Titanium-containing quartz glass having excellent UV absorption, and method for producing same
A titanium-quartz and glass technology, which is applied to titanium-containing quartz glass with excellent UV absorption and its production field, can solve the problems of increased defect rate, undetermined conditions, and it is no longer possible to obtain flake materials, and achieves high purity. , Excellent UV absorption effect
Pending Publication Date: 2021-11-09
SHIN ETABU QUARTZ PRODS +1
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AI Technical Summary
Problems solved by technology
[0003] However, these fused silica glasses have a problem in that they contain a large amount of air bubbles and inclusions caused by the material or doping method, and the defect rate increases due to the removal of air bubbles or inclusions during processing into a lamp shape or sheet shape, And it is no longer possible to obtain sheet material of the desired size
However, the examples of this document lack descriptions of the types and characteristics of the lamps used for evaluation, etc., and the conditions for obtaining the results of the examples and comparative examples cannot be determined
Method used
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Examples
Experimental program
Comparison scheme
Effect test
experiment example 1
[0232] Titanium-containing quartz glass was obtained by the same method as in Exemplary Example 1 except for the following steps, as shown in Table 5.
[0233] Introduce the porous quartz glass base material obtained after Step b into a sealed container, introduce nitrogen gas from the lower part of the container through a pipe, and keep the temperature in the oven at 300°C while making the nitrogen gas flow in such a way that from The upper pipe is discharged and heated for 10 hours, the purpose is to make the parent metal to the inside of the uniform heat. Afterwards, nitrogen was replaced with a mixed gas containing titanium tetrachloride (TiCl4) and nitrogen at a concentration ratio of 2%, and the material was kept at 1000° C. for 10 hours while the mixed gas also flowed from the bottom to the top of the vessel. For the same titanium concentration, the amount of titanium tetrachloride used needs to be about three times that of Exemplary Example 1.
[0234] The physical p...
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Abstract
Provided is a titanium-containing quartz glass having excellent UV absorption, wherein the quartz glass absorbs ultraviolet rays having a wavelength of 250 nm or less, ozone generation-related adverse effects on the human body, etc., are prevented, a decrease in transmittance of the quartz glass in the range from near-ultraviolet to visible light due to being colored when irradiated with ultraviolet rays does not occur, absorption build-up or lamp burst-inducing deformation build-up, which is caused by a structural change in the quartz glass that occurs in the range of 200-300 nm when irradiated with ultraviolet rays, is suppressed, and a decrease in transmittance at intended wavelength ranges does not occur even when exposed to ultraviolet rays. The titanium-containing quartz glass having excellent UV absorption is colorless, wherein the average concentration of titanium is 10-500 ppm, the concentration of OH group is 10-350 ppm, each elemental concentration of Al, Li, Na, K, Ca, Mg, Fe, Ni, Cu, Cr, Mo, and V is 50 ppb or less (150 ppb or less in total), and the concentration of chlorine is less than 30 ppm.
Description
technical field [0001] The present invention relates to titanium-containing quartz glass having excellent UV absorption and a method for producing the same, and more particularly, the present invention relates to UV-absorbing quartz glass used as a material for discharge tubes and high-intensity discharge lamps, which does not contain foreign matter or air bubbles, etc., and has high Purity, no decrease in transmittance due to UV irradiation occurs in the region from near ultraviolet light to visible light, and also suppresses the increase in strain, but has excellent UV absorption at shorter wavelengths; titanium-containing quartz glass, which is advantageous Used for UV blocking window materials and the like; and production methods thereof. Background technique [0002] In order to industrially use UV at the level of about 250nm to 300nm, quartz glass is doped with titanium in electric fusion or hydrogen-oxygen fusion of natural materials such as crystal powder, which is t...
Claims
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IPC IPC(8): C03B20/00C03C3/06
CPCC03C3/06C03C4/085C03C2201/23C03C2201/30C03B2201/07C03B2201/075C03B2201/23C03B2201/42C03B19/1461C03B19/1453C03C13/04C03B20/00C03B37/012C03B37/01262C03B37/014C03C2201/42C03B32/00C03C2203/54
Inventor 嶋田敦之折笠胜英田中信熊田智一樽川裕美
Owner SHIN ETABU QUARTZ PRODS