no PbO, the x-ray absorption coefficient at 0.6 angstrom wavelength is 65cm(-1) or more than that, and the x-ray absorption coefficient at 0.3 angstrom wavelength is 15cm(-1) or more than that, and the average linear expansion coefficient at 20-380deg.C is 98-105X10 to the power-7K(-1).

Description

technical field [0001] The invention relates to a lead-free silicate glass composition and a tube funnel glass for a cathode ray tube, in particular to an X-ray absorption coefficient of 15 cm at a wavelength of 0.3 Å. -1 or above, with an X-ray absorption coefficient of 65 cm at a wavelength of 0.6 Å -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 bulb of a CRT (Cathode-ray tube) includes a glass screen part for image display, a glass funnel 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 scr...

Claims

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Application Information

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